Iwan Ridwansyah Morphometricand Watershedof Lake Diatas

MORPHOMETRIC CHARACTERISTIC and GENERATING WATERSHED in DIATAS LAKE West Sumatera by Iwan Ridwansyah

Technology

3D Assignment

Iwan Ridwansyah
y
G051070071

Bogor Agriculture University
2008

Lake Morphometrics1 is a field concerned with studying variation
and change in the form (size and shape) of the Like.[1] There are
g ( p )
several methods for extracting data from shapes, each with their own
benefits and weaknesses. These include measurement of lengths and
angles, landmark analysis and outline analysis.

Diatas lake is located at 100o 43” 1”
– 100o 50’ 26” E dan 1o 1’ 51” – 1o 7’
39” S .
This lake is that one of twin lake ,
on the north be found another
lake l d b
l k caled Dibawah Lake.
h k
Both of the lake diposition on
Great Sumatra fault and to certain
formed b t t i activities (P
f d by tectonic ti iti (P.
Lehmusluoto and B. Machbub,
1977)

Bathymetric Mapping Method
GIS

3DAnalyst

Bathymetric Map

Bathymetric Map

B
Volume of Diatas Lake = 302,06 x 106 m3
Surface Area = 12,451,642 m2
A’

A

B’

Retention Time
Volume
Re tension time ( Rt ) =
Disch arg e

302 x 106 m3
1.25 m3/sec

7.7 year.

Measurement of water flow in outlet of Lake (used
Current meter)

The time required to refill an empty lake with natural inflow.
‐ R t ti ti i d d t d t
Retention time is needed to determine an annual lake budgets for water,
i l l k b d t f t
nutrient, heat, oxygen contaminants, and herbicides
‐ Its Also provide an estimate on the turn over time for water in a like, or
“flushing time”
flushing time

Morphometry characteristic of Lake Diatas

No.
No Parameter Dimension Source
1 Surface Area (m2) 12451642 Rupa bumi Map
2 Perimeter (km) 19.97 idem
3 Ma im m Length
Maximum (m) 6419 idem
4 Maximum Wide (m) 2878 idem
5 Maximum depth (m) 47 Field
6 Volume (m3) 302 06 x 106
302.06 Bathymetric Map
7 Depth Average (m) 24.3 Calculation
8 Relative Depth (Zr) (%) 1.18 idem
9 Short Line Development (DL) 1.59
1 59 Idem
10 RetentionTime (year) 7.7

GENERATING WATERSHED
SRTM data

3D Analyst

Derived Contur Hydrology Model

Digitize on Screen

Watershed Boundary

Watershed Boundary
W t h d B d

Calculating Flow Accumulation
C l l i Fl A l i

Generating Watershed
g
Difference between
digitize on screen and
Hydrology model

Compared Digitize and Hydrology model

Difference between
digitize on screen and
g
Hydrology model

Reference
WETZEL, R. G. 1983. Limnology. W. B. Saunders College Publ., Philadelphia. 743 pp.

P Lehmusluoto et all 1995 National Inventory of The Major Lakes and Reservoirs in Indonesia
P. Lehmusluoto, all, 1995, Indonesia,
Research Institute for Water Resources Development Ministry of Public Works Agency for
Research and Development Bandung, Indonesia.

This document discusses a model-supported monitoring strategy used to assess the impact of land reclamation by the Port of Rotterdam on coastal turbidity. Traditional ship-borne monitoring was limited in spatial and temporal resolution. The new strategy used a numerical model integrated with remote sensing data and in situ measurements to provide high resolution spatiotemporal insights into turbidity trends. The model was optimized using remote sensing data, then validated and used for trend analysis, allowing detection of turbidity changes with greater significance than traditional monitoring alone.

DSD-INT 2015 - Monitoring Maasvlakte 2 impact - IR. William Borst

Construction of Maasvlakte 2 began in 2009 and involved extracting 300 million cubic meters of sand from a borrow area 10 km offshore using a Trailing Suction Hopper Dredger. An environmental impact assessment was conducted and identified potential effects from increased turbidity caused by sand extraction such as reduced primary production, less growth of marine life, and insufficient food for protected bird species. Monitoring of silt concentrations was required every two weeks during construction at three cross sections, but a new "Model Supported Modelling of Suspended Matter" approach using remote sensing data and validation with in-situ measurements was proposed to the authorities and produced silt atlases from 2003-2011.

DSD-INT 2017 Planetary-scale surface water detection from space - Donchyts

DSD-INT 2017 Modelling net-deposition of cohesive sediments within the ETM of...

