This study used a 2D hydrodynamic model to evaluate wind-induced sea level fluctuations in the Persian Gulf and Gulf of Oman over a 10-year period. The model was calibrated using water level measurements from two stations, with tidal levels removed to isolate the wind effect. Results showed wind drag coefficients were higher than open oceans. Extreme wind setups and setdowns were calculated for ports, with the northeast Persian Gulf experiencing over 1.5m of setup. Maximum setup maps showed southern Bahrain and areas from Doha to Dubai experienced over 1m of wind-induced water level rise.
Sinusoidal Model Development for the Study of Diurnal Variation of Surface Ai...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Examination of Total Precipitable Water using MODIS measurements and Comparis...inventionjournals
In this research, precipitable water vapor, as the most effective character in the production of biomass is estimated using remote sensing techniques. Total Precipitable Water (TPW) was estimated using measurements in the Near Infrared bands of the MODIS. To examine the level of confidence in TPW deriving, a simultaneous in situ measurement by Radiosonde and ground-based Global Positioning System (GPS) was carried out. The TPW as results in Radiosonde and GPS was accomplished using the relevant physical equations and base on wet delay troposphere, respectively. Results showed a high correlation among the values of TPW derived from MODIS banding ratio, Radiosonde and GPS data at the Mehrabad station. Also, Using the ratio of the apparent reflectance in the water vapor absorption band to reflectance in non-absorbing band, the atmospheric water vapor transparency was mapped, that the maps showed a high correlation between apparent reflectance and TPW MODIS as their statistical results showed an inverse negative relationship(R²= -0.97).
Sinusoidal Model Development for the Study of Diurnal Variation of Surface Ai...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Examination of Total Precipitable Water using MODIS measurements and Comparis...inventionjournals
In this research, precipitable water vapor, as the most effective character in the production of biomass is estimated using remote sensing techniques. Total Precipitable Water (TPW) was estimated using measurements in the Near Infrared bands of the MODIS. To examine the level of confidence in TPW deriving, a simultaneous in situ measurement by Radiosonde and ground-based Global Positioning System (GPS) was carried out. The TPW as results in Radiosonde and GPS was accomplished using the relevant physical equations and base on wet delay troposphere, respectively. Results showed a high correlation among the values of TPW derived from MODIS banding ratio, Radiosonde and GPS data at the Mehrabad station. Also, Using the ratio of the apparent reflectance in the water vapor absorption band to reflectance in non-absorbing band, the atmospheric water vapor transparency was mapped, that the maps showed a high correlation between apparent reflectance and TPW MODIS as their statistical results showed an inverse negative relationship(R²= -0.97).
Hydrographic survey is the survey of physical features present underwater.
This slide briefs you about the definition of the survey, its application, use, etc. It also discusses the sounding process used in the hydrographic survey.
This Presentation is an introduction to current meter device specially how to measure flow velocity using current meter,its types and methods used in field.
A study on comparision of runoff estimated by Empirical formulae with Measure...Ahmed Ali S D
MAIN PUPOSE OF THIS PPT PRESENTATION IS TO SELECT SIUTABLE DISCHARGE FORMULA FOR A RIVER BASIN TO ESTIMATE RUNOFF ONLY BY USING PRECIPITATION DATA ONLY. IF WE KNOW RAINFALL DATA WE EASILY ESTIMATE FUTURE RUNOFF ALSO.
Gowanus Canal Survey Report - Single Beam Echo SoundersSyQwest Inc.
CR Environmental, Inc. (CR) performed a bathymetric survey of part of Gowanus Bay and all navigable portions of the Gowanus Canal, located in Brooklyn, NY, on January 5, 2010 for Henningson, Durham and Richardson Architecture and Engineering, P.C. (HDR). The objective of the survey was to map seabed elevations within the Gowanus Canal Study Area in support of the ongoing Remedial Investigation/Feasibility Study (RI/FS). These data can be used to support volume calculations, estimates of changes in depth over time, and to assist in planning sediment sampling investigations.
This draft report summarizes the methods used for bathymetric data acquisition and the results obtained. Digital data products were transmitted electronically to HDR and CH2M Hill, Inc. on January 25, 2010 and also on a CD with the draft report submitted February 2010. Data are projected to New York State Plane (Long Island), NAD-83, U. S. Survey Feet. Seabed elevations are reported in U.S. Survey Feet relative to NAVD88 (estimated).
