Abstract
The goal of levee breaches is not only to establish hydraulic connection to the farm lands, but to provide a means of sediment accrual. However, litt le attention has been direct ted to the design and placement of such breaches from the perspective of sediment accrual. A two dimensional flow model in which fluid and suspended particles are tracked using statistical concepts was developed to design levee breaches on the lower Mokelumne River. The model was verified using the time concentration curves observed in the laboratory channels. The model has been run for a hypothetical sinuous channel, in which the radius of curvature and the breach width were varied. Various flow velocities and breach/channel area ratios were also tested. The results show that total concentration passing through a levee breach increases as the stream velocity increases, and decreases as the radius of curvature of channel increases. While larger breaches will allow more sediment to pass, a breach width of three times the channel width was the point at which increases became negligible. The proposed model was also applied to design levee breach es on the lower Mokelumne River, in which breach placem ent and breach widths were varied. The results on the lower Mokelumne River show that the largest total concentration passing through a levee breach is presented in the levee breach placed in 155.6meters downstream of the injection site in which breach width is three times of the channel width.
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Cheong, T.S. Design of levee breaches for maximizing the trapping of suspended sediment. KSCE J Civ Eng 11, 175–183 (2007). https://doi.org/10.1007/BF02823898
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DOI: https://doi.org/10.1007/BF02823898