Where the Wild Quahogs Are: Looking at Quahog Larval Supply and Distribution in the Upper Narragansett Bay presented at April 14th, 2014 Rhode Island Shellfish Management Plan Stakeholder meeting by Dale Leavitt, Matt Griffin, Scott Rutherford (RWU), and Chris Kincaid and Dave Ullman (URI).
Modern oil and gas field management is increasingly reliant on detailed and precise 3D reservoir characterisation, and timely areal monitoring. Borehole seismic techniques bridge the gap between remote surface-seismic observations and downhole reservoir evaluation: Borehole seismic data provide intrinsically higher-resolution, higher-fidelity images than surface-seismic data in the vicinity of the wellbore, and unique access to properties of seismic wavefields to enhance surface-seismic imaging. With the advent of new, operationally-efficient very large wireline receiver arrays; fiber-optic recording using Distributed Acoustic Sensing (DAS); the crosswell seismic reflection technique, and advanced seismic imaging algorithms such as Reverse Time Migration, a new wave of borehole seismic technologies is revolutionizing 3D seismic reservoir characterization and on-demand reservoir surveillance. New borehole seismic technologies are providing deeper insights into static reservoir architecture and properties, and into dynamic reservoir performance for conventional water-flood production, EOR, and CO2 sequestration – in deepwater, unconventional, full-field, and low-footprint environments. This lecture will begin by illustrating the wide range of borehole seismic solutions for reservoir characterization and monitoring, using a diverse set of current- and recent case study examples – through which the audience will gain an understanding of the appropriate use of borehole seismic techniques for field development and management. The lecture will then focus on DAS, explaining how the technique works; its capability to deliver conventional borehole seismic solutions (with key advantages over geophones); then describing DAS’s dramatic impact on field monitoring applications and business-critical decisions. New and enhanced borehole seismic techniques – especially with DAS time-lapse monitoring – are ready to deliver critical reservoir management solutions for your fields.
In these times of low oil and gas prices, the drive to provide 'more for less' has never been greater. One key component in achieving this is the ability to accurately monitor the production rates along a wellbore and across a reservoir. Ideally a range of different measurements should be available on-demand from all points in all wells. Clearly conventional sensors such as downhole pressure and temperature gauges, flow meters, geophone arrays and production logging tools can provide part of the solution but the cost of all these different sensors limits their widespread deployment. Fibre-optic Distributed Acoustic Sensing, or DAS for short, is changing that. Using an optical fibre deployed in a cable from surface to the toe of a well DAS, often in combination with fibre-optic Distributed Temperature Sensing (DTS), provides a means of acquiring high resolution seismic, acoustic and temperature data at all points in real-time. Since the first downhole demonstrations of DAS technology in 2009 there has been rapid progress in developing the technology and applications, to the point where today it is being used to monitor the efficiency of hydraulic fracture treatments, provides continuous flow profiling across the entire wellbore and is used as a uniquely capable tool for borehole seismic acquisition. With optical fibre installed in your wells and DAS acquiring data, there is now the ability to cost effectively and continuously monitor wells and reservoirs to manage them in real-time in order to optimise production.
Water Quality Presentation given by Angelo Liberti, Chief of Surface Water Protection, Office of Water Quality, RI DEM at the Shellfish Management Plan March Stakeholder meeting.
The primary funding for the Society of Petroleum Engineers Distinguished Lecturer Program is provided by member donations to The SPE Foundation and a contribution from Offshore Europe. The program also receives support from companies that allow their employees to serve as lecturers and from AIME. The January 2020 tour lecture focuses on thriving in a lower oil price environment, including topics such as market dynamics, keys to success, technology impacts, and takeaway points.
Microfracturing is an excellent method of obtaining direct stress measurements, not only in shales, but in conventional reservoirs as well. Recent advances have shown that microfracturing can help improve reservoir management by guiding well placement, completion design, and perforation strategy. Microfracturing consists of isolating small test intervals in a well between inflatable packers, increasing the pressure until a small fracture forms and then by conducting a few injection and shut-in cycles, extend the fracture beyond the influence of the wellbore. Results show that direct stress measurements can be successfully acquired at multiple intervals in a few hours and the vertical scale nearly corresponds to electric log resolution. Therefore, microfracture testing (generally performed in a pilot / vertical well) is an appropriate choice for calibrating log derived geomechanical models and obtaining a complete, accurate, and precise vertical stress profile. This talk describes the microfracturing process and presents several examples that led to increased hydrocarbon recovery by efficient stimulation and/or completion design. Case studies presented range from optimizing hydraulic fracturing in unconventionals, determining safe waterflood injection rates in brownfields, and improving perforation placement in ultra deepwater reservoirs.
Mayank Malik is the Global Formation Testing Expert in Chevron's Energy Technology Company and is a champion for advancing research on microfracturing. He holds a B.S. in Mechanical Engineering from Delhi College of Engineering (India), MS in Mechanical Engineering from University of Toronto (Canada), and Ph.D. in Petroleum Engineering from The University of Texas at Austin (USA). Malik has authored numerous papers on petrophysics, formation testing, and microfracturing. He is currently serving on the SPE ATCE Formation Evaluation committee and is also the Chairman for SPWLA Formation Testing Special Interest Group.
The current status of ASR Technology: Firming up Victoria's water supplyThe Texas Network, LLC
This document discusses the current status of Aquifer Storage and Recovery (ASR) technology. It provides an overview of ASR including its historical development and global implementation. Key points include that over 544 ASR wells exist across 133 wellfields in the US. The document discusses various water sources and aquifer types used for ASR storage. It also outlines several potential objectives for ASR systems, such as seasonal storage, emergency storage, and water quality improvement. Cost comparisons show ASR can be less expensive than other new water supply options. The remainder of the document discusses various ASR applications and case studies in more detail.
The document summarizes funding sources and support for the Society of Petroleum Engineers Distinguished Lecturer Program, which is primarily funded by member donations to The SPE Foundation and a contribution from Offshore Europe. Additional support comes from companies that allow employees to serve as lecturers and from AIME. The document then outlines the topics to be covered in a presentation on 4D seismic history matching.
Modern oil and gas field management is increasingly reliant on detailed and precise 3D reservoir characterisation, and timely areal monitoring. Borehole seismic techniques bridge the gap between remote surface-seismic observations and downhole reservoir evaluation: Borehole seismic data provide intrinsically higher-resolution, higher-fidelity images than surface-seismic data in the vicinity of the wellbore, and unique access to properties of seismic wavefields to enhance surface-seismic imaging. With the advent of new, operationally-efficient very large wireline receiver arrays; fiber-optic recording using Distributed Acoustic Sensing (DAS); the crosswell seismic reflection technique, and advanced seismic imaging algorithms such as Reverse Time Migration, a new wave of borehole seismic technologies is revolutionizing 3D seismic reservoir characterization and on-demand reservoir surveillance. New borehole seismic technologies are providing deeper insights into static reservoir architecture and properties, and into dynamic reservoir performance for conventional water-flood production, EOR, and CO2 sequestration – in deepwater, unconventional, full-field, and low-footprint environments. This lecture will begin by illustrating the wide range of borehole seismic solutions for reservoir characterization and monitoring, using a diverse set of current- and recent case study examples – through which the audience will gain an understanding of the appropriate use of borehole seismic techniques for field development and management. The lecture will then focus on DAS, explaining how the technique works; its capability to deliver conventional borehole seismic solutions (with key advantages over geophones); then describing DAS’s dramatic impact on field monitoring applications and business-critical decisions. New and enhanced borehole seismic techniques – especially with DAS time-lapse monitoring – are ready to deliver critical reservoir management solutions for your fields.
In these times of low oil and gas prices, the drive to provide 'more for less' has never been greater. One key component in achieving this is the ability to accurately monitor the production rates along a wellbore and across a reservoir. Ideally a range of different measurements should be available on-demand from all points in all wells. Clearly conventional sensors such as downhole pressure and temperature gauges, flow meters, geophone arrays and production logging tools can provide part of the solution but the cost of all these different sensors limits their widespread deployment. Fibre-optic Distributed Acoustic Sensing, or DAS for short, is changing that. Using an optical fibre deployed in a cable from surface to the toe of a well DAS, often in combination with fibre-optic Distributed Temperature Sensing (DTS), provides a means of acquiring high resolution seismic, acoustic and temperature data at all points in real-time. Since the first downhole demonstrations of DAS technology in 2009 there has been rapid progress in developing the technology and applications, to the point where today it is being used to monitor the efficiency of hydraulic fracture treatments, provides continuous flow profiling across the entire wellbore and is used as a uniquely capable tool for borehole seismic acquisition. With optical fibre installed in your wells and DAS acquiring data, there is now the ability to cost effectively and continuously monitor wells and reservoirs to manage them in real-time in order to optimise production.
Water Quality Presentation given by Angelo Liberti, Chief of Surface Water Protection, Office of Water Quality, RI DEM at the Shellfish Management Plan March Stakeholder meeting.
The primary funding for the Society of Petroleum Engineers Distinguished Lecturer Program is provided by member donations to The SPE Foundation and a contribution from Offshore Europe. The program also receives support from companies that allow their employees to serve as lecturers and from AIME. The January 2020 tour lecture focuses on thriving in a lower oil price environment, including topics such as market dynamics, keys to success, technology impacts, and takeaway points.
