利用日降雨量资料估算西南地区的降雨侵蚀力

降雨是影响土壤侵蚀的主要因素之一，降雨侵蚀力是各种土壤侵蚀预测预报模型的主要参数。降雨侵蚀力通常用降雨动能和某一时段最大降雨强度的乘积表示，如EI₃₀、EI₁₀或者EI₆₀等，但是这种计算方法需要长期且连续的自记雨量资料。我国大多数地区缺乏完整的自记雨量资料，使这些方法的应用受到了限制。一些不需要自记雨量过程的降雨侵蚀力计算方法已经提出，对考虑降雨季节变化的日降雨量估算降雨侵蚀力模型进行了修正，并用

Estimating R-factor in Southwest China with Data of Daily Rainfall Amount

The rainfall was a key factor to soil erosion, and the rainfall erosivity (R-factor) was a major parameter for predicting soil erosion model.Generally, R-factor was estimated through the product which rainfall kinetic energy times the rainfall density during the most 30 min precipitation, such as EI₃₀, EI₁₀ or EI₆₀ with long term and continuous pluviograph data.In China, the most regions lack of these data, thus, this led to difficult to estimate R-factor extensively.The parameters of model that estimating R-factor with data of daily rainfall amount by Yu and Rosewell were determined according the actual condition of Southwestern China.The R-factors were estimated in Nanning, Guiyang, Kunming, Chongqing and Chengdu, which were identical with EI₁₀ or EI₃₀.The method avoided the complex calculation for most rainfall density during one period of time in R-factor estimated by usual method, and with high veracity.At the same time, the model can describe the spatial and seasonal distribution of rainfall of erosivity.So, the method can be used widely in Southwestern China.