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Changes of Precipitation Characters Along Weihe Basin in 50 Years and Its Influence on Water Resources

LIU Yan,HU An-yan(Collegeof Environment Scienceand Engineering,Chang`an University,Xi`an 710054,China)  
Based on the long hydrological observation records,the precipitation characters ranged from months to decades and its variations′regularities were discussed by taking example of Weihe River—the largest tributary of Yellow River.According to the analysison the changes of water resources,the motivation of changes was analyzed,and it was pointed out that: The decrease of precipitation and the influence of human activities are the most direct and important reasons for the decrease of water resources in Weihe Basin.
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