Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 5 February 2021 / Approved: 8 February 2021 / Online: 8 February 2021 (12:12:09 CET)

How to cite: 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. Preprints 2021, 2021020198 (doi: 10.20944/preprints202102.0198.v1). 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. Preprints 2021, 2021020198 (doi: 10.20944/preprints202102.0198.v1).

Abstract

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 has been investigated. Results indicated that the maximum scour depth at the downstream bend has 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 was equal to 0.78.

Subject Areas

180-degree bend; Sediment transport; Clear water; Open-channels; Scour

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