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intro story DELWAQ


DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.




Sub groups
D-Flow Flexible Mesh

Cohesive sediments & muddy systems


Message Boards

Flow model error when include sediment

Yuwana Sriraharjo, modified 3 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!