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.

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D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


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substance file for sediments

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substance file for sediments
Answer (Unmark)
3/7/14 8:44 AM
Hello,

I am trying to set up a very simple model for sediments with only sedimentation and erosion on.
When making the substance file, although it is quite clear for sedimentation I am not very sure about erosion.
What parameters do I have to tick in process Transport S1-S2 so that I can get in the editable process parameters of GUI the critical shear stress for erosion and the zeroth order resuspension flux?
I am asking because I see that in the available default file for sediments these parameters are activated but when I am trying to make my own I cannot get them.
And also, why in Transport S1-S2 the total resuspension flux DM from layer S is available twice? what is the difference?

Thank you in advance,

Costas
RE: substance file for sediments
Answer (Unmark)
3/17/14 9:35 PMas a reply to costas matsoukis.
Hi Costas,

What parameters do I have to tick in process Transport S1-S2 so that I can get in the editable process parameters of GUI the critical shear stress for erosion and the zeroth order resuspension flux?

After selecting the substances (IM1, IMS1 and maybe IMS2) you should activate process Sed_IM1 (sedimentation of IM1). In the configuration of this process you can make Tau editable or choose to have it computed by process 'CalTau'.

why in Transport S1-S2 the total resuspension flux DM from layer S is available twice? what is the difference?

This is a minor bug in the GUI that cuts of the description strings. So the first one is actually: 'total resuspension flux DM from layer S1' and the second one: 'total resuspension flux DM from layer S2'

The value of these fluxes can be imposed or computed by process Res_DM. If you go for Res_DM, you will find the zeroth order resuspension flux as one of its input parameters.

Hope this helps.
RE: substance file for sediments
Answer (Unmark)
4/5/17 5:13 PMas a reply to Christophe Thiange.
Hi Christophe,

It has been a while since this thread was posted. But I have the exact same answer as Costas, but you answer on the question about the critical shear stress for erosion does not the issue for me.

I also have to model some very basic sedimentation and erosion with three substances IM1, IM2 and IM3. The like Costas it is easy to find where adapt the critical shear stress for sedimentation, but the "critical shear stress for resuspention" cannot be found, strangely enough. I suspect it to be somewhere in the configuration for "Resuspention, transport in S1-S2 IM".

So the define my question: how can I turn on the "critical shear stress for resuspension", which is defined in N/m2? Should I maybe turn on a different setting before I can turn on this setting?

Thank you in advance,

Huub
RE: substance file for sediments
Answer (Unmark)
4/13/17 12:09 PMas a reply to Huub Rijper.
Hi,

With resuspension you need an extra process to be switched on to calculate the total mass of sediment material that resuspends into the water column using the Res_DM process. Based on the actual composition of the sediment layer, the fractions of IM1/2/3 are used to determine how much of each is actually resuspended. The "critical shear stress for resuspension" is part of that extra process. After selecting it as the input for 'total resuspension flux DM, you can find it when pressing the extra process button on the main screen, and go to the Res_DM process
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Attachments: extra processes button.png (25.0k), extra processes.png (21.0k), res_dm.png (25.2k)
RE: substance file for sediments
Answer (Unmark)
4/13/17 2:58 PMas a reply to Michelle Jeuken.
Thank you very much Michel! This has resolved my problem. Many thanks!

Huub