关键词: 洪水地区组成, 洪水遭遇, 洪水概率统计, 雅砻江, 川江

Abstract: In order to make rational use of flood storage capacity of cascade reservoirs on the Yalong River and the middle and lower reaches of the Jinsha River, and reduce the flood control pressure, on the basis of the observed data at Xiaodeshi Station, Lizhuang Station and Cuntan Station from 1959 to 2016, the flood region composition and encounter law for the Yalong River and the Chuanjiang River were analyzed. The results showed that the flood peak at Xiaodeshi Station, Li Zhuang Station and Cuntan Station generally appears during June to October, in which the appearing probability during July to September is 95%. When the maximum annual 3d,7d and 15d floods occurred at Lizhuang Station and Cuntan Station, the occurrence probability of the corresponding flood at Xiaodeshi Station increased with the flood duration. In the flood composition at Lizhuang Station on Chuanjiang River, the flood volume at Xiaodeshi Station and Panzhihua Station account for the same proportion of the flood at Lizhuang Station, and all increase with the flood duration. In the flood composition of Chuanjiang River, the flood proportion of Xiaodeshi Station on Yalong River is close to area ratio, while the proportion of Pingshan Station on the Jinsha River is smaller than its area ratio.