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为揭示三峡水库运行后鄱阳湖水文情势的变化特征,选取月平均水位、极端水文条件、极端水文事件发生时间、脉冲频率及历时、水文条件变化情况作为水位指标,对比分析三峡水库运行前后水位指标的变化特征,采用t检验法判定水位指标变化是否显著,并通过比较水位指标变化的百分比绝对值分析变化剧烈的指标。结果表明,在三峡水库、降水变化等因素的综合影响下,鄱阳湖年平均水位及月平均水位、不同历时极端高水位与极端低水位均显著降低,10月落水率显著提高,枯期水位指标变化百分比绝对值总体上较大,鄱阳湖枯期水文情势变化较为显著。
In order to reveal the changing features of Poyang Lake hydrological conditions after the Three Gorges Reservoir operation, the monthly average water level, extreme hydrological conditions, the occurrence time of extreme hydrological events, pulse frequency, duration and hydrological conditions were selected as the water level indicators. The water level indexes before and after the operation of the Three Gorges Reservoir T test was used to determine whether the change of water level index was significant or not, and the index of drastic change was analyzed by comparing absolute percentage change of water level index. The results show that under the combined effect of the Three Gorges Reservoir and precipitation changes, the average water level of Poyang Lake and the monthly mean water level, the extreme high water level and the extremely low water level of Poyang Lake decreased significantly, and the water cut rate of October increased significantly. The water level index The absolute percentage of change is relatively large, and the change of hydrological conditions in Poyang Lake is more significant.