【摘要】 本文基于野外天然降雨定位试验观测资料,对降雨特征值的组合因子与水土流失量之间进行了多元统计相关分析。结果表明:降雨动能与最大30min雨强的组合因子EI₃₀与侵蚀量的关系最为密切;以降雨总量与最大30min雨强的乘积PI₃₀取代EI₃₀,经过检验,指标的精度能满足计算侵蚀量的需要,此指标可在黄土高原地区推广应用;建立了反映降雨径流影响侵蚀的综合数学模型;并指出,径流势能对侵蚀量具有极其重要的影响作用。更多还原

【Abstract】 On the base of data obtained from field experiment plots under natu- ral rain, the relationship between composite factors of rainfall character- istics and soil erosion is studied with statistical analysis methods in this paper.First the soil erosion amount is closely realated to the combination of rainfall energy and maximum 30 minutes rainfall intenstity (EI₃₀, also the more simple index of multiplication of rainfall amount and the maximum 30 minutes rain fall intensity (PI₃₀ can meet the prediction accuracy need for erosion. After the mathematical model of soil erosion reflecting the comprehensive effects of both rainfall and run- off are established, the result also shows that runoff potential energy has a more important effect on soil erosion.更多还原