This document describes a study that used a 3D numerical model to simulate net deposition of cohesive sediments in the estuarine turbidity maximum (ETM) zone of the Weser River estuary in Germany. The model was able to reproduce observed patterns of sediment concentration in the ETM and the approximate volume of sediment deposited annually, which is similar to the volume dredged for navigation. The model results indicate a stable long-term ETM that shifts seasonally depending on river discharge. Future work could improve the model by adding more sediment fractions, incorporating waves, allowing erosion of consolidated bed sediments, and making the model fully morphodynamic.

DSD-INT 2017 Global modelling of hydrology and water resources: current state...

DSD-INT 2017 The omnipotent river manager - automated intervention planning a...

Lisbon talk for SteepStreams

Riccardo Rigon

DSD-INT 2017 Coupled physical – ecological models to assist assessment of eff...

Kristopher Kuhlman and Anke Schneider are collaborating to improve basin-scale groundwater flow and solute transport models near salt repositories. Their efforts include reimplementing and extending an existing 1996 groundwater model of the WIPP basin to include density dependent flow and improved mesh elements. They have implemented solute concentration-dependent fluid density in the PFLOTRAN model and conducted initial model comparisons. This work will lead to an updated regional groundwater flow and chemistry model for the WIPP area and improved understanding of issues in past and future regional models surrounding salt repositories.

Geovisualization of coastal areas from heterogeneous spatio-temporal data (An...

GeoVIS'15 Workshop

On coastal areas, recent increase in production of open-access high-quality data over large areas reflects high interests in modeling and geovisualization, especially for applications of sea level rise prediction, ship traffic security and ecological protection. Research interests are due to tricky challenges from the intrinsic nature of the coastal area, which is composed of complex geographical objects of which spatial extents vary in time, especially in the intertidal zone (tides, sands, etc.). Another interest is the complex modeling of this area based on imprecise cartographic objects (coastline, highest/lowest water level, etc.). The challenge of visualizing such specific area comes thus from 3D+t information, i.e. spatio-temporal data, and their visual integration. In this paper, we present a methodology for geovisualization issues over coastal areas. The first challenge consists in integrating multi-source heterogeneous data, i.e. raster and vector, terrestrial and hydrographic data often coming from various ‘paradigms’, while providing a homogeneous geovisualization of the coastal area and in particular the phenomenon of the water depth. The second challenge consists in finding various possibilities to geovisualize this dynamic geographical phenomenon in controlling the level of photorealism in hybrid visualizations. Our approach is based on the use of a high-resolution Digital Terrain Model (DTM) coming from high resolution LiDAR data point cloud, tidal and topographic data. We present and discuss homogeneous hybrid visualizations, based on LiDAR and map, and on, LiDAR and orthoimagery, in order to enhance the realism while considering the water depth.

Homogeneous geovisualization of coastal areas from heterogeneous spatio-tempo...

Antoine Masse

This document discusses approaches to visualizing coastal areas and water depth in a geovisualization context. It presents 4 examples of visualizing water depth around coastal areas using different data sources and stylization approaches, from abstraction maps to ortho-imagery photo-realism. The examples demonstrate conveying water depth and tide dynamics both statically and dynamically. The goal is to improve water depth perception and provide a visually continuous representation of land and sea for non-expert users. Future work could include user evaluations and integrating the approaches into applications.

Chris Spry Enviro Final

Wuzzy13

This document summarizes a storm water modeling project for the Town Creek Watershed in Salisbury, NC that analyzed changes in land use and storm water runoff between 1978 and 2009. Digital elevation data, soil data, and aerial/satellite imagery from 1978 and 2009 were used to create land cover maps and calculate storm water runoff for each time period using the Curve Number runoff method. The results showed increases in urban area and storm water runoff over time, reinforcing the impact of urbanization. Issues included limitations of the Curve Number method for less elevated, more urbanized areas.

Solute transport in soils

Nirmal Kumar

DSD-INT 2017 Groundwater in Global Hydrology - Bierkens

Soil-Water Flow and Solute Transport during Redistribution

Morteza Sadeghi

A new method has been developed for scaling water flow and solute transport during soil water redistribution process. The scaled solutions are invariant for a broad range of soil textures and initial conditions. The invariance of the scaled solutions gives an insight regarding features of the process considered and provides an easy way to obtain approximate solutions of the highly non-linear governing equations.

DSD-INT 2017 Introduction to River Basin Simulation RIBASIM - Van der Krogt

1) RIBASIM is a river basin simulation modeling system used to balance water supply and demand. 2) The document provides an overview of RIBASIM version 7.01 and its components for modeling hydrology, water usage, management measures, and other factors within a river basin system. 3) RIBASIM can generate outputs such as water balance, reservoir behavior over time, crop production costs, and flow composition to help assess supply reliability and support integrated water resource management planning.

