The study looked at how wooden blocks placed on a beach are affected by waves. They did experiments in a wave flume with different block placements and wave conditions. The height of the blocks above the sand didn't matter much. The blocks moved based on the wave action and their position on the beach. A model was made to predict how likely the blocks were to float, slide, or stay put. The model's predictions matched well with what actually happened on the beach. To predict how blocks will behave on a beach, we need to accurately predict how the beach itself changes.