Spatiotemporal Distribution of Rainfall Erosivity for Water Erosion District in Upper Reaches of Yangtze River

WANG Ai-juan; LI Zhi-guang; LIU Feng

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Spatiotemporal Distribution of Rainfall Erosivity for Water Erosion District in Upper Reaches of Yangtze River

- Spatiotemporal Distribution of Rainfall Erosivity for Water Erosion District in Upper Reaches of Yangtze River
- Bulletin of Soiland Water Conservation Vol. 32, Issue 1, Pages: 8-11(2013)
- 作者机构：
  
  1. 长江科学院水土保持研究所,湖北,武汉,430010
  2. 水利部水土保持监测中心,北京,100055
  3. 北京师范大学地理与遥感科学学院,北京,100875
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
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WANG Ai-juan, LI Zhi-guang, LIU Feng. Spatiotemporal Distribution of Rainfall Erosivity for Water Erosion District in Upper Reaches of Yangtze River[J]. Bulletin of Soiland Water Conservation, 2013, 32(1): 8-11.
DOI：

WANG Ai-juan, LI Zhi-guang, LIU Feng. Spatiotemporal Distribution of Rainfall Erosivity for Water Erosion District in Upper Reaches of Yangtze River[J]. Bulletin of Soiland Water Conservation, 2013, 32(1): 8-11. DOI：

摘要

降雨侵蚀力的时空分布特征对于分析和认识土壤侵蚀规律十分重要。根据长江上游7个省市的704个站点1981—2010年30a的逐日降雨量资料计算了多年平均降雨侵蚀力R值

多年平均半月降雨侵蚀力及其占年降雨侵蚀力的比例

并分析了长江上游水蚀区降雨侵蚀力的空间分布规律。结果表明

长江上游水蚀区的降雨侵蚀力R值范围为273～11 394MJ.mm/(hm

·h·a);受地形的影响R值的空间分布有3个高值区

位于四川省峨眉山市、贵州省毕节地区和湖北省宜昌市附近;建立了多年平均降雨量和降雨侵蚀力R值的关系

相关系数R2达到0.80;研究区降雨侵蚀力的年内分布集中度较大

均值为69%

主要集中在5—10月。

Abstract

Spatiotemporal characteristics of rainfall erosivity are very important for the understandings of soilerosion processes.Daily rainfall data from 704weather stations of seven provinces in the upper reaches of theYangtze River in past 30years(1980-2010)were used to calculate the average annual rainfall erosivity

average annual half-month rainfall erosivity and the proportion of the annual rainfall erosivity

so as to determine the spatiotemporal distribution of erosive rainfall.Results showed that the highest Rvalue was found tobe 11 394MJ·mm/(hm2·h·a)and the lowest

273MJ·mm/(hm2·h·a).As influenced by terrain

rainfall erosivity presented three high value areas of the Emei Mountains in Sichuan Province

Bijie region inGuizhou Province and Yichang City in Hubei Province.There was a significant correlation between rainfallerosivity and average annual rainfall

with a correlation coefficient R2 of 0.80.In the study area

the seasonaldistribution of rainfall erosivity had a concentration percentage of 69% and was mainly concentrated fromMay to October.

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