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

Spatially Varying Reactions

Deon Knights, modified 2 Years ago.

Spatially Varying Reactions

Youngling Posts: 2 Join Date: 3/15/18 Recent Posts
Hello, I am new to Delft. I am developing a model to simulate contaminant removal in an estuary. I have been able to model a homogeneous situation where reaction rates are uniform over the entire domain. Now, I would like specify particular zones in my model where reaction rates are unique. The user manual states that I can use QUICKIN "for preparing and manipulating grid oriented data such as initial conditions or spatially varying process parameters or forcing functions" I have been trying to figure out how to apply this in QUICKIN with no luck. There is a section in the QUICKIN user manual that states "QUICKIN can be applied to specify any spatially varying parameter, which may also be some initial condition or some spatially varying input parameter" However, neither the DWAQ nor the QUICKIN manual explicitly states how to do this. Am I on the right track with approaching this problem? I have considered using Trachytopes for this but that does not get me what I need.

Arjen Markus, modified 2 Years ago.

RE: Spatially Varying Reactions (Answer)

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
In DELWAQ process parameters can have any of the following characteristics:
  • A constant - the same value in space and time
  • A parameter - constant in time but varying over the model area
  • A function of time - constant over the model area
  • A segment function - varying over the model area as well as time

What you are after is a "parameter". If you use the old user-interface, see Sections 5.3.6 and 5.3.8 of the user manual - in the screens this is called a "scalar field". If you are using the new (DeltaShell) user-interface, then see section 4.8.2 in the "D-Water Quality User Manual". The term to look for is "Coverage"