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# Hydrodynamic Modeling - Science topic

Explore the latest questions and answers in Hydrodynamic Modeling, and find Hydrodynamic Modeling experts.

Questions related to Hydrodynamic Modeling

I want to use a hydrodynamic model to simulate the dispersal of plastic along a coastline. This can be done using the 2md generation SLIM model (https://git.immc.ucl.ac.be/slim/slim). However, it is Python based and I was hoping anyone might know of an R based alternative? Or will I have to bite the bullet and learn Python?

Any recommendation for open-source and free alternatives would be much appreciated.

I am trying to learn how to use EFDC+ 8.5 to model an estuary, it has to be efdc+ because the hydrodynamic model is in EFDC+. I do not have access to the EE GUI. I haven't been successful in compiling the source code to run yet and was wondering if anyone out there has successfully run EFDC+ using visual explorer.

If so, what resources did you use to learn how to so it?

I'm finding a 3D hydrodynamic model that considers the processes of water & sediment quality and sediment transport at the same time.

Delft3d seems to be a good one, as Delft3d-WAQ couples the deposition of organic matters and sediment transport and wave can be computed as well.

SCHISM seems to be another good model system as it contains all needed module, however, I'm not sure if it can work as Delft3d-WAQ.

Therefore, I want to ask:

1. Is SCHISM okay for the above requirements (considering the processes of water & sediment and sediment transport at the same time)?

2. Is there any other models that meet these requirements?

Your help will be the most grateful.

Currently I'm working on a project related surface ship simulation. We need to simulate a plenty of ship types. I modeled propeller, rudder etc. But hydrodynamic forces are modeled as hyrodynamic derivatives (hyrodynamic coefficients, maneuvering coefficients ). For some ships, we generate our hyrodynamics data, but as I said, we need lot more. We dont want to spend time on CFD. We need direct data of Hydrodynamic of some ships. Is there such a company/institute/university/organization etc.? Any suggestion?

The question is about hydrodynamics and coastal water quality modeling.

Hi everyone, I've been running this Sdevice code to obtain a 14 nm finFET thermal simulation, but the results doesn't match with the expected. Do you have any suggestions or tips that I could use to run this simulation? Thanks in advance.

#==================================================

# dessis.tpl

#

# for use with run_dessis.tel

#==================================================

#setdep @node|iClassDDmodToxWf@

#setdep @node|xreflect@

#define _Hmodel_ Hydrodynamic(eTemperature)

#define _EQUATIONSET_ Poisson Electron Hole eTemperature Temperature

#define _QC_ eQuantumPotential

File

{

Grid= "n@node|xreflect@_reflectx_msh.tdr"

Piezo= "n@node|xreflect@_reflectx_msh.tdr"

Parameter="@parameter@"

Current= "@plot@"

Save= "@save@"

Plot= "@tdrdat@"

Output= "@log@"

}

electrode {

#if "@Type@" == "nMOS"

{ name=gate voltage=0.7 }

#else

{ name=gate voltage=-0.6 }

#endif

{ name=substrate voltage=0}

{ name=source voltage=0 Resistor=40 }

{ name=drain voltage=0 Resistor=40}

}

Thermode{

{ Name="substrate" Temperature=300 SurfaceResistance=1e-4 }

}

Physics{

_Hmodel_

_QC_

RecGenHeat

AnalyticTEP

ThermalConductivity()

Temperature=300

EffectiveIntrinsicDensity( BandGapNarrowing(OldSlotboom) )

Mobility(

DopingDep

eHighFieldsaturation( CarrierTempDrive )

Enormal(Lombardi)

)

Recombination(

SRH( DopingDep TempDependence )

)

}

physics(Material=SiliconGermanium){

Piezo( Model( DeformationPotential( minimum ekp hkp )

DOS (eMass hMass)

#if "@Type@" == "nMOS"

mobility(esaturationfactor=0.0 efactor(kanda sfactor=MCmob(Type=0)))

#else

mobility(hsaturationfactor=0.0 hfactor(kanda sfactor=MCmob(Type=1)))

