Experimental investigation on the effect of curvature of bend on bed topography in 90 degree bend

Document Type : Research Paper


1 Assistant Professor, Department of Civil Engineering, Persian Gulf University, Bushehr,Iran

2 Professor, Water Engineering Research Center, Tarbiat Modares University, Tehran, Iran


Rivers are main sources of water supply. Recognition of   rivers behavior and their changes, particularly in Curved channels, is critical. In this paper, results of experiments on scour pattern in a 90 degree bend are discussed.  Experiments have been carried out in a channel with three different radiuses of curvatures, including mild, moderate and steep. Bed topography has been measured by Laser Bed Profiler. Comparison between different lateral sections, longitudinal sections and bed topography has been made and scouring pattern is analyzed. The results indicate that reduction of radius of curvature of the bend leads to increase of bed topography changes and sedimentation and scouring rates. Also, scour can be seen along downstream straight channel and near the outer bank; however, this is more evident in the steeper bend.


Volume 33, Issue 2
October 2011
Pages 93-112
  • Receive Date: 24 May 2010
  • Revise Date: 24 February 2018
  • Accept Date: 31 October 2010
  • Publish Date: 23 October 2010