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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

No Bed Level Update

Klaas Lenstra, modified 3 Years ago.

No Bed Level Update

Youngling Posts: 1 Join Date: 12/22/15 Recent Posts
Hello everyone,

I'm using Delft3D coupled to SWAN for my work as a PhD student. The area of interest is ebb-tidal deltas. In my latest run I've encountered a problem which I'm not able to resolve.

In this run, the system is forced with both tides (semidiurnal) and waves. The first 4 tidal cycles, no bed level changes are allowed: "MorStt = 2.8800000e+003 [min] Spin-up interval from TStart till start of morphological changes". However, the model computes no bed level changes after the Spin-up. When I remove the Spin-up, the model does work (however, the results are not quite as they should be, which shows that in this case, the Spin-up is essential). Any nonzero value for MorStt gives the same problem. The weird thing is that all files (except the .dep files) are exactly the same as my other runs, which do work. Has anyone encountered this problem before and does anyone know how to solve it?

Kind Regards,
Klaas Lenstra
Qinghua Ye, modified 3 Years ago.

RE: No Bed Level Update

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Klaas,

This is a bit weird, since this function people are using it everyday. It should not have any problem. Based on the information you provided, we cannot judge what the problem is. Can you offer more information?

Or it has been solved by yourself already?

Best Regards,