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

CONSBL: grazing fluxes are recorded all NaN

João Lencart e Silva, modified 7 Years ago.

CONSBL: grazing fluxes are recorded all NaN

Padawan Posts: 71 Join Date: 3/30/11 Recent Posts
Hi all,

Still trying to make some sense of CONSBL...
I now have a calculated zoo concentration that makes some impact in my model. I still have to calibrate input concentrations and grazing rates. For that I need to see what are the grazing fluxes.
I've tried to look into dGrzAlgX, dGrzDetX and I even added dGrzGreen to my inp file (which is listed but not available in the GUIs).
All of that comes out with NaN in both my his and map files. This is strange since my Greens and DetX are all impacted by adding the zoo...

How can I access the calculated fluxes?

I'm running with ZfrDetBot = 0 and ZUnitSW = 0.


Thanks in advance,

Jan van Beek, modified 7 Years ago.

RE: CONSBL: grazing fluxes are recorded all NaN (Answer)

Hi João,

The fluxes (dGrxAlgx, etc) are not available in the normal output but they are availeble in the balance output. Too see individual fluxes you need to set the option BALANCES-SOBEK-STYLE
together with BAL_NOLUMPPROCESSES, see the documentation for more on the balance output options.

All of the fluxes will be integrated for the monitoring points and areas. A timesries with the monitoring timestep will be written to the *-bal.his file. An integrated mass balance over the complete monitoring interval will be written to the *-bal.prn file.