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. 




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



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Delft3d WAVE grid cell centers vs corners

Hannah Snow, modified 3 Years ago.

Delft3d WAVE grid cell centers vs corners

Youngling Posts: 3 Join Date: 9/3/15 Recent Posts

I am hoping someone can clarify which variables in the WAVE module are calculated and exported at grid cell centers versus grid cell corners? I am processing my data in Matlab - when I read in the grid (using the 'wlgrid.m' function) the X and Y coordinates given correspond to grid cell corners. I think that the depth data in the .dep file also corresponds to grid cell corners (although there is an additional dummy row in both dimensions). Is the wave height, period, and other parameters also calculated and exported at the grid cell corners (I am using 'qpread.m' to read in the data to Matlab)? I thought that SWAN calculated wave parameters at the grid cell center (but I could be wrong).

When I use QUICKPLOT to view the data, it appears that the wave parameters are calculated at the corners. I just want to be clear on this because the manual indicates that some variables are not defined at the corners but I wasn't able to find which variables. There is more information in the FLOW manual on grid center vs corners for the FLOW parameters but I am running the WAVE module standalone.

Thank you for any help!