Study On The Morphological Characteristics And Effective Width Of Curved Channel In The Upper Reaches Of The Yangtze River

The upper reaches of the Yangtze river are typical mountain rivers with complex boundary conditions,numerous curved rivers and poor flow conditions.The ship is subjected to a complex and irregular curve movement due to many factors during the navigation of these curved sections.Ships sailing in the curved channel are often more difficult to navigate safely in the straighter passage because of the constraints of the circulation and plane configuration of the curved channel.This article through to the Yangtze river upstream of the track line of typical curved reach data statistics,use the three dimensional flow mathematical model and ship coupled motion model,analyzed the curved reach hydraulic characteristics and the influence of the force and motion of the ship,the mountain bend channel morphology and flow condition to the effect of the effective air wide way.The main achievements of this article are as follows:(1)typical curved reach morphological characteristics and statistics the upstream of the Yangtze river shipping track line features of different time points measured,it conclude that the typical curved of upper Yangtze river its bending radiusbetween 560 m and 1470 m,bending Angle range between 55 ° ~ 145 °,provide the basis for the establishment of the model tank.(2)the flow structure characteristics of the curved river are studied by numerical simulation of three-dimensional flow.The influence of different velocity and depth of water depend on the surface flow field of bajiaoyan?heishizi?lanbaqi river was analyzed.The change of the flow structure in the curved channel provides the basis for the analysis of ship force.(3)by ship coupled motion mathematical model,the flexural river bend radius,the force characteristic parameters such as flow velocity,water depth and other factors to the ship,the influence of the analysis of the ship in the corner under different conditions were lateral force and yaw moment of change.(4)under different conditions by means of sailing ship floating drift angle and distance analysis,discusses the different bending radius,depth and velocity conditions on the ship upward drift Angle and drift away from the influence of the largest,analyzes the different bending radius,depth and effective navigation flow conditions on the corner efficient necessary wide influence.