棉花滩水库分期设计洪水研究及地

结合汀江流域雨洪变化规律，主要用均值变点分析方法对棉花滩水库进行分期确定了分期时段，并用多种方法对比研究。根据流域资料用流域面积内差计算出坝址分期设计洪水，并与全年最大值设计洪水进行对比分析，引进组合频率概念推导两者之间的量化关系。为了考虑水库建成后调洪对下游设计断面工程防洪后果的影响，拟定不同的地区组成方案进行分析，计算相应的分期设计洪水。

Analysis of Stage Design Flood and Its Regional Composition in Mianhuatan Reservoir

According to the rainwater variation principle in the Ting River basin, the paper studies the flood stages in Mianhuatan Reservoir with the method of mean point-change analysis, and compared with many other methods. Based on observation data in the basin, the stage design flood at the dam site is calculated by area interpolation method, compared with the maximal value of design flood, and the quantitative relations between them are also worked out by introducing the conception of combined frequency. The different regional combination scenarios are decided, and the corresponding stage design flood are calculated through considering the effect of flood regulation in the reservoir on the flood control downstream.