Impact on Dongting Lake channel caused by the change of flow and sediment environment after Three Gorges Project impoundment
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摘要: 江湖关系变化是影响洞庭湖水文泥沙环境的重要因素,关系到湖区航运的安全。以实测水文及地形数据为基础,研究了洞庭湖区水沙环境的变化特征,并分析了其对湖区航道的影响。结果表明:① 三峡蓄水后,枯季湖区月均流量趋于减少,湖区淤积减缓甚至出现冲刷,枯水期湖口低水位有所上升,湖面比降趋于降低;② 受来沙减少影响,湖区航道有所冲刷,湖口低水位上升使得湖区通航保证率水位有一定幅度上升,航道水深增加,三峡蓄水初期江湖关系变化对湖区航道的影响总体为积极因素,对湖区湘江航道的影响要大于开湖航道。Abstract: The change of river-lake relation is one of the most important factors affecting the flow and sediment environment in the Dongting Lake area. This has a great influence on the safety and development of lake shipping. On the basis of the hydrological and topographical field data, this paper studies the variation in the characteristics of the water-silt environment and then analyzes its influence on the lake channel. The following results were observed that after the project impoundment: ① The mean monthly discharge in dry seasons tends to decrease, the siltation in the lake area slows down and even scours, the low water level at the lake outlet rises to a certain extent, the water surface gradient in the lake tends to decrease; ② The decrease of incoming sediment causes the channel incision, and the rise of low water level at the lake outlet increases the channel water level, the channel is therefore deepened. The river-lake relation is overall positive factor for the lake channel and the benefits for the Xiangjiang channel are more than that for the Kaihu channel.
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期刊类型引用(10)
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