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

RE: DISSIP warning and iteration problem

GR
George Roux, modified 1 Year ago.

DISSIP warning and iteration problem

Youngling Posts: 1 Join Date: 7/27/12 Recent Posts
Hi
I am having a problem when I run Delft3d-wave. With a grid cell size of larger than 30m x 30m the model s runs normally and I only receive a warning shown below but when I decrease the size to a smaller cell size, 20m x 20m or 15m x 15m, I start having problems. The SWAN model starts the iterations normally but after the firth iteration the accuracy starts to decrease. The run ends at 30-40% accuracy even after 100 iterations.
I only receive a warning for

WARNING: Found negative value(s) for DISSIP in swanout1 file;
value(s) set to zero

Could some please help me with this problem?

Kind regards
George
MV
Monique Villatoro, modified 1 Year ago.

RE: DISSIP warning and iteration problem

Youngling Posts: 5 Join Date: 5/14/12 Recent Posts
Hi there, did you find the solution to your problem?? I am getting the same warning and don't know what to do. I would appreciate your help if you managed to fix it.

Thanks,

Monique
Philip Jayson-Quashigah, modified 1 Year ago.

RE: DISSIP warning and iteration problem

Youngling Posts: 11 Join Date: 8/13/15 Recent Posts

I am doing a nested model and I get similar warning and the model stops. Any help so far?

 

E:\DECCMA\Delf3D Model_Volta\Nested New\TestWave\Nested>rem exit 
>>...End of SWAN run
  Allocate output fields
  Read SWAN output
  WARNING: Found negative value(s) for dissip(2) in swanout file;
           value(s) set to zero
  Map WAVE parameters to FLOW grid          1
  Write WAVE map file, nest          2 time           0.000
  Time written          0

forrtl: severe (170): Program Exception - stack overflow
Image              PC                Routine            Line        Source             
wave.exe           00007FF7889E1F88  Unknown               Unknown  Unknown
wave.exe           00007FF788971F11  Unknown               Unknown  Unknown
wave.exe           00007FF7887C8903  Unknown               Unknown  Unknown
wave.exe           00007FF788761DF8  Unknown               Unknown  Unknown
wave.exe           00007FF7888FF9AE  Unknown               Unknown  Unknown
wave.exe           00007FF7889E21A9  Unknown               Unknown  Unknown
KERNEL32.DLL       00007FFC27D01FE4  Unknown               Unknown  Unknown
ntdll.dll          00007FFC27F9EFB1  Unknown               Unknown  Unknown
 

I have a service package and 3.05.04.7545M

Qinghua Ye, modified 1 Year ago.

RE: DISSIP warning and iteration problem

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

Hi Philip,

It seems to me the error message is on the model size.  Maybe the number of grid is too big, which your computer/memory cannot handle.

Pls check,

Qinghua

Philip Jayson-Quashigah, modified 1 Year ago.

RE: DISSIP warning and iteration problem

Youngling Posts: 11 Join Date: 8/13/15 Recent Posts

Thanks Qinghua

That is possible because it runs alright for the course grid alone.

I will check on it.

 

Regards

Philip Jayson-Quashigah, modified 1 Year ago.

RE: DISSIP warning and iteration problem

Youngling Posts: 11 Join Date: 8/13/15 Recent Posts

Hi Qinghua

Could I be running into memory issues still? I have reduced the model area and grids and using a time varying space varying boundary condition. The flow stand alone runs fine as with if I include sediments but once I couple with wave it initiates but hangs at the 0% time-step and nothing in the tri-diag file to help. Can you kindly take a look at the model.

I am using and i5 desktop with 16gb Ram and am using version 6.02.13.7545M

Thanks in advance

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