#endif

)

Stress=(@Sxx_Pa@,@Syy_Pa@,@Szz_Pa@,0.0,0.0,0.0)

)

mobility (

highfieldsaturation

Enormal(Lombardi(AutoOrientation) )

PhuMob

)

EffectiveIntrinsicDensity ( Slotboom NoFermi )

Recombination ( SRH(DopingDep) Auger )

}

Math {

-CheckUndefinedModels

Method=blocked

Submethod=pardiso

Digits=6

Extrapolate

Derivatives

Iterations=50

Notdamped=50

NumberOfThreads= 8

-ExitOnUnknownParameterRegion

ExitOnFailure

}

Plot{

*--Density and Currents, etc

eDensity hDensity

TotalCurrent/Vector eCurrent/Vector hCurrent/Vector

eMobility hMobility

eVelocity hVelocity

eQuasiFermi hQuasiFermi

*--Temperature

eTemperature Temperature *

*--Fields and charges

ElectricField/Vector Potential SpaceCharge

*--Doping Profiles

Doping DonorConcentration AcceptorConcentration

*--Generation/Recombination

SRH Band2Band * Auger

AvalancheGeneration eAvalancheGeneration hAvalancheGeneration

*--Driving forces

eGradQuasiFermi/Vector hGradQuasiFermi/Vector

eEparallel hEparallel eENormal hENormal

*--Band structure/Composition

BandGap

BandGapNarrowing

Affinity

ConductionBand ValenceBand

eQuantumPotential

}

#if "@Type@" == "nMOS"

Solve {

*- Build-up of initial solution:

NewCurrentPrefix="init_"

Coupled(Iterations=100){ Poisson _QC_ }

Coupled{ _EQUATIONSET_ _QC_ }

*- Bias drain to target bias

Quasistationary(

InitialStep=0.01 MinStep=1e-5 MaxStep=1

Goal{ Name="drain" Voltage= 0.7 }

) { Coupled { _EQUATIONSET_ _QC_ } }

}

#else

Solve {

*- Build-up of initial solution:

NewCurrentPrefix="init_"

Coupled(Iterations=100){ Poisson _QC_ }

Coupled{ _EQUATIONSET_ _QC_ }

*- Bias drain to target bias

Quasistationary(

InitialStep=0.01 MinStep=1e-5 MaxStep=1

Goal{ Name="gate" Voltage= -0.7 }

) { Coupled { _EQUATIONSET_ _QC_ } }

}

#endif

**Discussion of the state of art on the application of the Ertel's potential vorticity theorem in atmospheric physics & physical oceanography.**Prof. H. Ertel generalized Rossby's work proposal of 1939. Prof. Rossby firstly proposed that instead of the full three-dimensional vorticity vector, the local vertical component of the absolute vorticity is the most important component for large-scale atmospheric flow.

Via an independent paper published in 1942, Prof. Ertel identifying a conserved quantity following the motion of an air parcel proved that a

**certain quantity called the Ertel potential vorticity is also conserved for an idealized continuous fluid.**Several links to check on the topic powered by ResearchGate:

I am very new in hydrodynamic modeling. Recently, I have done a simulation in SMS-SRH 2D. Now, I want to perform calibration and validation of my model. But, I have no basic on calibration and validation. Can anyone give me some documents or tutorial or guidelines on calibration and validation of numerical model which will, not only build my basic but also make me able to perform on my existing simulation?

Some specific questions:

1) What are the parameters need to be used for fine tuning of model during calibration?

2) If I have limited observed data, will model give satisfactory result?

3) During validation, shall I use different cross section of another time period for my model domain?

Hello I want to model the Upwelling phenomenon in the northern part of the Oman Sea Which model or models do you think I should use?

also

I want a model that is not yet complete and can be upgraded

I want to use standard sandpapers of different grit sizes to impart flow resistance to a surface. I am wondering how to convert the roughness of sandpaper to an equivalent sand-grain roughness. Is there any established correlation between grit size and equivalent sand-grain roughness?