Single-Beam Echo Sounders (SBES)
Syqwest Inc. has a complete line of high quality affordable single beam echo sounders to choose from for Hydrographic Surveying applications.
SBES systems were developed about 80 years ago and have substantially contributed to important primary oceanographic discoveries and developments. SBES are still commonly used in hydrographic surveying. A SBES can measure only one point per acoustic echo wave (echo) emitted. The specifications of SBES are defined by beam angle and frequency of transmitted acoustic wave from the transducer as well as many other sonar parameters which may be selected in order to provide water depth capabilities from less than 1 meter to full ocean depth.
Infrared radiation associated with vapor-liquid phase transition of water is investigated
using a suspension of cloud droplets and mid-infrared (IR) (3–5 lm) radiation absorption
measurements. Recent measurements and Monte Carlo (MC) modeling performed at
60 C and 1 atm resulted in an interfacial radiative phase-transition probability of
5108 and a corresponding surface absorption efficiency of 3–4%, depending on
wavelength. In this paper, the measurements and modeling have been extended to 75 C
in order to examine the effect of temperature on water’s liquid-vapor phase-change radiation.
It was found that the temperature dependence of the previously proposed phasechange
absorption theoretical framework by itself was insufficient to account for
observed changes in radiation absorption without a change in cloud droplet number density.
Therefore, the results suggest a strong temperature dependence of cloud condensation
nuclei (CCN) concentration, i.e., CCN increasing approximately a factor of two from
60 C to 75C at near saturation conditions. The new radiative phase-transition probability
is decreased slightly to 3108. Theoretical results were also calculated at 50 C
in an effort to understand behavior at conditions closer to atmospheric. The results suggest
that accounting for multiple interface interactions within a single droplet at wavelengths
in atmospheric windows (where anomalous IR radiation is often reported) will be
important. Modeling also suggests that phase-change radiation will be most important at
wavelengths of low volumetric absorption, i.e., atmospheric windows such as 3–5 lm and
8–10 lm, and for water droplets smaller than stable cloud droplet sizes (<20 lm diameter),
where surface effects become relatively more important. This could include unactivated,
hygroscopic aerosol particles (not CCN) that have absorbed water and are
undergoing dynamic evaporation and condensation. This mechanism may be partly responsible
for water vapor’s IR continuum absorption in these atmospheric windows.
Hydrographic survey is the survey of physical features present underwater.
This slide briefs you about the definition of the survey, its application, use, etc. It also discusses the sounding process used in the hydrographic survey.
This Presentation is an introduction to current meter device specially how to measure flow velocity using current meter,its types and methods used in field.
A study on comparision of runoff estimated by Empirical formulae with Measure...Ahmed Ali S D
MAIN PUPOSE OF THIS PPT PRESENTATION IS TO SELECT SIUTABLE DISCHARGE FORMULA FOR A RIVER BASIN TO ESTIMATE RUNOFF ONLY BY USING PRECIPITATION DATA ONLY. IF WE KNOW RAINFALL DATA WE EASILY ESTIMATE FUTURE RUNOFF ALSO.
Gowanus Canal Survey Report - Single Beam Echo SoundersSyQwest Inc.
CR Environmental, Inc. (CR) performed a bathymetric survey of part of Gowanus Bay and all navigable portions of the Gowanus Canal, located in Brooklyn, NY, on January 5, 2010 for Henningson, Durham and Richardson Architecture and Engineering, P.C. (HDR). The objective of the survey was to map seabed elevations within the Gowanus Canal Study Area in support of the ongoing Remedial Investigation/Feasibility Study (RI/FS). These data can be used to support volume calculations, estimates of changes in depth over time, and to assist in planning sediment sampling investigations.
This draft report summarizes the methods used for bathymetric data acquisition and the results obtained. Digital data products were transmitted electronically to HDR and CH2M Hill, Inc. on January 25, 2010 and also on a CD with the draft report submitted February 2010. Data are projected to New York State Plane (Long Island), NAD-83, U. S. Survey Feet. Seabed elevations are reported in U.S. Survey Feet relative to NAVD88 (estimated).
