Migration status

  • Home Page: Activity map.

intro story DELWAQ

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.

** PLEASE TAG YOUR POST! **

 

 

Sub groups
D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


Message Boards

The difference between them was the vertical coordinate, one sigma and the

LS
LUIS HENRIQUE SILVA, modified 6 Years ago.

The difference between them was the vertical coordinate, one sigma and the

Youngling Posts: 12 Join Date: 9/30/11 Recent Posts
Dear Adri,
I carried out two experiments, both forced by tide (amplitude and phase)
prescribed at a file *.bca. Both with 1 layer, size 92X91, barotropic. The
difference between them was the vertical coordinate, one sigma and the
other Z.

I think the results should be the same, but they are different: the run with
sigma coordinate was noisy ... Please, have a look in the figures, where the
water level is shown after an integration of 15 days.

Do you know what is happening ?

regards

Luis
Adri Mourits, modified 6 Years ago.

RE: The difference between them was the vertical coordinate, one sigma and

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Luis,

That looks very weird indeed.

Although both calculations are with one layer, the actual algorithms are really different. The Z-layer algorithm is more explicit.If you use the same timestep for both simulations, I expect the sigma-model to produce better results, which does not seem to be the case.

What happens if you reduce the time step?

If you scan the output between t=0 and t= 15 days, is there a point in time and/or space where it starts to become ugly?

Regards,

Adri