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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

Tidal phase not matching predicted

Nick DiCosmo, modified 2 Years ago.

Tidal phase not matching predicted

Youngling Posts: 2 Join Date: 11/17/16 Recent Posts

I have run a model based on bathymetry from the east coast of the USA. My offshore (East boundary) boundary extends into the ocean just past NDBC buoy 44091 (Barnegat, NJ). I forced my East boundary with two tidal time series, each applied to one of the offshore corners. My model ran through fine and produced zero errors.
I extracted the tidal signal from the model at the location of buoy 44091 and compared the model data to the predicted tide for buoy 44091. The general shape of the signal matches for model vs. predicted tide. However, there is some strange time offset that appears to be present and the model data looks very strange at the beginning of the model time series (see figure attached). Instead of following the predicted tide signal right from the start, the model tide seems to behave strangely and is concave down, while the predicted is concave up. Does anyone know why this is happening? Is it something to do with the startup of the model?
Any help with this will be much appreciated!!

Joseph Morrow, modified 2 Years ago.

RE: Tidal phase not matching predicted

Youngling Posts: 5 Join Date: 11/16/16 Recent Posts
Greetings, looking at the plot, do you have a UTC/EDT time zone discrepancy?