三峡工程建库后对洞庭湖水位、泥沙和水质的影响分析

Impact of Three Gorges Reservoir on water level,sediment and water quality of Dongting Lake

长江与洞庭湖在地理和水文要素上联系紧密。三峡工程建成后,洞庭湖水位、含沙量和水质都将受到影响,主要表现在洞庭湖径流的年内分配比原来更加均匀,湖内泥沙淤积放缓,水质有所改善,枯水期污染物浓度有所降低等。为了更好地发挥三峡水库的作用,改善江湖关系,本文在分析基础上提出了一些建议。

Dongting Lake is linked closely with the Yangtze River in terms of geographical and hydrological elements. After the completion of Three Gorges Reservoir, water level, sediment and water quality of the Dongting Lake are all affected. The annual runoff distribution becomes more even, and sedimentation is alleviated. Water quality is improved in the lake. The concentration of pollutants in dry period is relatively less than that before. Recommendations are made on how to improve the relationship between the river and lake on the basis of this study, so as to bring the benefits of the Three Gorges Reservoir into full play.