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

RE: Optimal wind drag coefficient

Michael Ulmgren, modified 1 Month ago.

Optimal wind drag coefficient

Youngling Posts: 6 Join Date: 1/19/17 Recent Posts
Hello! In the Delft3D-FLOW Manual on page 66 there are default values for coefficients A through C depending on the wind speed. I'm wondering if there are any useful publications where these wind drag coefficients have been calibrated for high-wind conditions? How were the default values calibrated? I'm modeling wave growth in an estuary and my design wind speed is about 19 m/s.
Julius Schlumberger, modified 1 Month ago.

RE: Optimal wind drag coefficient

Youngling Posts: 1 Join Date: 12/20/20 Recent Posts
Hey Michael, I am also looking for such publications as I have to justify the values used in a calibration of a storm surge event with wind speeds up to 28 m/s. Haven't found any yet. But will share it here, if I find anything interesting. Best, Julius