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. 




Sub groups
D-Flow Flexible Mesh
Cohesive sediments & muddy systems




Fully coupled flow+wave model with nesting?

arun svv, modified 8 Days ago.

Fully coupled flow+wave model with nesting?

Youngling Posts: 6 Join Date: 4/22/15 Recent Posts

Hi All,

I have a query on coupled flow+wave model. From the flow and wave manuals and from the delft dashboard tutorial, I'm clear that we can perform coupled modelling of flow and wave modelling. In my case, I've configured a coarser domain (overall) with tidal boundaries (astronomic) at all the three boundaries for flow model (one is the land part) and WW3 output data for the wave model. The online coupling has been used. Model is successfully running without any problem.

However, I have another smaller domain (with high-resolution grid) within the overall model domain. I want to perform the same "coupled flow+wave" in the smaller domain also. The smaller domain has an orientation of 45 degrees.

Wave manual says for wave modelling nesting can be used. Whereas, the flow model environment doesn't have that option. Instead, we should either use "Domain decomposition" - for parallel running or Nesting (in offline mode), where I need to run the overall model first and extract the "bct file" to give as the boundary condition for the smaller domain.

I'm interested to use the coupled model in overall as well as fine resolution model domains. Is there any way to do that?

Presently, I've configured the overall model (flow+wave) with wave nesting option. So, I'm able to get the water levels and depth-averaged tidal currents for the coarser domain and waves for both coarser and finer domain.

Now I can extract the overall model boundary conditions and give as inputs to the flow model only. But I don't know how to extract waves from an overall domain as the boundary condition for the smaller domain.


Can someone help me in solving it?


best regards