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

Questions regarding Water level change and Hs=0

Deepshikha Dalchand, modified 5 Years ago.

Questions regarding Water level change and Hs=0

Youngling Posts: 1 Join Date: 3/16/15 Recent Posts

I am a Master's student who is doing her thesis using Delft FLOW coupled with WAVE. I am quite new to the software so I apologize in advance for the newbie questions posed by me. emoticon

I have two questions for 2 different models I am attempting to make:
1. The thing is, I am trying to make a model for a bay area where there is also a discharge of a major river system. So, I have three boundaries, one of which is
water level type with astronomic forcing, another Reimann with astronomic forcing and the last one is total discharge with time-series. However, I keep
running into this error message:

No convergence in UZD at tstep: 3
*** WARNING No convergence in DIFU for resp. constituent nr. & tstep:
Water level change too high > 99.00 m (per 0.5 DT) after 7 timesteps in the following points:

I have tried remaking the grid multiple times, as well as decreasing the time step, but I always get this error message and then FLOW aborts. I tried checking
the bathymetry but the depth file was made from the interpolation of the bathymetric points through QuickIn, There are areas where there is a bit of a steep
rise in depth as it is the start of a submarine canyon, so I am not sure if this could be related to the problem?

2. I have another model, and for this Delft FLOW coupled with WAVE completes successfully. For both of the models I am using a Wavecon file, however for
this model, the Hs(m) computed=0 throughout. I have been unable to understand why this could be happening.

I would be extremely grateful if anybody could help me with these queries and point me in the right direction, please.

Thank you!
Warm regards,
Bay model