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

RE: Substances files

Ana Mend, modified 5 Years ago.

Substances files

Youngling Posts: 5 Join Date: 3/19/13 Recent Posts
I'm trying to model an effluent from a submarine outfall.
I have data of 'suspended solids', BOD5, COD, Ntotal, Ptotal and E.coli.

I would like to model in my domain 'dissolved oxygen', 'eutrophication', 'E.coli' but also to test which primary producers (algae, etc) can suffer with the effluent.

I have some doubts, maybe you can help me. Should I:
1. use ECO in the PLCT and add 'eutrophication' together with some available substances?

2. merge oxy_general_03.sub, coli_03.sub and sed_1fraction.sub?

3. how can I model Ntotal and Ptotal ? Ntotal already includes NH4, NO3 and in Delwaq they appear in separate...

Thank you in advance

Michel Jeuken, modified 5 Years ago.

RE: Substances files

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
Unfortunately there is no process to automatically separate N total into NH4 and NO3 because there is no general rule what the ratio is between the two. And N total not only comprises of NO3 and NH4, but also Organic N and algae N as well. So I’m afraid you have to make assumptions yourself about the composition of N total (and P Total) for initial conditions.

However, if you include enough relevant processes to the case you are looking at, and you run the model for a longer period, you might find out how relevant the initial conditions really are by changing them. Also the end result could give you a better idea about better initial conditions. You could use the file to use the end result as the initial conditions for another run for example. I hope this helps you a bit.