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五、三峡工程以上及宜汉间洪水地区组成 1.三峡工程以上地区洪水组成分析宜昌以上长江流域面积约100万平方公里,金沙江来水是宜昌洪水的基础部分,嘉陵江洪水则是宜昌洪峰和短时段最大洪量的主要组成部分。寸滩至宜昌的三峡区间,源短流急,暴雨强度大,有时也形成瘦高洪峰,迭加在寸滩来水之上,形成宜昌的年最大洪水。由上游规划的最后一级控制性水库所控制的流域面积约71万平方公里,从这些控制性水库到宜昌区间面积约29万平方公里,无水库控制,又是较大暴雨区,有名的川西、川北暴雨区都在这个范围。根据多年统计分析,在各水库控制区以上约占宜昌以上70％的流域面积上产生的洪水总量,与无控制区约占宜昌以上30％的流域面积
V. Composition of the Floodplaces above the Three Gorges Project and between the Yixian and Han Dynasties 1. Analysis of floods in the areas above the Three Gorges Project The Yichang area with a catchment area of about 1 million square kilometers in the Yangtze River and the incoming water from the Jinsha River are the basic parts of the floods in Yichang. Short period of time the main component of the maximum flood. Cuntan to the Three Gorges section of Yichang, the source short stream urgent, heavy rain intensity, and sometimes the formation of tall peaks, superimposed on the inch beach water, forming the largest annual flood in Yichang. The controlled watershed controlled by the last-stage controlled reservoirs in the upstream plan covers an area of about 710,000 km2. From these controlled reservoirs to the Yichang section of an area of about 290,000 km2, without reservoir control, it is also a large rainstorm area with well-known western Sichuan, North Sichuan rain area are in this range. According to many years of statistical analysis, the total amount of floods above the reservoir control area accounts for about 70% of the basin area above Yichang, which accounts for about 30% of the basin area with no control area