| 紫色土坡面细沟流的水动力学特征试验研究 |
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| 引用本文： | 任熠,王先拓,王玉宽,傅斌,王勇强.紫色土坡面细沟流的水动力学特征试验研究[J].水土保持学报,2007,21(6):39-42. |
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| 作者姓名： | 任熠 王先拓 王玉宽 傅斌 王勇强 |
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| 作者单位： | 1. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041;中国科学院研究生院,北京,100049
2. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041 |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 通过不同坡度、流量的组合放水冲刷试验,对紫色土坡面细沟侵蚀发生过程中的坡面细沟流水动力学特征进行了研究。结果表明,在试验的坡度和流量范围内,紫色土细沟流流速随放水量的增加而增大,而在相同放水量下紫色土坡面细沟流流速随坡度增加变化趋势不明显。紫色土细沟流的雷诺数变化于500~4 600之间,流态基本属于紊流,在同一坡度下,雷诺数随放水量的增大而迅速增大。紫色土细沟流弗汝德数在整个试验过程中均大于1,属于急流范畴。坡面流阻力系数的大小与水流雷诺数有关,但其变化趋势受坡度和流量的影响。在坡度较缓时阻力系数随雷诺数的增大而减小,在坡度较大时阻力系数随雷诺数的增大而增大,但起伏较大。
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| 关 键 词： | 紫色土 细沟流 水动力学特征 |
| 文章编号： | 1009-2242(2007)06-0039-04 |
| 修稿时间： | 2007年7月2日 |
Study on Hydrodynamic Characters of Rill Flow on Purple Soil Slope |
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| REN Yi,WANG Xian-tuo,WANG Yu-kuan,FU Bin,WANG Yong-qiang.Study on Hydrodynamic Characters of Rill Flow on Purple Soil Slope[J].Journal of Soil and Water Conservation,2007,21(6):39-42. |
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| Authors: | REN Yi WANG Xian-tuo WANG Yu-kuan FU Bin WANG Yong-qiang |
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| Abstract: | The hydrodynamic characters of rill flow in the process of rill erosion in purple soil were studied by using runoff simulated experiment under the different slope gradients and the different flow discharges.The results show that the velocity of rill flow on purple soil slope increased according with the increase of runoff,but with the same runoff flux,the velocity of rill flow has no obvious trend.The Reynolds number of rill flow varies between 500 and 4 600 in experiments and it increases quickly with the increase of flow flux on the same slope.The Froude number of rill flow is above 1 in experiments and it belongs to the supercritical flow.The roughness coefficient affected by the slope gradient and flow flux,is closely related to the Reynolds number.It decreases with the increase of Reynolds on gentle slopes,and increases with the increase of Reynolds on steep slope. |
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| Keywords: | purple soil rill flow hydrodynamic character |
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