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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bridges scour

VM
vladimir moya, modified 9 Years ago.

bridges scour

Youngling Posts: 3 Join Date: 5/31/11 Recent Posts
Hi does someone know about bridge scour experiences done with Delft3D
How can I model the long term aggradation - deggradation
Mohamed Yossef, modified 9 Years ago.

RE: bridges scour

Youngling Posts: 23 Join Date: 2/23/11 Recent Posts
Hi Vladimir
Your question about modelling bridge scour is not very clear to me.
If you mean local scour around bridge piers: In principle, Delft3D is not intended for such studies. Nevertheless, we were able to calculate qualitatively satisfactory results when using a fine grid.
If you mean constriction scour, Delft3D is able to predict this effect.

Long-term aggradation / degradation (erosion/deposition) is indeed possible to calculate with Delft3D.

Mohamed
VM
vladimir moya, modified 9 Years ago.

RE: bridges scour

Youngling Posts: 3 Join Date: 5/31/11 Recent Posts
hi
It was about local scour
Is there any paper or publication about this?
guess the grid should be very fine and also with small time step. So guess the simulations might time quite time consuming
Mohamed Yossef, modified 8 Years ago.

RE: bridges scour

Youngling Posts: 23 Join Date: 2/23/11 Recent Posts
Hi Vladimir
Most of the work done in this respect is in internal projects in Deltares. However, you may find an example for modelling morphology near groynes in:
- Yossef, M.F.M (2005) Morphodynamics of rivers with groynes. PhD Thesis, Delft University of Technology, Delft University Press, ISBN 90-407-2606-x. [chapter 6, http://repository.tudelft.nl/view/ir/uuid%3Aa1016625-5503-41df-b80e-dc4de15cb0d7/]
- Yossef, M. F.M., and Rupprecht, R (2006) “Modelling the morphological interaction between a river and its groyne fields” in: River Flow 2006 - Proc. of the 3rd Int. Conf. on Fluvial Hydraulics, Lisbon, Portugal.

Both studies used Delft3D. Though we were not looking specifically at the scour development, we could observe that there is a scour hole developing near the tip of the groyne that qualitatively resembled observations.

regards
Mohamed Yossef