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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

Z-layer+Morphology and Nesting

Marina Amadori, modified 3 Years ago.

Z-layer+Morphology and Nesting

Youngling Posts: 1 Join Date: 9/17/15 Recent Posts
Hello everybody,

I would like to use the morphology module in combination with the Z-layer model on a large stratified lake both to evaulate the changes in the shores morphology and keep the fixed layer discretization.
When I try to do this I get an error message from the GUI (version 4.01.00) saying that "adding sediment consituents will reset the layer model to sigma layer", but if I manually change the mdf I am able to run the simulation. Then my questions are:

1. Is there a kind of mismatching between what the GUI allows me to do and the version of delft3d-flow? If yes, has the MOR+Zmodel combination been fully tested?

2. As I am interested only on the effetcs of sediment transport in a small portion of the lake, can I simulate two nested domains in such a combination? Is there anything I must take into account in using the nesting toolbox, given that I have troubles with the GUI?

Thank you,
Qinghua Ye, modified 3 Years ago.

RE: Z-layer+Morphology and Nesting

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Marina,

Morphology using z-layer model is still a beta function, which means it is not fully test. Thus you are right, not all the functions can be specified through GUI. You are most encouraged to edit the text-based mdf file.

For the 2nd question, you can use the nesting or domain decomposition. But keep in mind that you can only use the same layer type for overall model and the nested model. For nesting, you might have to very careful to choose the boundary conditions. GUI in this case, again, is just one of the option, and you are still encouraged to use mdf files.

Hope this is helpful,