Investigation On Waterway Regulation And Navagition Technology Of Wujiang River Under The Influence Of Hydropower Station Operation

Most of the rivers in the mountainous area are the pivotal canalized channel.In the course of the hub scheduling,the fluctuating backwater zone or the dehydration section channel becomes the focus of the study because of the large amplitude of water level regulation and poor navigation conditions.This kind of channel has not only the problem of "line",but also the problem of the "point" of the connecting section in the junction area.In this paper,on the basis of Wujiang river which is representative tributary of the Yangtze River,the study of waterway regulation and navigation problem under the influence of hub operation is commenced.The main contents and conclusions are as follows:(1)The study on method for determining width of regulation line of inland waterway is conducted.Instead of the previous theory which need to assume the same parameters before and after the project in order to avoid relevant problem,Based on the study of river water movement,sediment movement and river bed morphology,a new method for determining the width of two kinds of waterway regulation lines is proposed under the condition of continuous scouring and sediment transport through theoretical analysis and deduction.(2)For the first time,the ship simulation method which is based on the coupling model of river unsteady flow mathematical model and ship motion mathematical model is used to demonstrate and study the construction scheme of 1000 t class channel under the influence of hub scheduling.According to the proposed method of determining the channel regulation line in this paper,the width of the channel regulation line is clarified,and the preliminary waterway regulation scheme is determined.The hydrodynamic conditions and their changing rules of construction scheme of 1000 t class channel under the influence of the adjustment of the hub day is proposed by two-dimensional unsteady flow mathematical.Then,the ship simulation theory and test method are proposed,which are coupled with two-dimensional unsteady flow mathematical and the mathematical model of ship motion.The ship maneuver simulation experiment is carried out in response to unsteady flow.As a result,Navigation rules are proposed.(3)A semi-implicit non-hydrostatic numerical model for 3-D water flow is developed and verified.A mixed triangle and quadrangle horizontal grids is used to discretize the projection on horizontal plane of 3D physical domain.A third-order pressure approximation of the top-layer is proposed to minimize the number of vertical layers and subsequently the computational cost.A conservative and efficient three-dimensional non-hydrostatic numerical model is constructed by using the finite volume method and semi-implicit fractical step scheme based on the mixed triangle and quadrangle horizontal grids,the results show that the model has good accuracy and reliability by means of three dimensional linear standing wave,free oscillation of water surface,three dimensional flow of the channel and the practical example.(4)Study on the application of waterway regulation and the development of new diversion pier structure in the mouth area of Silin Hydropower Station in Wujiang River.Based on the newly constructed three-dimensional non-hydrostatic numerical model,the calculation of the lower reaches of the Wujiang Silin hub was carried out to determine the location of the mouth area,and the design scheme of the mouth area was studied.Focusing on the problems of engineering layout and the problem of engineering implementation,a new type of diversion pier structure with independent intellectual property rights is designed.Through the calculation and optimization,the improvement scheme of the mouth area is put forward to meet the demand of project construction.