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

Is there a minimum size of grid?

JT
Javier Tercero, modified 8 Years ago.

Is there a minimum size of grid?

Padawan Posts: 26 Join Date: 10/8/12 Recent Posts
Hello all,

My .xyz file is in UTM coordinates, but all data are divided by 10e-6. When I create a grid with a size of 0.001x0.001 (1000x1000m), I do not have problems to running SWAN, but if I create a grid with 0.0005x0.0005 (500x500m), i can not run and I get this message:

Performing wave computation for: caso1.swn
1 file(s) copied.

SWAN is preparing computation

1 file(s) copied.
1 file(s) copied.

C:\Users\jabanadestercero\Desktop\perranporth>rem exit
>>...End of SWAN run
*** ERROR: file 'norm_end' expected to signal a correct SWAN calculation


Why??

Thanks in advance!!
JT
Javier Tercero, modified 8 Years ago.

RE: Is there a minimum size of grid?

Padawan Posts: 26 Join Date: 10/8/12 Recent Posts
Hello,

Can anyone run my file? I want to know if it is my computer fault.

Regards
Bert Jagers, modified 8 Years ago.

RE: Is there a minimum size of grid?

Jedi Knight Posts: 201 Join Date: 12/22/10 Recent Posts
I tried running your simulation. I also obtain the

*** ERROR: file 'norm_end' expected to signal a correct SWAN calculation

message. The SWAN error file contains the message:

Terminating error: Allocation problem: array AC2 and return code is 41

Is this the same message you obtain? I believe error code refers to "Insufficient virtual memory", but I wouldn't expect this to be grid cell size dependent.

I notice that your "reducidas" grid only touches the "indefinidas" grid. To my knowledge, Delft3D-WAVE only supports nested grids, i.e. the boundary reducidas grid should be inside the indefinidas grid.

Success,

Bert
JT
Javier Tercero, modified 8 Years ago.

RE: Is there a minimum size of grid?

Padawan Posts: 26 Join Date: 10/8/12 Recent Posts
Thanks for your time!

Yes I got the same message.

I think you are wrong because if I use a smaller size I can run it... Maybe the problem is the virtual memory

Regards