三峡水库运行调度对鄱阳湖湖口水文情势影响分析
Hydrological Effect of Three Gorge Reservoir Operation on Hukou Station at Poyang Lake

2009年三峡水库已经转入全面运行期。本文通过对1950年以来湖口站水位流量资料进行分析结果表明：近60年来湖口站年平均水位和平均流量虽然总体上略有下降，但是变化幅度不大且具有较明显的周期性。2003年以后变化幅度较大，尤其是2006年之后下降趋势十分显著。为进一步分析三峡水库运行调度对鄱阳湖湖口水文情势产生的影响程度，根据三峡水库运行调度情况对湖口水位流量在不同运行期进行了分析。结果显示水库蓄水期由于减少了长江干流流量，长江干流水位较天然情况下降低，湖口出流加快；在枯水期使得湖口站的枯水期提前，枯水期持续时间增长；洪水期和泄水期对鄱阳湖湖口影响不大。

Abstract: The Three Gorges Reservoir had shifted into comprehensive operation stage since 2009. This paper analyzed daily water level and discharge data of Hukou station from 1950 to 2009. The results show that the average annual discharge and water level of Hukou station decrease slightly in the past 60 years and the changes show obvious pattern of periodicity. From 2003, especially after 2006, the average annual discharge and water level have declined significantly. According to the operation rules of Three Gorges Reservoir, this paper analyzed the hydrological impacts of Three Gorges Reservoir on Hukou hydrological regime in different operation periods. It is found that the decline of discharge and water level of Yangtze River caused by the water storing of Three Gorges reservoir leads to the dry season ofPoyangLakeappearing earlier and lasting longer. However, the influence on Hukou hydrological regime is not obvious at flooding and releasing periods.

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