水土保持通报英文版
1000-288X
2012
6
34
37
article
黄土坡面细沟水流阻力的试验研究
Experimental Study of Rill Flow Resistance on Loess Hillslope
水流阻力是重要的水力学参数之一,阐明细沟水流阻力系数变化特征对于认识细沟水流水力学性质及细沟侵蚀动力学过程机理具有重要意义。采用具有定流量人工放水的组合小区模拟降雨试验方法,对黄土坡面细沟侵蚀过程中的水流阻力进行了试验研究。结果表明:(1)细沟水流阻力系数随径流历时的变化,在不同雨强条件下不断增加,增大趋势总体一致,产流15min后增速出现差异,可用指数方程很好地描述。(2)细沟水流阻力系数随径流历时的变化,在不同坡度条件下也不断增大,变化过程总体一致,产流15min后增速也出现差异,可用指数方程很好地描述,不同坡度下阻力系数差异较不同雨强下稍大。(3)细沟水流平均阻力系数随雨强增大而减小,可用对数方程进行描述;随坡度增大而增大,但增幅很小,可用指数方程描述;随雨强与坡度的变化可用二元指数方程描述。
Water flow resistance is one of the important hydraulic parameters.Elucidating the variations of rill flow resistance coefficient is critical to understand the hydraulic properties of rill flow and the mechanisms of dynamic rill erosion process.The flow resistance involved in rill erosion processes on loess hillslope was studied by a multi-plot experiment under simulated rainfall with addition of steady in-flow through the tops of the plots.The results showed that rill flow resistance coefficients for different rainfall intensities showed a consistently increasing tendency increase with runoff duration.Fifteen minutes after the initiation of runoff,the increasing trend changed and could be well described by an exponential equation.The resistance coefficients for different slopes exhibited the exactly same trend.The average resistance coefficient of rill flow decreased with increasing rainfall intensity,which can be described by a logarithmic equation,while it increased slightly with increasing slope steepness,which can be described by an exponential equation.A dual exponential equation can be used to describe the variations of the average resistance coefficient with various rainfall intensity and slope steepness.
黄土坡面;细沟水流;水流阻力;阻力系数
loess hillslope;rill flow;flow resistance;resistance coefficient
申楠,王占礼,刘俊娥,谭贞学,王莎,焦念
SHEN Nan,WANG Zhan-li,LIU Jun-e,TAN Zhen-xue,WANG Sha and JIAO Nian
stbctb/article/abstract/20120608