The scientists studied how to predict tidal levels in the lower Yangtze River. They found that the water levels are influenced by factors like discharge and tidal range. By analyzing these factors, they created equations to forecast tidal levels accurately. They focused on five tidal stations along the river and considered both river discharge and astronomical tides. By including tidal range in their equations, they improved the accuracy of their predictions. The results show that their method can effectively forecast tidal levels in the Yangtze River.