DSD-INT 2016 SUB-CR: an improved subsidence package - Erkens, Kooi

DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen

DSD-INT 2016 Regional groundwater flow systems in the Kenya Rift Valley - Mur...

DSD-INT 2016 Groundwater model Visp - Christe

DSD-INT 2016 Regional to local modeling for dyke stability -The Schoonhovense...

DSD-INT 2016 The SFR-package in iMOD to support large-scale groundwater flow ...

SFRM techniques and case study

GangaPR1

1) The document discusses sustainable flood risk management (SFRM) and the use of detention ponds to reduce flood risk. 2) It provides a case study of using detention ponds in Guwahati City, India to reduce flood depth and inundated area based on land use changes between 2006 and 2011. 3) The study found that a detention pond was able to reduce the maximum flood depth by 46.5% and flood inundated area by 43% for the 2011 land use, demonstrating the effectiveness of detention ponds for urban flood mitigation.

Ppt 29-03-2017-reservoir characterisation and 3-d static modelling of “awe fi...

Toba Awe

The document presents reservoir characterization and 3D static modeling of the Awe Field in the Niger Delta. Key findings include: 1. Petrophysical analysis of two reservoirs, G and I, across five wells found reservoir G has better porosity (29%) and permeability (262.5 mD) than reservoir I (26% porosity, 77.06 mD permeability). 2. 3D seismic interpretation identified faults within the field and mapped reservoir structure. Reservoir G contains two main faults while reservoir I has one minor fault. 3. Static modeling estimated reservoir G has a stock tank oil initially in place of 156 MMSTB while reservoir I contains 127 MMSTB, indicating reservoir G has greater

On the Oceanography of Brazil’s Equatorial Margin: Hazardous Offshore Current...

David Fratantoni

This document discusses the oceanography of Brazil's Equatorial Margin and strategies for mitigating hazards from strong offshore currents. It notes the region has development opportunities but also strong, variable currents that are not well understood. It recommends a regional ocean observing and prediction system to improve safety by providing accurate current measurements and forecasts. A prototype system is now operational, utilizing drifter deployments, model runs, and weekly reports.

Reservoir Identification

Dalia Hassan

Impacts of SWC interventions and land use on discharge and sediment yield at ...

africa-rising

Soil Erosion for Vishwamitri River watershed using RS and GIS

vishvam Pancholi

1) This document summarizes a study of soil erosion in the Vishwamitri River watershed using the Universal Soil Loss Equation (USLE). 2) The USLE factors of rainfall (R), soil erodibility (K), slope length and steepness (LS), crop management (C), and supporting practices (P) were calculated for four sub-watersheds using GIS and remote sensing data. 3) The results showed that two of the sub-watersheds (SW1 and SW2) have very severe soil erosion rates of over 97 and 129 tons/ha/year respectively, and should be prioritized for soil conservation measures.

Sijampang

3D Analyst - Cut and Fill

This document outlines the steps taken to determine material loss in the Grasberg area of Papua caused by private company exploration using a 3D analysis technique called cut and fill. The analysis involved generating elevation data points from SRTM data, converting the points to a vector file, creating a TIN surface, and executing a cut and fill between two TINs to calculate the volume of material loss in cubic meters.

What's hot

27 kuhlman basin scale density-dependent groundwate sand2016-9236 a

leann_mays

Geovisualization of coastal areas from heterogeneous spatio-temporal data (An...

GeoVIS'15 Workshop

Homogeneous geovisualization of coastal areas from heterogeneous spatio-tempo...

Antoine Masse

Chris Spry Enviro Final

Wuzzy13

Solute transport in soils

Nirmal Kumar

DSD-INT 2017 Groundwater in Global Hydrology - Bierkens

Soil-Water Flow and Solute Transport during Redistribution

Morteza Sadeghi

DSD-INT 2017 Introduction to River Basin Simulation RIBASIM - Van der Krogt

DSD-INT 2016 SUB-CR: an improved subsidence package - Erkens, Kooi

DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen

DSD-INT 2016 Regional groundwater flow systems in the Kenya Rift Valley - Mur...

DSD-INT 2016 Groundwater model Visp - Christe

DSD-INT 2016 Regional to local modeling for dyke stability -The Schoonhovense...

DSD-INT 2016 The SFR-package in iMOD to support large-scale groundwater flow ...

SFRM techniques and case study

GangaPR1

Ppt 29-03-2017-reservoir characterisation and 3-d static modelling of “awe fi...

