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

add com file contents to trim file?

JH
Jeff Hansen, modified 8 Years ago.

add com file contents to trim file?

Padawan Posts: 29 Join Date: 7/12/11 Recent Posts
Hi,

I was wondering if anyone is aware of a way to save the contents of the com file to the trim file (or at least add a time dimension to the com file instead of over-writing each time). I am particularly interested in the wave parameters from SWAN that are interpolated onto the flow grid (wave direction, frequency, etc). I can obviously get this information from the wave-map file but would prefer to see exactly what the flow model is actually using. A particular example, with the roller model turned on I would like to know what wave direction and frequency the flow model is using to calculate the dissipation and ultimately the radiation stress gradients. I have a particular case in which along a section of the shoreline the alongshore components of the radiation stress gradients in the flow model are in the opposite direction than they should be based on the wave directions in the wave map file. I would like to know why this is happening.

Plus, it would be nice not to have the re-interpolate the output from the wave domains onto the flow domains in post-processing since this has already been done once.

Thanks

Jeff
Renan Ribeiro, modified 8 Years ago.

RE: add com file contents to trim file?

Padawan Posts: 55 Join Date: 3/23/11 Recent Posts
Hi Jeff,


Did you try to check the box "Output for FLOW grid" in Output parameters tab at Delft-WAVE GUI?
I think this is what you're looking for.

Regards,
Renan
Bert Jagers, modified 8 Years ago.

RE: add com file contents to trim file?

Jedi Knight Posts: 201 Join Date: 12/22/10 Recent Posts
Hi Jeff,

There is no option to copy com-file data to the map-file, but the optional keyword

AppendCOM

in the [Output] block of the .mdw file lets you determine whether upon writing to communication file(s) Delft3D-WAVE overwrites the previous data (false) or append to the data
series (true) (default: false). Setting it to true may give what you're looking for.

Success,

Bert
JH
Jeff Hansen, modified 8 Years ago.

RE: add com file contents to trim file?

Padawan Posts: 29 Join Date: 7/12/11 Recent Posts
Bert,

This is exactly what I was looking for. Thank you very much.


Renan,

Checking the box "Output for FLOW grid" tells the model to write the COM file but every time SWAN runs the past COM file is overwritten by default, so you only have the most recent information. The keyword Bert suggested adds a time dimension to the COM file and appends the info from each SWAN run instead of overwriting it.

Regards,

Jeff