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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Delft3D-FLOW validation

Bruna Ambrosio, modified 10 Months ago.

Delft3D-FLOW validation

Youngling Posts: 4 Join Date: 5/12/15 Recent Posts

Hi everyone.

I'm applying the Delft3D model to analyse morphodynamics processes at Fernando de Noronha Archipelago (Brazil). I've never used numerical models for oceanic islands before and I'm having problems with Deft3D-FLOW validation. The model domain includes a wide range of depths and a narrow, steep island shelf. I think these can be the complicating factors, increasing model instability. Actually, I've been testing a rectangular 2D grid with the island in the center (350 m resolution), using water level boundaries and only astronomic level and uniform wind as boundary conditions. I already tried to set a maximum depth to 1000 m after the bathymetry interpolation and smoothed the depths located after shelf, but even so the results do not change too much. I tested several combinations of coefficients (roughness, viscosity and wind drag), but I couldn't define one that works well for the velocity components.

Has anyone had problems applying Delft3D-FLOW for oceanic islands? Does anyone have any suggestions about the grid, bathymetry and boundary definitions? I really need help.

Thank you so much.