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. 
 

** PLEASE TAG YOUR POST! **

 

 

Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

Refine Grid locally for river discharge

LS
Lucas Storto, modified 2 Years ago.

Refine Grid locally for river discharge

Youngling Posts: 4 Join Date: 8/24/16 Recent Posts
Hello,

I'm currently trying to create a grid for the Rio de la Plata estuary using Delft3d's RGFGRID. The problem is there are several river discharges into the estuary (see image below) and I can't find a way to locally refine the grid made out of splines to take them into account.








What would be the best way to include those river discharges into the grid? I'll attach the landboundary and spline file below

Thank you for your time,
Lucas
DK
Dmitry Kushnir, modified 2 Years ago.

RE: Refine Grid locally for river discharge

Padawan Posts: 84 Join Date: 11/9/12 Recent Posts
Hi Lucas,

I think you should put your splines more closely together (see attachment). They're seem to be sparsely located.

Regards,

Dmitry
LS
Lucas Storto, modified 2 Years ago.

RE: Refine Grid locally for river discharge

Youngling Posts: 4 Join Date: 8/24/16 Recent Posts
Dmitry,

thanks for your answer! It was just what I was looking for.

Now, just out of curiosity, I was also trying to solve it using multiple grids attached by DD Boundaries (image below)
Is it also a valid way to build the grid? Or it will cause differences with the method you describe?
Thank you for your time



Regards, Lucas
DK
Dmitry Kushnir, modified 2 Years ago.

RE: Refine Grid locally for river discharge

Padawan Posts: 84 Join Date: 11/9/12 Recent Posts
Lucas,

It might be worth trying multiple DD-grids if you focus specifically on these areas and want a higher resolution there.
Be aware that this is more complicated technique compared to single domain simulation.
For instance, for every DD-grid a separate set of input files (.grd, .mdf etc.) have to be prepared, each domain is supposed to run in a separate thread on a multi-core PC (or cluster) and different files with simulation results will be generated for each domain. See appendix B.14 of FLOW user manual for more details.

Regards,

Dmitry