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以湄公河清盛水文站为例,采用Mann-Kendall统计检验方法和Pettitt突变检验方法分析了1960～2003年径流量的变化趋势和突变点,基于水文变化指标,采用变动范围法定量评价了清盛站水文情势的变化程度。结果表明,清盛站年均流量总体呈下降趋势,枯季平均流量呈上升趋势,汛期平均流量呈下降趋势;径流系列基本未发生突变;1992年前后出现显著变化的水文指标有河流枯季月均水量、年均最小流量与出现时间、低流量谷底数与平均持续时间及流量平均变化率与逆转次数;河流水文情势整体属中度变化。
Taking the Mekong Qingshishun Hydrological Station as an example, the trend and the change point of runoff in 1960-2003 were analyzed by Mann-Kendall statistical test and Pettitt mutation test. Based on the hydrological index, The degree of change in the situation. The results showed that the annual average flow rate of Qingsheng Station showed a decreasing trend, the average flow rate in dry season showed an upward trend, and the average flow rate in flood season showed a decreasing trend. The runoff series basically did not change suddenly. Before and after 1992, The average annual minimum flow rate and time, the number of low flow valley and the average duration and the average flow rate and the number of reversals;