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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.

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Sub groups
D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


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Delwaq-Define input-Discharges

GS
Gholamreza Shiravani, modified 6 Months ago.

Delwaq-Define input-Discharges

Padawan Posts: 53 Join Date: 6/25/16 Recent Posts

Hi,

I have a question about Flow rate of discharges in Define Inputs of Delwaq. We couple the hydrodynamic model (Delft-Flow) data with Delwaq. Based on the coupling definition, discharges values from hydrodynamic model are already used in Flow-model  and the current velocity as well as all hydrodynamic parameters like water level, shear stresses are solved with these discharges. Now, should I Input These values again in Delwaq by Define Input in Discharges? Could you please explain me the differences between the discharges in hydrodynamic Model and Delwaq model?Is the delaq model discharges extra Flow rate or we should Input the flow model flow rates againg in Define Inputs by Discharges? Why delwaq automatically select the values of hydrodynamic model in Define Inputs?

AM
Arjen Markus, modified 6 Months ago.

RE: Delwaq-Define input-Discharges

Jedi Knight Posts: 222 Join Date: 1/26/11 Recent Posts

In DELWAQ discharges are exclusively sources of mass. The actual water volume associated with a discharge has to be in the hydrodynamic model. In that respect the flow rate as you specify it in the input for DELWAQ is merely a convenience: you can then specify the flow rate and the concentration instead of the mass per second.

There is more to it, as you can also specify extractions and other variations, but for that I refer to the manual.

Not all discharges that are of interest to water quality may be incorporated in the hydrodynamic model - say you have a discharge that is not going to influence the flow field in any way, but is quite polluted, such as the discharge of untreated wastewater. That sort of discharges can be defined independently of the hydrodynamics.

If the discharge is defined in the hydrodynamic model, it is probably best to accept the discharge rate from that calculation and simply add information on the concentrations for the various substances.

 

GS
Gholamreza Shiravani, modified 6 Months ago.

RE: Delwaq-Define input-Discharges

Padawan Posts: 53 Join Date: 6/25/16 Recent Posts

Thanks a lot Arjen. Then, Delwaq will not change the hydrodynamic properties and will only calculate the mass-transport based on hydrodynamic Information from Flow Modell. 

AM
Arjen Markus, modified 6 Months ago.

RE: Delwaq-Define input-Discharges

Jedi Knight Posts: 222 Join Date: 1/26/11 Recent Posts

Yes, that is right. If you do not specify the concentration, then actually a value of zero will be used, essentially diluting the surrounding water as it were.