Microfracturing is an excellent method of obtaining direct stress measurements, not only in shales, but in conventional reservoirs as well. Recent advances have shown that microfracturing can help improve reservoir management by guiding well placement, completion design, and perforation strategy. Microfracturing consists of isolating small test intervals in a well between inflatable packers, increasing the pressure until a small fracture forms and then by conducting a few injection and shut-in cycles, extend the fracture beyond the influence of the wellbore. Results show that direct stress measurements can be successfully acquired at multiple intervals in a few hours and the vertical scale nearly corresponds to electric log resolution. Therefore, microfracture testing (generally performed in a pilot / vertical well) is an appropriate choice for calibrating log derived geomechanical models and obtaining a complete, accurate, and precise vertical stress profile. This talk describes the microfracturing process and presents several examples that led to increased hydrocarbon recovery by efficient stimulation and/or completion design. Case studies presented range from optimizing hydraulic fracturing in unconventionals, determining safe waterflood injection rates in brownfields, and improving perforation placement in ultra deepwater reservoirs.
Mayank Malik is the Global Formation Testing Expert in Chevron's Energy Technology Company and is a champion for advancing research on microfracturing. He holds a B.S. in Mechanical Engineering from Delhi College of Engineering (India), MS in Mechanical Engineering from University of Toronto (Canada), and Ph.D. in Petroleum Engineering from The University of Texas at Austin (USA). Malik has authored numerous papers on petrophysics, formation testing, and microfracturing. He is currently serving on the SPE ATCE Formation Evaluation committee and is also the Chairman for SPWLA Formation Testing Special Interest Group.
The current status of ASR Technology: Firming up Victoria's water supplyThe Texas Network, LLC
This document discusses the current status of Aquifer Storage and Recovery (ASR) technology. It provides an overview of ASR including its historical development and global implementation. Key points include that over 544 ASR wells exist across 133 wellfields in the US. The document discusses various water sources and aquifer types used for ASR storage. It also outlines several potential objectives for ASR systems, such as seasonal storage, emergency storage, and water quality improvement. Cost comparisons show ASR can be less expensive than other new water supply options. The remainder of the document discusses various ASR applications and case studies in more detail.
The document summarizes funding sources and support for the Society of Petroleum Engineers Distinguished Lecturer Program, which is primarily funded by member donations to The SPE Foundation and a contribution from Offshore Europe. Additional support comes from companies that allow employees to serve as lecturers and from AIME. The document then outlines the topics to be covered in a presentation on 4D seismic history matching.
Dannenbaum Engineering - River Update 9-19-2015law138
Chris Sallese, Special Projects, Dannenbaum Engineering presentation at the FOR Annual meeting regarding progress reopening the mouth of the San Bernard
The Distinguished Lecturer Program provides concise summaries of technical documents on facilities sand management. This summary covers a two-day course on the topic presented by Dr. Hank Rawlins, who has over 25 years of industry experience. The course covers the five key steps to managing sand in production facilities: separation, collection, cleaning, dewatering, and transport. It emphasizes understanding sand issues in facilities rather than focusing on specific equipment.
In order to determine a field’s hydrocarbon in place it is necessary to model the distribution of fluids throughout the reservoir. A water saturation vs. height (Swh) function provides this for the reservoir model. A good Swh function ensures the three independent sources of fluid distribution data are consistent. These being the core, formation pressure and electrical log data. The Swh function must be simple to apply, especially in reservoirs where it is difficult to map permeability or where there appears to be multiple contacts. It must accurately upscale the log and core derived water saturations to the reservoir model cell sizes.
This presentation clarifies the often misunderstood definitions for the free-water-level, transition zone and irreducible water saturation. Using capillary pressure theory and the concept of fractals, a practical Swh function is derived. Logs and core data from eleven fields, with very different porosity and permeability characteristics, depositional environments and geological age are compared. This study demonstrated how this Swh function is independent of permeability and litho-facies type and accurately describes the reservoir fluid distribution.
The shape of the Swh function shows that of the transition zone is related more to pore geometry rather than porosity or permeability alone. Consequently, this Swh function gives insights into a reservoir’s quality as determined by its pore architecture. A number of case studies are presented showing the excellent match between the function and well data. The function makes an accurate prediction of water saturations even in wells where the resistivity log was not run due to well conditions. The function defines the free water level, the hydrocarbon to water contact, net reservoir and the irreducible water saturation for the reservoir model. The fractal function provides a simple way to quality control electrical log and core data and justifies using core plug sized samples to model water saturations on the reservoir scale.
This document discusses the importance of contact area, conductivity, and connectivity in multi-fractured horizontal wells. It defines these terms and explains how they impact production over the life of a well. The document discusses factors that influence contact area, conductivity, and connectivity such as fracture spacing, proppant selection, and overflush volumes. It concludes that while contact area and conductivity have improved through more stages, clusters, and proppant, connectivity remains an underaddressed issue due to large overflush volumes.
Oil and gas are essential parts of a sustainable future. Though these are finite energy resources and sources of greenhouse gas emissions, the world continues to require their production. For this reason, it is imperative that we consider improved industry practices.
To begin, the audience will be presented with the most basic principles of sustainability pertaining to oil and gas operations, including SPE’s position on this matter. When oil is discovered at a location, decisions and guarantees cannot be made without considering the project’s life cycle. Our commitments must be demonstrated consistently along each stage of a project in direct consideration of a sustainable future.
Next, several case studies relating to sustainability, integrating the realities of the social license to operate and operations will be presented to the audience, detailing the required steps for the successful execution of any project facing challenging conditions.
The presentation will conclude by underlining that the inclusion of internal and external stakeholders will only enrich the project and, therefore, pave the road to success. It is our responsibility to create a culture of operational professionalism and reliability through active participation. In order to counterbalance the world’s energy demand, we must produce oil and gas while considering that the more efficiently the energy is produced, the more affordable the energy will be. The oil industry is not only committed to its own sustainability but also to the sustainability of our planet.
In 2010 Shell began investigating how to automate the initial response to a well control incident. The first phase of the project was to develop a rig system that could reliably detect an influx across a broad spectrum of floating rig well construction related rig operations. The results of a fault tree style sensitivity analysis pointed to the high value of improving sensor data quality (both accuracy and reliability) and the importance of improving kick detection software for alarming (both in terms of coverage and how the driller is alerted to respond to a confirmed kick condition). Based on the analysis results, a Smart Kick Detection System functional specification was developed and used to upgrade the kick detection system on an offshore rig.
Early in the project it was realized that focusing on adding robust kick detection during
connections was important but especially challenging due to the associated transient flow and pit volume signatures. A separate in-house initiative was therefore kicked-off to develop new software based on pattern recognition technology and machine learning. The resulting IDAPS (Influx Detection at Pumps Stopped) software has now been implemented as a real-time monitoring application for all Shell operated deep water wells. Further developments in smart kick detection are coming, ultimately leading to rigs being equipped with automated kick detection systems that are relied upon to detect a kick and secure the well in case the driller fails to act.
Iapg jornadas shale neuquén vaca muerta a regional vision- 2013 neuquénJuan Carlos Bonapace
The document summarizes Juan Carlos Bonapace's presentation on developing the Vaca Muerta shale play in the Neuquén Basin of Argentina. It discusses the reservoir properties including geology, geochemistry, mineralogy and petrophysics. It also covers laboratory analysis, hydraulic fracturing design considerations for different areas and hydrocarbon types, well completions methods, and production strategies. The overall goal is to provide an integrated approach to optimally develop the large unconventional resource potential of the Vaca Muerta formation.
Increasing interest by governments worldwide on reducing CO2 released into the atmosphere form a nexus of of opportunity with enhanced oil recovery which could benefit mature oil fields in nearly every country. Overall approximately two-thirds of original oil in place (OOIP) in mature conventional oil fields remains after primary or primary/secondary recovery efforts have taken place. CO2 enhanced oil recovery (CO2 EOR) has an excellent record of revitalizing these mature plays and can dramatically increase ultimate recovery. Since the first CO2 EOR project was initiated in 1972, more than 154 additional projects have been put into operation around the world and about two-thirds are located in the Permian basin and Gulf coast regions of the United States. While these regions have favorable geologic and reservoir conditions for CO2 EOR, they are also located near large natural sources of CO2.
In recent years an increasing number of projects have been developed in areas without natural supplies, and have instead utilized captured CO2 from a variety of anthropogenic sources including gas processing plants, ethanol plants, cement plants, and fertilizer plants. Today approximately 36% of active CO2 EOR projects utilize gas that would otherwise be vented to the atmosphere. Interest world-wide has increased, including projects in Canada, Brazil, Norway, Turkey, Trinidad, and more recently, and perhaps most significantly, in Saudi Arabia and Qatar. About 80% of all energy used in the world comes from fossil fuels, and many industrial and manufacturing processes generate CO2 that can be captured and used for EOR. In this 30 minute presentation a brief history of CO2 EOR is provided, implications for utilizing captured carbon are discussed, and a demonstration project is introduced with an overview of characterization, modeling, simulation, and monitoring actvities taking place during injection of more than a million metric tons (~19 Bcf) of anthropogenic CO2 into a mature waterflood.
Longer versions of the presentation can be requested and can cover details of geologic and seimic characterization, simulation studies, time-lapse monitoring, tracer studies, or other CO2 monitoring technologies.
Kevin Kraus, Saint Francis University Environmental Engineering Department, “...Michael Hewitt, GISP
Ancient technology that found its roots in the Catalan Forge in Spain, has seen a revival in recent years to treat acid mine drainage. This technology harnesses the power of hydraulics and hydrology by passively compressing air via the use of falling water, using no moving parts. A group of recently-graduated students from Saint Francis University have done extensive research in attempt to procure sizing guidance and parameters for the installation of this passive technology.