Toba Awe

On the Oceanography of Brazil’s Equatorial Margin: Hazardous Offshore Current...

David Fratantoni

Reservoir Identification

Dalia Hassan

Impacts of SWC interventions and land use on discharge and sediment yield at ...

africa-rising

Soil Erosion for Vishwamitri River watershed using RS and GIS

vishvam Pancholi

What's hot (20)

27 kuhlman basin scale density-dependent groundwate sand2016-9236 a

Geovisualization of coastal areas from heterogeneous spatio-temporal data (An...

Homogeneous geovisualization of coastal areas from heterogeneous spatio-tempo...

Chris Spry Enviro Final

Solute transport in soils

DSD-INT 2017 Groundwater in Global Hydrology - Bierkens

Soil-Water Flow and Solute Transport during Redistribution

DSD-INT 2017 Introduction to River Basin Simulation RIBASIM - Van der Krogt

DSD-INT 2016 SUB-CR: an improved subsidence package - Erkens, Kooi

DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen

DSD-INT 2016 Regional groundwater flow systems in the Kenya Rift Valley - Mur...

DSD-INT 2016 Groundwater model Visp - Christe

DSD-INT 2016 Regional to local modeling for dyke stability -The Schoonhovense...

DSD-INT 2016 The SFR-package in iMOD to support large-scale groundwater flow ...

SFRM techniques and case study

Ppt 29-03-2017-reservoir characterisation and 3-d static modelling of “awe fi...

On the Oceanography of Brazil’s Equatorial Margin: Hazardous Offshore Current...

Reservoir Identification

Impacts of SWC interventions and land use on discharge and sediment yield at ...

Soil Erosion for Vishwamitri River watershed using RS and GIS

Viewers also liked

Sijampang

3D Analyst - Cut and Fill

3D Analyst - Lab

This document provides an overview of tools and techniques for 3D analysis in GIS, including interpolating surfaces from point data, creating contours and derivative surfaces, analyzing visibility, and comparing surfaces for cut-fill analysis. It discusses various interpolation methods like inverse distance weighting and spline that can be used to generate grid surfaces from point data. Methods for analyzing terrain properties like slope, aspect and hillshade are also covered. The document concludes with explanations of how to determine line of sight and create viewsheds for visibility analysis, as well as how to compare two surfaces to determine cut and fill volumes.

Greenwich

Citra Anaglyph untuk Tampakan 3-Dimensi

3D Analyst - Lake Lorelindu by GRASS

This document describes using the open source GIS software GRASS to calculate the volume of Lore Lindu Lake in Central Sulawesi, Indonesia. It details the steps taken, which include importing polygon and depth point data, creating a bathymetry map using inverse distance weighted interpolation, generating contour and slope maps, viewing the results in 3D, and calculating the lake volume as 143449194.374 cubic meters using the r.volume command. The document concludes that GRASS provides an accessible and flexible way to perform this hydrological analysis and 3D volume calculation.

Ahmad Mauliddin Vol Of Water In Bili Bili

The document describes using ArcGIS 3D Analyst to calculate the volume of water in Bili-Bili Reservoir in South Sulawesi Province, Indonesia. 3D Analyst allows users to visualize spatial data in three dimensions, determine heights anywhere on a surface, calculate volumetric differences between two surfaces, and work with 3D vector features. The analysis will use a topographic map and shapefile of the Bili-Bili Reservoir boundaries to find the volume of water.

3D Analyst Lab 1

3D Analyst - Watershed, Lombok

This document outlines the 7 main steps to delineate a watershed area in Lombok, Indonesia: 1) Create a digital elevation model from SRTM data, 2) Remove errors from the DEM, 3) Generate flow direction, 4) Generate flow accumulation, 5) Generate stream channels, 6) Generate stream links, 7) Generate the watershed area. ArcGIS and ArcScene software are used to complete the delineation and visualize the 3D watershed area.

3D Watershed Celebes

This document outlines the steps to derive watersheds in Central Celebes, Indonesia from SRTM data using 3D modeling software and ArcGIS tools: 1) Load and preprocess SRTM data to create a DEM raster, including cropping, filling blanks, converting projections, and saving as a GeoTIFF. 2) Perform terrain analysis in ArcGIS to calculate flow direction, flow accumulation, stream definition, stream segmentation, and catchment grid delineation using the ArcHydro tools. 3) View the resulting watersheds and hydrological networks in 3D in ArcScene by setting the appropriate layer properties and vertical exaggeration.

