The study looked at how the slope of a beach affects changes in its shape and movement of sand under different types of waves. They found that steeper slopes have more noticeable changes and move more sand compared to gentler slopes. When waves are strong, sand moves away from the shore, but when they are weak, sand moves towards the shore. The direction and amount of sand movement are related to the energy of the waves and the slope of the beach. The way sand moves in the shallow water near the shore is different between steep and gentle slopes, likely due to differences in wave energy and interactions between waves and the shore.