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


Stavros Fostiropoulos, modified 5 Years ago.


Youngling Posts: 3 Join Date: 4/29/14 Recent Posts
Hi all,

I am new user of Delft3d flow and i use it in order to simulate salinity in an estuary. For the moment i run tests in a channel with two open boundaries (sea,river) and five vertical layers. First problem that i face is that during the flood the flow transports all the salt close to the river boundary and then i have a very abrupt gradient of salinity due to the fact that in the transport conditions i have set zero salinity for the river boundary so the system adjusts to the boundary condition. The other way round happens during ebb. Specifically, in a domain of 200km with dx=1000m it comes that the along x salinity gradient occurs for the flood period at first 10 km away from the river boundary. The second problem is that when i add discharge in the model, there is no salinity difference in the verical axis. The salinity profile remains perfectly uniform. Do you think that this is reasonable due to my settings? It would be nice if you had anything to suggest.Thank you very much!