This research looked at what causes non-point source pollution, like pollution from farms or cities. They studied various factors, including how much pollution there is, how it changes over time, and how the environment can clean itself. They also looked at how farming, weather, and economic activities contribute to pollution. By studying all of this, they found out which factors have the biggest impact on pollution in different places and times. This study suggests collecting pollution data in the Three Georges Area to help understand and control pollution better.