Abstract:In view of the downstream outlet of Fenghuangjing pumping and drainage station that diagonally flows into the downstream outlet connection section of the ship lock,its dispatching and operation mode has adverse impact on the navigation flow conditions.Through the physical model test of the whole fixed bed,the influence of the Fenghuangjing pumping and drainage station on the navigation flow conditions of the outer connecting section of the downstream gate of the ship lock under different dispatching modes is systematically studied.The test results show that under the self-discharge condition of the drainage from the West River to the Yangtze River,the water flow obliquely flows into the downstream connection section of the ship lock,resulting in the maximum lateral velocity of the intersection area reaching 0.48 m/s,which has a great influence on the navigation flow conditions of the connection section.In contrast,the lateral flow velocity is only 0.28 m/s under the mechanical diversion condition of the Yangtze River to the West River diversion,and the influence degree is relatively small.Further research has found that the lower the water level on the Yangtze River side,the more significant the influence of the outflow of the pumping and drainage station on the navigation flow conditions of the connecting section.Taking the self-discharge condition as the most unfavorable condition,the engineering optimization scheme of adding a permeable diversion wall between the drainage channel and the connecting section of the pumping station is proposed.The test shows that the measure can effectively control the transverse velocity within 0.30 m/s.
