Journal of Marine Science and Technology

Journal of Marine Science and Technology

Laboratory investigation on the effect of depth-placed riprap on its stability for protection of Spur Dike in 90° Bend in order to using in navigable Rivers and Gulfs

Document Type : Original Manuscript

Authors
Morteza Bakhtiari 1
seyed mahmood kashefipour 2
Mehdi GHomeshi 2
1 Marine Engineering Faculty, Khorramshahr University of Marine Science and Technology
2 Professor of water science Faculty, Shahid Chamran university of Ahvaz
10.22113/jmst.2016.41157
Abstract
One application of spur dikes is ensure navigability of rivers Through regulation and stabilization of sufficient width and depth, balance changes for the development of depth and The radius of curvature.Nowadays, spurs are also employed for promoting environmental conditions along a riverbank. One of the important topics abut spurs is their protection against scouring that has been less studied. One of the simple and economic ways for protection of spur against scouring is using riprap. Riprap is very common because it is easily available, cheap and simple for construction.
Since using, spur dikes to protect riverbanks spatially in bends is very common, This research was carried out in order to investigate the effect of the structure stability. The purpose of this study is evaluation of depth-placed riprap for protection of spur dike in 90° Bend. In order to achieve the research objectives, one riprap size of inch diameter was used. Ripraps are placed in 3 depths ( ), and used for 3 lengths of spur(15%,20% and 25% width of flume), two angles (90 and 120 degree) and three longitude distance (3,5 and 7 times of spur length). Parameters as variables in this study were selected which The results can be used in large rivers, including navigable rivers and the Gulf.
The results showed that stability of ripraps are increased with increasing the depth-placed riprap and angle of spurs, whereas increasing in spur length and longitude distance decreases stability of ripraps.
Keywords
spur
riprap stability
bend
coastal protection
navigation rivers

Subjects

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Journal of Marine Science and Technology
Volume 15, Issue 2
Autumn 2016
Pages 1-19

  • Receive Date 07 November 2013
  • Revise Date 26 December 2015
  • Accept Date 26 December 2015
  • Publish Date 22 August 2016