| 引用本文: | 赵 璐,孙菊英,张 璐,等.不同黑麦草种植密度对坡面流的阻力特性影响研究[J].灌溉排水学报,2017,36(2):. |
| ZHAO Lu,SUN Juying,ZHANG Lu,et al.不同黑麦草种植密度对坡面流的阻力特性影响研究[J].灌溉排水学报,2017,36(2):. |
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| 摘要: |
| 为探究植被覆盖下坡面流的阻力特性，采用理论分析与室内放水冲刷试验相结合的方法，分析了3种不同种植密度、2组坡度下黑麦草对坡面流阻力的影响，并初步探讨了一定条件下柔性植被的形态与坡面水流的相互作用。结果表明，当有植被覆盖时，糙率系数随雷诺数的增加基本呈先增加后减少再增加的趋势；糙率系数并非随密度增大而增大；坡度为5°时糙率系数与弗汝德数之间呈良好的幂函数关系，而坡度为10°时拟合度并不高；在弗汝德数相同时，糙率系数随着坡度的增加而减少。 |
| 关键词: 坡面流；植被密度；阻力特性；糙率系数 |
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| Study on Resistance Characteristics for Overland flow under Different Density of Flexible Vegetation Cover |
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ZHAO Lu, SUN Juying, ZHANG Lu, PAN Xueqian, LEI Xiaozhang
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State Key Laboratory of Hydraulics and Mountain River Engineer, Sichuan University, Chengdu 610065, China
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| Abstract: |
| Based on the method of integrating theoretical analysis with experiment, a series of overland flow experiments were carried out to study the influence of three different coverage and two slope groups of the perennial ryegrass on resistance characteristics of overland flow. The interaction between the form of flexible vegetation and flow was primarily discussed under certain conditions. The experiment results showed that Manning coefficient increased and then decreased and increased finally as the Reynolds number increased with surface coverage of vegetation; Manning coefficient did not increase as vegetation density increased; when the slop was 5o, Manning coefficient decreased with Froude number by good power function, but 10o did not. With the same Froude number, Manning coefficient decreased with the slope increases. |
| Key words: overland flow; the density of vegetation; resistance characteristics; Manning coefficient |
