intro story 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.




Sub groups
D-Flow Flexible Mesh

Cohesive sediments & muddy systems


Message Boards

DELWAQ-PART:Assigning multiple fractions with different settling velocities

Ben Williams, modified 4 Years ago.

DELWAQ-PART:Assigning multiple fractions with different settling velocities

Jedi Knight Posts: 114 Join Date: 3/23/11 Recent Posts

I have two questions about the particle tracking model in Delft3D (classical version).

1) One is able to specify multiple sediment fractions in the particle tracking module. Each fraction has a associated settling velocity. This is useful for tracking, for example, the movement of silt and mud fractions in dredge disposal operations.

However the particle tracking model seems to have a fundamental flaw: If one specifies multiple fractions with various settling velocities, it calculates the average and then assigns that single value to all particle fractions.

Is there a way around this flaw? At present I am simulating each fraction individually, which is laborious when combining together again afterwards.

2) There are a lot of extra files (such as the 'map' file) that are not needed to post-process the results. It seems to be an exact copy of the '.dat' file also produced. Thus doubling the amount of space taken up on the hard drive. Is there a way to suppress the generation of particular files?

3) Is the particle tracking model for Delft3D-FM going to be less brain-dead and more space efficient?

Best regards,

Michel Jeuken, modified 4 Years ago.

RE: DELWAQ-PART:Assigning multiple fractions with different settling veloci (Answer)

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts
1) Each particle can have only one settling speed, since it has only one z location. there is no other work around that the one that you mention. It would be nice to have a total concentration from PART directly.

2) It is on the wish list, but there is no scheduled date to implement it.

3) I hope so too