The researchers studied how the north beach in the Yellow River Delta is eroding and depositing over time. They collected data on waves, tides, sea level, and sea ice to understand the factors influencing the beach's changes. The results showed that the beach erodes quickly, especially in spring and autumn, and storm tides can cause significant deposition. Sea level rising has a small impact on erosion, while sea ice helps protect the beach. The erosion and deposition processes are not consistent throughout the year, with erosion not just happening in winter and deposition not just in summer.