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Ice and Sediment Transport in Channels with In-Stream Channel Restoration Structures

Author(s): Ian M. Knack; Hung Tao Shen; Andrew M. Tuthill

Linked Author(s): Hung Tao Shen

Keywords: No Keywords

Abstract: How a river restoration structure will resist ice action or affect the local ice regime are poorly understood. This paper presents a numerical model study focusing on the performance of rock vanes and cross vanes under ice run conditions. The two-dimensional river ice dynamics model, DynaRICE, was extended to study the effect of ice runs on cross vane structures as well as the effect of these structures on ice transport, ice jamming, and sediment transport in the channel. Results for long, straight, trapezoidal channels with and without cross vanes, show increased sediment transport and ice jam potential for the with-structures case. The simulated bathymetry with the cross vanes in place showed the desired effects of upstream sedimentation, downstream scour and increased flow diversity. The results indicate that the layout and spacing of the cross vanes are important in terms of ice conveyance and ice jam formation in the project reach.


Year: 2010

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