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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.

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D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


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Trouble in modeling NO3 in a wastewater pond

FG
Fatemeh GholamiMahyari, modified 2 Years ago.

Trouble in modeling NO3 in a wastewater pond

Youngling Posts: 23 Join Date: 4/8/16 Recent Posts
Hi Everyone

Before telling my Problem I should thank WAQ group which has helped me a lot so far. I am working on modelling a wastewater stabilization pond. I have modeled the pond most of model results including DO, PO4 and biomass seem so good but NO3. Nitrate modeled are too high comparing to observed data. Actually algae in the pond increased NO3 instead of absorbing it. I changed many parameters related in absorbing NO3 by algae but any of them had not affect on NO3 modelling. I was wondering could somebody help me and give me some advice?

Regards,
Fatemeh
MJ
Michelle Jeuken, modified 2 Years ago.

RE: Trouble in modeling NO3 in a wastewater pond

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
Hi Fatemeh,

Your welcome! Have you looked into other limiting factors? When algae growth is limited by phosphorus or light, changing anything in the nitrogen doesn't affect the result.

Michelle
FG
Fatemeh GholamiMahyari, modified 2 Years ago.

RE: Trouble in modeling NO3 in a wastewater pond

Youngling Posts: 23 Join Date: 4/8/16 Recent Posts
Dear Michelle

Thanks for your quick respond. I changed many factors such as N/C in Algal stoichiometry section as well as mortality rate and fraction detritus. None of these changes helped me. I was gonna do some changes about a parameter (fam) which you mentioned in the D-Water_Quality_Processes_Technical_Reference_Manual, but I could not find it in the process parameter. If you help me to find out what is it, that may solve y problem. In D-Water_Quality_Processes_Technical_Reference_Manual there is a parameter f am in the page 89&90, which is defined as "fam fraction of ammonium in the consumed nitrogen nutrients". How can I change this parameter? If you have any suggestion please tell me. I would appreciate your help.

Thanks
Fateme
MJ
Michelle Jeuken, modified 2 Years ago.

RE: Trouble in modeling NO3 in a wastewater pond

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
Hi Fateme,

Both the BLOOM and DYNAMO algae models have a preference for NH4. The only will take NO3 when there is hardly any NH4 left.

For BLOOM algae, you might change ThrAlgNH4, for DYNAMO algae, it is possible rise NH4KRIT, to increase the preference for NO3. If you can't find them in the PLCT, you might also add them to the sub-file manually. Just copy an other parameter in the file, and change the name.

The fraction NH4 is then an output: FracUptNH4. When there is enough NH4, it will be 1.0.

greetings,
Michelle
FG
Fatemeh GholamiMahyari, modified 2 Years ago.

RE: Trouble in modeling NO3 in a wastewater pond

Youngling Posts: 23 Join Date: 4/8/16 Recent Posts
Thanks a lot dear Michelle

I will do as you tell me and tell you the result.

Regards,
Fateme
FG
Fatemeh GholamiMahyari, modified 2 Years ago.

RE: Trouble in modeling NO3 in a wastewater pond

Youngling Posts: 23 Join Date: 4/8/16 Recent Posts
Dear Michelle

Thanks a lot. I did as you tole me and my problem with NO3 has solved. I am so grateful to you and your group.

Regrds,
Fateme
MJ
Michelle Jeuken, modified 2 Years ago.

RE: Trouble in modeling NO3 in a wastewater pond

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
And thank you for letting us know!

Michelle