长江中游洪水调度研究(Ⅱ):整体防洪设计洪水分析

Analysis of Flood Damage Reduction System in the Middle Yangtze River(Ⅱ):Regional Synthetic Flood

区域设计洪水是评价防洪工程体系整体效果的主要依据,文中首先探讨了地区组成法、洪泛区组合法等经验方法的优缺点,并结合长江中游螺山以上的实际情况,分析计算了该区域不同标准的设计洪水。其结果显示,典型年法、洪泛区组合法、同频率组成法具有不同的数学、物理背景,几种方法分别是从偏于冒险、偏于安全等角度选取洪水组合方案的不同提法;按照不同方法分别放大1954年、1995年、1996年、1998年型洪水,基本能够涵盖长江中游各种遭遇类型的洪水组合。

Synthetic flood hydrographs are baseline for flood reduction system assessment from a watershed perspective. Some conceptual methodologies used to develop synthetic flood hydrographs are examined and a detailed synthetic flood analysis about the middle Yangtze River upper from Luoshan is performed. The conclusions show that the destructive floods of 1954, 1995, 1996, and 1998 can be used to develop a comprehensive synthetic flood hydrographs, which covers all the possibility of flood process composition.