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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

confusing paragraph on Page 59 of the D-Water Quality User Manual

U
Zhanxian Wang, modified 2 Years ago.

confusing paragraph on Page 59 of the D-Water Quality User Manual

In the D-Water Quality User Manual Page 59 about using the hydrodynamic result (Delft3D), section 5.2:

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Method 1: the builtin coupling

The builtin coupling is the preferred mode of coupling Delft3D-FLOW to D-Water Quality.
With this mode the required input files with the grid layout and the hydrodynamic results are
written directly and therefore a separate coupling step is not needed anymore. There is one
drawback: you have to decide at the start of the hydrodynamic calculation how to aggregate in
time and space (both horizontally and vertically). The other method allows you to store the full
result of the hydrodynamic calculation in so-called communication files and do the coupling
afterwards.

This method can also be used for ’classic’ domain decomposition Delft3D-FLOW calculations
with multiple grids, and for automatic parallel calculations of Delft3D-FLOW.


The builtin coupling is enabled in Delft3D-FLOW via the user-interface using the Export WAQ
input checkbox and the Edit WAQ input button.

This method can also be used for ’classic’ domain decomposition Delft3D-FLOW calculations
with multiple grids, but doesn’t work for automatic parallel calculations of Delft3D-FLOW.
The
output should encompass a representative period with a sufficient time resolution. Examples
of a representative period are a single tide and a spring-neap cycle.
--------------------------------------------------------------------------------------------------------------------

The statements are self-contradicting each other.

Jonathan
AM
Arjen Markus, modified 2 Years ago.

RE: confusing paragraph on Page 59 of the D-Water Quality User Manual

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
You are absolutely right - we will correct it, but the problem now is: which is the right text?
AM
Arjen Markus, modified 2 Years ago.

RE: confusing paragraph on Page 59 of the D-Water Quality User Manual

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
I know now why this negative remark was introduced: when this automatic domain decomposition was first introduced, the corresponding ddb files were not produced along with it. That made it very hard to reconstruct the original grid as necessary for DELWAQ.

I can now correct the text.