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

Waves forces and spurious alongshore current

Antonio Ruiz, modified 3 Years ago.

Waves forces and spurious alongshore current

Youngling Posts: 1 Join Date: 12/4/14 Recent Posts

I would appreciate some help related to this issue:

- I ran a coupled model (Flow+Wave) based on a simple bathymetry (plane and symmetrical beach, east-west orientation). All forces I used are orthogonal to this beach, so only velocities in v-direction (south-north in my model) were expected.

- To reduce boundary effects I set a nested grid (coarser grid only for waves; a finer grid for flow and waves actions).

After running this model, a horizontal (u-direction) current appears close and parallel to shore, because of waves forces for Hsig>2 m (Jonswap spectrum). These forces are originated in coarser grid boundaries and I cannot eliminate them by increasing roughness or enlarging coarser domain.

Any idea why this happens?

Thanks in advance. Best regards,