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在没有水文观测站的河流上,周期流量推算资料的主要来源是调查与访问当地老居民,这样所得的资料只能是多年平均洪水位及几十年的特殊高水位,而不可能得到逐年的水位记录,因此我们必须利用这些资料来推算周期流量。在推算过程中,首先要决定的是下列三个参变数值,即:Qcp、C_v 和 C_s。Q_(cp)为多年平均洪水流量。这个流量是用历年所有最大每秒流量的总和,除以测水站观测年数而得的。C_v 为河流的变差系数,该系数是多年洪水变化的表征。C_s 为偏差系数,这个数值表明大小流量对于其平均数值分布的不均衡性。这三个数值
In rivers without hydrological stations, the main source of periodic flow projection data is the survey and access to the local residents. The information thus obtained can only be the multi-year average flood level and the special high water level for several decades, but it is impossible to obtain yearly Therefore, we must use these data to calculate the periodic flow. In the process of calculation, the first three parameters to be determined are Qcp, C_v and C_s. Q_ (cp) is the average annual flood flow. This flow rate is calculated by dividing the sum of all the maximum flows per second over the calendar year by the number of observations made by the water meter. C_v is the coefficient of variation of the river, which is a characterization of years of flood changes. C_s is the coefficient of deviation, this value indicates that the size of the flow for its average value distribution of the imbalance. These three values