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: vegetation module for a partially vegetated channel

XC
XIAOCHEN CHEN, modified 2 Years ago.

vegetation module for a partially vegetated channel

Youngling Posts: 1 Join Date: 5/3/15 Recent Posts
Hi there,
I am currently trying to model a channel with vegetation with Delft3D: the vegetation width is 2/3 of the channel width. The model itself runs smoothly however the model result seems no as good as I expected. The flow velocity in the vegetated area is quite similar as the flow velocity at the open channel (non-vegetated area), and velocity difference is only 0.5 cm/s. However, from the experimental data there is larger velocity difference between the vegetated flow and open channel flow, around 10 cm/s. It seems that the vegetation do not have a 'blocking effect' to slow down the flow in the Delft3D model. Can anyone help me with this problem? I attached my vegetation input file with this post also.

By the way I also try to model the channel fully covered with vegetation, but the result is quite good and quite similar with the measurements. Thanks!


Xiaohchen
SM
shabnam mirheidarian, modified 2 Months ago.

RE: vegetation module for a partially vegetated channel

Youngling Posts: 2 Join Date: 7/29/19 Recent Posts
hi, I wanted to model a vegetation patch with diameter 10 cm in a flume with 1 m width, I have the same problem and

The flow velocity in the vegetated area is quite similar as the flow velocity at the open channel (non-vegetated area), I wanted to know could you find the problem or not?

YJ
Yoan Jericko, modified 11 Days ago.

RE: vegetation module for a partially vegetated channel

Youngling Posts: 16 Join Date: 9/26/19 Recent Posts
XIAOCHEN CHEN:

Hi there,
I am currently trying to model a channel with vegetation with Delft3D: the vegetation width is 2/3 of the channel width. The model itself runs smoothly however the model result seems no as good as I expected. The flow velocity in the vegetated area is quite similar as the flow velocity at the open channel (non-vegetated area), and velocity difference is only 0.5 cm/s. However, from the experimental data there is larger velocity difference between the vegetated flow and open channel flow, around 10 cm/s. It seems that the vegetation do not have a 'blocking effect' to slow down the flow in the Delft3D model. Can anyone help me with this problem? I attached my vegetation input file with this post also usa today protonmail.

By the way I also try to model the channel fully covered with vegetation, but the result is quite good and quite similar with the measurements. Thanks!


Xiaohchen
 wanted to model a vegetation patch with diameter 10 cm in a flume with 1 m width, I have the same problem