Simulating channel bifurcation flows with weirs for flood risk reduction

Weir is widely used for controlling the flow discharges and water levels of a bifurcated river for flood risk reduction. The effects of weir on the bifurcation flow properties and hydrodynamic processes were not systematically studied by previous research, some of these have limitations and only sho...

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Main Authors: Ng, Kai Jia, Tan, Cha Yao, Selvarajoo, Anurita, Mohd. Haniffah, Mohd. Ridza, Kasiman, Erwan Hafizi, Lai, Sai Hin, Yuan, Dekui, Teo, Fang Yenn
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Published: Research Laboratory in Subterranean and Surface Hydraulics, University of Biskra 2022
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Online Access:http://eprints.utm.my/id/eprint/102756/
http://larhyss.net/ojs/index.php/larhyss/article/view/820
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Institution: Universiti Teknologi Malaysia
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spelling my.utm.1027562023-09-20T03:50:00Z http://eprints.utm.my/id/eprint/102756/ Simulating channel bifurcation flows with weirs for flood risk reduction Ng, Kai Jia Tan, Cha Yao Selvarajoo, Anurita Mohd. Haniffah, Mohd. Ridza Kasiman, Erwan Hafizi Lai, Sai Hin Yuan, Dekui Teo, Fang Yenn TA Engineering (General). Civil engineering (General) Weir is widely used for controlling the flow discharges and water levels of a bifurcated river for flood risk reduction. The effects of weir on the bifurcation flow properties and hydrodynamic processes were not systematically studied by previous research, some of these have limitations and only showed that the discharge ratios were varied by the changes of weir height. Thus, there is a need to further explore on the effect of overall weir geometry and weir location on flow properties. In this study, an one-dimensional (1D) numerical model of Hydrological Engineering Centre-River Analysis System (HEC-RAS) has been applied to simulate an idealised channel with the applications of a variety of weir geometries at various locations. The model has been set to simulate a U-shaped main channel with two identical U-shaped bifurcated channels. Simulations have been undertaken for the weirs with cross-sectional shapes of rectangular, Cipolletti (trapezoidal), and V-notch (triangular). Comparisons of velocity profiles and water elevations with different Froude numbers have been undertaken. The results present the relationships of the outlet discharge ratio and velocity ratio to weir height, crest length, and crest angle ratio with different cross-sectional shapes and locations of weir. The findings show that flood risks could be potentially reduced by understanding the flow behaviours of channel bifurcation with presence of weirs as controlled structure. Research Laboratory in Subterranean and Surface Hydraulics, University of Biskra 2022 Article PeerReviewed Ng, Kai Jia and Tan, Cha Yao and Selvarajoo, Anurita and Mohd. Haniffah, Mohd. Ridza and Kasiman, Erwan Hafizi and Lai, Sai Hin and Yuan, Dekui and Teo, Fang Yenn (2022) Simulating channel bifurcation flows with weirs for flood risk reduction. Larhyss Journal, 2022 (49). pp. 181-196. ISSN 1112-3680 http://larhyss.net/ojs/index.php/larhyss/article/view/820 NA
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Ng, Kai Jia
Tan, Cha Yao
Selvarajoo, Anurita
Mohd. Haniffah, Mohd. Ridza
Kasiman, Erwan Hafizi
Lai, Sai Hin
Yuan, Dekui
Teo, Fang Yenn
Simulating channel bifurcation flows with weirs for flood risk reduction
description Weir is widely used for controlling the flow discharges and water levels of a bifurcated river for flood risk reduction. The effects of weir on the bifurcation flow properties and hydrodynamic processes were not systematically studied by previous research, some of these have limitations and only showed that the discharge ratios were varied by the changes of weir height. Thus, there is a need to further explore on the effect of overall weir geometry and weir location on flow properties. In this study, an one-dimensional (1D) numerical model of Hydrological Engineering Centre-River Analysis System (HEC-RAS) has been applied to simulate an idealised channel with the applications of a variety of weir geometries at various locations. The model has been set to simulate a U-shaped main channel with two identical U-shaped bifurcated channels. Simulations have been undertaken for the weirs with cross-sectional shapes of rectangular, Cipolletti (trapezoidal), and V-notch (triangular). Comparisons of velocity profiles and water elevations with different Froude numbers have been undertaken. The results present the relationships of the outlet discharge ratio and velocity ratio to weir height, crest length, and crest angle ratio with different cross-sectional shapes and locations of weir. The findings show that flood risks could be potentially reduced by understanding the flow behaviours of channel bifurcation with presence of weirs as controlled structure.
format Article
author Ng, Kai Jia
Tan, Cha Yao
Selvarajoo, Anurita
Mohd. Haniffah, Mohd. Ridza
Kasiman, Erwan Hafizi
Lai, Sai Hin
Yuan, Dekui
Teo, Fang Yenn
author_facet Ng, Kai Jia
Tan, Cha Yao
Selvarajoo, Anurita
Mohd. Haniffah, Mohd. Ridza
Kasiman, Erwan Hafizi
Lai, Sai Hin
Yuan, Dekui
Teo, Fang Yenn
author_sort Ng, Kai Jia
title Simulating channel bifurcation flows with weirs for flood risk reduction
title_short Simulating channel bifurcation flows with weirs for flood risk reduction
title_full Simulating channel bifurcation flows with weirs for flood risk reduction
title_fullStr Simulating channel bifurcation flows with weirs for flood risk reduction
title_full_unstemmed Simulating channel bifurcation flows with weirs for flood risk reduction
title_sort simulating channel bifurcation flows with weirs for flood risk reduction
publisher Research Laboratory in Subterranean and Surface Hydraulics, University of Biskra
publishDate 2022
url http://eprints.utm.my/id/eprint/102756/
http://larhyss.net/ojs/index.php/larhyss/article/view/820
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