为了建立斜坡上泥沙起动流速的统一公式,基于概率论与力学相结合的方法,考虑了细颗粒泥沙之间的黏结力及附加下压力对泥沙起动的影响,引入起动概率与附加质量力,采用滑动起动模型,从理论上推导了该统一公式,包括近底作用流速和垂线平均流速。通过实测资料验证,该公式的计算结果与实测数据符合较好。与其他公式相比,该公式形式简单,计算精度较高,可以用来计算斜坡及平坡条件下黏性、非黏性泥沙的临界起动流速。
Abstract
In line with probability and mechanics theory, a unified formula for the incipient velocity of sediment on slopes (including near bed velocity and average velocity along vertical direction) is deducted by introducing incipient probability and additional mass force in incipient sliding model. The influence of adhesive force and additional downward force among fine sediment particles are taken into consideration. Tested results reveal that calculated data from the formula are well consistent with observed data. The formula is of simple form and good calculation accuracy, hence can be used for the calculation of critical incipient velocity of adhesive and non-adhesive sediment particles on slopes with different dip angles.
关键词
黏性泥沙 /
起动概率 /
滑动模型 /
起动流速 /
统一公式
Key words
cohesive sediment /
incipient probability /
sliding model /
incipient velocity /
unified formula
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参考文献
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