Hello everyone. I have a question about microfluidic-based methods. In this article, "Microflidic-Based Approaches in Targeted Cell/ParticleSeparation Based on Physical Properties: Fundamentalsand Applications", It has been mentioned that flow rate in methods with external force fields such as electric field, optical field,etc. are relatively low compared to fluid dynamics-based microfulidic separation methods such as Pinched Flow Fractionation, Deterministic Lateral Displacement, Inertial Method, etc.

My question is that why the flow rate in methods with externally applied forces is relatively low compared to fluid dynamics-based microfulidic separation methods?

Thank you for your time.

I just wish to know if there is any reference for treatment of islands/large sand patches/sand bars in rivers of width greater than 1 KM in 1D hydrodynamic models. Such kind of studies can be easily done in 2D hydrodynamic models however, but I am interested to know how such situations have been treated in 1D hydrodynamic models in past literature.

One way which I can think is to imagine a reduced cross section of the river by combining the width of river's distributaries on either side of the island and also taking its cross section as an average of the cross section of rivers on either side of the island. However, this could introduce several uncertainities.

I have run a hydrological & hydrodynamic model of a river system for 72 hours time lag using MIKE 11 software. When I evaluate the performance of the model for 24, 48 & 72 hours, the R square value is coming 0.78, 0.38 & 0.39 and Nash Sutcliffe Coefficient (NSC) value 0.73, (-) 0.49 & (-) 0.79. How we can explain the negative value of NSC?

Dear colleagues! In the laser powder-bed fusion (LPBF) process, the vapor pressure plays a significant effect on the spatter and keyhole pores formation. Unfortunately, there are few publications that show the measured or simulated vapor pressure. So what is the general magnitude of the vapor pressure in the LPBF process?

In metals, the outermost conduction electrons (electron plasma) interact with incident photons and according to the classical Drude model, they may resonate and build up longitudinal plasmonic waves either in bulk or surface depending on photons' energy. Similarly, high doped semiconductors and in some cases an intrinsic semiconductor like InSb can support these collective oscillations. But, based on our knowledge, we have both electrons' and holes' plasma in semiconductors which can interact with external perturbations like photons. Hence, why we consider only the electrons share in the plasmonic response of semiconductors?

I am trying to run a coupled model (HD and SW MIKE 21), for a one year period (8760 time steps; 3600 time step interval). However, after approx 200 time steps there is an Abnormal Run error, 'Blow-Up wave height too large'. What are some reasons that would cause this, and some solutions?

There is a categorization for Hydrological Models which divides them into three groups: Empirical models, Physical Models and Conceptual Models.

The question is: Where exactly "Hydrodynamic Models" stand within this categorization?

Are those three types related to rainfall-runoff models and Hydrodynamic models are within a different group?

Or Hydrodynamic Models can be a combination of those three types (i.e. a combination of Empirical and Conceptual Models)?

"Error No 16 : In the Boundary file a boundary is defined in BRAHMAPUTRA : 66.600 meter. This location is not specified as an open boundary in the model setup.".What might be the error and in which parameter?

Does anyone could give information (web site link) about some free softwares for coastal hydrodynamic modeling?

Thank you

I am interested in hydrodynamic modelling, more specifically, I want to model riverine and coastal processes (i.e., discharge and surge/tide) to assess compound flooding effects in estuarine environments. I am relatively new to MIKE. Can MIKE handle this? If so, can anyone suggest related literature?

Thanks in advance

We want to model hydrodynamics and currents in any sea and shallow water region. And also, we want to model rip currents and storm surges in shallow water.

I have run the model so many times with different spectral values. I have checked whether my projection is correct. Every single time the model shows output as a mirror image of the scatter dataset.

I want to know if Ansys Fluent is an appropriate tool for modeling river bed sediment transport which is a frictional particulate flow regime rather than a collisional regime such as fluidized bed. Fluent has a DDPM-DEM model that can be used, however, I couldn't find any studies that have been used Fluent for this purpose. Thanks

As they both follow Reynolds euqation and the same elastic deformation law, is there difference between the numerical model of them?