Mark Killar, Western Pennsylvania Conservancy, “Sewickley Creek Cost/Benefit ...Michael Hewitt, GISP
Throughout Pennsylvania, many non-profit organizations have developed restoration plans for AMD impaired watersheds. To secure federal AML funding through Pennsylvania’s Abandoned Mine Reclamation Program and with other federal programs, those plans must include a cost/benefits analysis to assure that funds from the program are spent wisely. In an effort to assist in the development of a cost/benefit analysis for AMD projects being proposed for a qualified hydrologic unit watershed, Western Pennsylvania Conservancy worked with Hedin Environmental, through a technical assistance grant provided by Trout Unlimited’s Eastern Abandoned Mines Program, to develop a treatment cost calculator, which could compare costs on a variety of AMD treatment types. This presentation will demonstrate how it was used to develop a cost/benefit analysis for priority AMD discharges within the Sewickley Creek watershed in Westmoreland County.
The Distinguished Lecturer Program is primarily funded by donations to the SPE Foundation and contributions from Offshore Europe. Additional support is provided by AIME. The program allows industry professionals to serve as lecturers. Martin Rylance will give a presentation called "The Fracts of Life" covering key aspects of geomechanics, formation permeability, fracturing, QA/QC, and the transition from vertical to horizontal wells.
The document discusses a presentation on controlling scale deposition in oil fields. Primary funding for the Society of Petroleum Engineers Distinguished Lecturer Program comes from member donations and contributions from industry partners. The presentation covers topics like scale types, prediction, inhibition strategies, case studies, and chemical quality control. Preventing scale before it starts to form is emphasized as the most cost-effective approach to dealing with scale formation in oil and gas production.
This document provides a summary of the accuracy of MERCATOR OCEAN's analyses and forecasts for the October-November-December 2010 period. It evaluates the global monitoring and forecasting systems, focusing on biases identified in surface layers of some regions. Modifications partially reduced biases in the Mediterranean Sea, while biases in other areas are still under investigation. The monitoring system matches altimetric observations well globally but has local biases that future updates aim to correct. Surface currents are underestimated compared to buoy measurements. Temperature and salinity forecasts show significant skill in many ocean regions from 0-500m depth.
Unconventional development propelled the United States to produce more oil than it imports for the first time in 20 years. Increased production of domestic oil and gas profoundly impacted economic growth and job creation for the U.S. During this evolution, there was a need to address environmental regulations and infrastructure requirements in order to access the sheer volume of resources. Combined with today’s horizontal drilling and hydraulic fracturing technology, a strategic development plan can be constructed for any country to create an unconventional energy opportunity. In this lecture, the experience from U.S development is utilized to provide a fully-integrated workflow for developing shale oil and gas reservoirs from exploitation to production. Starting at the nano-scale, we will zoom into the pore structure to understand the storage and flow paths. Transitioning to the reservoir-scale, well testing and microseismic are utilized to define the flow capacity and estimate the stimulated volume. Learnings from this subsurface characterization is used to guide well completion, flowback, and production operations. The diagnostic methodology specific to each operation can be applied to identify geologically favorable areas and the best completion practice. As development progresses, opportunities to improve recovery can be magnified through optimum well spacing and refracturing. As a final step in the development, determining an appropriate enhanced recovery method is essential to access the remaining resources. Finally, example development scenarios are provided to demonstrate how a technically driven strategy is more effective to maximize value and make the unconventional revolution a global one.
1) Researchers characterized riparian buffers and their sediment trapping efficiency in Goodwin Creek Watershed using the AnnAGNPS model under various buffer widths and concentrated flow path assumptions.
2) Results showed natural riparian vegetation reduced sediment yields, with yields of clay, silt, and sand all lower with buffers present.
3) Concentrated flow paths significantly reduced the sediment trapping efficiency of riparian buffers, indicating buffers need maintenance to prevent flow concentrations.
Adoption of the applied surface-backpressure types of managed pressure drilling (MPD) technologies in deepwater have mainly involved the use of a rotating control device (RCD). The RCD creates a closed drilling system in which the flow out of the well is diverted towards an automated MPD choke manifold (with a high-resolution mass flow meter) that aside from regulating backpressure also increases sensitivity and reduces reaction time to kicks, losses, and other unwanted drilling events. This integration of MPD equipment into floating drilling rigs to provide them with MPD capabilities, including the capacity to perform pressurized mud cap drilling (PMCD) and riser gas mitigation (RGM), has produced improvements not only in drillability and efficiency, but most importantly in process safety. Case histories on how MPD has performed will be presented on the following: • allowed drilling to reach target depth in rank wildcat deepwater wells that have formations prone to severe circulation losses and narrow mud weight windows; • increased drilling efficiency by minimizing non-productive time associated with downhole pressure-related problems and by allowing for the setting of deeper casing seats; • enhanced operational and process safety by allowing for immediate detection of kicks, losses and other critical downhole events. • provided riser gas mitigation capabilities that can detect a gas influx once it enters the drilling fluid stream, and not after it has already broken out above the rig blow-out preventers (BOPs).
The SPE Foundation and member donations primarily fund the SPE Distinguished Lecturer Program. Companies also support the program by allowing employees to serve as lecturers. Additional support comes from AIME. The program provides 30 minute presentations on reservoir topics. Robert Hawkes will present on hydraulic fracture flowback dynamics, discussing load fluid recovery and its implications for long term production. His presentation will cover laboratory observations, field data, and diagnostic tools to understand flowback mechanisms and estimate ultimate load fluid recovery.
The document discusses coiled tubing telemetry (CTT) technology. It provides an overview of CTT, including its description and benefits. It also presents four case histories that demonstrate how CTT improved coiled tubing operations by enabling real-time downhole data acquisition. CTT allowed operations to be completed more efficiently and safely by mitigating uncertainties in unknown downhole conditions. The case histories show that CTT can reduce operational time and costs for applications like logging, milling, perforating and camera runs. The document concludes that CTT will become commonly used for coiled tubing operations to make them less people intensive and more automated.
This document discusses the Society of Petroleum Engineers Distinguished Lecturer Program. It provides the following key details in 3 sentences:
The SPE Distinguished Lecturer Program is funded primarily by the SPE Foundation through member donations and Offshore Europe. It allows industry professionals to serve as lecturers on topics like CO2 storage and CO2-EOR. Additional support is provided by AIME to further the program's educational mission.
This document summarizes information about dengue, including that it is endemic in over 100 tropical and subtropical countries, infects around 100 million people annually, and has no specific treatment. It also provides details about the Philippines' National Dengue Prevention and Control Program, established in 1993 to reduce morbidity and mortality from dengue infection by preventing transmission between mosquitos and humans. The program aims to decrease incidence and case fatality rates while improving surveillance, reducing mosquito breeding sites, and increasing awareness of dengue fever and dengue hemorrhagic fever.
Ovitrap surveys for Aedes aegypti mosquito - V K Gunathilake, N K De Silva, W...Hiran Amarasekera
- The study surveyed Aedes aegypti and Aedes albopictus mosquitoes and their seasonal shifts at the University of Sri Jayewardenepura using ovitraps from May 2009 to November 2009.
- Aedes albopictus was the dominant species found both indoors and outdoors, with higher abundance outdoors. Its numbers increased with rainfall.
- Blocked drainage channels were a major breeding site. Containers like buckets and discarded plastics also contributed to breeding.
- Recommendations included maintaining drainage, removing containers and vegetation holding water, and targeted control from May to September to reduce dengue transmission.
Dannenbaum Engineering - River Update 9-19-2015law138
Chris Sallese, Special Projects, Dannenbaum Engineering presentation at the FOR Annual meeting regarding progress reopening the mouth of the San Bernard
The Distinguished Lecturer Program provides concise summaries of technical documents on facilities sand management. This summary covers a two-day course on the topic presented by Dr. Hank Rawlins, who has over 25 years of industry experience. The course covers the five key steps to managing sand in production facilities: separation, collection, cleaning, dewatering, and transport. It emphasizes understanding sand issues in facilities rather than focusing on specific equipment.
In order to determine a field’s hydrocarbon in place it is necessary to model the distribution of fluids throughout the reservoir. A water saturation vs. height (Swh) function provides this for the reservoir model. A good Swh function ensures the three independent sources of fluid distribution data are consistent. These being the core, formation pressure and electrical log data. The Swh function must be simple to apply, especially in reservoirs where it is difficult to map permeability or where there appears to be multiple contacts. It must accurately upscale the log and core derived water saturations to the reservoir model cell sizes.
This presentation clarifies the often misunderstood definitions for the free-water-level, transition zone and irreducible water saturation. Using capillary pressure theory and the concept of fractals, a practical Swh function is derived. Logs and core data from eleven fields, with very different porosity and permeability characteristics, depositional environments and geological age are compared. This study demonstrated how this Swh function is independent of permeability and litho-facies type and accurately describes the reservoir fluid distribution.
The shape of the Swh function shows that of the transition zone is related more to pore geometry rather than porosity or permeability alone. Consequently, this Swh function gives insights into a reservoir’s quality as determined by its pore architecture. A number of case studies are presented showing the excellent match between the function and well data. The function makes an accurate prediction of water saturations even in wells where the resistivity log was not run due to well conditions. The function defines the free water level, the hydrocarbon to water contact, net reservoir and the irreducible water saturation for the reservoir model. The fractal function provides a simple way to quality control electrical log and core data and justifies using core plug sized samples to model water saturations on the reservoir scale.
This document discusses the importance of contact area, conductivity, and connectivity in multi-fractured horizontal wells. It defines these terms and explains how they impact production over the life of a well. The document discusses factors that influence contact area, conductivity, and connectivity such as fracture spacing, proppant selection, and overflush volumes. It concludes that while contact area and conductivity have improved through more stages, clusters, and proppant, connectivity remains an underaddressed issue due to large overflush volumes.
Oil and gas are essential parts of a sustainable future. Though these are finite energy resources and sources of greenhouse gas emissions, the world continues to require their production. For this reason, it is imperative that we consider improved industry practices.
