关键词: 降水, 梅雨, 太阳活动, 厄尔尼诺事件

Abstract: According to the historical and observed data of precipitation,the characteristics of precipitation in Yiwu were analyzed by statistical method.The results indicate that there are more waterlogging years and fewer drought years in high flow period in Yiwu.On the contrary,there are more drought years and fewer waterlogging years in low flow period in Yiwu.Precipitation increases obviously in the current or next year of El Nino events,while in reverse in the current or next year of La Nina events in Yiwu.The time of Meiyu season comes early and ends late in high flow period,average duration of Meiyu season is longer and average precipitation amount increases in high flow period,but it is just the contrary in low flow period.The beginning date of Meiyu season appears between 6th and 15th,June in Yiwu with maximum probability,however,the end date does not show the regularity.The end date of Meiyu season delays in the current or next year of El Nino events,and it comes ahead in the current or next year of La Nina events.This study would be helpful to artificial precipitation operation in the source area of reservoir during rainy season.