I want to do a numerical study of ship propeller. I can make a random 3D propeller model using CAD softwares. But is there any recomended propeller models or detail information of any propeller geometry - blade shapes, angles, dimensions etc?

I have question about flood water quality when river water over bank. I use PCSWMM (2D) to simulate flood and water quality in urban area. It is working well with flood from junctions (manholes) which I create from 1D model (SWMM).

In order to simulate the flood when river water over bank, outfall boundary is created in 2D. However, 2D only shows result of flood depth at flooded cells. But not the flood water quality for these cells. (I think since 2D only simulate for flood extend, not water quality).

In this case, what should I do if I want to know the flood water quality in the cells flooding by river water over bank?

I have some ideas like: assuming the flood water quality equal to river water quality. Or create more outfalls in 1D that are linked to the junctions close to boundary. But I am not very sure.

I am a beginner with hydrodynamic model, please give me some advice. Your suggestion is very much appreciated. Thanks in advance.

X values in the Muskingum parameter ranges between (0 to 0.5) and it represents wedge storage. K is the time of travel between the inflow and outflow. Is there any possibilities to estimate K without flow data and with the support of other data.

My sentaurus simulation of solar cells usually don't converge at the part after the illumination.

So before the doesn't converge part, the last successful part is the finishing of Raytracing part:

Summary of RayTrace Total Photons and Powers:

Input Escaped StoppedMinInt StoppedDepth AbsorbedBulk

Photons [#/s]: 7.392E+17 7.076E+17 2.989E+03

...

...

And then the next part is:

Starting solve of next problem:

Coupled ( Digits : 5, Max. #iterations : 30,

Solver : blocked decomposition,

#undamped iterations : 100

)

{ Poisson Electron Hole }

===============================

Computing Coupled( 1 poisson-equation(s) , 1 current-contact-equation(s) ,

1 electron-equation(s) , 1 hole-equation(s) )

using Bank/Rose nonlinear solver.

...

...

Finished because...

|RHS| increased to by more than 1e10.

So can someone tell me what is the problem here? I mean which part of the program is having problem and what kink of problem it is?

In Groundwater flow problems, the flow equations are linearized using different linearization techniques. Is it possible to apply some kind of linearization technique to soute transport model?

Is there a method available in HEC-HMS,SWAT or any other tool ?

We have 30m DEM but hte storm water drains are not seen due to corse resolution could anyone tell me a method to fuse the storm water drains into DEM.

I have numerous grid-based result from flood-numerical modeling as a float number. I will use it for the next analysis, and I consider to round it to two decimal digits.

Is it necessary to consider some rule to round off a value number of numerical output (floating number) with no error information?

Can it be considered based on the accuracy of measurement in recent gauge development (i.e. discharge gauge in-site observation)?

And how is such practical method in the field of hydrological modeling?

Hello,

I wanna conduct the research on river water tempeature modeling for impact assessment on aquatic ecology. Such model could be based on data from hydrological and hydrodynamic model. I know there exists many water temperature models or softwares. Is there any one that can be used to simulate river water temperature for a whole watershed at reach scale or cross section scale?

hello

I am trying to create a 3d model using feeflow. I have data concerning the soil profile taken from in-situ testing. Does feflow create a 3d model of the subsoil using the input data that I have ?

i.e: does it predict a probable soil profil with variable soil properties or should I define each layer ?

thank you

I studied the stationary problem of a one-dimensional bipolar hydrodynamic model of semiconductors.

Then I want to consider the SRH term (see page 9 of the following paper) for the above problem.

Conference Paper Uniqueness of Stationary Solutions to a One-dimensional Bipo...

