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

about wave modelling

JC
Jun Cheng, modified 7 Years ago.

about wave modelling

Youngling Posts: 16 Join Date: 7/20/13 Recent Posts
Dear Deltares,

When I compare the distribution of significant wave height computed from wave-tide coupling model and wave-alone model, (the wave model from the same data set, and the coupled tide model share the same grid and depth file with tide model). I found that the wave height from the coupling(more than 1 m) is way higher than that from the wave-alone model (about 0.2-0.3 m). Given that the wave at the boundary is only about 0.3m, and the influence of tide on wave height shouldn't be that significant, so it is more likely that the wave-current coupling model have something wrong. Can someone suggest some hints that might cause the error please ?
Thanks so much!
Jun
Qinghua Ye, modified 7 Years ago.

RE: about wave modelling (Answer)

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Dear Cheng Jun,

Very interesting question. I can imagine that if the wave alone model has the same setting with the wave and flow online coupled model, the model results will be different, because these two are different models with differernt processes.

It might be too soon to say it is wrong. Need more close look.

Regards,

Qinghua
JC
Jun Cheng, modified 7 Years ago.

RE: about wave modelling

Youngling Posts: 16 Join Date: 7/20/13 Recent Posts
Thanks Dr. Ye, I will look into it closely.
Jun
Renan Ribeiro, modified 7 Years ago.

RE: about wave modelling

Padawan Posts: 55 Join Date: 3/23/11 Recent Posts
Dear Jun Cheng,

Probably there are something wrong.
Are you using winds at both simulations? Does this difference occurs all over the domain?

Regards
Renan
JC
Jun Cheng, modified 7 Years ago.

RE: about wave modelling

Youngling Posts: 16 Join Date: 7/20/13 Recent Posts
Dear Renan,

I didn't consider the wind for both model, and this difference happen all over the computing domain.
Thanks
Jun