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    Research on Variation and Cause of the Multi-time-scale Extreme Runoff Series in the Mainstream of Xiuhe River Basin by ZHOU Qiuhong, LIU Cheng, WU Shaofei

    Published 2020-01-01
    “…Nowadays,with the influence of climate change and human activities,many hydrological elements,including extreme runoff,usually suffer from strong inconsistency.Taking the daily runoff series of Qiujin Station on the mainstream of Xiuhe River as an example,this paper discusses the variation of multi-time-scale extreme runoff series,that is,continuous maximum 1 day series Max1d,continuous maximum 3 day series Max3d,continuous maximum 7 day series Max7d,continuous maximum 15 day series Max15d and continuous maximum 1 month series Max1m in Qiujin Hydrological Station from 1956 to 2014 through hydrological variation diagnosis system,and analyses the reasons for the variation of multi-time-scale runoff series from the perspectives of precipitation, temperature and water conservancy project construction in the basin.The results indicate that:①The above multi-time-scale runoff series all suffered downward jumping variation in 1981,1983,1983,1977 and 1977,respectively;②Zhelin reservoir has a significant effect on the variation of multi-time-scale extreme runoff series of Qiujin station;③The precipitation in May were the main meteorological factor affecting the variation of the multi-time-scale extreme runoff in Qiujin station,while the monthly average temperature also has a significant impact on the short-term runoff series of Max1d and Max3d.This research can provide scientific basis for the prevention and treatment of flood and drought disasters and the restoration of water ecosystem in the mainstream of Xiuhe River Basin.…”
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