Single-Beam Echo Sounders (SBES)
Syqwest Inc. has a complete line of high quality affordable single beam echo sounders to choose from for Hydrographic Surveying applications.
SBES systems were developed about 80 years ago and have substantially contributed to important primary oceanographic discoveries and developments. SBES are still commonly used in hydrographic surveying. A SBES can measure only one point per acoustic echo wave (echo) emitted. The specifications of SBES are defined by beam angle and frequency of transmitted acoustic wave from the transducer as well as many other sonar parameters which may be selected in order to provide water depth capabilities from less than 1 meter to full ocean depth.
Infrared radiation associated with vapor-liquid phase transition of water is investigated
using a suspension of cloud droplets and mid-infrared (IR) (3–5 lm) radiation absorption
measurements. Recent measurements and Monte Carlo (MC) modeling performed at
60 C and 1 atm resulted in an interfacial radiative phase-transition probability of
5108 and a corresponding surface absorption efficiency of 3–4%, depending on
wavelength. In this paper, the measurements and modeling have been extended to 75 C
in order to examine the effect of temperature on water’s liquid-vapor phase-change radiation.
It was found that the temperature dependence of the previously proposed phasechange
absorption theoretical framework by itself was insufficient to account for
observed changes in radiation absorption without a change in cloud droplet number density.
Therefore, the results suggest a strong temperature dependence of cloud condensation
nuclei (CCN) concentration, i.e., CCN increasing approximately a factor of two from
60 C to 75C at near saturation conditions. The new radiative phase-transition probability
is decreased slightly to 3108. Theoretical results were also calculated at 50 C
in an effort to understand behavior at conditions closer to atmospheric. The results suggest
that accounting for multiple interface interactions within a single droplet at wavelengths
in atmospheric windows (where anomalous IR radiation is often reported) will be
important. Modeling also suggests that phase-change radiation will be most important at
wavelengths of low volumetric absorption, i.e., atmospheric windows such as 3–5 lm and
8–10 lm, and for water droplets smaller than stable cloud droplet sizes (<20 lm diameter),
where surface effects become relatively more important. This could include unactivated,
hygroscopic aerosol particles (not CCN) that have absorbed water and are
undergoing dynamic evaporation and condensation. This mechanism may be partly responsible
for water vapor’s IR continuum absorption in these atmospheric windows.
Aria Telecom features ranges of products related to voice processing system and caters real contact center solutions to support industries or businesses in dealing easily with clients and improving business value.
It will help you to know the working of e-commerce (B2C) website .... and present the way when you make your own e-commerce website
#onlinesystem #eCommerce
Staircase is a very important interior element which needs meticulous planning and treatment .It is also a visual treat if aesthetics are considered as well.
Predavanje Vesne Vuksan održano 12. juna 2014. godine u Biblioteci Instituta za naučne informacije Vojno-medicinske akademije u Beogradu
Tema otvara pitanja iz sveta bibliotekarstva koja danas, čini se, traže odgovore više nego ikad: šta nas pokreće u okruženju koje se stalno menja? Kako iskočiti „iz kutije“ i učiniti posao zabavnijim sebi i drugima? Zašto javnost i dalje misli da svi imamo preko 60 godina i nosimo punđe? Na koje sve načine možemo da budemo čvrsta spona između korisnika i znanja? Kako iskoristiti tehnološke inovacije u ostvarenju naše misije?
Biblioteke, ta nedvosmisleno kreativna mesta, odišu mogućnostima za raznovrsna ostvarenja, samo ih treba na pravi način, i uz prave ljude, prepoznati i – ne propustiti.
