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

Steep slope from deep water to coastline

Hanieh Mohamadi Moghadam, modified 3 Years ago.

Steep slope from deep water to coastline

Youngling Posts: 4 Join Date: 8/20/17 Recent Posts
Dear Delft3D users,

I want to model hydro+wave with a slope of 27 percent from deep water to the coastline. I use Domain Decomposition technique with an 300mX500m rectangular domain and 2mx2m grid size as outside domain and an 98mX200m rectangular domain and 0.5x0.5m grid size as inside domain. With this spatial resolution, I tried different time step ranging from 0.2 min to 0.02min, however I keep receiving "Water level change too high" error. I assume there must be something wrong with the courrant number, but I don't know how to fix it.
I know the slope is very steep and I was wondering if anybody has similar problem.
The boundary con. is Water Level for the offshore side and Neumann for the lateral sides and nothing (open boundary) for the coastline.
I really appreciate if you give me your advice on how to fix this error.