Journal of Marine Science and Technology

Journal of Marine Science and Technology

Investigation of the effect of the Bandal-like permeability on the maximum scour depth in a 90 degree bend and in submerged condition

Document Type : Original Manuscript

Authors
Parisa Koochak
Seyed Mahmood Kashefipour
Mehdi Ghomeshi
Ahmad Fathi
Shahid Chamran University of Ahvaz, Iran
10.22113/jmst.2017.60804.1897
Abstract
One of the ways to control the erosion in the outer bend of rivers is to use spur dikes. In recent years, the efficiency, affordability and environmental suitability of traditional spur dikes has been criticized. Therefore the importance of adopting methods which are both cost-effective and eco-friendly has been addressed. The bandal-like spur dike is a combination of a permeable and an impermeable spur dike, which is usually used in Indian Sub-Continents for riverbank protection and improvement of navigation conditions in alluvial rivers. It is made of bamboo therefore it is inexpensive and environmental friendly. In this research the effect of the permeability percentage of the bandal-like structure on the maximum scour depth around it in a 90 degree mild bend flume and in submerged condition is investigated. Therefore a series of impermeable spur dikes (0% permeability) and bandal-like structures with (33,50 and 64) percent permeability are placed in the flume and examined under four different Froude numbers (0.21, 0.23, 0.26, 0.29). The results showed that the maximum scour depth around the bandal-like structure is considerably less than the maximum scour depth around impermeable spur dikes. Also by increasing the permeability percentage of the bandal-like structures the maximum scour depth around it decreases.
Keywords
Bandal-like spur dike
90 degree bend
submerged condition
Maximum scour depth

Subjects

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  • Receive Date 05 September 2016
  • Revise Date 16 November 2017
  • Accept Date 28 November 2017
  • Publish Date 22 May 2018