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

The density of cohesive sediment in Delft3D

Anonymous Anonymous, modified 3 Years ago.

The density of cohesive sediment in Delft3D

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Dear all,

I am looking at the formula for cohesive sediment (mud) transport in the FLOW manual. Just something come into my mind, and I’d like to ask you for some comments:

In the input file, the user needs to provide the “specific density” and “Reference density for hindered settling calculations”. I think the latter only affect the hindered settling velocity. Is it correct?

Second, I was wondering how the “specific density” was used in a sediment model. It does not appear in the governing equation if the convection-diffusion equation was solved for the concentration in kg/m3; it does not affect the erosion and deposition either as the erosion rate is in kg/m2/sec (mass per unit area per unit time) and the settling velocity is a user-specified constant.

Any hints are appreciated. Thank you in advance!