A new method based on the Transport Capacity Fraction (TCF) concept is proposed to compute the fractional transport rates for nonuniform sediment mixtures in sand-bed channels. The TCF concept is derived from the understanding that the measurements and predictions of bed-material load are more accurate and reliable than the measurements and predictions of fractional loads. First the bed-material load is computed using an appropriate equation, then the fractional transport rates are determined by distributing the bed-material load into size groups through a transport capacity distribution function. For the computation of bed-material loads, the Aekers and White, Engelund and Hansen, and Yang equations are used in this study. Two new transport capacity distribution functions are developed for flows in sand-bed channels. The new expressions presented in this paper account for the sheltering and exposure effects that exist in mixtures. Comparisons with measured data show that the proposed method can significantly improve the predictions of fractional transport rates for nonuniform sediment mixtures.
Sediment transportFractional transportSediment mixturesSize distribution
Baosheng WU、Albert MOLINAS、Anping SHU
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Associate Prof., Dept. of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
Associate Prof., Dept. of Civil Engineering, Colorado State University, Fort Collins, Colorado 80523, USA
Senior Engineer, Dept. of Sediment Research, China Institute of Water Resources and Hydropower Research, Beijing 100044, China
conducted at Hydrau-Tech Inc. in Fort Collins, Colorado, USA, and completed at Tsinghua University in Beijing, China. Financial国家自然科学基金
NETL
NSTL
维普
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