| FRACTIONAL TRANSPORT OF SEDIMENT MIXTURES |
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| 引用本文： | Albert MOLINAS. FRACTIONAL TRANSPORT OF SEDIMENT MIXTURES[J]. 国际泥沙研究, 2003, 18(3) |
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| 作者姓名： | Albert MOLINAS |
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| 作者单位： | Dept. of |
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| 基金项目： | China. Financial supports by the Federal Highway Administration of USA through Grant No，国家自然科学基金 |
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| 摘 要： | 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 Ackers 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 signifi
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FRACTIONAL TRANSPORT OF SEDIMENT MIXTURES |
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| Baosheng WU,Albert MOLINAS,Anping SHU. FRACTIONAL TRANSPORT OF SEDIMENT MIXTURES[J]. International Journal of Sediment Research, 2003, 18(3) |
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| Authors: | Baosheng WU Albert MOLINAS Anping SHU |
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| Abstract: | 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 Ackers 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. |
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| Keywords: | Sediment transport Fractional transport Sediment mixtures Size distribution |
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