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

Water Level Change too high

NG
Niku Guinea, modified 4 Years ago.

Water Level Change too high

Youngling Posts: 2 Join Date: 6/27/16 Recent Posts
Hello, i am trying to model flow in a strait, therefore i made grid according to land boundary file and depth generated from delft dashboard. until this step, the modelling can be run just fine (although the water level is strangely very small, such as -3.03E-15 m.. the problem appears when i tried to add the open boundary which is water level astronomical with tidal constituent data also from delft dashboard. i suspect the error comes from the boundary that i make. can anybody help? i have attached all the files i used in this modelling.

Attachment : https://drive.google.com/open?id=0By31tkEPRVYEX3lOdjJlcXcwUkE
Many Thanks

Niku
Qinghua Ye, modified 4 Years ago.

RE: Water Level Change too high

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

Yes, it is related the boundary conditions you specified.

Coastal models are all about boundary conditions. The expertises are all related to this. For example, refer to http://oss.deltares.nl/web/delft3d/coast-/-estuary/-/message_boards/view_message/91262/maximized#_19_message_420704.

Maybe joining one of Deltares courses will help a bit as well. Refer to http://www.dsd-int.nl/2016/ or https://www.deltares.nl/en/academy/.

I hope this can be a little bit helpful.

Regards,

Qinghua
NG
Niku Guinea, modified 4 Years ago.

RE: Water Level Change too high (Answer)

Youngling Posts: 2 Join Date: 6/27/16 Recent Posts
Hi Qing Hua,

Thank you for your advice. actually i've solved the problem that is i use cartesian coordinates while i should use spherical coordinates for the grid. and it makes the grid has very low resolution and therefore make the courant number very high.

Regards,

Niku