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.




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D-Flow Flexible Mesh

Cohesive sediments & muddy systems


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Problems in coupling Flow/Wave with Delwaq

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I have been able to couple Flow with Delwaq using the previously generated communication file, which use to have many time steps (according to the defined storage intervals in the .mdf file).
Now I need my hydrodynamic results to include also the waves, so I have run both Flow and Wave modules using online coupling. The problem is that, although I have defined several storage intervals, the generated communication file has 1 time step only (during the simulation the results are overwritten so when it finishes I have the results for the last time step only). Because the communication file has only 1 time step, I am not able to do the coupling with Delwaq, as start and stop times are equal, with a zero time step.

How can I do the coupling with Delwaq when adding waves to the hydrodynamics?

Thanks for your help.


RE: Problems in coupling Flow/Wave with Delwaq
Answer (Unmark)
3/24/17 10:59 AMas a reply to Amelia Araujo.
I have just found an answer in the forum saying that the FLOW output files and .hyd file can be used directly in WAQ. So I presume that in my .scn file setup I just have to select the .hyd file (which is generated at the beginning of FLOW run) and I will be using all the hydrodynamics information, including the waves.

From my understanding, when NOT using waves in FLOW we can either couple the com-file after the FLOW simulation has ended or use the FLOW output files and .hyd file directly in WAQ. Are these two procedures exactly equivalent regarding the WAQ results?

Many thanks,

RE: Problems in coupling Flow/Wave with Delwaq
Answer (Unmark)
4/3/17 12:56 PMas a reply to Amelia Araujo.
You are almost completely correct.

The only difference is that the old route where you convert from a com-*.dat file using 'coupling', by default the coupling program makes sure that the minimum volume is 1.0. With the direct writing of the files for WAQ, there is no minimum.