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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

Water level modelling is not accurate

Marisela Des, modified 3 Years ago.

Water level modelling is not accurate

Youngling Posts: 1 Join Date: 10/16/15 Recent Posts
Hi all,

My aim is to simulate water masses movements in a coastal region, specifically a large river plume and upwelling/downwelling processes. To do so I run the model in a grid of 260 km height and 170 km wide with a variable resolution of 50x80-550x990 m.

Now I am modelling the tide imposing astronomic water level boundaries (obtained from TOPEX) along the three open boundaries (North, West and South, coastline is in the East) in 79 segments (10 grid cells). The problem is that when I compare the water level measurement at the coast with the modelled ones I cannot reduce the RMSE below the 0.1082 m. I have tried changing the Roughness, the Horizontal eddy viscosity, the smoothing time, the threshold depth and the time step. There is any guide in order to calibrate better tidal models? I know from the bibliography that phase and amplitudes at boundaries may be tuned in order to improve the output, however I have not clear how to do it since I have 79 different boundary segments.

Thank you very much for your help,

Best regards,