Beaches are important for protecting coastlines and ecosystems, but storms and waves can cause erosion. Researchers studied Dongsha Beach in China to understand how it changes over time. They found that longshore sediment transport is the main reason for erosion, and the beach is not in equilibrium. Waves and currents play a big role in shaping the beach, with waves coming from the east. To keep the beach stable, they recommend using small sediment in nourishment projects and focusing on specific areas for nourishment. This study helps predict future beach changes and can guide decisions on managing beaches more effectively.