Modelling Rivers

River

Rivers are natural water courses. They have vital contributions to the social and economical welfare of societies living along their course. They provide continuous, usually dependable, flow and supply of water. Accordingly, centralised civilisation began emerging independently along number of river valleys; e.g. the Nile, Tigris and Euphrates, the Indus and the Yellow Rivers. Since then, mankind has been in continuous struggle to understand and live in harmony with this gift/force of nature. Modelling rivers is the modern way to understand their behaviour and is an essential tool to tackle several river problems.

Delft3D is the state-of-the-art modelling framework for hydrodynamics, water quality, ecology, waves and morphology.
 
Here, in this space, we share knowledge & experiences, and discuss issues related to modelling of rivers.
 
 

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


 

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vegetation module for a partially vegetated channel

XC
XIAOCHEN CHEN, modified 3 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 8 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 5 Months 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