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



Message Boards

Dispersion array files (.dsp)

Javier F Bárcena, modified 6 Years ago.

Dispersion array files (.dsp)

Youngling Posts: 10 Join Date: 1/4/12 Recent Posts
Hi all,

I'm trying to build a .dsp file in order to generate variable dispersion coefficients in a curvilinear grid. I've alredy read the manuals and I've obtained de .asc file that you need to know the number of overridings and their names. Finally, you need to write the new dispersion value.

Regarding the .asc file, I would like to ask if anyone know what does it mean the column 6 and 7 lenghts? I'm a bit confussed about what distances are given in this two columns. Furthermore, is it possible to know to which cell corresponds any overriding in the .asc file?

Thanks in advance and regards,
Anonymous Anonymous, modified 6 Years ago.

RE: Dispersion array files (.dsp)

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Javier,

The length-from and length-to columns indicate the lengths between the from an to segment centers to their common exchange area. It is used to compute dispersion fluxes between those two segments.

Dispersion coefficients are defined on exchanges (i.e. the interface between two segments). The exchange numbers are as shown in the pointer file (the .asc file you mentioned). First line is first exchange, etc...

Hope this helps.
Javier F Bárcena, modified 6 Years ago.

RE: Dispersion array files (.dsp)

Youngling Posts: 10 Join Date: 1/4/12 Recent Posts
Hi Christophe,

It helps a lot... I am only ask to be sure about the distances. Now, I can build my own dispersion file with spatial variable dispersion.