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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

 


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Modelling heat exchange of a stratified lake

MK
Marcin Kawka, modified 7 Years ago.

Modelling heat exchange of a stratified lake

Youngling Posts: 11 Join Date: 5/31/11 Recent Posts
Dear All,

I am trying to model an eutrophic and stratified small lake in Delwaq. Simulation period covers the whole summer so heating of top layers of water column (total depth 30meters) plays an important role. At the same time temperature limits the growth of algae and algal bloom creates turbidity in top layers which limits light extinction. I use Z-layers and hydrodynamic results from delft3D and wind-induced cooling (DelTRad) which affects the top layer.

As far as I understood the TEMPERATURE process description from Technical Reference Manual radiative heating is only possible "at dry flats" which is obviously not my case. So my question is: is it possible to include radiative heating of water not through the sediment? Or alternatively can at least I use modelled temperature from Delft3d in Delwaq? It's not perfect (no turbidity feedback) but it's closer to the reality. I attach plots of temperature for three different layers from both delwaq and delft3d for comparison.

Thank you in advance
Marcin Kawka
CT
Christophe Thiange, modified 7 Years ago.

RE: Modelling heat exchange of a stratified lake

Jedi Knight Posts: 125 Join Date: 11/15/12 Recent Posts
Dear Marcin,

It seems you just found a chapter in the DELWAQ Technical Reference Manual that needs some update.

To compute water temperature in DELWAQ you can activate the HeatBal process. HeatBal takes solar radiation as input a.o. and should meet your needs. As mentionned, HeatBal is not described yet in the Tech. Ref. but in the meantime you can have a look at the source code (file heatfl.f) or simply configure HeatBal through the PLCT GUI.

As for your second question, you can indeed use FLOW computed water temperatures. Among the DELWAQ input files produced by your z-layered FLOW model you should find a com-*.tem file. You can use this file as binary input to define a so-called segment function in DELWAQ (see section 7.3.4 of the DELWAQ input file description).

Hope this helps.
MK
Marcin Kawka, modified 7 Years ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 11 Join Date: 5/31/11 Recent Posts
To compute water temperature in DELWAQ you can activate the HeatBal process. HeatBal takes solar radiation as input a.o. and should meet your needs. As mentionned, HeatBal is not described yet in the Tech. Ref. but in the meantime you can have a look at the source code (file heatfl.f) or simply configure HeatBal through the PLCT GUI.


Thank you Christophe, this clarifies a bit.
So I opened PLCT editor to define HeatBal process for my simulation, I went through the general processes which might be associated with HeatBa (Temperature, Meteo, etc.)l, but I was unable to find HeatBal - is it hidden somwhere?

I tried to use PLCT in developer mode. When I try to add New Process for Water Temperature by entering Process ID: HeatBal I am able to add it (Program warns me that It will remain on the list only if influences ModTemp), and then when I try to save the GUI crashes.

I'm using Delft GUI 4.01.00.ohmw.rc07 and PCLT 5.04.01.29071 under windows, but I simulate under Linux with DELWAQ 5.01.01.2703M, my proc* files are:
1 995 820 Jul 15 17:18 proc_def.dat
42 652 Jul 15 17:18 proc_def.def
CT
Christophe Thiange, modified 6 Years ago.

RE: Modelling heat exchange of a stratified lake (Answer)

Jedi Knight Posts: 125 Join Date: 11/15/12 Recent Posts
Hello Marcin,

You don't need to open the PLCT in developper mode. HeatBal is an existing process. I wrongly guessed it would be a separate processes you could activate instead of the defautl one but it's actually the standard temperature module. So you simply need to select the substance "Water Temperature" and check the process "Temperature and heat exchange". One of the input items of this process is a switch that let's you choose to model absolute (0) or exces (1) temperature. The default is 1 so you need to make this parameter editable when editing the process in the PLCT and then change the value to 0 in de Delwaq GUI.

Regards,
Christophe
LA
lais amorim, modified 4 Years ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 3 Join Date: 5/11/16 Recent Posts
Hello,

I'm modeling the temperature stratification in a shalow lake, but the model didn't represeting the stratification. Can you have some ideias why? I already change the Wind drag Cof., the vertical vescosity and diffusivity, and a lot of other parameters.
MJ
mickey john, modified 1 Month ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 3 Join Date: 5/25/20 Recent Posts
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YJ
Yoan Jericko, modified 1 Year ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 16 Join Date: 9/26/19 Recent Posts
the model didn't represeting the stratification. Can you have some ideias why? I already change the Wind drag Cof., the vertical vescosity and diffusivity, and a lot of other parameters auto clicker word unscrambler jumble solver.
YY
YENNIS YULIETH YULIETH BARROS ATUESTA, modified 6 Months ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 1 Join Date: 2/22/19 Recent Posts
Hi Yoan. Did you solve your  problem? I have the same and actually, I don't know why could be this.
ML
Martino Lorenzo, modified 9 Months ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 1 Join Date: 2/15/20 Recent Posts
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Lucille Parham, modified 7 Months ago.

RE: Modelling heat exchange of a stratified lake

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Kayla Cook, modified 6 Months ago.

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Iona Springer, modified 5 Months ago.

RE: Modelling heat exchange of a stratified lake

Youngling Posts: 1 Join Date: 6/14/20 Recent Posts
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James Ross, modified 3 Months ago.

RE: Modelling heat exchange of a stratified lake

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RE: Modelling heat exchange of a stratified lake

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