A Numerical Simulation for Predicting Sea Waves Characteristics and Downtime ...Professor Kabir Sadeghi
In this paper, a numerical simulation of sea wave characteristics and operation
downtimes of offshore structures is presented. The simulation was based on available
wind data and seawater temperature recorded by an oceanography buoy installed in
the Caspian Sea. Wave characteristics were simulated for deepwater parts of the
Caspian Sea by applying the Bretschneider spectrum and equations using following
recorded data: wind velocity, wind duration, fetch length, and water/air temperature
differences. Since recorded wave data were only available for a one-year period, they
were solely used for validation of the simulation results with recorded data but for
not the simulation itself. Some practically established thresholds for wave velocity,
wave period, and wind velocity were considered as constrains, limiting the operation
of offshore installations. The numerical simulation model revealed that it is possible
to operate offshore installations for 250 days per year in the southern parts of the
Caspian Sea. A worst-case scenario showed that the maximum waiting time for
restarting the offshore installations is 17 days. Considering the swell parameter, it
was concluded that the annual downtime period of offshore installation operations in
southern parts of the Caspian Sea is about one third of a year and the maximum
waiting time for this operation is about two third of a month.
Graduation project (Excellent)
Coastal Processes Assessment and Marina Design, EL-Sallume, Egyptian North coast.
EL-Sallume new marina is a proposed project in Egyptian North Coast that aims to provide a unique experience through linking the marina with the Exterior Oases corridor.
The project consisted of four stages, The first was Metocean study including data collection, data analysis and spectral wave modelling using Mike21 SWs. The second was detailed design of marine structures. Third stage was estimating the cost of the project (BOQ). Finally, environmental impact assessment (EIA)
Wind resource assessment on a complex terrain: Andhra Lake project - IndiaJean-Claude Meteodyn
This paper presents an evaluation of the CFD software’s performance based on cross-comparisons between met masts results. It gives an approach on uncertainty values in non standard conditions: very sharp reliefs, very large domain and large distances between the masts.
In fact, the Andhra Lake wind farm is located on a very sharp terrain, where 117 out of 142 turbines fail to conform to the “complex” terrain characterization according to the 61400-1 Ed3 standard. The reference meteorological data come from a long measurement campaign with five met masts with a maximal height of 50 m/57 m. A complete assessment study including the estimation of the Long Term Annual Energy Output (LTAEO), load conditions and turbine suitability has been performed by means of the CFD software meteodyn WT.
Composite sea level prediction in the Mediterranean
Sea - comparisons with observations
By Florent Lyard and Laurent Roblou
Abstract
In this presentation, we focus on the sea level recorded and modelled in the Mediterranean Sea during the year
2002. Two dynamical models are made available to us, the first one designed to solve the ocean circulation
(Mercator Psy2-v1 (Newsletter Mercator N°8)) and the second one to solve the tide and storm surge processes
(Mog2D). We challenge the assumption that a combined use of those two models (i.e. through a full or partial
summation) should provide an optimal sea level predicting tool. By comparing with tide gauge measurements, the
predicting skills of models, alone and/or combined together, are estimated for different frequency ranges. The
two major conclusions that can be drawn from this study is that first a combination of low-pass filtered Mercator
plus Mog2D closely fits the recorded data, and second the Mog2D low frequency sea level signal is surprisingly
needed in this combination to obtain the best prediction (instead of the low-pass filtered Inverted Barometer
(IB)). Further investigations will be necessary to understand precisely the reasons of the latter finding.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
OFFSHORE WIND RESOURCE ASSESSMENT OFF THE SOUTH AFRICAN COASTLINEIAEME Publication
The world is undergoing a paradigm shift as more people are becoming aware of energy consumption patterns, reinforcing the need for developing cleaner and more sustainable ways to generate electrical energy. Globally, the development of onshore wind farms is sometimes impeded by factors such as aesthetic impact, acceptance by the public, the threats to surrounding biodiversity, noise from the power plant and possible land use conflicts. Due to these concerns, offshore wind plants have been developed. Offshore wind energy is generally greater in comparison to that of onshore wind energy because the wind speeds offshore are generally higher and more constant with fewer obstructions to the wind resource. The offshore wind potential for South African coastal regions was investigated and analysed in this study. Various factors such as shipping routes, oil and gas exploration fields and possible transmission connection points were taken into consideration before selecting four data collection sites. The predominant wind direction, mean wind speed, wind shear and spatial geographic information was analysed for each site. The sites’ wind direction did not have any similarities, with each site having its own prevailing wind directions. Within the 50 m hub height, Site 2 showed the best potential based on the power density. Site 1 and Site 3 showed similar power densities to each other with Site 4 showing the lowest power density. The distance to shore ranged from 200 km to 500 km with a steep continental shelf drop to a depth of approximately 3 000 m. The study conducted shows that there is offshore wind potential off the coast of South Africa. Energy generated by this method could assist South Africa to increase access to energy, reduce expensive transmission line losses to coastal provinces, and assist the country to transition towards a more sustainable future energy mix in line with developed nations.
