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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


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Oscillations of simulated water level and discharge

Dong Liang, modified 1 Year ago.

Oscillations of simulated water level and discharge

Youngling Posts: 4 Join Date: 11/4/14 Recent Posts

I'm working with a model to simulate water level and outflow discharges of a lake. Upstream boundary was set as daily inflow discharges and downstream boundary was set as daily water level at outlet. I set the time step and output results interval to be 1min and run the model for a year.  Then oscillations were found in the results( as shown in the picture).

I'm asking for help to make the results more smooth. Was the oscilation caused by the time scale of boundary setting?