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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

Boundary conditions flow and salinity

Esther Espinoza, modified 2 Years ago.

Boundary conditions flow and salinity

Padawan Posts: 25 Join Date: 4/6/17 Recent Posts
Hi ! I hope you can help me with something:

I am modeling flow and salinity of a estuary and I have some questions about the data that is needed to start:

Sorry if this is to obvious to ask, but I am starting to use the model

1) For boundary conditions: Is it necessary that both boundary conditions, flow conditions and transport conditions for salinity start and finish at the same time and are located in the same points? Also, If the data for flow is hourly the data for salinity should be hourly too or can it be daily ? I mean for example:

Flow: Time Begin End Salinity Time Begin End

28 04 2016 02 00 00 -1.45 -1.45 20 03 2014 10 00 00 33 33

It would be ok the example above? The thing is that the data available are not in the same monitoring stations, so tide and salinity data are from different locations and probably won't match in dates and times.

2) For the bathymetry data, Does it matter if the spacial resolution is 5 m at one specific zone of the grid and 50 m in the outer part, and then 100 m somewhere else? Which is the necessary resolution for this type of area? Is an estuary with internal channels of approximately 2 km of width and increasing its width until ending like a gulf with several km of width in the mouth.

The problem is that the data available doesn't have the same resolution for all the study area, because they just collect data at the navigation channel and in the outter part the resolution is too coarse, maybe like 200 m or more.

3) Do you have any recommendations or advices to start modeling salinity and flow?

Thank you so much for your help!