intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

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Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

RE: Dredging Activity and Suspended Sediment

LH
Li Haijun, modified 5 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 5 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 5 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 5 Days 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 3 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 3 Days ago.

RE: Dredging Activity and Suspended Sediment

Youngling Posts: 3 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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