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

Thatcher-Harleman time lag in WAQ

Amelia Araujo, modified 5 Years ago.

Thatcher-Harleman time lag in WAQ

Youngling Posts: 13 Join Date: 7/7/15 Recent Posts

I have used the value of -1 min for the Thatcher-Harleman time lag boundary condition in FLOW because I want a zero gradient at the boundaries. Now I would like to set up the same boundary condition in WAQ. How can I do that (here the format for time lag has to be hh mm ss)?

Anonymous Anonymous, modified 5 Years ago.

RE: Thatcher-Harleman time lag in WAQ

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Amelia,

Not sure I understood your question correctly, but if you want no time lag at all just use "00 00 0000 00 00 00" in the GUI (or 000000000000000 in the *.inp).

tyron woodley, modified 11 Months ago.

RE: Thatcher-Harleman time lag in WAQ

Youngling Posts: 15 Join Date: 3/14/20 Recent Posts
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