| 卵砾石边坡坡脚泥沙起动试验研究 |
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| 引用本文： | 杨胜发,王涵,周华君.卵砾石边坡坡脚泥沙起动试验研究[J].重庆交通大学学报(自然科学版),2009,28(2):241-245. |
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| 作者姓名： | 杨胜发 王涵 周华君 |
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| 作者单位： | 重庆交通大学,河海学院,重庆,400074 |
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 针对山区河流枯水卵石急滩的泥沙输移特点,通过对斜坡上卵砾石的实验现象观察和理论分析,发现卵砾石边坡坡脚处的泥沙首先起动。根据卵砾石边坡坡脚泥沙的受力状态,采用滚动模式进行理论推导,考虑了底部流速、阻力系数、卵砾石水下重力及其附加重力的影响,推导出了卵砾石边坡坡脚泥沙的起动流速公式,该公式与边坡坡度有关。通过水槽试验,拟合出卵砾石边坡坡脚泥沙的起动公式,并与沙莫夫公式进行了比较。
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| 关 键 词： | 卵砾石 边坡 附加重力 起动流速 |
Experimental Study on Incipient Motion of Gravel Sediments at the Foot of Slopes |
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| YANG Sheng-fa,WANG Han,ZHOU Hua-jun.Experimental Study on Incipient Motion of Gravel Sediments at the Foot of Slopes[J].Journal of Chongqing Jiaotong University,2009,28(2):241-245. |
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| Authors: | YANG Sheng-fa WANG Han ZHOU Hua-jun |
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| Institution: | School of River & Ocean Engineering;Chongqing Jiaotong University;Chongqing 400074;China |
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| Abstract: | Aiming at the transporting characteristics of gravel sediment in low water and urgent shoal in mountainous rivers,it is found that incipient motion first starts at the foot of the slopes through the experiment observertions of the gravel on the slopes and theoretical analysis of the phenomenon.According to the gravel sediments stress state at the foot of the slopes,a rolling model is adopted to conduct a theoretic deduction;and the bottom velocity,drag coefficient,gravel underwater gravity and the impact of... |
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| Keywords: | gravel sediment slope additional gravity incipient motion flow |
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