巢湖兆河口门航道整治工程探讨

针对兆河入湖口门附近存在拦门沙碍航问题,采用实测资料分析和三维水沙数模计算相结合的研究方法,研究风生浪流动力作用下湖区泥沙输运特征,探讨口门航道整治方案布置。研究结果表明,巢湖底沙粒径较小,大风天风浪在近岸浅水区发生变形破碎,使水体含沙量增大,在风生湖流作用下,近岸泥沙表现为"波浪掀沙、湖流输沙"的运动特征。结合以往航道治理实践经验,提出整治与疏浚相结合的思路,多方案比选计算结果表明,筑堤方案可明显减小航槽淤积量,其中双侧筑堤方案整治效果更优。综合比选推荐采用双侧筑堤高坝缓坡方案。研究成果可为类似湖区口门航道整治提供借鉴。

Discussion on channel regulation at Zhaohe River estuary entering Chaohu Lake

Aiming at the navigation-obstruction problem by sandbar near the Zhaohe River estuary,we adopt both field data analysis and 3-D flow sediment model to investigate the characteristics of sediment transport under wave and current,and discuss the layout of channel regulation scheme. Results show that wave breaking in shallow water will increase sediment concentration at the Chaohu Lake. Under the action of wind-induced lake current,the nearshore sediment is characterized by wave lifting sediment and lake current transporting sediment. Combining with the practical experience of channel regulation,we put forward the idea of integrating channel regulation with dredging. By evaluating various schemes,we know that the dike-building scheme can obviously reduce the siltation amount of the channel,and the bilateral dike-building scheme shows a better effect. The high bilateral dike scheme with gentle slope scheme is recommended through comprehensive analysis.This research will provide technical reference for similar channel regulation near the river estuary into the lake.