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Open AccessArticle

Effect of Mean Velocity-to-Critical Velocity Ratios on Bed Topography and Incipient Motion in a Meandering Channel: Experimental Investigation

1
Department of Water Engineering, Science and Research Branch, Islamic Azad University, Tehran 1477893855, Iran
2
Faculty of Water Sciences Engineering, Shahid Chamran University of Ahwaz, Ahwaz 6135783151, Iran
3
Department of Civil Engineering, Persian Gulf University, Bushehr 7516913817, Iran
*
Author to whom correspondence should be addressed.
Academic Editor: Alistair Borthwick
Water 2021, 13(7), 883; https://doi.org/10.3390/w13070883
Received: 5 February 2021 / Revised: 18 March 2021 / Accepted: 19 March 2021 / Published: 24 March 2021
(This article belongs to the Section Water Erosion and Sediment Transport)
As 180-degree meanders are observed in abundance in nature, a meandering channel with two consecutive 180-degree bends was designed and constructed to investigate bed topography variations. These two 180-degree mild bends are located between two upstream and downstream straight paths. In this study, different mean velocity-to-critical velocity ratios have been tested at the upstream straight path to determine the meander’s incipient motion. To this end, bed topography variations along the meander and the downstream straight path were addressed for different mean velocity-to-critical velocity ratios. In addition, the upstream bend’s effect on the downstream bend was investigated. Results indicated that the maximum scour depth at the downstream bend increased as a result of changing the mean velocity-to-critical velocity ratio from 0.8 to 0.84, 0.86, 0.89, 0.92, 0.95, and 0.98 by, respectively, 1.5, 2.5, 5, 10, 12, and 26 times. Moreover, increasing the ratio increased the maximum sedimentary height by 3, 10, 23, 48, 49, and 56 times. The upstream bend’s incipient motion was observed for the mean velocity-to-critical velocity ratio of 0.89, while the downstream bend’s incipient motion occurred for the ratio of 0.78. View Full-Text
Keywords: 180-degree bend; sediment transport; clear water; meandering channel; scour 180-degree bend; sediment transport; clear water; meandering channel; scour
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MDPI and ACS Style

Moghaddassi, N.; Musavi-Jahromi, S.H.; Vaghefi, M.; Khosrojerdi, A. Effect of Mean Velocity-to-Critical Velocity Ratios on Bed Topography and Incipient Motion in a Meandering Channel: Experimental Investigation. Water 2021, 13, 883. https://doi.org/10.3390/w13070883

AMA Style

Moghaddassi N, Musavi-Jahromi SH, Vaghefi M, Khosrojerdi A. Effect of Mean Velocity-to-Critical Velocity Ratios on Bed Topography and Incipient Motion in a Meandering Channel: Experimental Investigation. Water. 2021; 13(7):883. https://doi.org/10.3390/w13070883

Chicago/Turabian Style

Moghaddassi, Nargess; Musavi-Jahromi, Seyed H.; Vaghefi, Mohammad; Khosrojerdi, Amir. 2021. "Effect of Mean Velocity-to-Critical Velocity Ratios on Bed Topography and Incipient Motion in a Meandering Channel: Experimental Investigation" Water 13, no. 7: 883. https://doi.org/10.3390/w13070883

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