Channel characteristics and maintenance countermeasures of Chayuqi beach in upper reaches of the Yangtze River
Chayuqi is a transitional shoal in the upper reaches of the Yangtze River,located in Luzhou and belonging to the natural river section.In 2013,the Xiangjiaba Hydropower Station completed water storage,and in 2015,the minimum maintenance water depth of the upper reaches of Yangtze River waterway increased from 2.7 meters to 2.9 meters.Prior to the ban on mining in 2016,the disorderly excavation of sand and stones caused significant damage to many upstream beach sections,resulting in dispersed water flow and weakened erosion capacity during the dry season.Against various backgrounds,the smooth navigation of navigation channels in the upstream of the Yangtze River faces significant challenges during the dry season,and the Chayuqi shoal section is one of the representatives.This article analyzes the changes in water and sediment conditions before and after the impoundment of Xiangjiaba Hydropower Station based on measured data,summarizes the evolution laws of the beach section in recent years,and analyzes the maintenance and dredging strategies of the beach section based on the implementation of channel maintenance and dredging in recent years,dredging effects,and related issues.It provides relevant suggestions for the design and construction of the beach section maintenance and dredging,as well as the treatment plan for adding and disposing buildings,which can provide technical support for the future maintenance and management of the the beach section.
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