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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Delft3D-PART stormwater outlet in a lake

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Delft3D-PART stormwater outlet in a lake
delft3d-part
Answer (Unmark)
10/13/16 6:42 PM
Hello,

I have a couple of questions about the Delft3D-PART. So here is the general idea of the modelling, I am trying to model a storm-water outlet in a lake, with fine particles (range 90 micron) to see where they settle. Since I was planning on modelling them as non cohesive particles :

- Is it pertinent to keep with the Delft3D-PART, which is convenient because of the zoomgrid, and the bottom layer, or would you suggest any other module, like the FLOW with sediments?

- Since the settling velocity equation is for cohesive particles in PART, is there a relation between the factor A_0 and the particle size, when the n coefficient is set to 0?

- PART is stochastic, does it give the average simulation of many or is one suppose to run it several times?

- PART also allows different parameter to be defined regarding the wind, how does it change from the wind field given in FLOW, does the wind need to be re-specified?

Also, could you help me with the distinctions, between PART and FLOW for the following aspects :

- Is there a difference in the behavior of the bottom layer?
- Is there a way of introducing time varying discharge of sediments from an outlet since it is one the main aspects of the project?
- Is there a way of working with Z layers and sediments, in FLOW, since stratification processes are important in lakes?

If you have any literature regarding these matters, it would be highly appreciated.

Thank you in advance for your help,

Oriane
RE: Delft3D-PART stormwater outlet in a lake
Answer (Unmark)
10/17/16 9:56 AMas a reply to Oriane Etter.
I will ask my colleague who is more knowledgeable about PART to have a look at your questions. (I could answer a number of them myself, but not all ;)).
RE: Delft3D-PART stormwater outlet in a lake
Answer (Unmark)
3/31/17 11:14 AMas a reply to Oriane Etter.
This was a very old post, but I hope my replies (in red) can help others

Michel

Oriane Etter:
Hello,

I have a couple of questions about the Delft3D-PART. So here is the general idea of the modelling, I am trying to model a storm-water outlet in a lake, with fine particles (range 90 micron) to see where they settle. Since I was planning on modelling them as non cohesive particles :

- Is it pertinent to keep with the Delft3D-PART, which is convenient because of the zoomgrid, and the bottom layer, or would you suggest any other module, like the FLOW with sediments?
PART can be very well used for this, but there is also (DEL)WAQ to model sediments and settling. I believe FLOW w morphology is more suitable for longterm dynamics with feedback of changing bathemetry

- Since the settling velocity equation is for cohesive particles in PART, is there a relation between the factor A_0 and the particle size, when the n coefficient is set to 0?
Sorry, can't answer this one too. But please do check the max and min values for settling. I believe that the defaults are 0.0, zo no matter what the other paramters are, you will always end up with zero if minV=maxV=0.0

- PART is stochastic, does it give the average simulation of many or is one suppose to run it several times?
IT is more in the number of particle that represents part of the mass you release into the lake. If you use more particle, your mass is divided into more packages of mass, and you get finer results. A particle of package of mass can only be on one location, and to represent diffusion, part of the particles has to go in one direction, and part in the opposite direction

- PART also allows different parameter to be defined regarding the wind, how does it change from the wind field given in FLOW, does the wind need to be re-specified?
unfortunately it does. I don't have the description of connection spatial wind at hand, but if you have uniform wind, you should be able to do it in the user interface

Also, could you help me with the distinctions, between PART and FLOW for the following aspects :

- Is there a difference in the behavior of the bottom layer?
with part there is no feedback from the bottom layer to bathemetry
- Is there a way of introducing time varying discharge of sediments from an outlet since it is one the main aspects of the project?
yes, add a continuous release. You can only give a fixed concentration, and a time variation for the discharge. PART uses q*, so you can switch it around, or simply use 1 for the concentration, and specify a time series with the mass/time.
- Is there a way of working with Z layers and sediments, in FLOW, since stratification processes are important in lakes?
It is possible in FLOW, I'm almost sure (I'm the water quality specialist), but it is not possible to use z-layer FLOW output in PART (yet)

If you have any literature regarding these matters, it would be highly appreciated.

Thank you in advance for your help,

Oriane