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首页> 外文会议>2010 International conference of international conference on combating land degradation in agricultral areas. >Runoff and Sediment Yield on Very Steep Slopes under Simulated Rainfall
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Runoff and Sediment Yield on Very Steep Slopes under Simulated Rainfall

机译：模拟降雨条件下 r陡坡的径流产沙量

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Soil erosion is one of the most important r factors that lead to soil degradation. Many studies have r been conducted the effects of slope steepness on soil erosion. r Some of these studies showed that there is a unique slope r named critical slope of erosion, at which maximum soil loss r occurred. When slope steepness was different than that unique r slope, soil loss was less. Most of these relationships were r developed using data collected on slope up to approximately 35°. r In this study, soil loss data within slope ranged from 25° to 45r ° were used to access the effect of very steep slope on soil r erosion. The results indicated that the volume of runoff and flow r velocity decreased with increasing slope gradient. Along with r runoff and flow velocity decreasing, flow Reynolds number and r Froude number decreased from about 19 to 13 and from r 0.00055 to 0.00009, respectively, while Darcy-Weisbach r friction coefficient increased from 3.27 to 4.29. There r were two critical slopes of soil erosion within the given slope r scope. The first critical slope emerged between 25～35°, at r which maximum soil loss occurred; the second critical slope r emerged between 30～40°, at which minimum soil loss occurred. r The probable reasons for that were that the main form of r rainfall erosion changed from runoff erosion to splash erosion r with increasing slope gradient due to the changing hydraulic r characteristics.
机译：土壤侵蚀是导致土壤退化的最重要因素之一。已经进行了许多研究，坡度对土壤侵蚀的影响。 r其中一些研究表明，存在一个唯一的坡度r，称为侵蚀临界坡度，在该坡度处发生最大的土壤流失r。当坡度不同于唯一的r坡度时，土壤流失较少。这些关系中的大多数是使用在大约35°的斜坡上收集的数据开发的。在这项研究中，使用坡度在25°到45r°之间的土壤流失数据来获取非常陡峭的坡度对土壤侵蚀的影响。结果表明，径流量和流速随坡度的增加而减小。随着r径流和流速的降低，雷诺数和r Froude数分别从约19减小到13和r 0.00055减小到0.00009，而Darcy-Weisbach r摩擦系数从3.27增大到4.29。在给定的坡度范围内，有两个土壤侵蚀的临界坡度。第一个临界坡度出现在25〜35°之间，在r处土壤流失最大。第二临界斜率r出现在30〜40°之间，此时土壤流失最小。 r可能的原因是，由于水力特性的变化，降雨侵蚀的主要形式从径流侵蚀变为飞溅侵蚀，随着坡度梯度的增加而增大。

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