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我国小水电季节性电能比重较大,其形成的主要原因有三。首先是自然条件方面。我国地处亚洲东部,地域辽阔,加以地形和季风影响及距离海洋远近的差异,各地降水量差别极大,因而河流年径流量变幅较大,丰枯流量相差悬殊。根据国内20条主要河流水文资料分析:北方的河流丰水期3～4个月的水量占年水量的70～80％;南方河流丰水期4～5个月的水量占年水量的60～75％。从年际间分析,丰水年超出平均年份的25～
China’s small hydropower seasonal electricity proportion, the formation of the main reasons for three. The first is the natural conditions. China is located in the eastern part of Asia with vast terrain. Influenced by the influence of topography and monsoon and its distance from the ocean, precipitation varies greatly across the country. As a result, the annual runoff fluctuates greatly and the flow of abundant and dry lakes differs greatly. According to the analysis of the hydrological data of 20 major rivers in China, the water volume of 3 ~ 4 months of rivers in the north accounts for 70 ~ 80% of the annual water volume; the water volume of 4 ~ 5 months of the south river flood period accounts for 60 ~ 75%. From the inter-year analysis, the wet years exceeded the average of 25 ~