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

layer wise thin dam input

Binata Roy, modified 2 Years ago.

layer wise thin dam input

Youngling Posts: 4 Join Date: 11/6/16 Recent Posts
Dear Fellow Researchers,

I have developed a 3D model of Jamuna River of Bangladesh using 5 layers. Now I want to put a semi permeable bundal structure in my model using thin dam in upper 2 layers and keeping the lower layers free. But I am finding no such option in Delft3D. So my question is " is there any option of providing block in upper 2 layers and keeping the lower 3 layers free?" If you know please let me inform. I am badly in need of this technique.

Binata Roy
Lecturer, IWFM, BUET
Bilal Ahmed, modified 2 Years ago.

RE: layer wise thin dam input

Youngling Posts: 7 Join Date: 2/27/15 Recent Posts
Hi Roy

I am not quite sure, but I think it is only possible when you use this structure as a boundary condition. Then do following

  • Define boundary condition
  • For flow conditions set the following

    Type of open boundary (quantity) = Discharge per cell
    Forcing type = Time series
    Vertical profile for hydrodynamics = Per layer specified
  • Go to ' Edit Flow conditions' to open the window with title 'Boundaries: Flow Conditions'
  • Now You can define flow through each layer

So according to your case probably it would be like setting flow through layer 1 and 2 to zero and then define flow through rest of layers.

Hope it works.

Binata Roy, modified 2 Years ago.

RE: layer wise thin dam input

Youngling Posts: 4 Join Date: 11/6/16 Recent Posts
Dear Ahmed,

Thank you for your cooperation. But mine is a structure whose characteristics match with the thin dam feature of delft3D. Do you know whether this structure will resemble with the boundary coundition of flow?