| The approach channel is separated from the upstream and downstream of the hub.It is a comprehensive transitional channel for ships to adjust,park,wait and navigate safely through the hub.Usually,the upstream channel is located in the reservoir area.In addition to the operation of the flood discharge reservoir in the dam,the flow velocity is small and the flow condition is good,while the downstream channel is affected by the reservoir scheduling and the unsteady flow of the tail water of the power station.The oblique flow and the large fan circumfluence area are easily formed near the entrance area,which brings difficulties to the navigation of the ship and the navigation channel.At the same time,the internal and external static and dynamic water exchange of the channel causes the larger fluctuation of the water surface of the berthing zone,which is not conducive to the safe berthing of the ship.Therefore,exploring the characteristics of navigable channel flow is very important for ensuring the safety of navigation and improving navigation efficiency.This paper relies on the numerical simulation of the overall navigation flow conditions of the project of the Xijiang golden waterway upgrading and construction project,"the overall navigation flow condition of the project of the Rong Jiang shiplock expansion project." the general layout of the new ship lock,the gate area and the mooring section of the upper and lower reaches of the upper and lower reaches of the upper and lower reaches are used to simulate the conditions of the navigation flow.The author mainly writes the thesis through three parts:First,the established mathematical model is used to calculate the upper and lower selected section velocity,and the correctness of the model is verified by the measured velocity data.The results show that the flow velocity in most of the measured points is in good agreement,and it is within the error range,which proves that the built model can complete the calculation of the project.Second,on the basis of the original design layout scheme,the navigable flow conditions of the upstream channel in the upper and lower reaches of the hub are calculated and analyzed.The calculation results show that the maximum longitudinal velocity of the mooring section of the upstream channel is 0.76m/s when the high water level 134m water level is running.The maximum longitudinal velocity of the dead water level is 0.99 n/s when the dead water level 130m runs,and it is not satisfied to navigate to the navigation.Safety requirements,lateral maximum flow rate is 0.17m/s,slightly exceeding 0.15 m/s navigation requirements.The maximum longitudinal velocity of the mooring section is 0.74 m/s when the downstream discharge is only the reference flow of the generating unit,which is slightly more than 0.5 m/s for navigation safety.When the discharge of flood discharge is Q more than 11200m3/s,the maximum horizontal longitudinal velocity in the entrance area is not satisfied.In view of the problems existing in the original design scheme,the optimal scheme is proposed to increase the width of the upstream channel from 50m to 55m,the floor elevation is reduced to 123.7m and is set to the compound section.The calculation shows that the maximum longitudinal longitudinal velocity of the mooring section is 0.76m/s except the dead water level 130m,which is greater than that of the navigation safety index of 0.5m/s.All the other working conditions meet the safety requirements of the navigation,and it is suggested to take the way of extending the opening time of the lock valve to be solved.The downstream channel also increases the width of the channel from 50m to 55m,the planning route moves to the right bank side,lengthening the length of the dike,increasing the pier and changing the axial angle of the pier,so that all the indexes are basically met the navigation requirements.Because of the rush of time,this study does not study the flow conditions in the opposite Gate area,such as the length and angle of the piers.It is suggested that the next stage should be studied in order to obtain the best engineering layout. |
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