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目前我们较广泛地采用的设计洪水放大方法,不外是“按一个倍比放大”和“按同频率放大”两种。现简述如下: 一个倍比放大,就是首先决定一个设计时段,例如90天。则以频率计算得的某一保证率的90天的总量与典型年90天的最大总量之比,遍乘典型年这90天的流量过程,即得这一保证率的设计洪水过程线。同频率放大时,设计洪水过程线不限于一个放大倍比,而要使得放大后的过程线的各个时段的总量均与按各个时段计算出来的同一个频率的总量相等。例如保证率P=0.1％的设计洪水过程线的最大三天总量即与保证率P=0.1%的三天总量相等,最大五天总量与保证率P=0.1%的五天总量相
At present, we are more widely used to design flood amplification methods, nothing more than “by a factor of” and “by the same frequency amplification” two. Is summarized as follows: A multiplier, is to first determine a design period, for example, 90 days. The ratio of the 90-day total of a certain guaranteed rate of frequency to the largest total of 90-day typical years is multiplied by the typical 90-day flow rate of the typical year, ie, the design flood course with this guaranteed rate . At the same frequency amplification, the design flood process line is not limited to one magnification, but the total amount of each period of the enlarged process line should be equal to the total amount of the same frequency calculated in each period. For example, the maximum three-day total of the design flood process line with the P = 0.1% is the total of the five-day total with the P = 0.1% guarantee and the five-day total with the maximum five-day total and the P = 0.1% phase