TIDALLY-DRIVEN BEACH CHANGE: INSIGHTS FROM LONG-TERM AND LiDAR MONITORINGS

Coastal erosion is caused by a variety of factors, including waves, currents and tides. Periodic rise and fall of sea level, the tide, is known to affect beach morphological changes through the processes: wave runup infiltration and groundwater exfiltration. This study provides new insights into tidally-driven beach morphological change processes by analyzing 24 years of long-term beach monitoring data and one month of high-frequency observation data using LiDAR. This study focused on the processes in the upper swash zone, which is located above the mean water level (M.W.L.).