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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

Where can I find source code for reference concentration?

Gabriel Lim, modified 6 Days ago.

Where can I find source code for reference concentration?

Padawan Posts: 32 Join Date: 5/5/18 Recent Posts

I am trying to implement my own reference concentration (Ca) formula into the Delft3D suite. I want to change ONLY the default Ca formula, and keep the rest of the equations (e.g. that compute transport rates, bedload, etc.). I was told that there are two ways to do this:

1) Replace the Ca formula in the source code with my own,
2) Write my Ca formula into a .dll file (user-defined transport formula, Appendix B.9.4) and copy and paste the rest of the equations from the default formulae into this .dll file.

However, I am having some trouble locating the default reference concentration formula used by the Delft3D-FLOW module when computing for non-cohesive sediments. Does anyone know where I can locate this formula in the source code? I have found the default equations of van Rijn (1993) in tram1.f90 (utils_gpl->morphology->morphology_kernel->source files), but there seems to be no reference concentration formula there, suggesting that it is computed elsewhere and called in. Any help would be much appreciated! Thanks,