DSD-INT 2019 Elbe Estuary Modelling Case Studies-StanevDeltares
Presentation by Emil Stanev (HZG Institute of Coastal Research, Germany), at the DANUBIUS Modelling Workshop, during Delft Software Days - Edition 2019. Friday, 8 November 2019, Delft.
Propeller cavitation is a major problem in ship operation and the costs of repair and maintenance is high for ship-owners. Proper design of propeller plays a very important role in life cycle and the performance of a vessel. The use of simulation to observe various parameters that affect cavitations can be helpful to optimize propeller performance. This project designs and simulates cavitations flow of a Kaplan series, Fixed Pitch Propeller (FPP) of a 48-metres Multipurpose Deck Ship at 11 knots. Simulation test was carried out for laminar and turbulent flow using Computational Fluid Dynamics (CFD) approach to observe cavitations occurrence at selected radius. The parameters considered are pitch angle, angle of attack, viscosity of sea water, operating vapour pressure in the sea water, engine power, lift and drag vectors of each of the blade sections, and resultant velocity of the fluid flow. Comparison of performance is made and it compares well with the theory. Thrust coefficient (KT), torque coefficient (KQ), thrust (T), advance coefficient (J), and cavitations number (σ), were calculated to deduce efficiency and validate the model. The study can be used to build a prototype physical model that could be beneficial for future additional experimentation investigation.
Key words: Simulation, cavitation, performance, propeller, CFD
Adequacy Check of Existing Crest Level of Sea Facing Coastal Polders by the E...IOSR Journals
The coastal embankment system has been gradually built during the last 40 years. The embankments
were originally designed to increase agricultural production by preventing salt water intrusion not to protect
against cyclonic storms. The alignment of the embankments did not consider the changing conditions in
bathymetry of the sea and thalweg migration of the rivers and therefore many embankments are located under
tidal water level and have severe toe and slope erosion problems during the monsoon season. The crest level
and embankment cross sections have not optimized the protection of hinterland and the embankment itself and
therefore the embankments typically only provide protection for the cyclones with 5-12 year return periods and
the designed crest level of the sea facing coastal polder equal to the sum of normal maximum recorded water
stage plus 1.50m. In this study to estimate the design crest level and side slope for sea facing embankment have
been established based on maximum storm surge level, wave run-up for cyclonic wave, freeboard allowing 5
l/m/s overtopping ,potential climate change impact and land subsidence. Statistical analysis of surge level and
wave run-up is carried out using Extreme Value Analysis (EVA) in MIKE Zero.
In this work the impact of the tidal wave on pollutant residence time within Nador
lagoon has been computed using an Eulerian approach and a 2D hydrodynamical model.
The model is based on the finite volume method; it solves the shallow water equations on
spatial domain that represents the Nador lagoon. The residence time has been defined
through the remnant function of a passive tracer released inside the lagoon. The renewal
capacity of the Nador Lagoon has been investigated when forced by the astronomic tide.
The influence of tidal wave on residence time has been defined by the return flow, and
computed for two scenarios during winter and spring periods.
● Comparative Study of the Aladin and Arome Wind Effect on Waves Characteristics: Application on the International Port of Algiers https://ojs.bilpublishing.com/index.php/jasr/article/view/708
● Identification of Black Dragon Forest Fire in Amur River Basin Using Satellite Borne NDVI Data and Its Impact on Long Range Transport of Pollutants: A Case Study https://ojs.bilpublishing.com/index.php/jasr/article/view/1182
● Perception and Knowledge on Climate Change: A Case Study of University Students in Bangladesh
https://ojs.bilpublishing.com/index.php/jasr/article/view/1542
● Role of Atmospheric Boundary Layer (ABL) Height and Ventilation Coefficient on Urban Air Quality- A study based on Observations and NWP Model https://ojs.bilpublishing.com/index.php/jasr/article/view/1421
Dear Mercatorians,
The time has come to talk about the second MERCATOR
prototype.
