Scour evolution downstream of submerged weirs in clear water scour conditions

Although weirs or dikes in the riverine and coastal environments are frequently overtopped, few studies have hitherto examined the evolution of the scour process downstream of these structures under the submerged condition. This paper presents an experimental investigation on time evolution of the s...

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Main Authors: Guan, Dawei, Liu, Jingang, Chiew, Yee-Meng, Zhou, Yingzheng
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/142819
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1428192020-07-03T01:02:38Z Scour evolution downstream of submerged weirs in clear water scour conditions Guan, Dawei Liu, Jingang Chiew, Yee-Meng Zhou, Yingzheng School of Civil and Environmental Engineering Engineering::Civil engineering Sediment Transport Clear-water Scour Although weirs or dikes in the riverine and coastal environments are frequently overtopped, few studies have hitherto examined the evolution of the scour process downstream of these structures under the submerged condition. This paper presents an experimental investigation on time evolution of the scour process downstream of submerged weirs with a uniform coarse sand. The clear-water scour experiments were carried out in a tilting recirculation flume. Different flow intensities and overtopping ratios (approach flow depth/weir height) were adopted in the experiments. Experimental observations show that the scour hole downstream of submerged weirs develops very fast in the initial stage, before progressing at a decreasing rate and eventually reaching the equilibrium stage. The results show that an increase of the overtopping ratio or flowrate can generate larger scour depth and volume downstream of the weir. Moreover, geometrical similarity of the scour hole that formed downstream of the weir was observed in the tests. Finally, empirical equations for predicting scour hole geometrical evolutions downstream of the submerged weirs were presented. The results of this study are useful in the development of numerical/analytical models capable of estimating the scour depth downstream of weirs in the river or coastal areas, for which the overtopping conditions are present. Published version 2020-07-03T01:02:38Z 2020-07-03T01:02:38Z 2019 Journal Article Guan, D., Liu, J., Chiew, Y.-M., & Zhou, Y. (2019). Scour evolution downstream of submerged weirs in clear water scour conditions. Water, 11(9), 1746-. doi:10.3390/w11091746 2073-4441 https://hdl.handle.net/10356/142819 10.3390/w11091746 2-s2.0-85071365466 9 11 en Water © 2019 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/) application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Civil engineering
Sediment Transport
Clear-water Scour
spellingShingle Engineering::Civil engineering
Sediment Transport
Clear-water Scour
Guan, Dawei
Liu, Jingang
Chiew, Yee-Meng
Zhou, Yingzheng
Scour evolution downstream of submerged weirs in clear water scour conditions
description Although weirs or dikes in the riverine and coastal environments are frequently overtopped, few studies have hitherto examined the evolution of the scour process downstream of these structures under the submerged condition. This paper presents an experimental investigation on time evolution of the scour process downstream of submerged weirs with a uniform coarse sand. The clear-water scour experiments were carried out in a tilting recirculation flume. Different flow intensities and overtopping ratios (approach flow depth/weir height) were adopted in the experiments. Experimental observations show that the scour hole downstream of submerged weirs develops very fast in the initial stage, before progressing at a decreasing rate and eventually reaching the equilibrium stage. The results show that an increase of the overtopping ratio or flowrate can generate larger scour depth and volume downstream of the weir. Moreover, geometrical similarity of the scour hole that formed downstream of the weir was observed in the tests. Finally, empirical equations for predicting scour hole geometrical evolutions downstream of the submerged weirs were presented. The results of this study are useful in the development of numerical/analytical models capable of estimating the scour depth downstream of weirs in the river or coastal areas, for which the overtopping conditions are present.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Guan, Dawei
Liu, Jingang
Chiew, Yee-Meng
Zhou, Yingzheng
format Article
author Guan, Dawei
Liu, Jingang
Chiew, Yee-Meng
Zhou, Yingzheng
author_sort Guan, Dawei
title Scour evolution downstream of submerged weirs in clear water scour conditions
title_short Scour evolution downstream of submerged weirs in clear water scour conditions
title_full Scour evolution downstream of submerged weirs in clear water scour conditions
title_fullStr Scour evolution downstream of submerged weirs in clear water scour conditions
title_full_unstemmed Scour evolution downstream of submerged weirs in clear water scour conditions
title_sort scour evolution downstream of submerged weirs in clear water scour conditions
publishDate 2020
url https://hdl.handle.net/10356/142819
_version_ 1681059793331027968