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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longshore current

AB
Agnese Baldoni, modified 1 Month ago.

longshore current

Youngling Posts: 1 Join Date: 3/24/20 Recent Posts
Dear all, we are modelling a coastal region. Our domain has three open boundaries (see attached figure 'current NW-SE') with:
- an astronomic water level condition at the offshore boundary;
- two Neumann conditions at the cross-shore boundaries.
We want to add a longshore current representing the Western Adriatic Current. We tried to impose a current time series on the NW cross-shore boundary and leave Neumann on the SE cross-shore boundary. The current varied from 0.3 m/s at the offshore node to 0.01 m/s at the shoreline node. The current propagated well inside the domain and stabilized after around 18 hours (see attached figure 'current NW-SE') . When we tried to switch the direction of the current, imposing the same current time series (with negative sign) on the SE cross-shore boundary and leaving Neumann on the NW cross-shore boundary, the current did not propagate (see figure 'current SE-NW' . 
Which could be the cause of this error? Any suggestion to solve our problem?
We also attached the grid and bathymetry files.  Thanks in advance.