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Experimental Investigation of Asymmetric Border Ice Effect on Sediment Transport

Author(s): Mina Rouzegar; Shawn Clark

Linked Author(s): Shawn Clark

Keywords: Sediment transport; Bed load; Ice-covered channel; Asymmetric border ice

Abstract: The onset of winter brings with it the formation of border ice in cold regions. The presence of partial ice cover can affect the sediment transport rate and distribution. It is essential to understand the ice cover effect in cold climates where sub-freezing temperatures affect water bodies for a significant part of the year. The literature contains many studies on sediment transport in open channel flow, and several studies on sediment transport in completely ice-covered flow. There has been little research on sediment transport in partially ice-covered channels. In this study, laboratory experiments were conducted in a rectangular flume at the Hydraulics Research & Testing Facility at the University of Manitoba, Canada, to help to address this gap. A set of 7 experiments was designed to investigate the effect of asymmetric border ice on the total sediment transport rate and sediment transport distribution within a partially ice-covered rectangular channel. The results were also compared to symmetric partially ice-covered flow. Although the asymmetric border ice was found to impact the sediment transport distribution within the channel, the total cross-section-averaged sediment transport rate can be calculated by the conventional equations used for that in open channel flow, fully ice-covered flow, and symmetric partially ice-covered flow. This equation, suggested by Knack and Shen (2015), relates the dimensionless bed load transport rate to the flow strength.


Year: 2023

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