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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


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Tide level in SWAN

Jeff Hansen, modified 5 Years ago.

Tide level in SWAN

Padawan Posts: 29 Join Date: 7/12/11 Recent Posts
I have a relatively small flow domain (~5 km by ~2 km) that is coupled with two nested SWAN domains, one just slightly larger than the flow domain and one that is quite large (~25 km by ~16 km) that encompasses much of the adjacent continental shelf. Wave angels in this area are often steep such that my largest wave domain extends well up and down coast from my flow domain. The problem I am having is that the coast bends inland away from my flow domain which is causing problems with the water level coupling. As the continental shelf is relatively shallow in this area I would like to include tidal level changes from the flow domain in both wave domains. Usually this isn't a problem when specifying "use and extend" for the water level in the flow-wave coupling settings. However, since the coast bends inland away from the flow domain no water level is provided to areas inland of the flow domain in the large wave domain despite these being wet cells. The resulting discontinuity in the water level results in an unrealistic wave field that ultimately causes problems in the flow domain.

Is there any way to extend the water level from the flow domain to all wet cells in the wave domain? The hack that I could implement is to "intercept" the SWAN input file using a script in the bat file and add the tide level through the "SET LEVEL" command in SWAN. This approach is rather brute force so it seems as if there should be an easier solution.
Any ideas?