水土保持通报2016，Vol.36Issue(3)：1-7,7.
三峡库区大宁河流域降雨侵蚀力的时空变化
Temporal-spatial Variations of Rainfall Erosivity in Daning River Watershed of Three Gorges Reservoir Region
摘要
Abstract
[Objective] To analyze the spatio‐temporal variation of rainfall erosivity in order to provide the basis for predicting soil erosion and evaluating the effectiveness of conservation measures .[Methods] Based on the daily rainfall records (1970 — 2010) from 13 rain‐gauge stations located in Daning river watershed in the Three Gorges reservoir region ,the characteristics of annual and monthly rainfall erosivity were investigated . Meanwhile ,by using GIS 10 .2 software , spatio‐temporal variation of rainfall erosivity was analyzed . [Results] The annual rainfall erosivity (R‐factor) was ranged from 3 619 .55 ~ 11 109 .14 MJ ・ mm/(hm2 ・ h ・ a) , and the mean value was 7 245 .55 MJ ・ mm/( hm2 ・ h ・ a) . The spatial distribution of rainfall erosivity showed a decreasing trend from east and west to the central of the watershed ,while there was no significant change from south to north .The distribution of rainfall showed a similar trend .The maximum and minimum rainfall erosivity occurred in Jianlou and Wushan station ,respectively .The inner‐annual distribution of the rainfall erosivity showed two peaks and highly concentrated in the period from April to October , which accounted for 95 % of total annual rainfall erosivity .[Conclusion] The spatio‐temporal variation of rainfall erosivity is not only closely related to the distribution of rainfall amount ,but also related to the regional rain‐fall pattern and local topography .关键词
降雨侵蚀力/日雨量/三峡水库/大宁河流域Key words
rainfall erosivity/daily rainfall/the Three Gorges reservoir/Daning river watershed分类
农业科技引用本文复制引用
任洪玉,刘惠英..三峡库区大宁河流域降雨侵蚀力的时空变化[J].水土保持通报,2016,36(3):1-7,7.基金项目
水利部公益性行业科研专项经费项目“长江流域山洪灾害区域特征及防御体系研究”（201301059）；国家自然科学基金项目（51309129）；江西省土壤侵蚀与防治重点实验室开放基金 （）
