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

Domain Decomposition

PS
Phil Shepperd, modified 4 Years ago.

Domain Decomposition

Padawan Posts: 33 Join Date: 5/31/11 Recent Posts
Hi all. I'm having a problem with a 4 grid DD model, in that when I make a tiny change to the inner grid - e.g. adding a thin dam - the changes in velocities through all grids (except the outer one) are far larger than can be attributed to the change. The changes are seemingly starting at the grid interfaces, so I wonder whether it is to do with the way bathymetry has been defined. Values at common points are the same. From the Quickin manual: "Furthermore, for the re ned model, it is proposed that the depth values in the intermediate points are determined by linear interpolation." To do this manually in Quickin would take a very long time. Does it offer another way? Is there another possible explanation for what I'm seeing? Thank you
JL
João Lencart e Silva, modified 3 Years ago.

RE: Domain Decomposition

Padawan Posts: 70 Join Date: 3/30/11 Recent Posts
Hi Phil,

A late response to this...

Have you tried using the matlab tools to interpolate between the common grid points in the interface?
Alternatively you can use the openearth tools to load your dep file into python and use numpy for the interpolation:

https://svn.oss.deltares.nl/repos/openearthtools/trunk/python/OpenEarthTools/openearthtools/io/delft3d/

Hope it helps,

João.