汛期相当暴雨日数与总降水量的定量关系

The Quantitative Relation between the Equivalent Torrential Rain Day and the Total Rainfall at the Flood Period

北京近百年汛期（６～８月）相当暴雨日数与汛期总降水量相关系数高达０．９７，京津冀地区３０年汛期区域平均相当暴雨日数与区域平均降水量相关系数亦达０．９４。通过点聚图和回归方程来表征两者的线性关系。汛期相当暴雨日数估算汛期总降水量的误差约１０％，即估算精度达９０％。这种估算方法可供业务使用。

The correlational coefficient between the number of the equivalent torrential rain day and the total rainfall at June￣August of this century in Beijing is 0.97. The correlational coefficient between the regional average number of the equivalent torrential rain day and the regional average total rainfall is 0.94. The linear correlation between the number of the equivalent torrential rain day and the total rainfall is given by the regression equation and the scatter diagram. The root mean square error of the total rainfall calculated by the regression equation is near 10 percent. The method of the total rainfall calculated by the number of the equivalent torrential rain day can be applied to the operational use.