Abstract: Jinzhongqi shoal，the confluence of the Yangtze River and Tuo River transitional shallow sand bed，by which the river is divided into two slots． The left slot is deeper than the right one． This beach section is of more serious navigation condition that ship has more difficulty to pass this section． And this section is the key maintenance of Chongqing section of rapids in the dry season． Firstly，the evolution rule of riverbed and the cause of navigation blocking are analyzed; and then combining with the study on physical model test，the analysis on the navigation flow condition of this shoal after dredging and dam remediation measures is carried out． Finally，through the analysis on the regulation effect，it is found that the navigation blocking disappears and the navigation condition is greatly improved，which achieves the goal of channel regulation design． The regulation design of Jinzhongqi shoal provides a similar reference for the rectification of similar shoal in mountainous river．

Key words: sand pebble shoals, riverbed evolution, river engineering model, navigation conditions, regulation effect

摘要： 金钟碛为长江和沱江汇合口过渡段沙卵石浅滩。它将河道分为左右两槽，右槽较浅，左槽较深，滩段碍航状 况较为严重，船舶过滩比较困难，是叙渝段枯水期重点维护滩险。在基于河床演变规律和分析碍航原因的基础上， 结合河工模型试验研究，分析了采取疏浚和筑坝整治措施后滩段的通航水流条件。通过对整治前后的效果比较， 发现碍航险情消失，达到了设计整治效果，对山区河流类似浅滩的整治提供了借鉴。

关键词: 沙卵石浅滩, 河床演变, 河工模型, 通航条件, 整治效果