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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

non-hydrostatic z-level and parallel

Markus Gross, modified 3 Years ago.

non-hydrostatic z-level and parallel

Youngling Posts: 7 Join Date: 12/10/11 Recent Posts

I am setting up a non-hydrostatic z-level model. It is running fine in serial, but needs 180days to run for three days emoticon

Therefore I would obviously like to run in parallel, but whilst it runs there is a clear sign of CPU boundaries imprinting and, depending on the revision number setting Nharea may or may not work. In the latest revisions I found it does not, because it compares the limits to the local grid numbering, not the global one. For rev. 6680 it "works" but I have not looked at the result yet, I guess it is not right (hence the change in the later revisions).

Therefore my question: It seems that it is ongoing work to get the z-level (non-hydro) to work in parallel, correct? If yes, is there any estimate when that should be working? I.e. is it a priority for deltares or not? If yes I would obviously not "waste" my time tying to get it to work, just to find that a month later you have done it properly. If not then I may be tempted to see what I can do.

Many thanks!
Best wishes,
Adri Mourits, modified 3 Years ago.

RE: non-hydrostatic z-level and parallel (Answer)

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Markus,

Parallellization of the non-hydrostatic z-level model is currently not having a high priority. You are free to have a go at it. Please let me know if you want a branch in subversion or if you have questions.