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



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Wrong results obtained using SWAN when taking diffraction into account

Peng Dai, modified 1 Year ago.

Wrong results obtained using SWAN when taking diffraction into account

Padawan Posts: 59 Join Date: 8/2/12 Recent Posts

Dear all:

I came to  an obviously wrong results when simulating waves using SWAN. It's a course domain and fine domain coupled simulation. When I uncheck the diffraction effect, everything seems all right (pls see the figure 1&2 attached). However when the diffraction is taken into account, the result for the fine domain is zero wave height(pls see the attached figure 4), no waves, which is not reasonable. Please note that the results for the course domain is OK (pls see the attched figure 3).


Can you kindly give me some advice? These figures are numbered in a sequential manner. The log file is also attached. let me know if you would like more information about.