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. 
 

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Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

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Wind velocity in Wave model

Mladen Radovanovic, modified 8 Years ago.

Wind velocity in Wave model

Youngling Posts: 10 Join Date: 6/10/12 Recent Posts
Hi all,

Since the wind velocity influence on SWAN output values is quite significant (of course, waves are wind generated), is there any paper which consider this item more in detail?

In the SWAN manual and relevant books there is only note that wind velocity at 10m elevation should be used but there is a big difference between, for example 60s averaging wind and 1hr averaging wind speed. Consequently, the output is very different. (in my model it is Hs=7.5m against Hs=3.5m, respectively)

Furthermore, in a case of uniform wind (over computational grid) which wind speed should be used? It is difficult to imagine that wind blows with its full speed all over the area of , let say 5x5 km. Therefore, some decreasing in wind speed should be adopted.

I am aware that used wind speed is related to the size of the computational grid, duration of the storm and many other factors but I need some references.

What is your experience? Does someone want to discuss on this subject?

Keep in mind that output is significantly different for wind speed of 15m/s and 20 m/s.

Regards,

Mladen