多方法集成的三峡水库洪水分期研究

Study on flood periodization of Three Gorges Reservoir based on multi-method integration

三峡水库汛期洪水分期是水库汛期水位动态控制的前提条件。将宜昌站还原后的洪水系列作为三峡水库洪水分期的计算依据,选取天气成因以及多种数理统计分析方法,分析了宜昌站汛期洪水分期特征。结果表明:多种方法分期结果相差不大,考虑工程调度需求,将宜昌站汛期分为3期:5月1日至6月20日为前汛期;6月21日至9月10日为主汛期;9月11日至10月31日为后汛期。根据洪水分期特征,计算了三峡水库前汛期和后汛期分期设计洪水。研究成果可为三峡水库进一步合理利用洪水资源以及发挥综合效益提供技术支撑。

The flood periodization of the Three Gorges Reservoir is the precondition for the dynamic control of the reservoir s water level during the flood season.The flood series reduced by the measured flood at Yichang Station was used as the calculation basis for the flood periodization of the three Gorges Reservoir.The weather causes and various mathematical statistical analysis methods were used to analyze the flood periodization characteristics of Yichang Station during the flood season.The results showed that the results of various periodization methods were not much different.Considering the demand of engineering scheduling,the flood season of Yichang station was divided into three periods:the pre-flood season from May 1 to June 20,the main flood season from June 21 to September 10,and the late flood season from September 11 to October 31.According to the characteristics of flood periodization,the designed floods of the Three Gorges Reservoir in the pre-flood season and the late flood season were calculated.The research results can provide technical support for the further rational utilization of flood resources and comprehensive benefits of the Three Gorges Reservoir.