The city of CiXi is typical Estuary of Zhejiang Province which has been influenced by human activity. The coastline has been dramatically modified by human activity of large-scale land reclamation projects in CiXi from 1997 to 2015. This study aims to develop and implement storm surge model and hydrodynamic model for river networks. The idea is to investigate the response to disaster prevention and reduction considering the change rate of storm surge, water level and discharge of flood. Due to cluster land reclamation, the change rate of storm surge is about 5-9% and the maximum storm surge has decreased by 8cm. The duration time of storm surge above 50cm has decreased by 1-3h. Besides, the average of the highest water level has dropped by 18cm and the discharge of flood has increased by 38m3/s. The findings of the study will be used to influence the management, development, and usage of coastal.
