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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

Water Level Change too high

Niku Guinea, modified 3 Years ago.

Water Level Change too high

Youngling Posts: 2 Join Date: 6/27/16 Recent Posts
Hello, i am trying to model flow in a strait, therefore i made grid according to land boundary file and depth generated from delft dashboard. until this step, the modelling can be run just fine (although the water level is strangely very small, such as -3.03E-15 m.. the problem appears when i tried to add the open boundary which is water level astronomical with tidal constituent data also from delft dashboard. i suspect the error comes from the boundary that i make. can anybody help? i have attached all the files i used in this modelling.

Attachment : https://drive.google.com/open?id=0By31tkEPRVYEX3lOdjJlcXcwUkE
Many Thanks

Qinghua Ye, modified 3 Years ago.

RE: Water Level Change too high

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Niku,

Yes, it is related the boundary conditions you specified.

Coastal models are all about boundary conditions. The expertises are all related to this. For example, refer to http://oss.deltares.nl/web/delft3d/coast-/-estuary/-/message_boards/view_message/91262/maximized#_19_message_420704.

Maybe joining one of Deltares courses will help a bit as well. Refer to http://www.dsd-int.nl/2016/ or https://www.deltares.nl/en/academy/.

I hope this can be a little bit helpful.


Niku Guinea, modified 2 Years ago.

RE: Water Level Change too high (Answer)

Youngling Posts: 2 Join Date: 6/27/16 Recent Posts
Hi Qing Hua,

Thank you for your advice. actually i've solved the problem that is i use cartesian coordinates while i should use spherical coordinates for the grid. and it makes the grid has very low resolution and therefore make the courant number very high.