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

Grid orientation problem (D3D-FLOW)

Yahia Kala, modified 2 Years ago.

Grid orientation problem (D3D-FLOW)

Youngling Posts: 12 Join Date: 7/11/13 Recent Posts

Hi All, I have a grid that I have converted from a structured finite element model. The grid covers a river and a floodplain. The gridlines meander quite a bit but are pretty smooth but have some areas with bad orthogonality. The node numbering is proving to be quite problematic when I try to run the model.


I get the following error:


*** ERROR Grid orientation incorrect: Delft3D requires (M,N) to form a counter-clockwise coordinate system.


I noticed that this check was a recently added feature in this release notes page:


I can't really get around this issue by rotating the grid administration. My geometry and gridlines are such that the numbering can never be counter-clockwise in every part of the domain.


Why is this constraint in the model and what can I do about it?


Yahia Kala, modified 2 Years ago.

RE: Grid orientation problem (D3D-FLOW)

Youngling Posts: 12 Join Date: 7/11/13 Recent Posts

I solved my own issue: I simply reversed the row coordinate arrays I was using to generate the grid. Now the numbering is 'counter-clockwise', as in, when you move along increasing m-values, the n-values are increasing to the left.