Study On Regulation Of Lianjiang Beach In Changjiang River

To improve the upper reaches of the Yangtze River waterway grade is an important part of the construction of the Yangtze River golden waterway,the upper reaches of the Yangtze River sheep stone plate-on the white sand channel as an important part of the Yangtze River channel,plays an important role in the channel level from the level Is an important part of the Yangtze River gold waterway construction.In the middle part of the river,the Qianliangstone beam is the middle water hazard beach,the lotus beach is the dry water shoal,the river and the river is the dry season,the beach risk type is diverse,the beach risk causes and the boundary condition are complicated,the remediation difficulty is Big.Therefore,to carry out mathematical model research,in order to give full play to its no scale benefits,the program is optimized quickly,the sensitivity test is convenient,in order to seek an effective,reasonable and economical waterway renovation program for the design and construction to provide scientific basis is necessary.In this paper,two-dimensional flow mathematical model is used to study the characteristics of water flow and its remediation measures in Qiankou Shiliang and Lian Shitan beach sections.The main contents and research results are as follows:(1)Based on the measured data,this paper discusses the evolution of river course and the recent evolution of river course,summarizes the law of river bed evolution and analyzes the evolution trend of river course.(2)The mathematical model of the two-dimensional water flow is calculated and verified by using the actual hydrological data of Qiankou Shiliang and Liantan Beach.The calculation parameters such as roughness and grid density can be obtained.(3)The flow field of the multi-stage flow is calculated by using the two-dimensional flow mathematical model.The flow condition of the beach section is analyzed in detail.The flow of the loach stone is difficult and rapid.The beach upstream of the Qianzha stone beam,grinding stone stone confrontation in the river,narrow channel,resulting in a small flow of water,bad flow.(4)According to the results of river bed evolution analysis,numerical simulation of water flow and measured data,the characteristics of beach hazard are studied,and the causes of beach risk are discussed.The boundary of the bank is very irregular,the reef is over,the beam is Tank suction and flow diffusion and other factors combined effect,the formation of water floods.There are no obvious deep troughs in the river,and the velocity of the section is evenly distributed along the river.The flow is scattered,the flow velocity is small,the sediment transport capacity is weak,and the siltation in the flood season is not enough The main cause of the river is the narrow river.(5)Combined with the characteristics of the characteristics of the beach,the regulation of waterway and the principles of remediation,to carry out remediation system of the system.Aiming at the problem of obstruction of each beach,the single beach renovation scheme is studied,and the single beach renovation scheme is put forward,then an overall scheme is formed,and the effect of the whole scheme is analyzed and optimized.The results show that the scheme has reached the design requirement after the scheme,and the velocity ratio in the tank flow rate is higher than that in the low flow rate,and it will not become a rapid influent beach,which will increase the sediment scouring ability The maximum beach judgment of the floodplain(the water and the small flow of the lotus beach)has been reduced to below the threshold value of the beach,and the problem of the rapid beach is basically solved.At the same time,the water condition But also has been more obvious improvement,water flow angle and cross flow reduction,the ship is more favorable.