汉江下游典型长顺直河段航道整治效果分析

Effect analysis of typical long-straight section channel regulation project in downstream of Hanjiang River

长顺直河段演变常表现为边滩不稳、过渡段深泓摆动,从而引起航道变迁。以汉江下游典型长顺直河段麻洋潭滩段为例,通过对该滩段航道整治工程前后的河床演变、模型试验、整治效果等方面的分析,对汉江下游长顺直河段航道整治经验进行总结。研究结果表明,针对长顺直段过渡段稳定性差的问题,通过合理规划航道轴线,采取工程措施塑造优良的微弯型整治线,能有效稳定航槽;在采用较低的整治水位时,通过缩小整治线宽度和整治建筑物间距,可达到提高过渡段航道尺度的目的。

The evolution characteristic of long-straight section channel often appears the unsteadiness of the beaches and the thalweg in the changeover portion,which causes the change of navigation channel.Taking a typical long-straight section channel named Mayangtan in the downstream of the Hanjiang River as an example,and based on the analysis of river evolution,model test and regulation effect before and after the regulation project,we summarize the experience of the long-straight section channel regulation project in the downstream of the Hanjiang River.The results show that,for the unsteadiness of the beaches and the thalweg in the long-straight channel,we shall plan reasonably the channel axis and take engineering measures to create micro-bend regulation lines,so as to stabilize effectively the navigation channel.When a lower regulation water level is adopted,by narrowing the width of regulation lines and the distance between regulating structures,the purpose of improving the channel scale of the transition section can be achieved.