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



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Sediment Transport Differences

Alfonso M JR, modified 5 Years ago.

Sediment Transport Differences

Youngling Posts: 8 Join Date: 1/22/14 Recent Posts
Hello everyone,

I’m using Delft3D-FLOW to compute a mass balance of a only sediment fraction (named mud20, cohesive sediment) in a lagoon connected to the Ocean through several tidal inlets. In order to quantify the sediment mass that exits the domain, I defined cross-sections over the open boundaries of the model.

I plotted the results obtained for one of the cross sections and I’m not able to understand the differences between the different outputs obtained (SEE ATTACHED FIGURE). In the attached figure is shown (1) the cumulative total transport of mud20, (2) the cumulative advective transport of mud20, (3) the cumulative dispersive transport of mud20, and (4) the sum of cumulative advective and dispersive transport of mud20. The cumulative total transport was multiplied by the mud20 density to have kilograms of mud20.

I wonder if someone knows the difference between Cumulative Total Transport (black line) and Cumulative Advective+Dispersive Transport (red line), since I supposed the must be the same quantity.

Thank you very much in advance!

alfonso m