草尾河响水坎河段水流及碍航特性研究

Study on flow and navigation obstruction characteristics of Xiangshuikan reach of Caowei River

为了解草尾河响水坎河段水流及航道碍航特性,弥补原型实测资料的不足,采用正态定床水流模型试验,对现状条件下各特征流量的水面比降、水流动力轴线的位置、流场及航道流速沿程分布等进行深入研究。结果表明:研究河段水位落差随流量减小而明显增加,主要集中在阿弥石及灵官咀滩段长约4.8 km河段,设计流量下水位降落达3.59 m,占12 km研究河段水位总降幅3.78 m的95%;草尾河拟建航道等级为Ⅱ级,航道等级提升后水深将由2.0 m提高到3.0 m,阿弥石及灵官咀滩段大部分航段不能满足设计航深要求;同时受枯水期水流归槽,以及弯道河势、深潭、陡坎等复杂河床形态影响,阿弥石及灵官咀滩段为枯水期流急、水浅的碍航险滩。成果为研究河段航道整治思路的确立提供依据。

In order to understand the characteristics of flow and channel hindrance in Xiangshui section of Caowei River and to make up for the deficiency of the prototype measured data,the normal fixed-bed flow model test was carried out to study the water surface drop of each characteristic flow,the position of flow dynamic axis,the flow field and channel velocity distribution along the current condition.The results show that the water level drop of the studied reach increases significantly with the decrease of the discharge,mainly in the amishi and lingguanzuitan reaches 4.8 km in length,and the water level drop of the designed discharge reaches 3.59 m,accounting for 95%of the total drop of the water level of the 12 km studied reach 3.78 m.The proposed channel grade of Caowei River will be gradeⅡ,and the water depth will be increased from 2.0 m to 3.0 m after the upgrade of the channel grade.Most sections of Amishi and Lingguan Tsui Beach cannot meet the design depth requirements.At the same time,due to the influence of the flow back to the channel during the dry season,as well as the complex riverbed morphology such as bend river regime,deep pool and steep slope,amishi and Lingguanzui Beach section are the dangerous rapids with rapid flow and shallow water in the dry season.The results provide a basis for the establishment of the thought of channel regulation.