Beach Nourishment in Longfengtou Beach of Haitan Bay

Abstract:

The Longfengtou Beach of Haitan Bay in Fujian Province of China had wide beach and fine sand. Since the end of last century, due to the construction of artificial seawalls, the beach has been eroded seriously, and the dry beach width got shorter. How to prevent the beach from erosion becomes very important. The nourishment trail project in Phase One was put into effect to solve beach erosion in 2011. After the nourishment project, the shoreline still retreated seriously, with an average erosion of 11m and the maximum of 31m in 4 months. In order to solve this problem, beach nourishment and some other engineering schemes are put forward. The evolution model of Longfengtou Beach based on Generalized Model of Simulating Shoreline Change(GENESIS) model is established and verified well with the measured shoreline changes of the nourishment project in Phase One. With this verified model, the shoreline changes with different new engineering schemes are predicted, compared and analyzed. The results indicate that both the north and the south nearshore breakwaters protect the beach, but the coastline still suffers a certain degree of erosion and the schemes should be combined with seasonal beach nourishment to keep the shoreline after the project.