Variation trends of runoffs seasonal distribution of the six larger basins in China over the past 50 years
Variation trends of runoffs seasonal distribution of the six larger basins in China over the past 50 years
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发表时间：
2008
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通讯作者：
Zhang Si-long
中科院分区：
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作者：
Zhang Si-long
根据中国流域19个主要水文站1950年以来的月径流观测资料，分析了流域内各水文站的季节分布不均匀系数、汇流速率、汇流周期和变化幅度，并采用Mann-Kendall检验法进行了年内径流趋势检验。结果表明，自20世纪80年代以来，除石下里站、海河流域响水铺站和黄河花园口站外，6个大流域的月径流观测值基本发生了变化。其他站的年内分布不均匀系数和相对汇流系数均较大，特别是松辽流域。此外，松辽流域的年内分布不均匀系数和相对汇流系数也较大，尤其是松辽河流域南部冬春(12~3月)月径流增减，7月增加；北部冬春(1~5月)，海河流域、辽河铁岭站、黄河利津站、淮河流域吴家渡站减少明显。
Based on the observed monthly streamflow of 19 key hydrological control stations in the six larger basins in China since 1950,the uneven coefficient of seasonal distribution,concentration rate, concentration period and variation range are analyzed,and the Mann-Kendall test method is employed to detect trends of inner-annual runoff.Results indicate that since 1980s,the observed monthly streamflow in the six larger basins has generally changed,except of Shixiali station,Xiangshuipu station in Hai river basin and Huayuankou station in Yellow River basin.For other stations,the uneven coefficient of inner-annual distribution and relative concentration rate are larger,particularly in Songliao river basin.Moreover,the monthly runoff in winter and spring(from December to March) in southern basin increases and decreases in May and increases in July while in winter and spring(from January to May) in northern basin it decreases evidently in Hai river basin,Tieling station in Liao river basin,Lijin station in Yellow River basin and Wujiadu station in Huai river basin.