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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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Sub groups
D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


Message Boards

Settling of algae on the sediment

SZ
Stephanie Zeunert, modified 6 Years ago.

Settling of algae on the sediment

Youngling Posts: 14 Join Date: 6/2/14 Recent Posts
Hi everyone,

At the moment I’m trying to figure out how to include the settling of algae on the sediment and the subsequent conversion into DetC/N/PS1. For the modelling of the sediment I’m using the S1/2 approach. Algae are modelled with DYNAMO. According to the WAQ User Manual for DYNAMO algae biomass only settles in DetC/N/PS1 (Chapter 4.3). I’d like to use the processes SED_GRE and SEDN_ALG, but unfortunately I can’t find the second process in the PLCT. Maybe I’m missing something or I’m not using the newest version of the PLCT (my version is 5.04). I would really appreciate it, if you had some advice for me.

Thanks
Stephanie
AA
Anonymous Anonymous, modified 6 Years ago.

RE: Settling of algae on the sediment

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Stephanie,

I'm guessing you're looking for SedN_Alg because of this bit of text from the Technical Reference Manual:

Process SEDPHDYN delivers the settling rate of total algae biomass (C). The settling rates of the nutrients in algae biomass (C,N,P,Si) for DYNAMO are calculated by process SEDN_ALG, that uses input parameters for the stochiometric ratios.

Congratulations, you found an error in the manual. SEDN_ALG does no longer exists and has been merged with SEDPHDYN, which now takes care of translating sedimenting algae biomass (sum of Diats and Greens) to DetxS1 (x = C, N, P and Si) fluxes, based on stochiometric ratios.

Hope this helps.
SZ
Stephanie Zeunert, modified 6 Years ago.

RE: Settling of algae on the sediment

Youngling Posts: 14 Join Date: 6/2/14 Recent Posts
Hi Christophe,

Thank you for your answer. Unfortunately I can't find this process in the PLCT either.
For which substances is it implemented?

Regards
Stephanie
AA
Anonymous Anonymous, modified 6 Years ago.

RE: Settling of algae on the sediment (Answer)

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Dear Stephanie,

Process SedPhDyn was indeed not visible in the PLCT. This has been fixed in revision 4812.
You can activate the process when modelling substances like DetNS1, DetPS1, etc... (from group organic matter).

I have attached the corresponding library. If you are using a recent revision, copying this library to your installation folder should be enough. If not, you'll have to update your whole installation.
SZ
Stephanie Zeunert, modified 6 Years ago.

RE: Settling of algae on the sediment

Youngling Posts: 14 Join Date: 6/2/14 Recent Posts
Hi Christophe,

It's working now. Many thanks for your help!

Stephanie