Performance evaluation of horizontal sharp crested weirs in a channel bend
by Maryam Abdolahpour; Mehdi Yasi; Javad Behmanesh; Mitthan Lal Kansal
International Journal of Hydrology Science and Technology (IJHST), Vol. 2, No. 4, 2012

Abstract: In some cases, construction of weirs and diversion structures in river bends is inevitable. There are a number of such hydraulic structures which were installed around the river bend without considering the undesirable effects of these structures on the river morphology which resulted in serious problems like that of erosion, sedimentation and non-symmetrical distribution of flow where water intakes are required on both sides of the river banks. The main hypothesis for uniform flow distribution across the bend and along the weir crest is changing the weir crest profile from horizontal to sloping. Most of times, this criterion is neglected. In this study, performance of horizontal sharp crested weirs in a 90-degree bend channel is discussed. An experimental set up was prepared in which channel width was taken as 1 m with a 9 m straight reach on the upstream with a depth of 60 cm. The results show the non-uniform flow distribution along the bend with non-symmetric distribution of water depth across channel width. Since at present there is no criterion for location of control section in the bend, this study presents new criteria for suitable place of control section of sharp crested weirs in the bendway. It was found that the control section of sharp crested weir in the bendway lies in the range of 2.6 to 3.0 times of h_max. It was also found that the direction of control section is not parallel to weir in the bendway.

Online publication date: Sat, 16-Aug-2014

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Hydrology Science and Technology (IJHST):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com