intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

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Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

Problems with dtheta and wave forces in WAVE Model (rev. 2514)

SI
Sasha Izru, modified 7 Years ago.

Problems with dtheta and wave forces in WAVE Model (rev. 2514)

Youngling Posts: 21 Join Date: 9/16/12 Recent Posts
Hi modelers,
I’m running a wave propagation, using the WAVE module and Delft 3d revision 2514. The simulation mode is stationary and the wave conditions are recorded in time series file. For this reason, I used a wavecon file with 337 timepoints.

The problem, that I had, occurs during the WAVE execution. Around the 250 timepoint, the simulation is aborted and a message told me:
Error: SWAN file PRINT contains ERRORS

In order to know what it would be the error, I reviewed the PRINT file and I found the next message:
** Error            : distribution too narrow to be represented properly
Advise: choose Dtheta <    9.367 degr

Question 1: May anybody explain me, please, what does this message mean? I would have to change my spectra values or should I modify the directional angle of this wave condition?
I’m attaching my mdf, print and wacon files.

A second question…
The first time that I tried to run the wave model, the next messages were displayed:
.
.
.
SWAN_INPUT: [Processes] Wave Forces is set to dissipation 3d
TO switch on radiation stresses: "WavesForces = radiation stresses <2013"
.

And it was aborted the simulation.
I added the “<2013” to WavesForces parameter and I didn’t have more problems.
My 2nd question is: <2013 is related a new formulation or why the reason to add this number?

Kind Regards.
Qinghua Ye, modified 7 Years ago.

RE: Problems with dtheta and wave forces in WAVE Model (rev. 2514) (Answer)

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Sasha,

To your 1st question, I didn't see anything strange in the mdw file. Need more info to analyze.

The 2nd question, yes, we recently updated the wave-current interactions to 3D. Refer to the flow manual Section 9.7.1. The default setting of wave forcing is not radiation stress but 3D dissipation.

Regards,

Qinghua
SI
Sasha Izru, modified 7 Years ago.

RE: Problems with dtheta and wave forces in WAVE Model (rev. 2514)

Youngling Posts: 21 Join Date: 9/16/12 Recent Posts
Hi Qinghua!

Thank you for your support!

About the first question, I did a test case with the same wave time series and mdw file, but now I used a .bcw file.
Of course, I did the modifications that require the mdw file due to use the .bcw file.
The interesting point was the WAVE simulation ended in the same time point where my simulation with wavecon file ended, too.
For this reason, I reviewed my data in order to find out what it's wrong with my wave record, but I didn't notice any possible wrong data.
Could it be that I'm using a wrong parameters in my mdw file?
In order to facilitate the recognition of a possible mistake in my simulation files, I sent your Deltares email, all the files of my first wavecon-simulation (grd, dep, enc, bat, mdw, prt, etc).

And... the second question.
Thank you. I got it!.

Qinghua, I really appreciate your support. Thank you!

Kind regards

S.
Qinghua Ye, modified 7 Years ago.

RE: Problems with dtheta and wave forces in WAVE Model (rev. 2514)

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
OK... I will check the files.
SI
Sasha Izru, modified 7 Years ago.

RE: Problems with dtheta and wave forces in WAVE Model (rev. 2514)

Youngling Posts: 21 Join Date: 9/16/12 Recent Posts
Hi Qinghua!

You are, right! My wave record has some unusual values in ms. As you said it, if I change some of these values, for some in the range of 30° to 60°, I don't have problems with the simulations.

Thank you, so much Qinghua!

Kind regards.

S.