Migration status

  • Home Page: Activity map.

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

Calculating Number of active grid cells

Bilal Ahmed, modified 2 Years ago.

Calculating Number of active grid cells

Youngling Posts: 7 Join Date: 2/27/15 Recent Posts
Hi All

I want to calculate the number of active grid cells in my model. For grids formed on simple rectangular areas, it is simple as just have to have the number of m and n points and the get number of grid cells by multiplying (m-1) and (n-1). However, for slightly complicated shaped areas like L or T Shaped (like when you have a river with a tributary, and both are included in the model) geometries, it is not the case. Also, if we have dry cells (i.e., not included in the calculation), how or where can we get the number of active (non-dry) grid cells of a model.

I am sure nobody will come up with the opening of ‘Visualization area’ or ‘RFGRID’ and counting the cells using mouse cursor.emoticon

Good Day