Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier

An experimental study has been conducted on the effectiveness of two types of flow-altering countermeasures placed around a cylindrical pier under clear water condition, which consists of sacrificial piles and submerged vanes. Their arrangements follow the optimal configurations recommended in the p...

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Main Author: Nazanin Shahkarami
Format: Article
Language:English
Published: Semnan University 2019-02-01
Series:Journal of Rehabilitation in Civil Engineering
Subjects:
Online Access:https://civiljournal.semnan.ac.ir/article_2834_29691c330c1015e010fe732f625c80c9.pdf
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author Nazanin Shahkarami
author_facet Nazanin Shahkarami
author_sort Nazanin Shahkarami
collection DOAJ
description An experimental study has been conducted on the effectiveness of two types of flow-altering countermeasures placed around a cylindrical pier under clear water condition, which consists of sacrificial piles and submerged vanes. Their arrangements follow the optimal configurations recommended in the published articles with some modification. The temporal evolution of maximum scour depth and its equilibrium amount around the pile without and with two scour countermeasures were recorded; scour depth reduction rates and changes in bed topography were then computed. It can be concluded that pursuant to the result which has been earned from the experiments of this study, submerged vanes had better performances compare with the sacrificial piles in all of investigated aspects. By applying submerged vanes 75% of the scour only occurred in first 5 minute. Presence of submerged vanes played more efficient role in reducing scour depth as subjected scour depth reduction was 17% more than one subjected to sacrificial piles. The length of changes downstream the pier (L) were 12, 13.2 and 6 times of pier diameter (D) corresponding to pier with no protection, sacrificial piles and submerged vanes respectively, which revealed  the effectiveness of submerged vanes in reducing the area affected by pier scour. Also the maximum changes of bed level were -6.9 cm to 3.9 cm in unprotected pier test, -4.4 to 3.5 cm in protection by sacrificial piles test and -3 to 3.2 cm in protection by submerged vanes.
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spelling doaj.art-eae4ee519cbe46628a6b386348bf6eef2022-12-21T19:23:48ZengSemnan UniversityJournal of Rehabilitation in Civil Engineering2345-44152345-44232019-02-017111012310.22075/jrce.2018.11171.11842834Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge PierNazanin Shahkarami0Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Arak University, Arak, IranAn experimental study has been conducted on the effectiveness of two types of flow-altering countermeasures placed around a cylindrical pier under clear water condition, which consists of sacrificial piles and submerged vanes. Their arrangements follow the optimal configurations recommended in the published articles with some modification. The temporal evolution of maximum scour depth and its equilibrium amount around the pile without and with two scour countermeasures were recorded; scour depth reduction rates and changes in bed topography were then computed. It can be concluded that pursuant to the result which has been earned from the experiments of this study, submerged vanes had better performances compare with the sacrificial piles in all of investigated aspects. By applying submerged vanes 75% of the scour only occurred in first 5 minute. Presence of submerged vanes played more efficient role in reducing scour depth as subjected scour depth reduction was 17% more than one subjected to sacrificial piles. The length of changes downstream the pier (L) were 12, 13.2 and 6 times of pier diameter (D) corresponding to pier with no protection, sacrificial piles and submerged vanes respectively, which revealed  the effectiveness of submerged vanes in reducing the area affected by pier scour. Also the maximum changes of bed level were -6.9 cm to 3.9 cm in unprotected pier test, -4.4 to 3.5 cm in protection by sacrificial piles test and -3 to 3.2 cm in protection by submerged vanes.https://civiljournal.semnan.ac.ir/article_2834_29691c330c1015e010fe732f625c80c9.pdfcountermeasurescylindrical bridge pierexperimental studysacrificial pilessubmerged vanes
spellingShingle Nazanin Shahkarami
Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier
Journal of Rehabilitation in Civil Engineering
countermeasures
cylindrical bridge pier
experimental study
sacrificial piles
submerged vanes
title Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier
title_full Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier
title_fullStr Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier
title_full_unstemmed Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier
title_short Experimental Comparison of Sacrificial Piles and Submerged Vanes as Scour Countermeasures around Bridge Pier
title_sort experimental comparison of sacrificial piles and submerged vanes as scour countermeasures around bridge pier
topic countermeasures
cylindrical bridge pier
experimental study
sacrificial piles
submerged vanes
url https://civiljournal.semnan.ac.ir/article_2834_29691c330c1015e010fe732f625c80c9.pdf
work_keys_str_mv AT nazaninshahkarami experimentalcomparisonofsacrificialpilesandsubmergedvanesasscourcountermeasuresaroundbridgepier