The researchers studied how a water diversion project from the Yangtze River to the Huaihe River affects the water age distribution in Lake Caizi. They used a model to predict the water ages in different seasons and under various wind conditions. The results showed that the project will change the flow patterns in the lake, with different wind directions impacting water exchange in different parts of the lake. Overall, the water diversion project will significantly alter the water age distribution in Lake Caizi, especially during the dry season when water diversion is most pronounced.