深水库区急弯段航道通航能力提升方案

Improvement measures for navigation capacity of bend waterway in deep reservoir

随着三峡和葛洲坝枢纽通航能力的提升,两坝间航道仍是制约长江干线航运发展的瓶颈,其中石牌弯段则是主要碍航段之一。针对石牌弯段采用原型观测和三维数值模拟方法,分别开展隧洞引流和通航隧洞方案的研究。结果表明,深水库区弯曲航道因分流隧洞进出口水面比降小、流速低,分流量极其有限,无法达到预期分流效果和改善急弯段通航条件的目的;采用隧洞通航方式,水力指标基本满足规范要求,可有效提升通航效率。研究成果可为深水库区急弯航道通航能力的提升提供理论支撑和技术参考。

With the improvement of the navigation capacity of the Three Gorges and Gezhouba junction,the channel between the two dams is still the bottleneck that restricts the development of the Yangtze River shipping,and the Shipai bend section is one of the main obstructing sections.Aiming at solving the navigational obstruction problem of the Shipai bend,three-dimensional numerical simulation as well as prototype observation are adopted to carry out methods of diversionary and navigational tunnel.The results show that due to the small surface slope and low flow velocity at the entrance and outlet of the diversion tunnel of the bend waterway in a deep reservoir,the drainage capacity is extremely limited,the diversion results and the improvement of navigational conditions can t be achieved as expected.By using the tunnel navigation mode,the hydraulic index basically meets the standard requirements and can effectively improve the navigation efficiency.The research results can provide theoretical support and technical reference for improvement of sharp bends navigability in a deep reservoir.