Optimization Research On Stagger Peak Discharge Of Double Lock Share Downstream Approach Channel

In recent years,the capacity of single lock has been saturated with the vigorous development of water transport,mots of them had been expanded into multi-line lock by sharing approach channel.Because water fluctuations superimposed,when double lock which share downstream approach channel emptying,water level amplitude is twice the single-line.The hydrodynamic force in the approach channel is not conducive for ship to pass or park.The problem in approach channel have been more and more serious.Scholars have comprehend the mechanism of water movement in approach channel by a series of studies of single lock with specific engineering,but the optimization research on double lock share downstream approach channel are not much.Article depends on Baishiyao water Hydro Project,do the optimization research on Stagger peak discharge of double lock share downstream approach channel through two-dimensional numerical simulation.First,analyze the comprehend the mechanism of water movement in approach channel.Proposed three optimization measures on the basic of full understanding of the factors affecting the hydraulic characteristics:(1)?change double lock stagger discharge time;(2)? change the valve opening time(3)? change the distance between double lock.The relationship between the surface amplitude?the maximum velocity and three measures.Research results are as follows:1?The dimensional mathematical model has been proved to be right by compare measured data and calculation results.The model can accurately simulate water movement when lock emptying.2?Through the principle of flow fluctuations,we know the measure of double lock stagger discharge time can avoid superimposing of the flow.Because maximum flow rate decreases,this measure can optimize water level amplitude and the maximum flow.This paper analyzes each working conditions lead flow conditions in the channel when T_r=0.1~1.4.We know that when T_r<0.6,the surface amplitude ? the maximum velocity are increase with the increase of the time;When T_r>0.6,the surface amplitude?the maximum velocity are increase with the increase of the time.The optimal staggered discharge time is 0.6.3 ?With the valve open time increases,maximum instantaneous sluicing flow decreases.This paper comparative analysis the flow condition of the valve opening time of 2min?3min?4min?5min?6min?7min?8min.The relationship between water levelamplitude and maximum velocity and valve opening time is linear and inversely.If the valve opening time is too long,it will affect the capacity of locks.Valve opening time should not exceed 8min.4 ?The theory of displacement distance is the same as stagger discharge time.Analyze the engineering measures of different distances between two downstream lock head.The measure has greater impact on flow conditions nearby lock head than the farther area.When Dr<160m,the surface amplitude?the maximum velocity are increase with the increase of the distance between two downstream lock head;When Dr>160m,the surface amplitude?the maximum velocity are increase with the increase of the distance.Three measures can be used to Baishiyao double lock optimal management because the optimization effect of the flow in the double lock sharing downstream approach channel.Also provides a reference for the transformation and optimization of other projects.