3D Analyst - Watershed, Tomohon

Aleksandra Ziemińska-Stolarska

The document summarizes a project to delineate a watershed area and identify streams in the Tomohon Agripolitan area of Indonesia using 3D modeling software. Key steps included creating a digital elevation model from SRTM data, removing errors from the DEM using ArcGIS tools, generating flow direction and accumulation rasters, identifying stream channels, assigning stream segments unique IDs, and using the results to generate the watershed boundary. 3D views of the area were also created in Global Mapper and ArcScene with overlays of rivers and roads.

Viewers also liked (11)

Sijampang

3D Analyst - Cut and Fill

3D Analyst - Lab

Greenwich

Citra Anaglyph untuk Tampakan 3-Dimensi

3D Analyst - Lake Lorelindu by GRASS

Ahmad Mauliddin Vol Of Water In Bili Bili

3D Analyst Lab 1

3D Analyst - Watershed, Lombok

3D Watershed Celebes

3D Analyst - Watershed, Tomohon

Similar to Iwan Ridwansyah Morphometricand Watershedof Lake Diatas

Lake mead water management numerical model

yipinghhu

This document describes modeling the impacts of declining water levels on the hydrodynamics, thermal structure, and water ages of Lake Mead under changing climate conditions. The authors developed a 3D hydrodynamic model of Lake Mead calibrated for water level and temperature. The model was applied to simulate current (2000) and potential future (2017) water levels. Results showed declining water levels would increase water temperatures by 2-7°C, accelerate water movement, and impact habitat and water quality. Modeling challenges with pressure gradients were addressed by increasing vertical resolution and horizontal viscosity parameters.

Effects of shale volume distribution on the elastic properties of reserviors ...

DR. RICHMOND IDEOZU

Shale volume (Vsh) estimation has been carried out on three selected reservoirs (Nan.1, Nan.2, and Nan.4) distributed across four wells (01, 03, 06, and 12) in Nantin Field, using petrophysical analysis and reservoir modeling techniques with a view to understanding the reservoir elastic properties. Materials utilized for this research work include: Well Log data (Gamma Ray Log, Resistivity Log, Sonic Log, Density Log, Neutron porosity log), and a 3-D Seismic volume were used for the study. Sand and shale were the prevalent lithologies in Nantin Field. Nan. 1 reservoir was thickest in Nantin well 12 (29.7ft), Nantin 2 reservoir was thickest in Nantin Well 12 (30.9ft) while Nantin 4 reservoir was thickest in Well 3 (72ft). Correlation well panel across the Field showed that Nantin 4 reservoir, was thicker than Nan 1 and Nan 2 Reservoir respectively. Normal and synthetic Faults were also mapped, the trapping system in the field includes anticlines in association with fault closures. The thicknesses and lateral extents of these reservoirs were delineated into three zones (1, 2, and 3) which were modeled appropriately. Petrophysical and some elasticity parameters such as Poisson ratio (PR), Acoustic Impedance (AI), and Reflectivity Coefficient (RC) were evaluated for the wells. The results from elasticity evaluation showed a high Poisson Ratio of 0.40 in Nantin 2 reservoir of Well 12 based on high shale volume distribution of 0.70 indicating high stress level and possible boundary to hydraulic fracture. The lowest Poisson Ratio was evaluated in Nantin reservoir of Well 1 with lowest shale volume of 0.18 which indicates weak zones and may not constrain a fracturing job. Results from Acoustic impedance showed a high AI value of 7994.3 in Nan 2 Reservoir compared to Nan.1 which has the least AI value of 7447.3 because of low shale volume. A higher Reflectivity Coefficient of 0.01 was recorded in Nan.2 reservoir indicating bright spot while a lower RC of -0.00023 was recorded in Nan.4 Reservoir indicating dim spot. Hydrocarbon volume estimate of the three reservoirs showed 163mmstb in Nan.1 reservoir, 169mmstb, in Nantin 2 reservoir and 115mmstb in Nan. 4 Reservoir. The reservoirs encountered were faulted and laterally extensive. Nantin 2 reservoir was more prolific with a STOIIP of 169 mmstb compared to Nan. 1 with a STOIP of 163 mmstb and Nantin.4 with a STOIP of 115 mmstb, because of its good petrophysical values, facies quality and low shale volume distributions.

Dynamic Habitat - CLLAMM technical briefing

University of Adelaide

This document summarizes research on dynamic habitat mapping in the Coorong region of Australia. It includes sections on developing a digital elevation model, sediment mapping, habitat mapping, mudflat geomorphology, and spatial modeling of mudflat availability and fish habitat. Methods such as bathymetric modeling from imagery, sediment modeling using generalized additive modeling, and developing a dynamic habitat model linking bathymetry, water levels from hydrodynamic modeling, and outputs like mudflat area are described. Key findings are that the South Lagoon contains most of the available mudflat habitat and manipulating water levels between 0-0.5m AHD would maximize habitat productivity and availability.

