正负坡上均匀散粒体泥沙起动流速的研究  

Incipient motion velocity of non-cohesive uniform sediment particles on the positive and negative slopes

作　　者：李林林[1] 张根广[1] 吴彰松[1] 高远[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《泥沙研究》2016年第5期54-59,共6页Journal of Sediment Research

基　　金：国家自然科学基金项目(51279170)

摘　　要：基于泥沙颗粒间相对暴露度及起动概率对泥沙起动的影响,引入附加质量力,采用泥沙滑动起动模型,推导出适用于正负坡条件下不同起动概率的泥沙起动底流速公式和垂线平均流速公式。在此基础上,引入泥沙颗粒形状修正系数。经实测资料验证,修正后的泥沙起动流速公式计算结果与实测资料吻合良好,不仅适用于均匀泥沙起动,还可以适用于非均匀泥沙起动。与已有的起动流速公式相比,本文公式形式简单,计算精度较高,可以应用于天然河流条件下非均匀泥沙起动流速计算。Based on sediment relative exposure degree on river bed and sediment threshold probability,the additional mass force was introduced into the sliding model for non-cohesive sediment particles to start motion,and the formula of incipient motion velocity applied to non-cohesive sediment particles on the positive and negative slopes was deduced. On the basis of this result,the correction coefficient influenced by sediment shape was introduced into the formula. The test by other measured data show that the incipient motion velocity calculated by the revised formula was in good agreement with the measured data. Compared with the existing equation,the formula in this paper has high calculation accuracy,and can be used to calculate incipient motion velocity both on the positive and negative slopes.

关 键 词：正负坡 附加质量力 相对暴露度 起动流速 

分 类 号：TV142.1[水利工程—水力学及河流动力学]