来桂航道铜鼓滩—羊栏滩段航道优化设计

Optimal design of channel from Tonggutan to Yanglantan on Laibin-Guiping channel

黔江大藤峡水利枢纽下游段航道存在复杂的不良流态、海事多发、枯水期具有天然航道属性,航道尺度需要大幅度提升。针对这些问题,按照航道尽量顺直、加大弯曲半径等原则布置两条航道线路。采用通航水流条件模型试验,分析其连续滩群复杂的碍航水流条件,得出碍航滩险整治应消除挑流点、平顺水流边线、有效增大过水断面面积的优化思路。基于初步设计方案2提出增加弯顶段半径及其上下游炸礁范围、清除左侧边滩和右侧高滩的优化方案。经物理模型和船模验证后表明:优化设计方案能有效改善流态和航行条件。

The channel in the downstream section of the Qianjiang Datengxia hydro-junction has complex and unfavorable flow patterns,frequent maritime incidents,and natural channel attributes in dry seasons,and thus the scale of the channel needs to be greatly improved.Considering these problems,two channel lines are arranged according to the principles of straightening the channel as much as possible and increasing the bending radius.Using the model of navigation flow conditions for experiments,we analyze the complex navigation-hampering flow conditions of the continuous beach group and obtain the optimization idea of eliminating the deflecting flow point,smoothing the flow edge,and effectively increasing the cross-sectional area of the flow for regulating navigation-hampering shoals.On the basis of the preliminary design scheme No.2,an optimization scheme is proposed to increase the radius of the curved top section and its upstream and downstream reef-blasting range and clear the left side beach and the right high beach.The verification by the physical model and ship model indicates that the optimized design scheme can effectively improve the flow patterns and navigation conditions.