丹江流域典型地区降雨侵蚀力的研究

以长江上游丹江流域典型地区陕西省商南县为研究区,收集该地区2010年13个水文雨量站降雨资料,以经典算法计算的降雨侵蚀力作为基准值,对比分析6个简易模型的计算精度,并优选适用性最佳模型估算各站的降雨侵蚀力,插值绘制成空间分布图进行空间分析。结果表明:卜氏模型计算精度最高,平均达到89.325%,在研究区具有较好适用性。商南县2010年降雨侵蚀力平均为254.46 MJ.(hm2.h.a)-1.mm。7月份降雨量与降雨侵蚀力均达到最高,分别占年总量的50.41%和89.56%,降雨侵蚀力呈高度集中的季节分布态势。降雨侵蚀力空间分布不均匀,具有较为明显的高值区,南、北部较低,东北部地区几个站均较高,形成一个小范围高值区。

Study on rainfall erosivity in typical region along Danjiang river catchment

In this paper,6 different models were used to estimate the rainfall erosivity based on the rainfall data of 13 precipitation stations in 2010 in Shangnan County which was a typical region along the Danjiang river catchment.By comparing the accuracy of 6 different models,the best performed model was selected for regional rainfall erosivity computation.The results showed that the Bu′s model had the highest accuracy,with an average of 89.325%,and this was an ideal result and could be implicated in Shangnan County.The average value of rainfall erosivity was 254.46 MJ·(hm2·h·a)-1·mm in 2010.The precipitation and rainfall erosivity reached a maximum value in July,and accounted for 50.41% and 89.56% in their separate annual totals,and rainfall erosivity was a high concentration of seasonal distribution trend.The space distribution of rainfall erosivity in Shangnan County was not homogeneous and formed a distinct high value area.The lower rainfall erosivity regions was in the south and the north,forming a high value area in the northeast.