山区河流复杂桥群河段通航水域研究

Navigable water area of river segments with complicated bridge groups in mountainous rivers

城区段大型山区河流受两岸城市规划、行洪、征地等多因素限制,新建跨河桥梁线路选择较为困难;此外还存在已建跨临河建筑物较多且修建年代并不一致,形成复杂的桥群河段且各桥梁的通航技术标准各异的情况。采用平面二维水流数学模型对拟建大桥所在桥群河段水动力条件、有效通航水域范围进行分析研究,同时结合船舶操纵模拟试验对拟建大桥修建后的桥墩布置情况、船舶航行通过桥群河段的安全性进行研究。结果表明,经过工程措施后,桥区河段的通航水流条件得到改善,拟建大桥船撞概率极小,桥群河段确定的通航水域是合理的。

Due to urban planning, flood discharge, land acquisition, and other factors, it is difficult to select new river-crossing bridge routes for large mountainous rivers in urban areas. In addition, many buildings have been built across the river, and they have been built in different years, which thus forms river segments with complicated bridge groups, and each bridge has different technical standards for navigation. This paper uses a planar two-dimensional flow mathematical model to analyze in detail the hydrodynamic conditions and the range of effective navigable water area of the river segments with bridge groups for the bridge to be built. At the same time, through the ship control simulation test, the paper studies the arrangement of piers and the safety of ships sailing through the river segments with bridge groups after the bridge is built. The results show that after engineering measures are implemented, the navigable flow condition of the river segments in the bridge area is improved, and the ship collision probability for the bridge to be built is very small. Therefore, the navigable water area determined by the river segments with bridge groups is reasonable.