2002 marks a significant development with the
commissioning of the PAM model for operational
service. PAM (for Prototype Atlantique Méditerrannée)
offers a description of the North Atlantic and
Mediterranean regions with very high horizontal
resolution. This issue of the newsletter describes how it
is being implemented.
In addition, since the winter is now over, we’ll be
discussing winter convection with a comparison of
winter 2000/2001 and winter 20001/2002.
Naturally we have not forgotten our quiz, which has
been slipped in between the two articles.
Now that we’ve filled you in, sit back, put your feet up
and have a good read!
1. A model study of wind-induced sea level fluctuations in the Persian Gulf and the Gulf of
Oman
Mohammad Javad Ketabdari, Amin Ilia, and Mehdi Karimi
Citation: AIP Conference Proceedings 1648, 770010 (2015); doi: 10.1063/1.4912980
View online: http://dx.doi.org/10.1063/1.4912980
View Table of Contents: http://scitation.aip.org/content/aip/proceeding/aipcp/1648?ver=pdfcov
Published by the AIP Publishing
Articles you may be interested in
Wind-induced roughening of thin liquid films
Appl. Phys. Lett. 84, 532 (2004); 10.1063/1.1644335
Nonlinear modeling of jet atomization in the wind‐induced regime
Phys. Fluids 7, 964 (1995); 10.1063/1.868572
A study of recent data sets exhibiting wind‐induced ambient noise
J. Acoust. Soc. Am. 69, S95 (1981); 10.1121/1.385989
Mechanisms of wind‐induced low‐frequency ambient sea noise in the deep ocean
J. Acoust. Soc. Am. 67, S95 (1980); 10.1121/1.2018499
Wind‐induced low‐frequency ambient sea noise: Mechanism and modeling
J. Acoust. Soc. Am. 62, S38 (1977); 10.1121/1.2016161
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3. from QuikSCAT wind data in the Persian Gulf and the Gulf of Oman. The data was used to force the 2D
hydrodynamic model to determine wind-induced sea level fluctuations.
MODEL SET UP
In this case study, a 2D hydrodynamic model, MIKE21-FM-HD Flow model, was used to simulate water level.
This model uses an unstructured triangular grids system and is able to consider the wind drag coefficients as a
function of wind speed. This model is a module of MIKE Zero software, developed by Danish Hydraulic Institute
(DHI) and is based on the numerical solution of the depth averaged 2D shallow water equations [3].
The domain of study covers the Persian Gulf, the Strait of Hormoz and the eastern part of the Gulf of Oman until
the longitude E58°. In order to determine the location of boundary of the model in the eastern part of the Oman Sea,
a sensitivity analysis was performed. The results of this analysis proved that the impact of eastern boundary data is
negligible in water level modeling results in the western area of the longitude E58°, while the boundary is located at
longitude E62° or more. So, in this study, the model eastern boundary in the Indian Ocean was located at longitude
E62°. Fig. 1 shows the final model grids for studying wind-induced water level fluctuations in the Persian Gulf and
the Gulf of Oman. The mesh sizes vary from 0.01º (1km) in the near coast area to 0.3º (30 km) in the middle of the
Gulfs. More decrease in the mesh length didn’t have effect on the water levels derived from the model. Also, the bed
resistance is specified based on Manning drag coefficient. In this modeling, the Manning number was considered to
32m1/3
/s. Specifying Manning numbers in range 20 to 40 m1/3
/s didn’t have sensible effect on the results of the model.
A sensitive analyze was done in order to determine space discretization method. Fig. 2 represents the comparison
of the model results for low order and high order space discretization in Bandar Lengeh. As can be seen, the water
levels for the high order scheme are larger than the low order scheme in some peaks. So, the high order scheme was
used for modeling in this study.
FIGURE 1. Sudy domain for wind-induced water level variations in the Persian Gulf and the Gulf of Oman.
770010-2This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
151.238.165.29 On: Fri, 13 Mar 2015 07:35:12
4. FIGURE 2. Comparison of the model results for low order and high order space discretization in Bandar Lengeh.
The most important calibration parameter for the wind-induced fluctuation models is the wind friction coefficient
(drag coefficient). Some researches such as Guan et al., proposed a linear relation between the wind drag coefficient
and wind speed [4]. As the Persian Gulf is a semi-enclosed basin, the wind drag coefficient used in this model was
much greater than those which were used for usual open seas [5].