Do you know the results of the stationary problem of a one-dimensional bipolar hydrodynamic model of semiconductors with "SRH term" and large doping profile?Can someone explain what are the key differences in a hydrodynamic model like MIKE 3 FM and using a CFD model? Is it only about the resolution/ accuracy of turbulence and eddy calculations? Or is there more to it? Thank you

Hi everyone

I am looking for some studies or books in (metal or coal)

**pit lakes**that have summarized (if possible) the**combined effect of oxygen physical entertainment into bottom thermal zones (eg monimolimnion) and the impact of biogeochemical processes**(eg methane, ammonia and hydrogen sulfide oxidation).Most studies seem to assess these two processes separately or by hydrodynamic modelling. While the latter helps, modelling requires continuous validation. I would be interested in (field) studies integrating both mechanisms to asses the oxygen dynamics (i.e oxygen supply vs oxygen demand).

A great example of what I am looking is:

Thanks – hope to get an answer soon

Daniel

My current research compares the detailed performance of two widely used hydrodynamic models. Our study include more than one thousand simulations by each model to see how the stratification dynamics is influenced by the future climate warming and reservoir management. Could anyone recommend me some journals for submission?

The impact factor should be around 3 to 4. Because my research mainly focused on the water temperature and didn't include other ecological indicators (e.g. nutrients, oxygen and algae), I supposed it may not be appropriate to submit to the enviromental journals (Science of the Total Environment, Journal of Environmental Sciences and so on).

Any suggestions will be highly appreciated! Many thanks!!

Hi guys, I am currently building a mathematical model for simulating cable motions underwater. It involved a partial differential equation.

However, I am not really familiar with using Matlab. Is there have any tutorial or examples you can suggest? I will appreciate if you could give any advice.

Thank you for your time.

Ps. It is attached the partial differential equation and related article.

Dear respondent,

for given configuration of five sphere sand particles in two rows.

mathematically modelling of sand particle(dia =0.5mm) movement in sand bed under hydro dynamic drag force, which resisted by friction between the particles and self weight of the particles. How to find the distance moved?

want to find the energy required to move the particle in rough bed and smooth bed condition.

I am almost always working on a catchments without river discharge. I am trying to think of a smarter way of calibration the rainfall-runoff (RR) model. Common practice has been to calibrate nearby catchment with data and transfer the parameters. Has anybody tried to use the hydrodynamic model to calibrate the RR model?

In ANUGA, a hydrodynamic model.

**I need to define a boundary line. But How to make a dictionary 'boundary' that stores the edges on the boundary?**There is an inbuilt boundary available for the predefined rectangular domain.

**But I have to define a boundary line for my real problem domain.**Your answer will help me to progress in my project, Please reply

Also if required

**refer the pages I mentioned below**in the**attached manual**, hoping helpful to get extra clarity.Page - 7 To get general idea

Page - 9 How boundary conditions are assigned?

Page - 41 onwards To know meshing

Thank you all

I have compiled waveDyMFoam successfully (OpenFOAM 2.4.0).

But when I use the solver to simulate a free floating ship model in regular waves (only heave motion allowed), the velocity of the ship increases rapidly, making the running process crashed.

Has anyone solved the problem??

Considering ensemble based forecasting of let's say stream flow, which one is better; a forecast with high ensemble spread or low ensemble spread. Its a bit ambiguous: low ensemble spread could mean that all the ensemble members are agreeing and the forecast could be more close to reality but it could also miss the real value by big amount. On the other hand, high ensemble spread could mean that there is high uncertainty but the real value could be forecast within a the ensemble range. So what is a better forecast, high spread or low spread?

In a plug flow tubular reactor, what is the relation between the peclet number for high and low dispersion, N-CSTR in series, and residence time?

Practically, what Pe values are generally obtained for a tubular reactor or columns when operated in upflow direction?

Hello,

I am trying to make a simulation with HEC-RAS in 1D/2D. I only have the topographic and bathymetric sections for some of the river reaches. There is a scientific method for estimating the geometry of river sections for the reaches without the geometry based on river section of other reaches of the river?

In my case there is a area that is a estuary, however I don't have also the bathymetric/topographic data for this area. There is any method for estimating this based on SRTM data for example or other information?

Does anyone know about the accuracy of sediment simulation in HEC-RAS?