CFD modeling

The document analyzes water eutrophication in the Sulejow Reservoir in Poland using coupled CFD and WASP models. A 3D CFD model was developed to simulate hydrodynamics, which was then verified with field measurements. The WASP model was used to simulate nutrient transport and cycling factors like phytoplankton growth, considering hydrodynamics from the CFD model. The results showed proper correlation between measured and calculated values, indicating the models realistically captured the distribution of temperatures, velocities and nutrient concentrations contributing to eutrophication in the reservoir. The methodology can be applied to other reservoir systems to analyze ecological status.

Cy24649654

This document presents a study that modifies the Nakayasu synthetic unit hydrograph method for use in ungauged watersheds. The study was conducted on 20 meso-scale watersheds in Java, Indonesia. Observation unit hydrographs were calculated using the convolution method and compared to Nakayasu synthetic unit hydrographs. Comparison parameters between the two hydrographs were used to optimize nine coefficients in the Nakayasu equations to minimize error. The modified Nakayasu method provides improved accuracy for rainfall-runoff modeling in ungauged watersheds based on area, length of main rivers, and slope.

Poster Presentation

santoshborate2

This document discusses modeling watershed dynamics using a cellular automata (CA)-Markov model approach. The objectives are to generate land use/land cover databases from satellite data over time, analyze indicators and drivers of watershed changes, derive transition matrices and suitability images, and project future watershed scenarios to 2024. The study area is a 195 square kilometer watershed in India. Land use/land cover data from 1972-2004 shows changes over time in classes like water, wetland, forest, and agriculture area. Spatial layers of soil, land use, roads, drainage, and slope are generated. The CA-Markov model will integrate Markov transition matrices with CA suitability maps to predict future watershed conditions and

Ecohydrodynamics of cold-water corals - Juan moreno-Navas

Heriot-Watt University

1) Ecohydrodynamics studies the physical constraints of ecosystems based on time and spatial scales, and incorporates the water characteristics surrounding marine environments. 2) The ecohydrodynamic conditions around cold-water coral reefs determine food and larvae supply through interactions between currents, internal waves, and topography. 3) A 3D ocean model of the Mingulay Reef complex in the Sea of Hebrides shows tidally-driven currents and downwelling of surface waters delivering pulses of food to the reefs every six hours.

Modelling of Seawater Intrusion

C. P. Kumar

The document discusses modeling of seawater intrusion in coastal aquifers. It provides background on seawater intrusion as a natural process driven by density differences between fresh and saltwater. It describes various numerical models that can be used to simulate variable density groundwater flow and solute transport, including SEAWAT, SUTRA and MODFLOW. As an example application, it summarizes a study that used SUTRA to model seawater intrusion and the influence of tides on the fresh water resources of Nauru Island. The study found tidal forcing significantly reduced the size of the freshwater lens.

Gq2512111220

This document analyzes water samples from 258 wells in fractured sandstone basins in Mali. Statistical analysis identifies three classes of groundwater: 1) Normal carbonate calcium magnesium water. 2) Contaminated water high in iron and nitrates likely of anthropogenic origin. 3) Saline water high in sodium, chlorides and potassium. Principal component analysis identifies correlations between ions indicating water-rock interactions and some contamination from human activities like agriculture. The study provides baseline data on groundwater quality in the region.

Gq2512111220

ENVIRONMENTAL IMPACT ASSESSMENT ON DAL LAKE SRINAGAR KASHMIR

IRJET Journal

This document summarizes an environmental impact assessment of conservation measures taken to restore Dal Lake in Srinagar, Kashmir. The lake is becoming increasingly polluted due to human activities. Conservation efforts have included catchment treatment, silt and sediment control, wastewater management, controlling weed infestation, improving hydrology, combating algal blooms, and solid waste management. Engineering works in over 9,700 hectares of the lake's basin and planting of over 600,000 saplings have helped reduce silt and waste. Removal of excess water and improvements to water channels and dams have also helped increase water flow and regain over 1.5 square kilometers of the lake.

