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

"Error - FlowFM: Roughness contains unspecified points, the calculation..."

Francisco Taveira Pinto, modified 4 Months ago.

"Error - FlowFM: Roughness contains unspecified points, the calculation..."

Youngling Posts: 3 Join Date: 1/29/20 Recent Posts
I am an user of Delft3D Flexible Mesh and I need to build a refined grid in order to draw five detached breakwaters. My question is how refined can my grid be in order to avoid this error, "FlowFM: Roughness contains unspecific points, the calculation kermel will replace these with default values". I already saw some possible solutions to solve this problem. Therefore, I merged circumferences but it made my grid less refined... I will show you my case study so that you can understand what I mean.This is the error:
This is my case study, located in Oporto, Portugal.image.png
These are detached breakwaters under study. My main goal is to study the morphodynamics.image.png
As you can see on the following image, the grid zone where breakwaters are going to be implemented is too refined. I am afraid that FM does not support this high resolution.image.png
I would like to know what can I do to make this study well and solve the problems I mentioned above.Thank you very much.
Best regards,
Francisco Taveira Pinto (Faculty of Engineering of University of Porto)