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

Courant Number

Kira Winter, modified 3 Years ago.

Courant Number

Youngling Posts: 9 Join Date: 8/26/16 Recent Posts
I have a question about the Courant Number. Why do you say in the Forum that a maximal Courant Number of 11 is prescribed? When I start a simulation, there comes a warning everytime the Courant Number is bigger than 1. I read in several papers that a courant number of maximum 1 is recommended. So I don't understand why you are talking about 11?

Thanks in advance.
Phil Shepperd, modified 3 Years ago.

RE: Courant Number

Padawan Posts: 33 Join Date: 5/31/11 Recent Posts
Hi. It's because the FLOW numerical scheme is implicit, rather than explicit, so the Courant No. can exceed 1. There is a discussion on this in the FLOW manual I think. :-)