NUMERICAL INVESTIGATIONS ON EFFECTS OF THE RECLAMATION PROJECT ON HENGSHA EAST BEACH IN THE YANGTZE ESTUARY DEEPWATER CHANNEL

摘要

The effects of the Reclamation Project on the Hengsha East Beach in the Yangtze Estuary Deepwater Channel have been numerically simulated with an improved ECOM model. The results indicate that the project only has influences on the tide levels of the Baozhen, Liuxiao in the North Channel, and the Hengsha, Beicaozhong, Niupijiao in the North Passage, while the change in magnitude is within 5 cm. So it won't have much impact on the flood control of the Yantze Estuary. The Reclamation Project makes increase in the resistance of the flow in the North Passage as the project blocks off part of the flood tide flow which formerly enters the North Passage through Hengsha East Beach, and this will result in the decrease of the tide velocities in the North Passage. The project won't produce distinct effects on the splitflow ration between the South Channel and the North Channel as well as on that between the South Passage and the North Passage, which means it won't make negative effects on the Yangtze Estuary Deepwater Channel Regulation. Meanwhile, the Reclamation Project makes the high beach stable, and eliminate the current along the bank that is at the outboard of the North Jetty in the reclamation region, so the project will make positive effects on the stability of the North Jetty. And the conclusion can be obtained that the Reclamation Project on Hengsha East Beach is fit for the sediment treatment in the Yangtze Estuary Deepwater Channel Regulation as well as the river bed evolvement.