Abstract: The study aimed to investigate the influence of typhoons occurring in the northwest Pacific on rainfall at the Changchunling Rainfall Station in Zhoushan. By analyzing a long-term monitoring dataset spanning from 1980 to 2019, we explored the impact of typhoons on rainfall patterns. The findings revealed that, on average, typhoon rainfall at the Changchunling Station accounted for 72.55% of the total precipitation during the typhoon season. Specifically, typhoons making landfall in Zhoushan, and those in Zhejiang, as well as typhoons making landfall in other areas and non-landfall typhoons, contributed an annual average rainfall of 29.45 mm, 126.23 mm, and 364.68 mm to the Changchunling station, respectively. Furthermore, individual typhoons of the three types brought rainfall of 300.65 mm, 157.78 mm, and 71.28 mm to the Station. The study highlights that the overall precipitation at the Station is significantly influenced by typhoons generating rainfall exceeding 50 mm. Among these, the typhoons making landfall in Zhejiang, particularly those producing rainfall amounts above 50 mm, exert the greatest impact. In addition to the landfall location, the path direction of the typhoon emerges as the primary factor influencing rainfall patterns at the Changchunling Station, followed by its intensity and moving speed. These findings provide valuable insights into comprehending the formation of water resources on Zhoushan Island, offering significant implications for further research in this area.

Key words: precipitation, typhoon, long-series hydrological monitoring data, correlation analysis, impact factors, water resource