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

Delft3d WAVE grid cell centers vs corners

Hannah Snow, modified 3 Years ago.

Delft3d WAVE grid cell centers vs corners

Youngling Posts: 3 Join Date: 9/3/15 Recent Posts

I am hoping someone can clarify which variables in the WAVE module are calculated and exported at grid cell centers versus grid cell corners? I am processing my data in Matlab - when I read in the grid (using the 'wlgrid.m' function) the X and Y coordinates given correspond to grid cell corners. I think that the depth data in the .dep file also corresponds to grid cell corners (although there is an additional dummy row in both dimensions). Is the wave height, period, and other parameters also calculated and exported at the grid cell corners (I am using 'qpread.m' to read in the data to Matlab)? I thought that SWAN calculated wave parameters at the grid cell center (but I could be wrong).

When I use QUICKPLOT to view the data, it appears that the wave parameters are calculated at the corners. I just want to be clear on this because the manual indicates that some variables are not defined at the corners but I wasn't able to find which variables. There is more information in the FLOW manual on grid center vs corners for the FLOW parameters but I am running the WAVE module standalone.

Thank you for any help!