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

bed elevation

FH
farshad heidarnezhad, modified 7 Days ago.

bed elevation

Youngling Posts: 3 Join Date: 5/20/18 Recent Posts
Hi everyone
I'm using delft3D for my thesis, lately I've had a problem about not knowing how to put the topographic elevation in the software. That's why it's reversed in the flow direction model. In my model, the direction of flow must be from the river to the lagoon, because the river elevation is higher than the lagoon elevation. However, I do not know how can I input the elevation of the river or lagoon in the software. I was wondering if anyone can explain a little bit about the setting of the software, especially about the entering inputs such as the elevation of lagoon and river.
The files are attached below.
Thank you for your help.
DK
Dmitry Kushnir, modified 8 Days ago.

RE: bed elevation

Padawan Posts: 94 Join Date: 11/9/12 Recent Posts
Hi farshad,At a first look the lagoon seems to be deeper than river. File river.bnd is missing though, so I cannot test your model.
Regards,Dmitry
FH
farshad heidarnezhad, modified 7 Days ago.

RE: bed elevation

Youngling Posts: 3 Join Date: 5/20/18 Recent Posts
Thank you Dmitry for your reply.
In reality, the flow direction is from river to lagoon based on the available data, because the bed level (the elevation from free surface) of river is higher than the bed level of the lagoon. However, in my model, this direction is from lagoon to river which is not correct.
The requested file is attached.
Thank you for your time.
Sincerely,
Farshad
DK
Dmitry Kushnir, modified 4 Days ago.

RE: bed elevation

Padawan Posts: 94 Join Date: 11/9/12 Recent Posts
Hi farshad,
You're using a total discharge upstream boundary condition at the river. This type of boundary depends on the grid orientation (cells' numbering). So, in your case, either use a negative discharge values in the *.bct-file or rotate the grid administration in the RGFGRID. I used the easiest way to obtain the realistic flow direction: changed the sign of the discharge data. Attached is the edited *.bct-file and a snapshot of the modelled river flow.
Regards,
Dmitry