阿克苏河源流区径流量与降水量丰枯变化和相关性研究/Research on the High-Low Flow Variation and the Correlation Between Runoff and Precipitation at the Headwaters of the Aksu River[J]

利用新疆塔里木河流域阿克苏河源流区出山口沙里桂兰克和协合拉两水文站1957-2008年近50 a的径流和降水数据,借助Z指数法、参数T检验和非参数检验和小波变换等,分析了阿克苏河两水文站降水量和径流量的变化趋势,以及二者多时间尺度相关关系.结果表明:近50 a来,沙里桂兰克、协合拉径流量和降水量均呈增加趋势,两水文站径流量在1993年发生了显著的增多突变,其中,降水量突变点沙里桂兰克在1985年,协合拉在1986年.沙里桂兰克和协合拉降水量和径流量丰枯指数由突变前的“偏枯”和“正常”等级为主转变为突变后的“正常”和“偏涝”等级占优势.沙里桂兰克和协合拉径流量变化分别存在7 a和6 a的主周期,降水量变化分别存在7 a和4 a的主周期.沙里桂兰克径流量和降水量在整个时间尺度上以正相关为主,协合拉则以负相关为主,在大于20 a的时间尺度上两水文站径流量和降水量均呈不显著的正相关关系

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^