D3602026041

ijceronline

International Journal of Computational Engineering Research(IJCER)

ijceronline

Briaud2001

quangmaihuy

This document describes an extension of the SRICOS method for predicting scour depth at bridge piers. The extended method, called E-SRICOS, accounts for variable flow velocities over time (velocity-time histories) and multilayer soil stratigraphy. It accumulates the effects of different velocities and sequences through soil layers to predict scour depth. The document outlines the E-SRICOS algorithms and procedures. It also presents a simplified version, S-SRICOS, and compares predictions of both methods to measurements at eight bridge sites in Texas.

Af31231237

This document discusses modeling groyne placement on river bends based on sedimentation analysis using numerical simulation with the finite difference method. The goal is to determine optimal groyne placement by considering sediment accumulation volumes in groyne fields. The study plans to simulate 450 cases combining various groyne positions, lengths, flow velocities, bend radii, and suspended sediment concentrations. Conservation equations for mass and momentum will be used to develop the mathematical model. Validation and verification processes will evaluate the agreement between experimental data and model predictions. Regression analysis of simulation results will determine suitability coefficients to obtain relationships between parameters like Froude number and groyne length, providing guidance on best distances between groynes. The numerical model aims

Modelling of a Coastal Aquifer using FEFLOW

C. P. Kumar

This document summarizes a study on modelling coastal aquifer seawater intrusion using FEFLOW software. The study area is along the coast of North Goa, India where increasing groundwater extraction is causing intrusion. The objectives are to simulate intrusion under pumping scenarios, identify sensitive parameters, and suggest remedial measures. Field investigations were conducted to collect data on groundwater levels, quality and resistivity. A 3D finite element model was set up and calibrated. Results show intrusion currently extends 290m inland but could advance farther with lower rainfall or increased pumping. Sensitive parameters include hydraulic conductivity, dispersivity and rainfall. Continuous monitoring and groundwater management are recommended.

IRJET- Parameters Affecting the Clogging of Recharge Wells in Different Soil ...

IRJET Journal

This document summarizes a study on the parameters affecting the clogging of recharge wells in different soil types. The study examined how total suspended solids (TSS) concentration and water head affect recharge well efficiency over time in sandy soil. Experiments were conducted with a model recharge well system using three water tanks. Results showed that in sandy soil, a change in water head affected efficiency from 20% to 31%, while a change in TSS concentration affected efficiency from 70% to 80%. Higher water head and TSS concentration led to a faster decrease in the flow rate from the well over time. It is recommended to use low TSS concentrations for recharging sandy soil to maintain better long-term flow.

NIO final report

Prabhas Gupta

This document provides a project report on simulating hydrodynamics and pollutant transport off the Mumbai coastal region in India. It discusses setting up and calibrating the MIKE 21 hydrodynamic model to simulate currents, tides and water levels. It then describes using the ECO Lab module to model biochemical oxygen demand (BOD) and dissolved oxygen (DO) concentrations from wastewater discharges from an outfall at Worli during the southwest and northeast monsoon seasons. The objectives are to simulate pollutant dispersal patterns under different ocean conditions and wastewater discharge scenarios.

Hydrological Risk Assessment at Praia, Cape Verde

IJEAB

Hydrology modeling became a relevant topic for the Cidade da Praia, Cabo Verde, Africa, due to negative impact risk to local population and its assets. The modeling via Geographical Information Systems (GIS) can help the decision-making process of space occupation and characterization for this type of risk. Under the municipalities of Praia, the phenomenon of flash flood is common, causing soil erosion and landslide. This constitutes a risk for the local habitat, particularly in districts with a lack of strong human infrastructures. To simulate, analyze and generate risk maps using GIS to help this county governance authorities for decision-making, thus, becomes the main aim of this article.

SWOT_Fu_2011_IGARSS.ppt

grssieee

SWOT is a satellite mission to measure global water storage on land and ocean topography with unprecedented resolution and coverage. It will observe lakes as small as 250m x 250m, rivers 100m wide, and ocean eddies with 10km wavelengths. This high resolution data will provide key insights into water budgets on land and energy transport in oceans, enabling better climate predictions and fresh water management in response to climate change. Other applications include ocean bathymetry, sea ice thickness, and ice sheet topography.

Similar to Iwan Ridwansyah Morphometricand Watershedof Lake Diatas (20)

Lake mead water management numerical model

Effects of shale volume distribution on the elastic properties of reserviors ...

Dynamic Habitat - CLLAMM technical briefing

CFD modeling

Cy24649654

Poster Presentation

Ecohydrodynamics of cold-water corals - Juan moreno-Navas

Modelling of Seawater Intrusion

Gq2512111220

ENVIRONMENTAL IMPACT ASSESSMENT ON DAL LAKE SRINAGAR KASHMIR

D3602026041

International Journal of Computational Engineering Research(IJCER)

Briaud2001

Af31231237

Modelling of a Coastal Aquifer using FEFLOW

IRJET- Parameters Affecting the Clogging of Recharge Wells in Different Soil ...

