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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Flow model error when include sediment

YS
Yuwana Sriraharjo, modified 2 Years ago.

Flow model error when include sediment

Youngling Posts: 2 Join Date: 7/29/16 Recent Posts
I have problem every time I run sedimentation in flow and wave model,

My research is to identify sedimentation and erosion in coastal area. Before I add sedimentation in my flow and wave model,and everything goes well.
After I add sediment and morphology area it always exited abnormally because water level change too high > 25.00 m

Here the note that I got from diagnosis file.
"ERROR Water level change too high > 25.00 m (per 0.5 DT) after 343 timesteps"...

Boundary that I used in flow model is water level and rieman with harmonic component.

Can anybody help me for this problem?
Alejandro Paladio, modified 2 Years ago.

RE: Flow model error when include sediment

Youngling Posts: 9 Join Date: 11/14/12 Recent Posts
Hey Yuwana Sriraharjo,

If the problem is only when you run the MOR-module of delft3D, you can try with:
SgrThr = 99.0
In the "Additional parameters" in the FLOW-Module.

There are some other options you can check:
For example, the Courant number, to see if the selected time step is the good one (in QUICKIN), or you need to make your time step smaller.
If that is correct, you can change in the "Physical parameters" tab, and then "Roughness", I use Manning around 0.02~0.04... or you can make it bigger... with that, the velocity will go down.

If you want, you can upload your model, I can help you,

Greetings from Mexico!