Can anyone suggest a software capable of simulating stability of breakwaters? I am actually conducting study on rockmounds as oyster bed. The mounds are also acting like a breakwater and so I want to know what arrangement and shape will result into better stability, good water circulation and manage sediment accumulation.

I am having a LOT of bother with this and am hoping for some suggestions.

I have had an experiment run in a flume with a pier that has a cylindrical bar attached to the front of it - a little below the surface of water - in order to model the effect of 'debris' (represented by the bar)

I cant think of a sensible way to do this, is it even possible?

please help

Hi everyone,

Ansys workbench has its Aqwa module to do hydrodynamic analyses of structures. Mine is an offshore structure with a moonpool and I already determined the RAOs (Response Amplitude Operators) of the structure in different wave conditions. What I need is the

**RAO of wave elevation**(free surface elevation) of water inside the moonpool.Does anybody in the forum know how to calculate it using Ansys Aqwa?

MIKE21 HD (FM and rectangular grid) can model the tsunami waves. I want to use the flexible mesh. To generate the surface file MIKE Tool Box is required, this tool box is accept dfs2 file only but the MIKE 21 Flexible mesh can export dfsu file. How can I convert this dfsu file to dfs2 file as an input for MIKE Tool Box to generate the surface file. Any suggestion please.

Thanks

Shams

To model river discharges and water levels, a hydrodynamic model is used that divides the river network into reach segments. Inflow boundary conditions are required as inputs to the hydrodynamic model. To determine this inflow boundary conditions, a lumped rainfall-runoff model is used to estimate the catchment discharge at the outlet. The question is how to disaggregate this lumped catchment flow (result of the rainfall-runoff model) into inflow boundary conditions along the river network (hydrodynamic distributed model)? More specifically in low land areas where flow inputs are not well defined by tributaries?

Hello guys.

I'm building a 1D hydrodynamic model in

**steady flow**in HEC-RAS 4.1 software, but my question applies to the theory and not the use of the software.For

**subcritical regime**(Froude Number <1), I must define only boundary conditions downstream and, if supercritical, I define only the amount correct?But my main question is: if

**subcritical**, the downstream conditions must be the**Rating Curve**or**Known Water Surface**? I see in some literatures claiming to be only the Known W.S, when downstream boundary condition (subcritical regime).Dear Colleagues, I am developing an analytical model for computing the internal wave celerity in a linearly density stratified fluid in a circular cross-section channel, i.e. in a bounded domain. The solution for a rectangular cross-section channel is given in Baines, 1997 (see the attached pdf for the complete reference). I have used some results by Yih (1980) referred to a full circle cross section. These results map the circle into a rectangular domain and found a solution in terms of Mathieu functions. The results by Yih did not give the dispersion relation of the waves, but it is straightforward to evaluate such a dispersion relation, at least for the long wave approximation, see the attached pdf. A further step is to consider a half-circle cross section with a lid at the top, since my experiments are in a circular cross-section channel half filled. To tackle the problem, I have used the same transformation used by Yih, but changing the rectangular domain (see after eq.25 in the attached pdf). Then the same expression in terms of Mathieu functions for the full filled circle is recovered and with further computations I obtain the same dispersion relation already obtained for the full circle. This is somehow disturbing me, in the sense that it seems that in the long wave approximation the internal wave celerity assumes the same value for the full circle and for the half circle cross-section channel. I would appreciate your comments on this point. Thanks Sandro

Hello all,

I have read that the CPU simulation time is not linear function of number of SPH particles, but rather the CPU time increases with the number of SPH particles as NlogN. I tried to find this by carrying out same Simulation but with different number of SPH particles and have plot the graph for the same. Please find the attachment and tell me if it is a valid result.

Thanks...

Now i am generating a DSM for Hydrodynamic Modelling so need what is RPC and what is important RPC for Cartosat-1 data.

Local running is impossible for 3Di hydrodynamic model. Is it possible for other models such as SOBEK, IBER; HEC-RAS 5.0 and Delft3D-Flow? Thanks in advance.

