Abstract: The study focuses on Jinshiwan Beach in Raoping county, Guangdong province. Using airborne LiDAR measurement equipment, the study collected data on the beach and tidal flats before and after storm surges. The accuracy of the LiDAR point cloud data is assessed, and a digital surface model (DSM) is generated from the acquired point cloud data. The DSM is processed to obtain the comparative elevation difference of the coastal tidal flats, and to analyze the erosion changes of the coastal tidal flats before and after the storm surge. The results indicate that the elevation errors in the LiDAR point cloud data are 2.8 and 5.4 cm for the two measurements. Following the storm surge, the western part of the coastal tidal flats exhibit minor erosion, while other areas experience sediment deposition. This research provides reliable and accurate data support for investigating marine disasters such as storm surges and coastal erosion at the study site.

Key words: airborne LiDAR, storm surge, coastal tidal flats, erosion