To begin, the audience will be presented with the most basic principles of sustainability pertaining to oil and gas operations, including SPE’s position on this matter. When oil is discovered at a location, decisions and guarantees cannot be made without considering the project’s life cycle. Our commitments must be demonstrated consistently along each stage of a project in direct consideration of a sustainable future.
Next, several case studies relating to sustainability, integrating the realities of the social license to operate and operations will be presented to the audience, detailing the required steps for the successful execution of any project facing challenging conditions.
The presentation will conclude by underlining that the inclusion of internal and external stakeholders will only enrich the project and, therefore, pave the road to success. It is our responsibility to create a culture of operational professionalism and reliability through active participation. In order to counterbalance the world’s energy demand, we must produce oil and gas while considering that the more efficiently the energy is produced, the more affordable the energy will be. The oil industry is not only committed to its own sustainability but also to the sustainability of our planet.
In 2010 Shell began investigating how to automate the initial response to a well control incident. The first phase of the project was to develop a rig system that could reliably detect an influx across a broad spectrum of floating rig well construction related rig operations. The results of a fault tree style sensitivity analysis pointed to the high value of improving sensor data quality (both accuracy and reliability) and the importance of improving kick detection software for alarming (both in terms of coverage and how the driller is alerted to respond to a confirmed kick condition). Based on the analysis results, a Smart Kick Detection System functional specification was developed and used to upgrade the kick detection system on an offshore rig.
Early in the project it was realized that focusing on adding robust kick detection during
connections was important but especially challenging due to the associated transient flow and pit volume signatures. A separate in-house initiative was therefore kicked-off to develop new software based on pattern recognition technology and machine learning. The resulting IDAPS (Influx Detection at Pumps Stopped) software has now been implemented as a real-time monitoring application for all Shell operated deep water wells. Further developments in smart kick detection are coming, ultimately leading to rigs being equipped with automated kick detection systems that are relied upon to detect a kick and secure the well in case the driller fails to act.
Iapg jornadas shale neuquén vaca muerta a regional vision- 2013 neuquénJuan Carlos Bonapace
The document summarizes Juan Carlos Bonapace's presentation on developing the Vaca Muerta shale play in the Neuquén Basin of Argentina. It discusses the reservoir properties including geology, geochemistry, mineralogy and petrophysics. It also covers laboratory analysis, hydraulic fracturing design considerations for different areas and hydrocarbon types, well completions methods, and production strategies. The overall goal is to provide an integrated approach to optimally develop the large unconventional resource potential of the Vaca Muerta formation.
Increasing interest by governments worldwide on reducing CO2 released into the atmosphere form a nexus of of opportunity with enhanced oil recovery which could benefit mature oil fields in nearly every country. Overall approximately two-thirds of original oil in place (OOIP) in mature conventional oil fields remains after primary or primary/secondary recovery efforts have taken place. CO2 enhanced oil recovery (CO2 EOR) has an excellent record of revitalizing these mature plays and can dramatically increase ultimate recovery. Since the first CO2 EOR project was initiated in 1972, more than 154 additional projects have been put into operation around the world and about two-thirds are located in the Permian basin and Gulf coast regions of the United States. While these regions have favorable geologic and reservoir conditions for CO2 EOR, they are also located near large natural sources of CO2.
In recent years an increasing number of projects have been developed in areas without natural supplies, and have instead utilized captured CO2 from a variety of anthropogenic sources including gas processing plants, ethanol plants, cement plants, and fertilizer plants. Today approximately 36% of active CO2 EOR projects utilize gas that would otherwise be vented to the atmosphere. Interest world-wide has increased, including projects in Canada, Brazil, Norway, Turkey, Trinidad, and more recently, and perhaps most significantly, in Saudi Arabia and Qatar. About 80% of all energy used in the world comes from fossil fuels, and many industrial and manufacturing processes generate CO2 that can be captured and used for EOR. In this 30 minute presentation a brief history of CO2 EOR is provided, implications for utilizing captured carbon are discussed, and a demonstration project is introduced with an overview of characterization, modeling, simulation, and monitoring actvities taking place during injection of more than a million metric tons (~19 Bcf) of anthropogenic CO2 into a mature waterflood.
Longer versions of the presentation can be requested and can cover details of geologic and seimic characterization, simulation studies, time-lapse monitoring, tracer studies, or other CO2 monitoring technologies.
Kevin Kraus, Saint Francis University Environmental Engineering Department, “...Michael Hewitt, GISP
Ancient technology that found its roots in the Catalan Forge in Spain, has seen a revival in recent years to treat acid mine drainage. This technology harnesses the power of hydraulics and hydrology by passively compressing air via the use of falling water, using no moving parts. A group of recently-graduated students from Saint Francis University have done extensive research in attempt to procure sizing guidance and parameters for the installation of this passive technology.
Mark Killar, Western Pennsylvania Conservancy, “Sewickley Creek Cost/Benefit ...Michael Hewitt, GISP
Throughout Pennsylvania, many non-profit organizations have developed restoration plans for AMD impaired watersheds. To secure federal AML funding through Pennsylvania’s Abandoned Mine Reclamation Program and with other federal programs, those plans must include a cost/benefits analysis to assure that funds from the program are spent wisely. In an effort to assist in the development of a cost/benefit analysis for AMD projects being proposed for a qualified hydrologic unit watershed, Western Pennsylvania Conservancy worked with Hedin Environmental, through a technical assistance grant provided by Trout Unlimited’s Eastern Abandoned Mines Program, to develop a treatment cost calculator, which could compare costs on a variety of AMD treatment types. This presentation will demonstrate how it was used to develop a cost/benefit analysis for priority AMD discharges within the Sewickley Creek watershed in Westmoreland County.
The Distinguished Lecturer Program is primarily funded by donations to the SPE Foundation and contributions from Offshore Europe. Additional support is provided by AIME. The program allows industry professionals to serve as lecturers. Martin Rylance will give a presentation called "The Fracts of Life" covering key aspects of geomechanics, formation permeability, fracturing, QA/QC, and the transition from vertical to horizontal wells.
The document discusses a presentation on controlling scale deposition in oil fields. Primary funding for the Society of Petroleum Engineers Distinguished Lecturer Program comes from member donations and contributions from industry partners. The presentation covers topics like scale types, prediction, inhibition strategies, case studies, and chemical quality control. Preventing scale before it starts to form is emphasized as the most cost-effective approach to dealing with scale formation in oil and gas production.
This document provides a summary of the accuracy of MERCATOR OCEAN's analyses and forecasts for the October-November-December 2010 period. It evaluates the global monitoring and forecasting systems, focusing on biases identified in surface layers of some regions. Modifications partially reduced biases in the Mediterranean Sea, while biases in other areas are still under investigation. The monitoring system matches altimetric observations well globally but has local biases that future updates aim to correct. Surface currents are underestimated compared to buoy measurements. Temperature and salinity forecasts show significant skill in many ocean regions from 0-500m depth.
Unconventional development propelled the United States to produce more oil than it imports for the first time in 20 years. Increased production of domestic oil and gas profoundly impacted economic growth and job creation for the U.S. During this evolution, there was a need to address environmental regulations and infrastructure requirements in order to access the sheer volume of resources. Combined with today’s horizontal drilling and hydraulic fracturing technology, a strategic development plan can be constructed for any country to create an unconventional energy opportunity. In this lecture, the experience from U.S development is utilized to provide a fully-integrated workflow for developing shale oil and gas reservoirs from exploitation to production. Starting at the nano-scale, we will zoom into the pore structure to understand the storage and flow paths. Transitioning to the reservoir-scale, well testing and microseismic are utilized to define the flow capacity and estimate the stimulated volume. Learnings from this subsurface characterization is used to guide well completion, flowback, and production operations. The diagnostic methodology specific to each operation can be applied to identify geologically favorable areas and the best completion practice. As development progresses, opportunities to improve recovery can be magnified through optimum well spacing and refracturing. As a final step in the development, determining an appropriate enhanced recovery method is essential to access the remaining resources. Finally, example development scenarios are provided to demonstrate how a technically driven strategy is more effective to maximize value and make the unconventional revolution a global one.
1) Researchers characterized riparian buffers and their sediment trapping efficiency in Goodwin Creek Watershed using the AnnAGNPS model under various buffer widths and concentrated flow path assumptions.
2) Results showed natural riparian vegetation reduced sediment yields, with yields of clay, silt, and sand all lower with buffers present.
3) Concentrated flow paths significantly reduced the sediment trapping efficiency of riparian buffers, indicating buffers need maintenance to prevent flow concentrations.
Adoption of the applied surface-backpressure types of managed pressure drilling (MPD) technologies in deepwater have mainly involved the use of a rotating control device (RCD). The RCD creates a closed drilling system in which the flow out of the well is diverted towards an automated MPD choke manifold (with a high-resolution mass flow meter) that aside from regulating backpressure also increases sensitivity and reduces reaction time to kicks, losses, and other unwanted drilling events. This integration of MPD equipment into floating drilling rigs to provide them with MPD capabilities, including the capacity to perform pressurized mud cap drilling (PMCD) and riser gas mitigation (RGM), has produced improvements not only in drillability and efficiency, but most importantly in process safety. Case histories on how MPD has performed will be presented on the following: • allowed drilling to reach target depth in rank wildcat deepwater wells that have formations prone to severe circulation losses and narrow mud weight windows; • increased drilling efficiency by minimizing non-productive time associated with downhole pressure-related problems and by allowing for the setting of deeper casing seats; • enhanced operational and process safety by allowing for immediate detection of kicks, losses and other critical downhole events. • provided riser gas mitigation capabilities that can detect a gas influx once it enters the drilling fluid stream, and not after it has already broken out above the rig blow-out preventers (BOPs).
