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

Questions of model refinement and FLOW-WAVE coupling

You Yao, modified 5 Years ago.

Questions of model refinement and FLOW-WAVE coupling

Youngling Posts: 3 Join Date: 9/6/12 Recent Posts
I am new to delft-3D and I am starting a project that needs FLOW and WAVE coupling.
The DEM has 3 level of refinements (coarse, medium and fine). The finer grids are totally inside the coarser grids.
My questions are:

1. Should I use domain-decomposition or nesting to achieve the model refinement?

2. One wave model could only couple one FLOW model. I heard domain-decomposition could not be used for WAVE. Then if I choose domain-decomposition for FLOW, should I build several corresponding WAVE models as well? If I use nesting, the grid for WAVE should be the same as FLOW or not?

3. How about the DEM inconsistency between each level of refinement?
Chloe Sarah Morris, modified 1 Year ago.

RE: Questions of model refinement and FLOW-WAVE coupling

Youngling Posts: 5 Join Date: 1/15/19 Recent Posts

Hi You Yao,


Did you receive a reply, or find the answers to your questions. I'm looking for similar answers!

I want to have a coarse and fine grid of my study area, but am unsure whether the FLOW or WAVE model should have coarse-fine nesting and if wave, whether the finest resolution needs to be the same as the FLOW.