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

Difference between WAVE and FLOW results

JG
João Gil, modified 7 Years ago.

Difference between WAVE and FLOW results

Padawan Posts: 29 Join Date: 10/24/12 Recent Posts
Hello,

I'm currently running a coupled simulation between FLOW and WAVE modules in order to compare the obtained results with experimental data from Large-Scale Sediment Transport Facility (LSTF).
However, if the extracted data from FLOW (trim-flow file) and WAVE (wavm-wave file) is plotted in the same graph, there can be seen a little disagreement between both results (see attachment). The attached image shows the significant wave height along a cross-shore section of the domain. Is this normal? What am I missing?

Kind regards,
João Gil
JH
Jeff Hansen, modified 7 Years ago.

RE: Difference between WAVE and FLOW results

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

If you have wave height as output in the trim file I assume you are using the roller model. If this is the case the roller model uses a different wave dissipation formulation (Roelvink, 1993) from SWAN (Battjes & Janssen, 1978). I suspect this could explain the difference along with possible differences in Gamma between SWAN and the roller model, assuming everything else is the same between the flow and wave models (e.g. grids).

hope this helps,
jeff
JG
João Gil, modified 7 Years ago.

RE: Difference between WAVE and FLOW results

Padawan Posts: 29 Join Date: 10/24/12 Recent Posts
Jeff,

Indeed I'm using the roller model, and I've thought about that aswell. My WAVE grid is larger than the FLOW grid, however both of them overlap.

Thanks for your reply,
João Gil