Research And Improvingon On Flow Conditions At The Entrance Of Approaching Channel Of Curved Reach

The curved reach is the common plane shape of rivers in mountainous area and Mid-levels,it's hard to find the ideal along straight, broad section of river to arrange navigation electricity junction,so,the juction has to settle down at narrow curved reach,and the navigation security problem resulted at this is more prominent.The aporia is how to ensure the reasonable arrangement of junction and improve navigation current flow condition of entrance of lock approach.This article based on Tugutang Navigation and Electricity Junction in Xiang River,set about solving junction arrangement at the curved reach and researching improve navigation current flow condition of entrance of lock approach.This article combined physical model experiment and two-dimensional numerical simulation research method.Basing on analysis of current flow condition of The curved reach, it made experimental investigation of each arrangement plan of Tugutang Navigation and Electricity Junction,meanwhile,analysed the reason affecting navigation current condition in view of various plans,hereby proposed corresponding optimum proposal.And it also processed comprehensiveanalysis from discharge capacity of junction, navigation current condition and shipping sailing condition,putted forward the recommend plan of junction arrangement. At the same time, this article worked out related supplement of junction arrangement principle by combining experience of similar project,and so offered according to solve navigation safety problems about project likeness.Through discussing the mechanism that diversion pier can improve navigation current flow condition of entrance of lock approach,the two dimension mathematical model basing on DELFT3D model which used orthogonal curve grid about natural reach with complex boundary was built.By studying the influnce of navigation current flow condition of entrance of lock approach acted by the number of diversion piers and opposite space and so on, then,the relation among the number of diversion piers,opposite space,lateral flow rate and the longth of backflow area can be get by calculation.The research results would offer frame of reference for determining arrangement of diversion piers in practical engineering.