I'm performing a simple TCAD simulation in Sentaurus 2D Device. As long as I was using Hydrodynamic transport, Lombardi model and SRH recombination, my simulations were converging. Now, when I added density gradient model, my simulation does not converge because of a large |RHS|. I'm doing 20 iterations, InitialStep=1e-3 Increment=0.01 MinStep=1e-5 MaxStep=0.1 targeted to 0.8V. How can I have a successful convergence?

Please explain the following attached figure which shows the transverse wave cut at y = -0.1, -0.2, -0.3 respectively.

I am working on EHD (electro hydro dymanic) and i understand i have to use UDF in fluent for EHD, but I dont khow what udf is and how to use it for fluent.

Is it possible for me to use 1D2D hydrodynamic model for generating river reservoir or dam to study the flood impact on studied area before and after built reservoir or dam?

Hi, we are using the Caughey Thomas model in Sentaurus to simulate the electro-thermal characteristics of a one channel GaN HEMT and we made the simulation succesfully converged with hydro; but we could not see the current drop with high drain voltages in drain current, that is self heating effect. We also tried different approaches like using the both first and second formula in Canali model. However, none of these attemtps were enough to see the current drop at high drain voltages. What other model(s) can be used to see the self heating effects for GaN HEMTs in Sentaurus TCAD?

I am wondering if velocity in formula means average velocity of fluid passing through cavitator, or velocity of fluid within the cavitator, between points with different pressure?

Im conducting a hydrodynamic simulation in a highly dynamic lagoon/wetland which have constant changes in coastline structure and vegetation. After comparing with other open source application, the closest to current observation is google earth.

Is it advisable for me to use a digitize coastline of google earth for my simulation for research purpose?

and do i need to do some validification or any correction on the digitized coastline image in order to improve its accuracy. Please state some of the method used.

Thanks a lot in advance.

What should accuracy level of efficiency test of hydro-electrical turbine be?

The question is for both model test and field test. I need this for preparing specifications for those tests. I am asking guarantee for weighted average efficieny value and I want to to be able to determine if this guarantee is fulfilled or not. Of course economy and practicality under the existing level of technology are important.

(the net head is 150m, the flow is 25 cubic m /sec).

Best Regards

I modeled the pipeline system in the waterGEMS software. In this model I have a pipeline with length of 50 KM. We need 722 lit/s in this pipeline. At the Kilometer of 10+000 to 15+000 the ground elevation is higher than the HGL. The program alarm the negative pressure in this location but the discharge flow is desirable and equal to 722 lit/s. Is this possible or it is the program errors?

In this distance the maximum ground elevation is 1632 m and the HGL in this point is 1629 m.

Im working on a hydrodynamic model simulation in a local and small scale area that requires bathymetry input as part of its model setup. I do not have sufficient equipment and resources to do survey using eco sounder or any other modern techniques.

A method suggested to me is to measure the water depth and its GPS around my study location could be then be plotted in Arcgis to produce its bathymetry. I would like to know what is the advantage/disadvantage to this method and its accuracy/sensitivity. Please do recommend other method/work/paper that is applicable for my problem as well. Just to inform, i will be taking current speed, salinity and tide(tide gauge) data as well.

Thanks a lot in advance for the recommendation and advice.

Currently I am working on CFD simulations of hydrodynamics of 2 phase bubble column reactor through FLUENT.

Dear all, I want to model some streamwater quality variables (e.g. DO, TSS) using data driven models.

Which of water quality variables can be extracted using satellite images?

Thanks

Since 2 months I am trying to catch alga on agar BG-11 (Stanier i in., 1971) and f/2 (Guillard, 1975) using Viable Microbial Cascade Impactor (Tisch Environmental). And I have collected just one dead diatom.... I do not take samples during windy or rainy weather. In the water I can easily see blooms of phytoplankton. The hydrodynamical model (http://model.ocean.univ.gda.pl) shows the level of phytoplankton on average equal to 60 mg / m3. The sample is collected by the hour. Mushrooms are many, algae zero.

Have you any idea where there is a misteake?