Analysis of Runoff Change Characteristics at Datong Station of Yangtze River
Analysis of Runoff Change Characteristics at Datong Station of Yangtze River
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发表时间：
2011
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通讯作者：
Deng Jin-yun
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作者：
Deng Jin-yun
采用非参数Mann- kendall检验、Pettitt Mann Whitney变点统计、Morlet小波变换和年分布定量方法，研究了1946—2009年长江大同站径流的变化趋势、变化点、周期和年分布。发现大同站年、季径流序列变化趋势不大，月径流序列变化趋势明显；年序列无变化点，而季节和月径流序列有显著的变化点。径流序列也有10年以上和10年以内的周期；径流序列的年分布在20世纪60年代、70年代和90年代较为集中，2000年代较为均匀；年径流量主要集中在7、8月；径流年变化幅度在60年代较大，在2000年代较小。分析了流域径流变化的原因，为流域水资源的开发利用提供了科学依据。
Trend,change point,period and annual distribution of runoff at Datong Station in Yangtze River from 1946 to 2009 are investigated by using the nonparametric Mann-Kendall test,Pettitt Mann Whitney change point statistics,Morlet wavelet transform and annual distribution quantitative methods.It is found that the annual and seasonal runoff series at Datong Station have little trends but the monthly runoff series have obvious variation trends;the annual series has no change point while the seasonal and monthly runoff series have significant change points.the runoff series also have periods of over and within 10 years;furthermore,annual distribution of runoff series is more concentrated in 1960s,1970s and 1990s while evener in 2000s;the annual runoff mainly concentrates in July and August;the annual variation range of runoff is larger in 1960s but smaller in 2000s.Besides,the reasons of runoff change are also analyzed,which provides scientific basis for water resources development and utilization in basin.