Coastal erosion is a big problem caused by climate change and human-made structures. To protect coastal areas, sand dunes are used, but predicting how waves move sand is tricky. A study recreated a storm in a lab to understand how dunes and beaches change during and after a storm. They used advanced tools like cameras and sensors to measure waves and sediment movement. The study found that different wave conditions can either erode or build up the beach, which is important for designing effective coastal protection measures.