Abstract: Land subsidence is an important factor endangering the urban flood prevention safety.The effect of land subsidence on the urban flood prevention safety in Shanghai is analyzed based on the monitoring results of the land subsidence and the yearly highest tide height of the Huangpu River,considering the previous heighten and subsidence conditions of the flood defence wall in the Bund.The land subsidence is a key link of the urban calamity system.The monitoring and control of the land subsidence is...