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《Resources and Environment in the Yangtze Basin》 2008-03
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METHOD TO DIVIDE FLOOD SEASON BASED ON THE FUZZY SET ANALYSIS AND ITS APPLICATION

FENG Ping~1 XU Xiang-guang~(1,2) LI Hai~1 (1.School of Civil Engineering,Tianjin University,Tianjin 300072,China;2.Commission of Haihe River Basin,Tianjin 300170,China)  
Based on theory and general application method of fuzzy set analysis,fuzziness,randomness, processiveness of hydrology phenomenon and responding character of rainfall and runoff in flood seasons were considered in order to establish a serious of new accumulative rainfalls according to positive accumulative rainfall series and negative accumulative rainfall series.The series was used in stage division of flood season.This paper proposed the concept of highest thresholds of in and out flood season (ASMAX)to eliminate the impact of different thresholds.The concept and method were applied to clarify the stage of flood season in Yuqiao Reservoir watershed.It is identified that the flood season of this watershed should be between June 11 and September 18 and main flood period between July 21 and August 4.This conclusion is in accordance with statistic regulation of"July bottom and August top",which means that the main flood season of Haihe watershed is between the last ten days of September and the first ten days of August.Accumulative rainfall series uncover processing character of flood season to certain extent, so it is suitable in stage division of flood season.
【Fund】: 国家自然科学基金(50579049);; 高等学校博士学科点专项科研基金(20040056060)
【CateGory Index】: TV87
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