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《Research of Soil and Water Conservation》 2015-03
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Characteristics of Rainfall in Chaohu Basin in the Last 56 Years and Their Influences on Droughts and Floods

WANG Shichen;CHENG Xianfu;YANG Weiwei;College of Territorial Resources and Tourism,Anhui Normal University;Anhui Key Laboratory of Natural Disaster Process and Prevention;  
Through the precipitation data from 56 meteorological stations in Chaohu Basin in the last 56 years from 1957 to 2012and based on the methods such as Mann-Kendall mutation test,wavelet transform and SPI index,the precipitation time series of Chaohu Basin was analyzed including precipitation trend analysis,mutation analysis,periodic analysis and droughts and floods index analysis.The results showed that annual precipitation in the 56 years in Chaohu Basin presented the significant increasing trend,and the linear increase rate was 28.09mm/10 a.Precipitation in spring and autumn slightly increased,precipitation in summer and winter had the decreasing trend.The annual precipitation had 4events of mutation in 1963,1969,1976 and 1978,respectively,and reached the significant level from 1990 to 1993.Annual precipitation presented 3~5,6~10,12~18and 22~28years periodic variations over the 56 years.According to the drought grade division of the Chaohu Basin precipitation of the standardized precipitation index,and the changes before and after the mutation analysis in the Chaohu Basin precipitation after disaster,waterlog occurs more frequently in Chaohu Basin,and the precipitation readily causes the floods.
【Fund】: 国家自然科学资助项目“流域尺度洪涝灾害风险评估方法研究——以巢湖流域为例”(41271516)
【CateGory Index】: P333
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