The Analysis Of The Characteristics Of The Navigable Obstruction And The Research On The Channel Regulation Methods In The Changyeqi Reach Of The Upper Yangtze River

Changyeqi Beach is located in the Changyeqi Waterway.Yangtze River has a channel length of 632 km,and the right bank of the Yangtze River 2km upstream of Guoyuan Port.It is a curved river section with convex pebble beaches.The channel is shallow and narrow during low water levels and is a famous shoal on the Sichuan River.The water burial on the left bank of the upper moraine of Changye is one of the famous shoals of the Sichuan River during the dry season.the channel conditions have improved.On the whole,the treatment of this waterway is relatively difficult,and it is the key to improve the level of the upper reaches the water-sediment transport process,channel obstruction characteristics,and pebble beach risk evolution characteristics of the Changyeqi Reach are studied in detail,and on this basis,researches on remediation plans are carried out to seek a scientific and reasonable approach.The waterway improvement plan is critical to the successful improvement of this kind of pebble beach and tortuous waterway,and it also provides a reference for similar waterway improvement engineering research.This article is based on the “ Thirteenth Five-Year Plan ” of the Ministry of Transport’s "Thirteenth Five-Year" Yangtze River Economic Belt Upstream Waterway Key Construction Project "Model Test Study of the Guangyangba Waterway Improvement Project in the Upper Yangtze River" as the research background.Sediment and topographic data,analyzed the riverbed evolution of the Changyeqi reach;and through the establishment of a 1:100 normal river model test and theoretical analysis,the load transfer law was studied,and three remediation schemes were proposed and studied.Draw the following main conclusions:(1)Through the analysis of the river bed evolution,on the whole,the river regime of the Changyeqi Channel is relatively stable,and the river bed erosion and deposition rate does not change much;the long-leaf moraine deep level is relatively stable,but the beach and trough changes greatly,mainly affected by sand mining The shoreline of this section of the river has not changed much in recent years and has basically remained stable.(2)Based on long-leaf moraine physical model test and theoretical analysis,a trenching section design method based on load transfer characteristics is proposed.Using the principle of load transfer law and the joint control technology of trenching section design,the long-leaf The waterway regulation method of the moraine section provides theoretical guidance and technical reference for the regulation of such mountainous rivers.(3)Perform physical model tests on the three schemesand,the results of the experiments were analyzed and compared.For the channel remediation,scheme III was proposed as the recommended scheme.