NIO final report

Hydrological Risk Assessment at Praia, Cape Verde

SWOT_Fu_2011_IGARSS.ppt

More from Hartanto Sanjaya

Kerjasama Kajian Hyperspectral OPT PTISDA - BBPOPT

Pemanfaatan Hyperspectral dalam Bidang Pertanian

Ekspose Kegiatan "Hyperspectral-OPT"

Sijampang - Sistem Informasi Hujan dan Genangan Berbasis Keruangan

Sijampang adalah sistem informasi hujan dan genangan berbasis keruangan yang menggabungkan data radar cuaca, partisipasi publik, dan metode hybrid untuk memberikan peta hujan interaktif dan informasi sebaran hujan secara real-time. Aplikasi ini memungkinkan pengguna untuk mengirimkan laporan hujan dan genangan lewat SMS atau email dari berbagai lokasi di Indonesia guna membangun basis data hujan secara kolaboratif.

Jimmy A Kadar Vol Of Water Cirata

The document summarizes the calculation of water volume in the Cirata Dam reservoir located in Cirata Village, Purwakarta, West Java. It provides data on the dam's watershed coverage area and annual electricity usage. The objective is to exhibit the volume of water in Cirata Dam, West Java. Bathymetry data from LIPI is used to convert dam bathymetry into a TIN format. The planimetric area is calculated as 173340380.082 square meters, surface area as 174075213.241 square meters, and volume as 15427350368.034 cubic meters above a base height of 120 meters.

3D Analyst Watershed Lombok

This document discusses using ArcView 3.3 to determine watersheds on Lombok Island, Indonesia. It describes Lombok's varied topography, especially in northern high mountain and valley areas. The document outlines steps to create a digital elevation model from SRTM data, calculate flow direction and accumulation, identify streams, label stream links, and determine watershed boundaries. It also mentions viewing the results in 3D using the 3Dscene extension.

3 D Analyst

The document discusses the capabilities of ArcView's 3D Analyst extension. It can create and analyze 3D shapes, surfaces, and terrain data. Surface modeling in 3D Analyst uses either grids or triangulated irregular networks (TINs) to represent terrain. Grids partition space into cells storing numeric values, while TINs use triangles connecting points with x, y, z coordinates. 3D Analyst allows visualization and analysis of 3D data including contours, slopes, aspects, areas, volumes, and visibility.

3D Analyst - Watershed

3D Analyst - Watershed Lorelindu

This document summarizes steps taken to create a geographic information system (GIS) model of watershed areas in Lore Lindu National Park, Indonesia. The steps included: (1) creating a digital elevation model from satellite data, (2) removing errors, (3) generating flow direction and accumulation maps, (4) mapping stream channels based on areas with over 500 cells of accumulated flow, (5) generating stream links, (6) delineating watersheds, (7) visualizing the 3D model, and (8) comparing generated streams to topography.

3D Analyst - Watershed from SRTM

This document describes the 7 main steps to create a watershed from SRTM DEM data using ArcGIS software: 1) Create a DEM from SRTM data and reproject it; 2) Remove sinks in the DEM; 3) Generate a flow direction raster; 4) Generate a flow accumulation raster; 5) Generate a stream channel raster; 6) Generate stream links; and 7) Generate the watershed polygons. Each step involves using different ArcGIS hydrology tools on the output of the previous step to delineate watershed boundaries.

3D Analyst - Watershed and Stream Network

A watershed is defined as the area of land that drains to a particular point along a stream. The boundary of a watershed is defined by the highest elevations surrounding the stream, and a drop of water falling outside this boundary will drain to another watershed. This document outlines steps to automatically delineate watershed areas and stream networks in ArcGIS using tools like flow direction, flow accumulation, and watershed. The process involves converting DEM data to raster format, removing sinks, and generating channels, stream links, and watersheds based on flow patterns and accumulation thresholds.

3D Analyst - Watershed, Padang

The document discusses using ArcGIS spatial analyst tools to delineate watersheds in the Padang area of Indonesia. It involves creating a digital elevation model (DEM) from SRTM elevation data, then using hydrological modeling tools like Fill, Flow Direction, Flow Accumulation, and Watershed to generate vector layers representing streams, channels, and watershed boundaries. The final watershed delineation is viewed in 2D in ArcMap and 3D in ArcScene and Cosmo Player to understand the hydrological modeling process and watersheds in the Padang area.

3D Analyst - Lake, Jatiluhur

3D Analyst