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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symmtery in hydrodynamic input data and asymmetry in morphology output

HM
Hanieh Mohamadi Moghadam, modified 28 Days ago.

symmtery in hydrodynamic input data and asymmetry in morphology output

Youngling Posts: 4 Join Date: 8/20/17 Recent Posts

Dear delft3d experts,

I'm using Delft3D 4.01.00 for a while and I keep having this issue with the outputs.

I set up a simple hydro+morph+wave model. The hydro and wave domain are the same size (a rectangle: 500mx300m) with 100 grid cells in x direction and 60 grid cells in y direction. I made linear bathymetry with the slope of 10 degree. The lateral boundaries are Neumann and the offshore boundary is Water Level and no boundary condition is defined for the the land boundary. There is constant wave coming from the offshore (north). Every input in this model has symmetry on the east and west side but in the outputs (cumulative erosion/deposition, depth-averaged velocity,...) there is unexpected longshore current and sedimentation and asymmetry. 

I thought this might be the boundary condition effect so I doubled the size of the wave domain (made the wave domain wider). Unfortunately the issue still exists.

Attached please find the run files.

 

I really appreciate if you help me with it.

Thank you,

Hanieh

morphology delft3d wave asymmetry