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

Boundary Condition

KW
Kira Winter, modified 3 Years ago.

Boundary Condition

Youngling Posts: 9 Join Date: 8/26/16 Recent Posts
Hello Everyone,

I have a question about the boundary conditions. Is it possible to add two conditions to one boundary? For example water level and current. I wrote an ASCII file with the parameter, but when I import it in FLOW GUI it shows the same numbers of water level and current.

Thank you in advance.
Kira
Qinghua Ye, modified 3 Years ago.

RE: Boundary Condition

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

You cannot specify 2 types of boundary conditions at one point at one time. It is not sound numerically. But you can specify a relation of 2 types, for example, a discharge (U*A*water depth) or a Riemann invariant, etc.

Greetings,

Qinghua
KW
Kira Winter, modified 3 Years ago.

RE: Boundary Condition

Youngling Posts: 9 Join Date: 8/26/16 Recent Posts
Hello Qinghua,

thanks for your reply. The idea of connecting my water depth and current is a good idea.
I don't know how to calculate the surface of the grid cells (A). Assuming that my boundary goes along 10 grid cells with 1 m x 2 m x 3 m (m, n, water depth). How do I calculate this? By grid cell oder in total?

Thanks in advance.
Kira
Qinghua Ye, modified 3 Years ago.

RE: Boundary Condition

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

You can specify a total discharge for all the cells, or discharge for each cell. Those are all ok.

Greetings,

Qinghua