As MIKE21FM HD model could consider this linear relation, the wind drag coefficient was considered as
0.003625 for the wind speeds over 20 m/s and 0.00125 for the wins speeds under the 5 m/s. Also the linear values
were considered for the wind speeds between these extents.
The model was validated for the three of the most important storms in the measurements period. In order to
determine the water level variation due to wind in measured data, it is obliged to calculate the difference between
raw measurements and predicted tidal data. Fig. 3 shows the validation result at Kish measurements for a storm on
04/04/2007.
FIGURE 3. Model validation for wind-induced water fluctuations at Kish station for storm on 04/04/2007
CACULATING EXTREMES FLUCTUATIONS
In order to determine extreme values for wind setup and Wind set-down, water level fluctuations induced by
wind were extracted from the model for different important ports and cities in the region. For instant, one of the
important ports in northern coasts of the Persian Gulf is Bandar Lengeh. Water levels were extracted in front of
Bandar Lengeh. An extreme value analysis was performed on this set of data by the EVA toolbox in MIKE Zero.
Table 1 represents final results of wind setup and set-down. Similar processes were carried out to determine extreme
wind setups and set-downs for other important ports and citied in the Persian Gulf and the Gulf of Oman, such as:
Jask, Bandar Abbas, Bushehr, Kuwait, Doha, Abu Dhabi, Dubai, Fujairah and Muscat.
770010-3This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
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5. TABLE 1. Wind setup and wind set-down for different return periods in Bandar Lengeh
Return Period (yrs.) Set Up (m) Set-Down (m)
2 0.35 0.36
5 0.44 0.45
10 0.51 0.51
20 0.57 0.57
50 0.66 0.65
100 0.73 0.72
RESULTS
The 2D hydrodynamic modeling was carried out for a 10-years period (1999~2009) to determine wind-induced
water level fluctuations. Extreme fluctuations were calculated by extreme value analysis for important coastal cities
and ports in the Persian Gulf and the Gulf of Oman. Fig. 4 represents the location of the cities and ports which were
considered for extreme value analysis.
In addition, maximum setups for different part of the Persian Gulf and the Gulf of Oman were presented. Fig. 5
shows maximum wind-setups in the Persian Gulf and the Gulf of Oman. It is evident in this figure that the wind-
setup at the northeast of the Persian Gulf (from Kuwait to Hendijan in Iran) is more than 1.5m. Kuwait, Faw, Um
Qasr, Bubian Island, Arvand-rud and Imam Khomeini port are the areas where wind-setup must be considered as
serious factor in design of coastal structures. Also, the southern areas of Bahrain have a high maximum setup level
induced by winds. The maximum setup levels in these areas are exceeded than 1.5m. Many construction projects
have been doing in the coastline from Doha to Abu Dhabi and Dubai, where the wind setup levels are higher than
1.0m. Therefore it’s so important that designers consider the wind induced fluctuations in this region.
FIGURE 4. Important cities and ports in the Persian Gulf and the eastern part of the Gulf of Oman
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6. FIGURE 5. Maximum wind-Setups in the Persian Gulf and the Gulf of Oman
CONCLUSIONS
Tide is the main and continual factor in water level fluctuations in the Persian Gulf and causes a water level
fluctuation between 1.5 to 4.5m in different parts of the Persian Gulf [6]. Some studies have been performed in tidal
level fluctuations in the Persian Gulf. Wind setup and wind set-down are the second dominant factors in water level
fluctuations in the Persian Gulf, which have not been studied enough in this region yet. This study focused on the
wind-induced water level fluctuations in the Persian Gulf and the Gulf of Oman by modeling this phenomenon for a
10-years period. The model was calibrated and validated by separated wind-induced water levels from measured
data. The wind drag coefficient, obtained in calibration process, is much larger than usual wind drag coefficient
which is used for oceans and non-closed seas. The results show that extreme wind-induced water levels, in the
Northwest and Southeast of the Persian Gulf, are much higher than other places in this region.
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