The Effect of Relative Spur Height and Length on The Riprap Stability Around The Submerged Spur Dike in a 90° Bend
Spur dikes are hydraulic structures, which are built across the river from river bank towards centerline in order to protect the river bank from erosion, natural development of amending the river side, special protection of local structures, navigation and environmental rehabilitation of river. The...
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Shahid Chamran University of Ahvaz
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doaj-018e9e81bd894d41868aabf2f3af38dc2020-11-25T03:11:28ZfasShahid Chamran University of Ahvazعلوم و مهندسی آبیاری2588-59522588-59602015-05-01381213010.22055/jise.2015.1115011150The Effect of Relative Spur Height and Length on The Riprap Stability Around The Submerged Spur Dike in a 90° BendEbtesam Jasemi Zargani10Seyed Mahmoud Kashefipour1Mahmoud Shafai Bejestan2دانشجوی دکتری سازههای آبی دانشکده مهندسی علوم آب دانشگاه شهید چمران اهوازاستاد دانشکده مهندسی علوم آب دانشگاه شهید چمران اهوازاستاد دانشکده مهندسی علوم آب دانشگاه شهید چمران اهوازSpur dikes are hydraulic structures, which are built across the river from river bank towards centerline in order to protect the river bank from erosion, natural development of amending the river side, special protection of local structures, navigation and environmental rehabilitation of river. The main job of these structures is to divert the flow away from the bank and towards centerline of river. However, the velocity will increase and the complicate vortex will be formed around the spur nose and the protection of spur dikes against scouring and their stability is very important. Using riprap is the most common and economical method for spur dike protection.In this study the effect of relative height and length of the submerged spur dikes on riprap stability is investigated. The experiments were carried out in a laboratory flume with 90° bend and R/B=4.0. Six sizes of ripraps including 5.5, 7.9, 11.1, 14.3, 17.9, and 22.2 mm, with three relative spur length (15%,20% and 25% of the flume width) and four dischrge (25,29,32 and 36 lit/s) were used. The results showed that the larger riprap failed for the higher relative spur height. With increasing the relative spur length the riprap stability decreased. Finally an experimental equation was developed based on the relative spur height and length and riprap size, which can be applied for designing of riprap size.http://jise.scu.ac.ir/article_11150_9b93eddc63950f7f8361ac3e9da3e9aa.pdfsubmerged spur dikeriprap stabilityrelative spur heightriver bend |
collection |
DOAJ |
language |
fas |
format |
Article |
sources |
DOAJ |
author |
Ebtesam Jasemi Zargani1 Seyed Mahmoud Kashefipour Mahmoud Shafai Bejestan |
spellingShingle |
Ebtesam Jasemi Zargani1 Seyed Mahmoud Kashefipour Mahmoud Shafai Bejestan The Effect of Relative Spur Height and Length on The Riprap Stability Around The Submerged Spur Dike in a 90° Bend علوم و مهندسی آبیاری submerged spur dike riprap stability relative spur height river bend |
author_facet |
Ebtesam Jasemi Zargani1 Seyed Mahmoud Kashefipour Mahmoud Shafai Bejestan |
author_sort |
Ebtesam Jasemi Zargani1 |
title |
The Effect of Relative Spur Height and Length on The Riprap
Stability Around The Submerged Spur Dike in a 90° Bend |
title_short |
The Effect of Relative Spur Height and Length on The Riprap
Stability Around The Submerged Spur Dike in a 90° Bend |
title_full |
The Effect of Relative Spur Height and Length on The Riprap
Stability Around The Submerged Spur Dike in a 90° Bend |
title_fullStr |
The Effect of Relative Spur Height and Length on The Riprap
Stability Around The Submerged Spur Dike in a 90° Bend |
title_full_unstemmed |
The Effect of Relative Spur Height and Length on The Riprap
Stability Around The Submerged Spur Dike in a 90° Bend |
title_sort |
effect of relative spur height and length on the riprap
stability around the submerged spur dike in a 90° bend |
publisher |
Shahid Chamran University of Ahvaz |
series |
علوم و مهندسی آبیاری |
issn |
2588-5952 2588-5960 |
publishDate |
2015-05-01 |
description |
Spur dikes are hydraulic structures, which are built across the river from river bank towards centerline in order to protect the river bank from erosion, natural development of amending the river side, special protection of local structures, navigation and environmental rehabilitation of river. The main job of these structures is to divert the flow away from the bank and towards centerline of river. However, the velocity will increase and the complicate vortex will be formed around the spur nose and the protection of spur dikes against scouring and their stability is very important. Using riprap is the most common and economical method for spur dike protection.In this study the effect of relative height and length of the submerged spur dikes on riprap stability is investigated. The experiments were carried out in a laboratory flume with 90° bend and R/B=4.0. Six sizes of ripraps including 5.5, 7.9, 11.1, 14.3, 17.9, and 22.2 mm, with three relative spur length (15%,20% and 25% of the flume width) and four dischrge (25,29,32 and 36 lit/s) were used. The results showed that the larger riprap failed for the higher relative spur height. With increasing the relative spur length the riprap stability decreased. Finally an experimental equation was developed based on the relative spur height and length and riprap size, which can be applied for designing of riprap size. |
topic |
submerged spur dike riprap stability relative spur height river bend |
url |
http://jise.scu.ac.ir/article_11150_9b93eddc63950f7f8361ac3e9da3e9aa.pdf |
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