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

Delft-WAQ General Suspended Sediment Model

Li Haijun, modified 6 Years ago.

Delft-WAQ General Suspended Sediment Model

Hi everyone,

I included the "Sediment" process in the Delft-Flow to simulate the concentration of suspended sediment named "Sediment Mud" and it worked well. I could see the spatial distribution of the sediment concentration with QUICKPLOT.

The manual says that "the General Suspended Sediment Model" in the Delft-WAQ could simulate the suspended sediment too. However, when I used the susbstance file "sed_1fraction_04.sub" in the Delft-WAQ model to do the same simulation in order to see the result of comcentration of sediment,the concentration of IM1 was very different with the Sediment Mud in the results of Delft-Flow!!

I am not so familiar with the WAQ module. Does "IM1" represent the suspended sediment in the Delft-WAQ just as "Sediment Mud" in the Delft-Flow? And how can I adjust the parameters to get the right result of IM1 in the WAQ just as Sediment Mud in the Flow?


Li Haijun
Qinghua Ye, modified 6 Years ago.

RE: Delft-WAQ General Suspended Sediment Model (Answer)

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Li Haijun,

Even though both WAQ and FLOW solve the transport equation, these 2 solvers are different, and they are for different purposes. WAQ didn't have consider bed level change, and flow didn't consider much in the bed layers by default. It is hard to give out the same answer if you didn't set up both models very carefully.

Is this the answer of your question?

Li Haijun, modified 5 Years ago.

RE: Delft-WAQ General Suspended Sediment Model


Thank you for your reply.
I do not know the WAQ model well so far. I will use FLOW more to simulate the sediment transportation.

Li Haijun