The SPE Foundation and member donations primarily fund the SPE Distinguished Lecturer Program. Companies also support the program by allowing employees to serve as lecturers. Additional support comes from AIME. The program provides 30 minute presentations on reservoir topics. Robert Hawkes will present on hydraulic fracture flowback dynamics, discussing load fluid recovery and its implications for long term production. His presentation will cover laboratory observations, field data, and diagnostic tools to understand flowback mechanisms and estimate ultimate load fluid recovery.
The document discusses coiled tubing telemetry (CTT) technology. It provides an overview of CTT, including its description and benefits. It also presents four case histories that demonstrate how CTT improved coiled tubing operations by enabling real-time downhole data acquisition. CTT allowed operations to be completed more efficiently and safely by mitigating uncertainties in unknown downhole conditions. The case histories show that CTT can reduce operational time and costs for applications like logging, milling, perforating and camera runs. The document concludes that CTT will become commonly used for coiled tubing operations to make them less people intensive and more automated.
This document discusses the Society of Petroleum Engineers Distinguished Lecturer Program. It provides the following key details in 3 sentences:
The SPE Distinguished Lecturer Program is funded primarily by the SPE Foundation through member donations and Offshore Europe. It allows industry professionals to serve as lecturers on topics like CO2 storage and CO2-EOR. Additional support is provided by AIME to further the program's educational mission.
This document summarizes information about dengue, including that it is endemic in over 100 tropical and subtropical countries, infects around 100 million people annually, and has no specific treatment. It also provides details about the Philippines' National Dengue Prevention and Control Program, established in 1993 to reduce morbidity and mortality from dengue infection by preventing transmission between mosquitos and humans. The program aims to decrease incidence and case fatality rates while improving surveillance, reducing mosquito breeding sites, and increasing awareness of dengue fever and dengue hemorrhagic fever.
Ovitrap surveys for Aedes aegypti mosquito - V K Gunathilake, N K De Silva, W...Hiran Amarasekera
- The study surveyed Aedes aegypti and Aedes albopictus mosquitoes and their seasonal shifts at the University of Sri Jayewardenepura using ovitraps from May 2009 to November 2009.
- Aedes albopictus was the dominant species found both indoors and outdoors, with higher abundance outdoors. Its numbers increased with rainfall.
- Blocked drainage channels were a major breeding site. Containers like buckets and discarded plastics also contributed to breeding.
- Recommendations included maintaining drainage, removing containers and vegetation holding water, and targeted control from May to September to reduce dengue transmission.
Dengue fever is caused by a virus transmitted by the Aedes mosquito. It is a common and potentially fatal mosquito-borne illness. The female Aedes mosquito bites during the day and lays eggs in clean, stagnant water, where its life cycle continues. To prevent transmission, individuals should remove all sources of stagnant water to prevent Aedes breeding and go on "mozzie wipe out exercises." Proper precautions when away from home, such as covering drains and containers, can also help prevent breeding.
6 Mosquitoes, Their Life Cycle And Larval HabitatsGDPH
The document summarizes the life cycle and larval habitats of mosquitoes. It discusses that mosquitoes undergo complete metamorphosis, hatching from eggs laid in water into larvae called "wigglers", then transforming into non-feeding pupae before emerging as adult mosquitoes. Both male and female mosquitoes feed on plant nectar, but female mosquitoes require a blood meal to develop eggs. The best way to control mosquitoes is to target their larval habitats, which can be found in any standing water, both natural and man-made. Common larval habitats include ditches, woodland pools, artificial containers like tires and buckets.
This document discusses various methods for controlling the spread of dengue, including larvicides, adulticides, and environmental management. Larvicides like Bacillus thuringiensis israelensis and temephos can prevent mosquito larvae from maturing. Adulticides like malathion and pyrethroid insecticides are applied by air or ground to combat outbreaks. Environmental management focuses on improving water supply and waste disposal. Surveillance and source reduction are also important to reduce mosquito breeding sites and lower transmission risks.
Vector surveillance involves the ongoing collection, analysis, and dissemination of mosquito data to inform appropriate public health actions. The key objectives are to monitor mosquito populations and breeding sites to determine infection risk levels and recommend prevention/control measures. Common surveillance methods include adult mosquito collection, pupal surveys, larval surveys, and ovitrapping. Larval surveys inspect water containers to calculate larval indices like House Index, Container Index, and Breteau Index. Analysis of findings considers vector characteristics, community factors, and prioritizes areas for intervention and monitoring based on mosquito density levels. The information benefits various stakeholders for public health decision-making and research.
Integrating sediment dynamics into habitat mapping approaches using sediment ...Siddhi Joshi
Joshi, Siddhi. (2022). Integrating sediment dynamics into habitat mapping approaches using sediment mobility indices and seabed classification in Galway Bay, Ireland.
https://lnkd.in/e9vHBu8v
This document summarizes a geochemical analysis of the Torok Formation in Slope Mountain, Alaska. Samples were collected from two locations, SM1 and SM2, and analyzed using XRD and XRF techniques to determine changing depositional conditions. Correlations between the sites were identified by matching uranium and organic material peaks. Enrichment factors showed uranium, vanadium, and nickel accumulated at similar rates, indicating an oxic-suboxic depositional environment. Correlations between enrichment factors and organic content further supported this depositional interpretation.
DSD-INT 2015 - The future of computer modeling of coastal wetland, estuarine,...Deltares
The document summarizes a modeling project to simulate coastal wetland, estuarine, and riverine systems in Louisiana. It involved a team effort between multiple organizations. The goal was to develop a validated model to simulate morphological processes during new delta and wetland creation, as well as nutrient effects on vegetation and primary producers. The modeling approach coupled hydrodynamic, morphodynamic, and nutrient dynamic modules. Nine production runs were planned using different scenarios of sediment diversion operations and environmental conditions over 50 years. Model calibration and validation showed good performance in simulating river hydrology and morphology change. The scenarios suggested that operating multiple sediment diversions could significantly build land compared to no diversions.
DSD-INT 2015 - Ecologic and morphologic analysis in the Mississippi delta mod...Deltares
The document summarizes a modeling project to simulate coastal wetland, estuarine, and riverine systems in Louisiana. It involved a team effort between multiple organizations. The goal was to develop a validated model to simulate morphological processes during new delta and wetland creation, as well as nutrient effects on vegetation and primary producers. The modeling approach coupled hydrodynamic, morphodynamic, and nutrient dynamic modules. Nine production runs were planned using different diversion operating plans and scenarios to assess restoration strategy performance. Model calibration and validation showed good agreement with observed river stage, flow, sediment transport, and wetland accretion rates.
The document summarizes a study on water quality monitoring in Bayou Chene and Lacassine Bayou in Louisiana. The objectives were to assess spatial and seasonal variability of surface water quality, identify factors associated with variability, assess trends, and understand relationships between water quality and fish/macroinvertebrates. Water quality parameters like temperature, dissolved oxygen, turbidity, nutrients and metals were measured weekly at 15 sites over 3 years. Results showed significant spatial variability in parameters between sites. Seasonal variability was also observed with higher turbidity during rainy seasons. Principal component analysis identified turbidity as the main factor associated with surface water quality variability.
This document provides guidance on sediment transport measurements and sediment data collection. It discusses the origin and transport of sediments, network design considerations, site selection criteria, measuring frequency, techniques for suspended sediment and bed material measurements, equipment specifications, and station design and installation. Key topics covered include definitions of sediment load types, factors affecting erosion and sediment yield, sediment transport equations, suspended sediment measurement methods, bed material sampling techniques, and specifications for suspended sediment and bed material sampling equipment. The overall aim is to establish standard procedures for collecting sediment data as part of a hydrological information system.
This document provides information on sediment transport measurements, including definitions, the origin and transport of sediments, network design considerations, site selection, measuring frequency, techniques, equipment specifications, and station design. It contains detailed information on measuring suspended and bed load sediments, including sampling procedures, equipment, and analysis methods. The overall aim is to establish standardized procedures for collecting sediment data within India's Hydrological Information System to better understand sediment processes and support water resource planning and design projects.
This document provides information on sediment transport measurements, including definitions, the origin and transport of sediments, network design considerations, site selection, measuring frequency, techniques, equipment specifications, and station design. It contains detailed information on measuring suspended and bed load sediments, including sampling procedures, equipment, and analysis methods. The overall aim is to establish standardized procedures for collecting sediment data within India's Hydrological Information System.
Surface Water Sheen Chracterization Sampling and AnalysisAntea Group
Take a closer look at surface water sheen evaluation, including sheen classifications, methods and resources, why analysis is important, and a case study.
For more information, see http://us.anteagroup.com/en-us/services/environmental-liability-management/napl-management
DSD-INT 2015 - The future of computer modeling of coastal wetland - maselheDeltares
The document summarizes the modeling approach and results of a team effort to develop an integrated modeling system for coastal Louisiana. The team used several models linked together to simulate hydrodynamics, morphodynamics, nutrient dynamics, and vegetation changes over long time periods. Validation showed the models reasonably represented water levels, salinity, sediment changes and more. Production runs examined scenarios with and without sediment diversions. The diversions led to increased land building and changes in water quality and vegetation over 50 years. The modeling effort aimed to improve understanding of coastal processes and inform restoration planning.
The document summarizes research on detecting and predicting locations of illegal oil discharges from vessels off Canada's Pacific coast. It finds spatial autocorrelation between detected oil spills and marine traffic densities of different vessel types through statistical analysis. Based on these results, it proposes using spatially autoregressive and geographically weighted regression models to predict locations of illegal oil discharges based on vessel movement patterns and surveillance efforts, in order to help transportation authorities better target their monitoring programs.
