长江上游火焰碛滩航道整治工程方案

Channel regulation project plan for Huoyanqi Beach in upper reach of Yangtze River

针对长江上游火焰碛滩易出浅碍航、航槽内水深不满足规划要求的问题,提出两种不同的整治方案。采用非结构化网格,建立工程河段的平面二维水流数学模型。使用原型实测水文资料验证模型的可靠性,通过计算得出两种方案在不同工况下的水位、流场、消滩判数等主要参数。结果表明:两种方案均能实现预期整治目标,但通过后延火焰碛顺坝并新建3道刺坝的整治建筑物布置方案,工程量较大,且封堵了后续滩段航槽调整的可能;通过延长顺坝坝头接岸的方案,大幅降低了工程量,也为后续滩段航道调整留有空间。

In view of the problem that the Huoyanqi Beach in the upper reach of the Yangtze River is prone to being shallow and obstructs navigation,and the water depth in the navigation channel does not meet the planning requirements,we propose two different regulation plans.We use the unstructured grid to build a planar two-dimensional flow mathematical model of the engineering river section,apply the measured hydrological data of the prototype to verify the reliability of the model,and calculate the main parameters such as water level,flow field,and beach dissipation criterion of the two plans under different working conditions.The results show that the two plans can achieve the expected regulation goals.However,the regulation building layout plan of extending the Huoyanqi dam and building three new spur dams requires a large amount of work and blocks the possible of subsequent adjustment of the navigation channel in the beach section.By extending the plan of connecting the dam head to the shore,the amount of engineering work is greatly reduced,and it also leaves space for subsequent adjustments to the channel in the beach section.