水土保持通报2012，Vol.32Issue(5)：182-185,4.
嘉陵江流域降雨侵蚀力时空变化分析
Spatiotemporal Variability of Rainfall Erosivity in Jialing River Basin
摘要
Abstract
Rainfall erosivity shows the potential soil erosion induced by rainfall and is very important in predicting soil erosion quantitatively.With the daily rainfall data from 12 meteorological stations in Jialing River basin,rainfall erosivity in the basin was estimated and its spatiotemporal variability was analyzed by using the daily rainfall erosivity model.Results showed that the spatial characteristic of rainfall erosivity was consistent with the spatial distribution of rainfall,declining from southeast to northwest and varying from 800 to 9 000 MJ·mm/(hm2·h·a).The inter-annual variation was great and Cv was between 0.346 and 0.493.However,result from Mann—Kendall test showed there was no significant trend of variation except Pingwu station with a decreasing trend.Rainfall erosivity presented seasonal dynamics in the whole year.The seasonal distribution of rainfall erosivity was highly centralized and rainfall erosivity from June to September occupied 80% of the whole year.Rainfall erosivity had the periods of 21 and 35 years and different rainy-drier periods in the last 50 years.Through the study,there was no significant trend of variation in annual rainfall erosivity,but rainfall erosivity was relatively concentrated in the summer and autumn.Therefore,some measures should be taken to prevent soil erosion or other disasters in flood season.关键词
嘉陵江流域/日降雨量/降雨侵蚀力/时空变化Key words
Jialing River basin/daily rainfall/rainfall erosivity/spatiotemporal variation分类
农业科技引用本文复制引用
段文明,穆兴民,王飞,赵广举,高鹏..嘉陵江流域降雨侵蚀力时空变化分析[J].水土保持通报,2012,32(5):182-185,4.基金项目
中国科学院国际合作项目“渭河流域水环境问题综合治理对策研究” （）