468 samples of metasedimentary rock from across Cornwall were analyzed to determine baseline geochemistry. The samples were crushed and analyzed for 40 elements using ICP-MS. This resulted in a database of over 19,000 records that can be used to study metasediment mineralogy and provenance, aid geochemical mapping, and provide context for studies of metal transport and pollution modeling. Most samples came from the Gramscatho, Looe, South Devon, and Tavy Basins and were classified as mudstones, siltstones, or sandstones.
The document analyzes the feasibility of using a barge versus a semi-submersible landing platform for recovering rocket parts offshore Cape Canaveral, Florida. It finds that a barge is currently used but has workability issues during winter months due to wave interactions with its resonant modes. In contrast, a semi-submersible platform with resonant modes outside typical wave periods could increase landing chances by up to 25% and significantly reduce winter downtime. Environmental data for the site shows greatest workability from May to August, with the poorest in winter and hurricane seasons.
Petrophysical analysis of reservoir rock of kadanwari gas [autosaved]muhammad ali
This document summarizes a petrophysical analysis of reservoir rock in the Kadanwari block. It outlines the objectives, methodology, and results of the analysis using well logs from four wells. Key findings include identifying eight hydrocarbon-bearing zones, calculating properties like porosity, water saturation, and net pay thickness. Maps of properties like shale distribution and porosity variation show lateral changes across the reservoir. The analysis provides reliable petrophysical data for evaluating this gas reservoir.
Petrophysical Analysis Of Reservoir Rock Of Kadanwari Gas [Autosaved]muhammad ali
This document outlines a petrophysical analysis of reservoir rock in the Kadanwari block. It includes an introduction, objectives, methodology, and results from analyzing well logs from four wells in the block. The analysis identified lithology, calculated shale volume, porosity, water saturation, hydrocarbon saturation, and net pay thickness. Maps were generated showing spatial variations in properties like shale content, porosity, water saturation, and net pay across the reservoir. The analysis concluded the sonic log provided reliable porosity calculations due to borehole irregularities affecting density and neutron logs. Water saturation was effectively calculated using the Indonesia model for the heterogeneous shaly sand reservoirs.
The Geomorphology of Dunes Along the Western Shoreline of Lake Michigan: Diss...SERC at Carleton College
This document summarizes research on the geomorphology of dunes along the western shoreline of Lake Michigan. It describes the study areas around Clark Lake, Kangaroo Lake, and Europe Lake, including dune sizes and spacing. Methods used in the research are outlined, such as the use of LiDAR, ground penetrating radar, particle size analysis, and optically stimulated luminescence dating. Optical dating results from samples are presented. The document discusses disseminating the findings in the classroom and provides potential assignment topics.
Modelling of aquaculture impact and carrying capacity in the Philippines usin...Patrick White
Modelling of the SABBAC zones has the following objectives:
• to test scenarios which encourage careful feeding, so waste feed and nutrient input to
the environment is minimised; farmers will also save money
• to encourage use of better quality feed, where better digestibility of feed means less
feed is needed; better quality feed also breaks up less, so more goes to growth
The modelling approach also aims to:
• maintain enough spacing between cage rows so that remediation of sediments can
take place – impact should be low between rows in each zone
• maintain enough space between cage rows to prevent reduction of currents by high
aggregation of cages – although not predicted by TROPOMOD, this effect is known
to exist and has been shown by MSI models
• prevent overlap of zones by predicting the extent of the zones and recommending
minimum spacing between zones
The TROPOMOD model was therefore set up to evaluate the following:
• How severe is the impact – what is the maximum impact underneath cages?
• How far to the boundary of the impact?
• How can husbandry practices be optimised to use the zone most productively?
The document summarizes research investigating sediment bypassing rates around submarine canyons along the Santa Barbara Littoral Cell coast. The research aims to determine the quantity of littoral drift that bypasses canyons versus the amount captured by modeling hydrodynamics and sediment transport. The methodology includes setting up a 2D hydrodynamic model of the region forced by simplified tidal and wave conditions. Multiple model runs are performed with different wave conditions to analyze residual currents and longshore sediment transport rates with and without canyons.
1) A rapid field investigation was conducted in June 2015 on flooding in the Rajang Delta region of Sarawak, Malaysia.
2) Field measurements and observations were made on water levels, peat depths, groundwater levels, and impacts on oil palm plantations.
3) Preliminary results found flooding in riverine areas up to 1.5m for over 10 days, subsidence of peatlands up to 1.6m, and impacts on oil palm including leaning, exposed roots, and reduced productivity in flood-prone and unhealthy areas.
Similar to Where the Wild Quahogs Are: Looking at Quahog Larval Supply and Distribution in the Upper Narragansett Bay (20)
2015 International Spatial Planning Symposium: Sharing Practical Solutions riseagrant
The document summarizes findings from a review of marine spatial plans around the world. It finds that most plans are implemented at smaller spatial scales than entire ecosystems. It also finds that few institutional changes are made to governing bodies to implement coastal and marine spatial planning, relying instead on existing agencies. Additionally, it notes that while formal decision support tools are used, informal expert judgment also plays a role. The main messages are that there is no single approach for marine spatial planning and that the value is in the planning process of engaging stakeholders as much as the final plan.
Five regional planning bodies have been established across the United States to coordinate ocean planning: the Northeast, Mid-Atlantic, Pacific Islands, Caribbean, and West Coast. The Northeast and Mid-Atlantic regions have established charters and are drafting regional marine plans to be completed in 2016. The Pacific Islands has a charter and is beginning to draft a plan, while the Caribbean is still finalizing its charter and the West Coast is working on one.
This document assessed the impact of past ocean management plans in several countries and U.S. states. It found that the plans supported $4.1 billion in ocean economies by siting wind farms and retaining existing industries. The plans also generated hundreds of millions of dollars annually in economic gains for new industries like wind power and retained billions within existing industries like fishing and tourism. While fishermen lost some access, they were compensated. The plans encouraged collaboration among stakeholders and expanded environmental protections over 50% of the planned areas while managing industrial growth. Future research on newer plans is needed to fully understand the long-term economic, environmental and social impacts of comprehensive ocean management.
The Block Island Wind Farm project will consist of 5 turbines generating 30 MW of energy, enough for 17,000 homes. Construction is underway and commercial operations are scheduled for 2016. The project has completed permitting, engineering, and financing. It will create over 300 construction jobs and establish a new cable to the mainland, positioning the US for national leadership in offshore wind.
This document provides a tutorial for using STORMTOOLS, a web-based mapping tool for understanding coastal flood risk in Rhode Island. It outlines how to access and use the various features and layers in STORMTOOLS to determine flood depths and impacts under different hurricane and sea level rise scenarios. Key features include zooming and panning the map, adjusting layer transparency, toggling layers on and off, and clicking on locations to view flood depths and identify emergency services. The tutorial is created by a team from the University of Rhode Island and the Rhode Island Coastal Resources Management Council.
Shoreline Change Special Area Management Plan (Beach SAMP) Stakeholder Meeting. Held on July 14, 2015. The purpose of the meeting was to review progress to date on development of tools, and discuss the next phase of the Beach SAMP porject.
Legal and Policy Strategies for SLAMM in Rhode Islandriseagrant
This document discusses potential legal and policy strategies for addressing sea level rise and marsh migration in Rhode Island. It examines transferred development rights and rolling easements as adaptive tools, noting that the strategies were researched by Sea Grant Law Fellows to help inform the SLAMM and Beach SAMP teams. The Beach SAMP process will further explore using these strategies as well as property rights and liability issues related to climate change impacts.
This document summarizes coastal wetland adaptation strategies presented at two municipal workshops in October 2014. The strategies included upland actions like facilitating marsh migration and removing barriers, as well as in-marsh actions like drainage improvements, elevation enhancement, and erosion control. Specific project examples were provided from locations around Rhode Island where marsh migration was being facilitated or impeded, and adaptation techniques like creek excavation and land protection were undertaken. Partnerships between municipalities, land trusts, and state agencies were noted as important for implementing projects costing $5,000 to $15,000 each to adapt coastal marshes to sea level rise.
Sea Level Rise & the Conservation of Wetlands: Issues and Opportunities for C...riseagrant
1) The document discusses how municipalities in Rhode Island can incorporate projections of sea level rise and coastal flooding from the SLAMM (Sea Level Affecting Marshes Model) into their local comprehensive plans and policies.
2) It provides examples of how North Kingstown used SLAMM maps and data to update hazard mitigation and adaptation strategies in their comprehensive plan.
3) The document outlines challenges municipalities may face in planning for sea level rise and adapting infrastructure, and compares approaches some other states have taken through regulations and designated planning areas.
This document summarizes several local case studies on coastal communities in Rhode Island that are vulnerable to sea level rise. It describes modeling of 1 foot, 3 foot, and 5 foot sea level rise scenarios for the communities of Jamestown, Barrington/Warren, and Charlestown. For each community, the document identifies current land uses and infrastructure that are at risk of flooding and inundation. It also provides potential issues and opportunities to address the impacts of sea level rise through actions such as elevating roads, relocating facilities, protecting undeveloped lands, and coordinating land management between stakeholders.
Sea Level Affecting Marshes Model (SLAMM)riseagrant
The Sea Level Affecting Marshes Model (SLAMM) simulates wetland conversions during sea level rise. It has been applied and improved since 1985 and used worldwide. The document describes how SLAMM models elevation, vegetation zones, accretion rates, and other parameters to project wetland impacts from sea level rise under various scenarios. It also notes limitations such as uncertainty in sea level projections and complexity of ground conditions and coastal dynamics.
