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 loss through boundary

Johnny Coyle, modified 4 Years ago.

Water loss through boundary

Youngling Posts: 1 Join Date: 11/17/16 Recent Posts
Hi all

I am wondering if you can help I have built a model of a tidal harbor with inputs along west and the north east section of the model domain. During model calibration the model runs ok for the initial week then an instability develops where two Neumann boundaries meet. This then causes significant drop in water level at the model edge and other instabilities which spread to cover a large proportion of the domain. DA velocity shows water flow from Inflow boundaries exiting the domain through the Neumann boundaries close to this location. I am in the process of formal model calibration and running different permutations of roughness and this instability only appears for one of the permutations of bed roughness. Boundary conditions are identical.

Has anyone encountered this before? It is causing significant water loss from the domain and am wondering how best to resolve this as it is causing significant water loss from the model domain