【摘要】 用１８８２～１９９２年月平均流量资料研究长江宜昌站枯季（１～３月）平均流量的长期变化特征，发现本世纪２０年代初经历了一次由多水期进入少水期的变化，它与全球范围的气候突变同步．相关分析表明，１～３月平均流量与前期１２月平均流量相关最好，其次为１０月．１０月平均流量可作为前期流域蓄水量的标志．更多还原

【Abstract】 The long-term variation of dry season(January,February and March)mean streamflow at Yichang Sta-tion of Yangtze River is analysed by using monthly mean data from 1882 to 1992.It is found that there was achange from high water period to low water period in the early of 1920’s which synchronized with the abruptchange of climate on global scale, Correlation analysis indicates that the mean streamflow of JFM correlatesmost prominently with that of December in preceding year and secondly with that of October.The meanstreamflow of October is the sign of the amount of basion water storage in preceding stage.更多还原