Sea Levels Affecting Marshes Model Using SLAMM to Conserve Rhode Island’s Coa...riseagrant
This document summarizes information presented at a workshop on using the Sea Level Affecting Marshes Model (SLAMM) to project impacts of sea level rise on coastal wetlands in Rhode Island. Key points include:
- Tidal marshes provide important ecosystem services like habitat, water filtration, and flood protection. Rhode Island has lost over 50% of its historic salt marshes.
- Sea levels are rising faster in Rhode Island due to climate change, increasing the risk of wetland loss and property damage from flooding. The SLAMM model projects significant wetland loss under scenarios of 1, 3, and 5 feet of sea level rise.
- The SLAMM projections will help identify vulnerable wetlands and
RI Shoreline Change Special Area Management Planriseagrant
This document discusses planning for sea level rise in Rhode Island. It provides past, present and projected future rates of sea level rise. It identifies potential impacts of sea level rise such as erosion, overwash, wetland loss, and infrastructure failure. Maps show examples of projected inundation in Newport Harbor from 5 feet of sea level rise. The document outlines studies and data being collected on erosion rates, sediment transport, inundation mapping, and economic impacts. It discusses developing policy recommendations, education materials, and adaptation guidelines for municipalities. Products under development include updated erosion maps, economic analyses, and identification of at-risk infrastructure. The goal is to provide cities and towns with tools and lessons from other areas to help plan for and
STORMTOOLS* -Simplified Flood Inundation Maps for RI with Sea Level Rise (SLR)riseagrant
Malcolm L. Spaulding1
Chris Damon2
1Professor Emeritus, Ocean Engineering
2Environmental Data Center
University of RI
December 9, 2014
*http://www.beachsamp.org/research/stormtools/
Narragansett, RI
Key Tools for Businesses
Overview of tools and resources that can help businesses address priority resilience issues. Fortified Commercial ™ – Chuck Miccolis, Insurance Institute for Business and Home Safety
Lessons from Sandy and Green Infrastructure Strategies riseagrant
Hoboken, New Jersey—Lessons from Sandy and Green Infrastructure Strategy. How to prepare for the next storm and be creative with flood control. Presented by Stephen Marks, City of Hoboken
Key Tools for Businesses: An overview of tools and resources that can help businesses address priority resilience issues. Resilience Green Infrastructure presented by James Houle, Stormwater Center, University of New Hampshire.
Gulf of Mexico Alliance Resilient Marina Checklistriseagrant
Key Tools for Businesses: An overview of tools and resources that can help businesses address priority resilience issues. Resilience Checklist presented by Lauren Land, Louisiana Sea Grant College Program
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...EduSkills OECD
Andreas Schleicher, Director of Education and Skills at the OECD presents at the launch of PISA 2022 Volume III - Creative Minds, Creative Schools on 18 June 2024.
Gender and Mental Health - Counselling and Family Therapy Applications and In...PsychoTech Services
A proprietary approach developed by bringing together the best of learning theories from Psychology, design principles from the world of visualization, and pedagogical methods from over a decade of training experience, that enables you to: Learn better, faster!
Temple of Asclepius in Thrace. Excavation resultsKrassimira Luka
The temple and the sanctuary around were dedicated to Asklepios Zmidrenus. This name has been known since 1875 when an inscription dedicated to him was discovered in Rome. The inscription is dated in 227 AD and was left by soldiers originating from the city of Philippopolis (modern Plovdiv).
Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.pptHenry Hollis
The History of NZ 1870-1900.
Making of a Nation.
From the NZ Wars to Liberals,
Richard Seddon, George Grey,
Social Laboratory, New Zealand,
Confiscations, Kotahitanga, Kingitanga, Parliament, Suffrage, Repudiation, Economic Change, Agriculture, Gold Mining, Timber, Flax, Sheep, Dairying,
Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.ppt
Where the Wild Quahogs Are: Looking at Quahog Larval Supply and Distribution in the Upper Narragansett Bay
1. Where the Wild Quahogs Are: Looking at Quahog Larval Supply
and Distribution in the Upper Narragansett Bay
Dale Leavitt, Matt Griffin & Scott Rutherford – RWU
Chris Kincaid & Dave Ullman – URI
2. An Assessment of Quahog Larval Supply and Distribution in the
Upper Narragansett Bay with a Focus on Spawning Sanctuaries
and Alternative Area Management Strategies
Dale Leavitt, Matt Griffin & Scott Rutherford – RWU
Chris Kincaid & Dave Ullman – URI
3. The Big Picture
• Often thought that the quahog
supply in NarBay originated in
the Providence River and
upper bay.
• Research effort originated with
discussions among CFRF, RISA,
RWU and DEM Marine
Fisheries (2010)
• With increased fishing
pressure in Areas A & B
(resulting from, NBC’s CSO
Project) and Greenwich Bay –
how would that affect quahog
resources?
4. Southern New England Collaborative
Research Initiative (SNECRI)
• NOAA funding became available through
• CFRF Directors dedicated funding to assist in
expanding our knowledge of quahog dynamics in
the bay
• In 2011, the project was started to address some
of the questions proposed in discussions with
DEM Marine Fisheries
5. An assessment of quahog larval supply and distribution in the
upper Narragansett Bay with a focus on spawning sanctuaries
and alternative area management strategies.
• Develop a cooperative assessment of quahog standing stock and
reproductive condition in the upper NarBay with commercial
fishermen
– Conduct side-by-side quahog stock assessments comparing the
efficacy of the RI DEM’s standard method (hydraulic dredge) with the
commercial bullrake and diver quadrat sampling
• Through the application of the ROMS Hydrodynamic Model for
NBay, simulate specific quahog larval release points (spawning
areas) based on stock assessments and predict sites of juvenile
recruitment resulting from these releases
• Using the results of the model, validate predicted larval settlement
sites through a combined effort of surface drifter deployments and
monitoring for the occurrence of quahog larvae
• Apply the prediction of quahog larval sources and sinks to the
development of a state-wide shellfish management plan currently
under discussion among RI-DEM, CRMC, CRC, and others.
6. An assessment of quahog larval supply and distribution in the
upper Narragansett Bay with a focus on spawning sanctuaries
and alternative area management strategies.
• Develop a cooperative assessment of quahog standing stock and
reproductive condition in the upper NarBay with commercial
fishermen
– Conduct side-by-side quahog stock assessments comparing the
efficacy of the RI DEM’s standard method (hydraulic dredge) with the
commercial bullrake and diver quadrat sampling
• Through the application of the ROMS Hydrodynamic Model for
NBay, simulate specific quahog larval release points (spawning
areas) based on stock assessments and predict sites of juvenile
recruitment resulting from these releases
• Using the results of the model, validate predicted larval settlement
sites through a combined effort of surface drifter deployments and
monitoring for the occurrence of quahog larvae
• Apply the prediction of quahog larval sources and sinks to the
development of a state-wide shellfish management plan currently
under discussion among RI-DEM, CRMC, CRC, and others.
7. Develop a cooperative assessment of quahog standing stock in the upper
Narragansett Bay with commercial fishermen.
– Develop improved stock assessment protocols
• The ultimate goal is to have RI quahoggers conduct their own
stock assessment, in collaboration with DEM Marine Fisheries
– Step 1
• Bullrake sampling
– Want to compare the effectiveness of a bullrake to other stock
assessment methods
– Diver sampling is highest standard
• How?
– Measure exact area that a bullrake samples
» Need to know width and length of sample track
– Count the number of quahogs and measure their size
8. Area sampled with a bullrake?
• Width
– 15”
• Tooth length
– 1.5” to 3”
• Length of
sample track?
– That’s a problem!
• With the rake at the
end of a rigid pole, can we measure the distance
the handle travels as a proxy for the distance the
rake travels?
9. Bullrake calibration with dGPS
• Global Positioning Service (GPS)
– Routinely good to locate within 10 meters (~30 feet)
– Usually okay for navigation but…
• Differential GPS
– Utilizes a base station to increase
accuracy
– Can be accurate to within 10 cm (4 in)
• Attach dGPS to a bullrake
– Can track the movement of the
rake across the bottom
15. 0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 10 20 30 40 50 60
Amountoferrorinmeasuringtransectlength(m)
Angle of deflection from transect line (degrees)
4 m stale with 24 m transect
8 m stale with 24 m transect
14 m stale with 24 m transect
4 m stale with 30 m transect
8 m stale with 30 m transect
14 m stale with 30 m transect
Error due to stale angle off from transect direction
20. – Step 2
• Conduct side-by-side quahog stock assessments between DEM
hydraulic dredge and bullrakers
Develop a cooperative assessment of quahog standing stock and
reproductive condition in the upper NarBay with commercial
fishermen
23. RI-DEM Tow
ID
Dredge
adjusted for
57.7%
efficiency
Bullrake
adjusted for
90%
efficiency StDev Substrate type
2389 15.36 9.37 2.22 hard bottom
2393 0.80 0.12 0.11 hard bottom
2424 20.19 13.73 6.87 very hard bottom
2429 3.29 8.05 4.60 moderate hard bottom
2445 0.43 0.77 0.70 soft mud
2448 6.40 6.63 3.99 soft sticky mud
2453 0.80 0.43 0.33 soft sticky mud
2484 0.47 3.21 2.13 soft sticky mud w/ shell
2485 5.13 11.80 6.41 hard w/ shells
2496 4.54 10.37 1.74 moderate hard bottom
GB adjacent 1.11 1.99 1.07 soft mud w/ shell
average 5.32 6.04
stdev 6.59 4.95
Bullrake – DEM Dredge comparison
24. Discussion with RIDEM – Marine
Fisheries
• Looks like a bullrake is a viable stock assessment tool.
– If the dredge catch efficiency is factored in – then the two
techniques appear to measure quahog density similarly.
– Can we improve on the technique?
• What more do we need to do to confirm this
observation?
