关键词: 沙卵石浅滩, 河床演变, 河工模型, 通航条件, 整治效果

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