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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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Sub groups
D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


Message Boards

Dredging Activity and Suspended Sediment

LH
Li Haijun, modified 6 Years ago.

Dredging Activity and Suspended Sediment

Youngling Posts: 15 Join Date: 7/4/14 Recent Posts
Hello,
Dredging activities may have great effects on the suspended sediment concentration.
Delft3D can simulate dredging activity and I want to know the suspended sediment as a consequence of the dredging and the changes of suspended sediment concentration after dredging. How can I see the results of suspended sediment changes resulting from dredging?
I did two test simulations with one dredging and another not. But it seems that there was no differences between the two conditions. Does it mean that dredging activities show no impacts on the suspended sediment concentration?
Can you give me some advices?



Thanks
Li Haijun
Bert Jagers, modified 6 Years ago.

RE: Dredging Activity and Suspended Sediment (Answer)

Jedi Knight Posts: 201 Join Date: 12/22/10 Recent Posts
Hi Li,

The dredging and dumping feature moves sediment from the bed in one location immediately to the bed in another location; it was designed mainly to study the impact of dredging and dumping on the long-term morphological evolution. It does not create the suspended sediment dynamics associated with the dredging and dumping operations. To study the suspended transport of the dredged sediment and the impact that it has on the environment is usually studied by adding discharge points to the simulation that represent the source of the suspended sediment.

Best regards,

Bert
LH
Li Haijun, modified 6 Years ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 15 Join Date: 7/4/14 Recent Posts
Hello Bert,

Thank you for your reply.

Just like what you said, I could not seen the changes of suspended sediment concentration in dredging activities. Maybe I should add some discharge points and define the time-series sediment concentration in the dredging areas according to the volume of dredged materials. I will try to do a test simulation later.

Thank you for you great kindness.

Li Haijun
BL
Bright Lamb, modified 8 Months ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 1 Join Date: 3/25/20 Recent Posts
Bert Jagers:

Hi Li,

The dredging and dumping feature moves sediment from the bed in one location immediately to the bed in another location; it was designed mainly to study the impact of dredging and dumping on the long-term morphological evolution. It does  not create the suspended sediment dynamics associated with the dredging and dumping operations. To study the suspended transport of the dredged sediment and the impact that it has on the environment is usually studied by adding discharge points to the simulation that represent the source of the suspended sediment.

Best regards,

Bert

Many thanks for that complete information!
JF
João Paulo Ferreira, modified 4 Years ago.

RE: Dredging Activity and Suspended Sediment

Padawan Posts: 32 Join Date: 10/16/15 Recent Posts
http://oss.deltares.nl/web/delft3d/coast-/-estuary/-/message_boards/view_message/514045/maximized
RR
rishi r, modified 8 Months ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 6 Join Date: 1/8/20 Recent Posts
ou have a great knowledge about the topic! Each and every piece of words are
informative. Looking forward for more updates! 
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Katherine Pyron, modified 6 Months ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 1 Join Date: 5/14/20 Recent Posts
To simulate the suspended sediment as a consequence of the dredging activity (the suspended sediment when the dredging is happening) is a complex phenomenon and many processes are involved, such as, sediment stiring up by the cutting head, mixing by the turbulence caused by the movement of cutting head MCDVOICE
AA
arknic2607 as, modified 3 Months ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 2 Join Date: 8/25/20 Recent Posts
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AA
arknic2607 as, modified 3 Months ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 2 Join Date: 8/25/20 Recent Posts
IA
ijaz ahamed, modified 1 Month ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 11 Join Date: 9/26/20 Recent Posts
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KR
Keerthana Rajesh, modified 1 Month ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 1 Join Date: 10/7/20 Recent Posts
Thank you for the guidelines and suggestions. It's very useful to me.
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