– How many samples are required?
• Is there a role for quahoggers to assist in stock
assessment?
– How many samples would be needed to “calibrate” a
quahogger?
• If it works, how do we make it happen?
– Starting during summer 2014 – quahoggers may be used to
sample shallow coves where dredge can not sample.
25. Quahog Reproduction
• Some attempts to
manage areas for quahog
reproduction
– Areas with high numbers
of quahogs that allow for
intensive reproduction
• Spawning Sanctuaries
• Closed areas
• May be problematic
– Quahogs in protected
areas may not be
spawning!!!!
Marroquin-Mora & Rice (2008)
26. Reproductive effort study
• Selected 8 sites for
long-term
sampling
• Sample 2x per
month
• Assess for gonad
condition, i.e.
reproductive
status
Site Lat Lon Density Fishing Status
*Bissel Cove 41 32.520 71 25.164 Low Open
*Greenwich Cove 41 40.160 71 26.529 High Closed
*Spawner Sanctuary 41 40.050 71 23.630 Med Closed
*Rocky Pt. 41 41.940 71 21.111 Med Open
*Providence River 41 45.650 71 22.030 High Closed
Conditional Area B 41 40.475 71 20.370 Low Conditional
Prudence Island 41 38.055 71 19.622 Med/High Open
*Hog Island 41 38.136 71 16.689 Low Open
27. Reproductive Condition of Quahogs: Efficacy of Transplants
• 2012
– Condition Index & Gonad
Index at 8 sites
• Sample every 3 weeks
• Open, closed & sanctuary
– Mark/Recapture experiment
• Tag 1,600 quahogs from
Greenwich Cove
• Transplant to Spawning
Sanctuary
• 2013
– Repeat 2012 (April –
November)
– Mark-Recapture experiment
• Sample every 3 weeks (April –
November)
• Condition Index & Gonad
Index
28. Reproductive Condition of Quahogs
Preliminary Results
Significantly lower
mean CI in closed sites
2012 and 2013 fall
gonad recovery
different
60
70
80
90
100
110
120
130
140
150
10-Apr-12 30-May-12 19-Jul-12 7-Sep-12 27-Oct-12
MeanConditionIndex
Open
Sanctuary
Closed
60
70
80
90
100
110
120
130
140
150
10-Apr-13 30-May-13 19-Jul-13 7-Sep-13 27-Oct-13
MeanConditionIndex
Open
Sanctuary
Closed
2012
2013
29. Recruitment
• Based on our stock
surveys and
consultation with
quahoggers, we know
where there are high
concentrations of
reproductive quahogs
• However, what happens
to the quahog larvae
following gamete
release?
Providence
River
Rocky Point
DEM Spawning
Sanctuary
Hog Island
Greenwich
Cove
Bissel Cove
30. An assessment of quahog larval supply and distribution in the
upper Narragansett Bay with a focus on spawning sanctuaries
and alternative area management strategies.
• Develop a cooperative assessment of quahog standing stock and
reproductive condition in the upper NarBay with commercial
fishermen
– Conduct side-by-side quahog stock assessments comparing the
efficacy of the RI DEM’s standard method (hydraulic dredge) with the
commercial bullrake and diver quadrat sampling
• Through the application of the ROMS Hydrodynamic Model for
NBay, simulate specific quahog larval release points (spawning
areas) based on stock assessments and predict sites of juvenile
recruitment resulting from these releases
• Using the results of the model, validate predicted larval settlement
sites through a combined effort of surface drifter deployments and
monitoring for the occurrence of quahog larvae
• Apply the prediction of quahog larval sources and sinks to the
development of a state-wide shellfish management plan currently
under discussion among RI-DEM, CRMC, CRC, and others.
31. Objectives of this portion of
talk:
• Describe results of particle tracking
simulations in Narragansett Bay for
the purpose of evaluating the
dispersal of planktonic quahog
larvae.
• Demonstrate the important effect of
larval behavior (vertical swimming)
on dispersal in the Bay.
32. Model Domains:
•Low resolution
•Nested high
resolution
Realistically-Forced
Circulation Model
Nested (ROMS) configuration:
• Low resolution model extending
onto continental shelf provides
boundary conditions for high-
resolution Bay model.
• Curvilinear grid with resolution
of 50-100m in upper Bay.
• Sigma vertical coordinate (15
levels).
• Forced with measured river
inflows and surface fluxes and
tides from ADCIRC (NOAA).
• Simulate 45 day period (May
15-June 30, 2007).
35. Larval Tracking Model
Larval dispersal modeled with Lagrangian TRANSport model
(LTRANS) developed by E. North and collaborators (U. Maryland):
• 4th order Runga-Kutta advection using ROMS velocities.
• Random displacement model, based on ROMS vertical
diffusivity simulates effect of vertical turbulence.
• Zero horizontal diffusion in our application.
• Particles reaching open boundary assumed lost to the
system.
• Perform simulations without larval behavior (passive
particles) and with vertical swimming.
Clusters of 65 particles released every 2 hours over a 1 month
period at 6 potential sanctuary sites:
• Get trajectory simulations under wide range of forcing
conditions (e.g. wind, tide, mixing) characteristic of the ~1
month spawning period of hard clams.
36. Example trajectory
simulations:
• Clusters of 65 particles
released every hour for 6
hours.
• Particles tracked over 24
hours (starting at time of
1st release).
Illustrates the variability in
particle trajectories
depending on the time
(relative to the tidal cycle)
of release.
37. Example trajectory
simulations:
• Clusters of 65 particles
released every hour for 6
hours.
• Particles tracked over 24
hours (starting at time of
1st release).
Illustrates the variability in
particle trajectories
depending on the time
(relative to the tidal cycle)
of release.
38. Passive Particles, Spatial Distributions after 10 Days
Particles Released
From Providence
River Site
2006: 34% lost 2007: 20% lost
39. Passive Particles, Spatial Distributions after 10 Days
2006: 51% lost 2007: 45% lost
Particles Released
From GB Spawner
Sanctuary Site
40. Passive Particles, Spatial Distributions after 10 Days
2006: 21% lost 2007: 11% lost
Particles Released
From Greenwich
Cove Site
41. Passive Particles, Spatial Distributions after 10 Days
2006: 95% lost 2007: 96% lost
Particles Released
From Rome Point
Site
42. Passive Particles, Spatial Distributions after 10 Days
2006: 46% lost 2007: 35% lost
Particles Released
From Hog Island
Site
43. Passive Particles, Spatial Distributions after 10 Days
2006: 43% lost 2007: 34% lost
Particles Released
From Rocky Point
Site
44. Larval Behavior
Hard clam larvae:
• Planktonic stage lasts 1-2 weeks (T dependent).
• Swim upward early in planktonic period, downward later.
(LTRANS superimposes a degree of randomness on this
pattern.)
Model swimming behavior:
upward
downward
45. Passive versus Active Particles, Spatial Distributions after 10 Days
2007, Passive: 20% lost 2007, Active: 53% lost
Particles Released
From Providence
River Site
46. An assessment of quahog larval supply and distribution in the
upper Narragansett Bay with a focus on spawning sanctuaries
and alternative area management strategies.
• Develop a cooperative assessment of quahog standing stock and
reproductive condition in the upper NarBay with commercial
fishermen
– Conduct side-by-side quahog stock assessments comparing the
efficacy of the RI DEM’s standard method (hydraulic dredge) with the
commercial bullrake and diver quadrat sampling
• Through the application of the ROMS Hydrodynamic Model for
NBay, simulate specific quahog larval release points (spawning
areas) based on stock assessments and predict sites of juvenile
recruitment resulting from these releases
• Using the results of the model, validate predicted larval settlement
sites through a combined effort of surface drifter deployments and
monitoring for the occurrence of quahog larvae
• Apply the prediction of quahog larval sources and sinks to the
development of a state-wide shellfish management plan currently
under discussion among RI-DEM, CRMC, CRC, and others.
54. Looking for the larvae
Name Lat Long
Anticipated
larval
supply
Greenwich Cove 41.661637 -71.442319 High
Chepiwanoxet 41.676307 -71.442443 High
Sandy Point 41.664646 -71.405473 Low
Spawning Sanctuary 41.669821 -71.389343 Low
Sugar Mountain 41.655645 -71.370999 High
Warwick Neck 41.663884 -71.368550 High
Hope Island 41.377688 -71.377688 Low
55. An assessment of quahog larval supply and distribution in the
upper Narragansett Bay with a focus on spawning sanctuaries
and alternative area management strategies.
• Develop a cooperative assessment of quahog standing stock and
reproductive condition in the upper NarBay with commercial
fishermen
– Conduct side-by-side quahog stock assessments comparing the
efficacy of the RI DEM’s standard method (hydraulic dredge) with the
commercial bullrake and diver quadrat sampling
• Through the application of the ROMS Hydrodynamic Model for
NBay, simulate specific quahog larval release points (spawning
areas) based on stock assessments and predict sites of juvenile
recruitment resulting from these releases
• Using the results of the model, validate predicted larval settlement
sites through a combined effort of surface drifter deployments and
monitoring for the occurrence of quahog larvae
• Apply the prediction of quahog larval sources and sinks to the
development of a state-wide shellfish management plan currently
under discussion among RI-DEM, CRMC, CRC, and others.
56. What next?
• Will continue to work with the quahog fishing
fleet and RIDEM Marine Fisheries to integrate
bullraking into their stock assessment process.
• RI Sea Grant has funded continuation of the
ROMS modeling effort where we will add more
years to the data set to look at annual variability.
• Will more closely analyze the reproductive cycle
in the quahogs collected in 2012/2013.
• Will integrate the results from this study into our
baseline knowledge for use in the Shellfish
Management Plan.