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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

layer wise thin dam input

Binata Roy, modified 1 Year ago.

layer wise thin dam input

Youngling Posts: 4 Join Date: 11/6/16 Recent Posts
Dear Fellow Researchers,

I have developed a 3D model of Jamuna River of Bangladesh using 5 layers. Now I want to put a semi permeable bundal structure in my model using thin dam in upper 2 layers and keeping the lower layers free. But I am finding no such option in Delft3D. So my question is " is there any option of providing block in upper 2 layers and keeping the lower 3 layers free?" If you know please let me inform. I am badly in need of this technique.

Binata Roy
Lecturer, IWFM, BUET
Bilal Ahmed, modified 1 Year ago.

RE: layer wise thin dam input

Youngling Posts: 7 Join Date: 2/27/15 Recent Posts
Hi Roy

I am not quite sure, but I think it is only possible when you use this structure as a boundary condition. Then do following

  • Define boundary condition
  • For flow conditions set the following

    Type of open boundary (quantity) = Discharge per cell
    Forcing type = Time series
    Vertical profile for hydrodynamics = Per layer specified
  • Go to ' Edit Flow conditions' to open the window with title 'Boundaries: Flow Conditions'
  • Now You can define flow through each layer

So according to your case probably it would be like setting flow through layer 1 and 2 to zero and then define flow through rest of layers.

Hope it works.

Binata Roy, modified 1 Year ago.

RE: layer wise thin dam input

Youngling Posts: 4 Join Date: 11/6/16 Recent Posts
Dear Ahmed,

Thank you for your cooperation. But mine is a structure whose characteristics match with the thin dam feature of delft3D. Do you know whether this structure will resemble with the boundary coundition of flow?