RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2009, Vol. 18 >> Issue (1): 66-.

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SPATIALTEMPORAL DISTRIBUTION OF RAINFALL EROSIVITY INTHE STORAGE AREAS OF MANWAN HYDROPOWER STATION

HE Yunling   

  1. School of Resources Environment and Earth Science, Yunnan University, Kunming 650091,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-01-20

Abstract:

Rainfall erosivity is a fundamental factor for quantitative monitoring and assessment of soil erosion.Analysis of the spatialtemporal characteristics of R value in the storage areas of Manwan Hydropower Station may supply good advices to prevent soil erosion effectively in local region.The paper studied on rainfall erosivity (R value) and its spatialtemporal distributions in the storage areas of Manwan Hydropower Station,based on the continuous rainfall data from 1980 to 2000 at four weather stations.The results indicate that the highest R value in this region is 3 9727 MJ·mm/hm2·h,while the lowest is 1 9336 MJ·mm/hm2·h.In general,the seasonal distribution of precipitation is analogical with that of rainfall erosivity on concentration extent.The rainfall erosivity is mainly distributed in the period from May to October in all stations and the rainfall erosivity of continuous three months (June~August) accounts for over half of that in a year on average.Annual rainfall erosivity in all stations fluctuates periodically,and the annual change of rainfall erosivity shows the positive trends in most parts since 1980's.The rainfall erosivity tends to increase by 2835 MJ·mm/hm2·h from 1980 to 2000.There are a lot of differences between the annual changes of rainfall and rainfall erosivity.The spatial distributions of the annual rainfall show that R value is the highest in Fengqing,and it is the lowest in Nanjian.

Key words: Manwan Hydropower Station, storage areas, rainfall erosivity, spatialtemporal distribution

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