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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

DynDepth and z-layers

RH
Rusty Holleman, modified 4 Years ago.

DynDepth and z-layers

Youngling Posts: 4 Join Date: 8/3/15 Recent Posts
I am coupling unstructured z-layer hydrodynamics to DelWaq. In an effort to save disk space, I have DelWaq calculate the depth of segments based on surface area and volume via the DynDepth process. When a surface segment dries out, though, the depth is left as the last depth before it dried out. This depth is still included in the totdepth process, such that totaldepth and localdepth are overestimated. I believe that a fix is to add lines 7-8 below to ddepth.f:


...
DEPTH = VOLUME / SURF
!
      PMSA (IP3 ) = DEPTH
!
      ELSE ! This might fix for dry z-levels
         PMSA (IP3 ) = 0 ! dry cells get 0 depth
      ENDIF
!
      IFLUX = IFLUX + NOFLUX
      IP1   = IP1   + INCREM (  1 )
...


Am I missing some bigger problem, or is there any problem with this "fix"? I'm using r5740 - any chance this has been addressed in a more recent version?

thank you--
MJ
Michel Jeuken, modified 1 Year ago.

RE: DynDepth and z-layers

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
<p>Hi Rusty, You are right about this! It seems that totaldepth doesn&#39;t skip inactive calls( any more?), but dyndepth does. This way old values remain in memory. Your solution works fine, but I think it is better to remove the check on the cell being active, so depth is always calculated, even if the volume/depth is below the threshold: IF (BTEST(IKNMRK(ISEG),0)) THEN I have committed this to the trunk as revision 6071 Thank you for posting this problem!</p>
RH
Rusty Holleman, modified 4 Years ago.

RE: DynDepth and z-layers

Youngling Posts: 4 Join Date: 8/3/15 Recent Posts
Thanks, Michel - I'll switch to your fix.

best,
Rusty
TW
tyron woodley, modified 5 Months ago.

RE: DynDepth and z-layers

Youngling Posts: 16 Join Date: 3/14/20 Recent Posts
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