Author(s): Bijan Dargahi

Linked Author(s):

Keywords: Groynes; river training; sedimentation; two-dimensional models; vanes

Abstract: The study focuses on the sedimentation problems found in the lower reach of the River Klarälven, where the river bifurcates into a west and an east channels at the city of Karlstad. During a period of thirty years, the sediment transport capacity of the west-channel has gradually diminished. This has caused a growing concern about the risk of flooding in the city. The study has aimed to find relevant methods for both increasing the hydraulic capacity of the west river channel, and mitigation of sedimentation problems.The main approach was numerical flow and sediment transport modelling. A two-dimensional depth-averaged modelwas used to study the influence of various river training measures. The modelwas found effective to address the sedimentation problem and the reduced hydraulic capacity in the river. To mitigate these problems, two effective engineering methods were controlling the water levels by partial gates and the use of groynes or vanes. The results suggested that a carefully calibrated and verified 2-D depth-averaged model can be used in supporting river restoration works and flood alleviation schemes.

DOI: https://doi.org/10.1080/00221686.2008.9521857

Year: 2008