湘江营田滩河段2000t级航道整治工程效果数值模拟

Numerical Simulation on the Effectiveness of Regulation Project for 2000t Navigation Channel of Yingtiantan Segment of Xiangjiang River

营田滩位于湘江濠河口至城陵矶河段,为洞庭湖区洪道,具有典型的河湖两相性,浅滩演变规律复杂。近年来本滩段的采砂活动日益增多,对河床的边界破坏很大,通航水流条件受到影响。在湘江2 000 t级航道建设一期工程中,需采取相应的整治措施,以提升航道等级,满足规划要求。针对营田滩河段的具体碍航特性,提出了相应的整治措施,采用平面二维水流数学模型,对整治效果进行了分析论证。结果表明:设计方案满足航道整治规划要求,右汊方案中洪水期航道水流条件不受上、下挖口入汇水流的影响,又有利于地方经济发展,建议右汊方案作为整治工程的推荐方案。

Yingtiantan is located at the segment between Haohekou and Chenglingji. It is a flood channel of Dongting Lake and has typical characteristics of rivers and lakes with complex shoal evolution. In recent years, ri- verbed has been damaged seriously by activities of sand excavation. Regulation actions are proposed in order to im- prove the channel level in the first-stage of Xiangjiang 2000t channel construction project. The effect of the pro- posed regulation actions are analysed by using 2-D mathematical flow model and the results indicated that the pro- posed two design schemes could both meet the design requirements. The right branch scheme is recommended be- cause the flow condition in the channel is not affected by the confluence of the upper and lower stream opening. It could also contribute to local economic development.