The Regulation Technology Study On Low-flow Shallow-steep Pebble Beach In The Upper Reaches Of The Yangtze River

In response to the implementation of the national strategy for water transport development to meet local economic development;the state to build a resource-conserving society;improve the service capacity of the integrated transportation system in the upper reaches of the Yangtze River;create a shipping logistics center in the upper reaches of the Yangtze River and activate regional development potential;High grade is very necessary.At present,the dry and shallow pebble beach in the upper reaches of the Yangtze River is more common in the Syrian-Serbian section.The previous ratio of remediation ideas cannot be fully applied to this type of beach insurance demand.Therefore,by adjusting the ideas of rectification,the idea of relying on water in the dry season to attack the sand was turned into an improvement of the water level in the middle water period to enhance the sediment transport capacity,and prolonged the receding time.This project relies on the Fork Yukang Waterway Waterway Regulation Project,through the establishment of a two-dimensional mathematical model of water flow on the numerical simulation of the study of the river section,optimize the remediation program,the main work content and research results are:（1）This paper analyzes and collates a large number of measured data and analyzes the laws of water and sediment movement and the laws of pebble movement in the study river reach.The regularity of the flow rate in the rehabilitative section and the characteristics of the size of the pebbles were determined,and the shaping effect of the currents on the shape of the rivers this year.（2）A two-dimensional mathematical model for the study of the Fork-Yu River section was established,and the distribution law of the water level and velocity of the engineering section and the ship’s ability to cross the beach were analyzed under different flow rates,and the obstacles of the beach section were summarized and summarized.Characteristics and causes of beach insurance.（3）Relies on dredging only as the first type of project in engineering river sections;the width of the different rectification lines is used as the second type of remediation scheme during the remediation of dry water;the reclaimed water level is used as the third type in the first and second internal foundations.Program.The results of the program test study show that on the basis of meeting the normal navigation of the ship,the conventional excavation and displacement of the dam cannot meet the requirement of the stability of the navigation channel,and the elevation of the building height is used to increase the flow of the middle-water period to the river channel.In the capacity,the river can not only navigate the hydraulic indicators but also maintain the stability of the navigation channel.（4）Summarized the rectification principle of the shallow dry pebble beach in the Suiyu section,the rectification ideas,the water level of the remediation and the width of the rectification line.It is proposed that the water level of the reclaimed water takes 1m under the average annual flow for many years,and the relational formulae B=B₀（h₀/h）^8/7for the width of the reclaimed water line are deduced from the same perspective of the sediment transport capacity before and after remediation.This type of remediation technology summed up the shallow water in the later rehabilitated section.Emergency pebble beach governance has a reference role.