Beach restoration strategy influenced by artificial island: a case study on the west coast of Haikou

The construction of artificial islands brings new environmental problems while alleviating the contradiction between man and land in the coastal area. Focused on the imbalanced sediment budget and beach erosion problem caused by artificial island, a shoreline evolution model of Haikou west coast using GENESIS was built, in order to study the beach morphological evolution mechanism and restoration strategy influenced by artificial island. The main conclusions include: 1. the impact of “Nan Hai Ming Zhu” artificial island on adjacent beach in Haikou bay is characterized by “deposit at the back of the island and erosion on both sides”, and the response amplitude of erosion hot spots on both sides is obviously different. The erosion from Wuyuan Estuary to new State Guest Hotel is more intense, mainly due to the insufficient supply of alongshore sediments and the convex shape of shoreline. 2. With the ecological restoration measures of combining sand nourishment and recycling, the reasonable distribution of alongshore beach sediments and the dynamic balance of landforms can be realized and the problem of coastal erosion caused by artificial island can be effectively alleviated. The results can provide an useful reference for the beach restoration on the similar coasts in China.