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 in coupling Flow/Wave with Delwaq

AA
Amelia Araujo, modified 3 Years ago.

Problems in coupling Flow/Wave with Delwaq

Youngling Posts: 13 Join Date: 7/7/15 Recent Posts
Hi,

I have been able to couple Flow with Delwaq using the previously generated communication file, which use to have many time steps (according to the defined storage intervals in the .mdf file).
Now I need my hydrodynamic results to include also the waves, so I have run both Flow and Wave modules using online coupling. The problem is that, although I have defined several storage intervals, the generated communication file has 1 time step only (during the simulation the results are overwritten so when it finishes I have the results for the last time step only). Because the communication file has only 1 time step, I am not able to do the coupling with Delwaq, as start and stop times are equal, with a zero time step.

How can I do the coupling with Delwaq when adding waves to the hydrodynamics?

Thanks for your help.

Regards,

Amelia
AA
Amelia Araujo, modified 3 Years ago.

RE: Problems in coupling Flow/Wave with Delwaq

Youngling Posts: 13 Join Date: 7/7/15 Recent Posts
Hi,
I have just found an answer in the forum saying that the FLOW output files and .hyd file can be used directly in WAQ. So I presume that in my .scn file setup I just have to select the .hyd file (which is generated at the beginning of FLOW run) and I will be using all the hydrodynamics information, including the waves.

From my understanding, when NOT using waves in FLOW we can either couple the com-file after the FLOW simulation has ended or use the FLOW output files and .hyd file directly in WAQ. Are these two procedures exactly equivalent regarding the WAQ results?

Many thanks,

Amelia
MJ
Michel Jeuken, modified 3 Years ago.

RE: Problems in coupling Flow/Wave with Delwaq (Answer)

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
You are almost completely correct.

The only difference is that the old route where you convert from a com-*.dat file using 'coupling', by default the coupling program makes sure that the minimum volume is 1.0. With the direct writing of the files for WAQ, there is no minimum.