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

Z-layer+Morphology and Nesting

Marina Amadori, modified 3 Years ago.

Z-layer+Morphology and Nesting

Youngling Posts: 1 Join Date: 9/17/15 Recent Posts
Hello everybody,

I would like to use the morphology module in combination with the Z-layer model on a large stratified lake both to evaulate the changes in the shores morphology and keep the fixed layer discretization.
When I try to do this I get an error message from the GUI (version 4.01.00) saying that "adding sediment consituents will reset the layer model to sigma layer", but if I manually change the mdf I am able to run the simulation. Then my questions are:

1. Is there a kind of mismatching between what the GUI allows me to do and the version of delft3d-flow? If yes, has the MOR+Zmodel combination been fully tested?

2. As I am interested only on the effetcs of sediment transport in a small portion of the lake, can I simulate two nested domains in such a combination? Is there anything I must take into account in using the nesting toolbox, given that I have troubles with the GUI?

Thank you,
Qinghua Ye, modified 3 Years ago.

RE: Z-layer+Morphology and Nesting

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Marina,

Morphology using z-layer model is still a beta function, which means it is not fully test. Thus you are right, not all the functions can be specified through GUI. You are most encouraged to edit the text-based mdf file.

For the 2nd question, you can use the nesting or domain decomposition. But keep in mind that you can only use the same layer type for overall model and the nested model. For nesting, you might have to very careful to choose the boundary conditions. GUI in this case, again, is just one of the option, and you are still encouraged to use mdf files.

Hope this is helpful,