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

Domain Decomposition with Spherical Coordinates

Katrin Mar, modified 7 Years ago.

Domain Decomposition with Spherical Coordinates

Youngling Posts: 4 Join Date: 5/14/13 Recent Posts
Hello everyone,

for my MSc thesis I am working with Delft3D-Flow. When running the model using domain decomposition and a spherical coordinate system, I got a warning that this combination has not been tested yet.
Does anybody know the current situation on this or have experience with it? Is it a big risk to use domain decomposition with spherical coordinates?
I would appreciate your help!

Jack Shipton, modified 7 Years ago.

RE: Domain Decomposition with Spherical Coordinates (Answer)


I have a model that I use regularly, for which I have a Spherical and a Cartesian version.

This model has DD boundaries. I have no issues with running the spherical version, and the results between versions are virtually identical.

Any differences are well beyond the magnitudes that I am interests in resolving (i.e. below cm scale). I would be interested to hear of any other experiences on this issue.

For Cartesian grid models, a Latitude value is input by the user (under ‘Domain’ in the Flow GUI). Since I originally converted my model from Spherical to Cartesian coordinates, I used the latitude found at the entre of my domain. I attribute any differences between the two versions down to approximations from this value.

Kind Regards,

Katrin Mar, modified 7 Years ago.

RE: Domain Decomposition with Spherical Coordinates

Youngling Posts: 4 Join Date: 5/14/13 Recent Posts
Dear Jack,

Thank you very much for letting me know your experience of succesfully using dd with spherical coordinates.
I would still be interested in other people's experiences but will probably just give it a go!

Kind regards,