| 弯道岸坡上粗细泥沙统一起动流速公式 |
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| 引用本文： | 李林林,张根广.弯道岸坡上粗细泥沙统一起动流速公式[J].水动力学研究与进展(A辑),2017(3):380-388. |
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| 作者姓名： | 李林林 张根广 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院,陕西杨凌,712100 |
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| 基金项目： | 国家自然科学基金项目(51279170)Supported by the National Nature Science Foundation of China (51279170) |
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| 摘 要： | 该文基于概率论与泥沙起动基本理论,考虑了起动概率、相对暴露度与细颗粒泥沙间黏结力和附加下压力对泥沙起动的影响,采用滑动起动模型,从理论上推导出了适用于弯道岸坡上粗、细泥沙颗粒起动的统一流速公式,完善了已有研究成果对泥沙起动概率考虑的不足。公式综合了弯道岸坡、顺直岸坡、正负坡及平坡等条件下粗细泥沙颗粒起动流速计算,可简化为各简单条件下泥沙起动流速公式。通过各简单条件下泥沙起动流速实测资料验证,该文公式与实测数据符合良好。
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| 关 键 词： | 起动概率 岸坡 暴露度 起动流速 |
The unified formula of sediment incipient motion velocity on curve riverbank slopes |
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| LI Lin-lin,ZHANG Gen-guang.The unified formula of sediment incipient motion velocity on curve riverbank slopes[J].Journal of Hydrodynamics,2017(3):380-388. |
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| Authors: | LI Lin-lin ZHANG Gen-guang |
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| Abstract: | Based on the method of probability theory and sediment movement mechanics,the author introduced the threshold probability and relative exposure degree,considered the influence of adhesive force and additional downforce caused by the pellicular water between cohesive sediment particles and water depth,and deduced the theoretical unified formula of sediment incipient motion velocity using the sliding model.It improved the shortage of existing research results that ignored threshold probability and exposure degree.The theoretical unified formula in this paper combines the incipient motion velocity calculation of coarse and fine sediment on the simple conditions of curve and straight riverbank slopes,positive and negative slopes,and also the horizontal,which can be simplified as the formula of sediment incipient motion velocity on each simple conditions.As the verification shows,the calculated values were well consistent with the measured data. |
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| Keywords: | threshold probability riverbank slops exposure degree incipient motion velocity |
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