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Prof. mahmoud refaai :: Publications:

Effect of Groin Geometry on Sand Bed Scouring of Rivers Having 180 Degree Bend
Authors: Mahmoud A. R. Eltoukhy and Neveen B. Abdelmageed
Year: 2015
Keywords: Groin, river erosion, scour depth, groin position, sand beds, discharge variations
Journal: CERM
Volume: 34
Issue: 3
Pages: 880 - 892
Publisher: Journal of Alazhar University
Local/International: International
Paper Link: Not Available
Full paper Not Available
Supplementary materials Not Available

Groins are commonly used at the river bends for controlling erosion along the banks and protecting the adjacent infrastructure. Groins are designed to divert river flows towards its axis, thus reducing stream pressures leading to enhanced protection of river banks. The new flow pattern, however, entails the inherent risk of disturbing the established river regime leading to scouring around the groin. This research was undertaken to investigate the effect of variations of discharges and sand beds on scouring depth at a groin using an experimental flume having a 180 degree bend. The laboratory experimental program used three sands with different median grain sizes, i.e, 0.41, 0.95, 1.6 mm, and three discharge values of 20, 24, and 30 l/s. Whereas, the groin was aligned at 90 degree position, with width of 8 cm. The results pertaining to the effects of discharge and sand median grain size on maximum scour depth were analyzed in the light of previous published data. The results further substantiated that an increase in discharge or decrease in sand median grain size causes an increase in the dimensions of scouring hole around the groin. It is also observed that increasing the discharge or decreasing the sand median grain size leads to increase in the extent and thickness of sedimentation downstream of the groin. This paper shows that, maximum scour depth shows an increasing trend with increasing Froude number.The results are represented by curves and equations to facilitate determination of the maximum scour depth for various discharge and sand bed conditions.

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