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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Depth averaged morphodynamic modelling with suspended sediment transport

Pedro Barrera, modified 2 Years ago.

Depth averaged morphodynamic modelling with suspended sediment transport

Youngling Posts: 1 Join Date: 12/15/14 Recent Posts

Dear D3D Community,

I am trying to set up a 2D model to reproduce the siltatiion of a dam reservoir in Ecuador. There are basically 2 sediment fractions which are of importance, sand and clay. For the clay fraction, I followed the cohesive sediment modelling approach described in the manual. Test runs considering only this fraction have given reasonable bed level profiles along the reservoir. The problem arises when I try to run similar tests considering only the sand fraction in depth-averaged mode. Using the Van Rijn sediment transport formulae for non-cohesive sediment, the sediment concentration imposed at the inflow boundary does not spread over time along the domain even if the settling velocity is set to a really small value (<0.0001 m/s). I tried running the same set-up in 3D with 6 layers and the results change dramatically. In the 3D case, the sediment concentration spreads along the domain in a similar fashion as for the cohesive fraction tests. So, is it possible to run 2D simulaitons of non-cohesive sediment  considering a sediment input at the inflow boundaries or is this feature exclusive of 3D set-up models, and if so, could you please provide some guidelines or references to implement the depth averaged model?

 

Kind regards,

 

Pedro

U
Yego Mo, modified 6 Months ago.

RE: Depth averaged morphodynamic modelling with suspended sediment transpor

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