关键词: 关键词：暴雨, 暴雨强度公式, 雨型设计；吉林市

Abstract: Based on minutely precipitation data from 1961 to 2017 in Jilin City, rainstorm data were sampled using the annual maximum method and the annual multi-sampling method, and frequency distribution curves were fitted by P-Ⅲ distribution, exponential distribution and Gumbel distribution, respectively. The rainstorm intensity formulas were solved by least square method, and the fitting methods were optimized according to the principle of the minimum errors. The new rainstorm intensity formula selected was compared with the rainstorm intensity formula used currently. The design rainstorm pattern was studied by Chicago method on these basis. The results show that the formula fitting precision was higher using the annual maximum method and P-Ⅲ distribution. The rainfall intensities calculated by the new formula in durations from 5 to 20 minutes under each return period were smaller than those calculated by using the old rainstorm intensity formula or basically equivalent to those. The rainfall intensities calculated by the new formula in durations from 30 to 180 minutes under each return period were mainly lager than those calculated by the old formula. In the same return period, the rainfall intensity change rate was getting larger with the extension of rainfall duration. The comprehensive coefficient of rainfall peak position was 0.389. All the design rainstorm patterns were the single peak in durations from 30 to 180 minutes, and the rainfall peak intensities were similar. All the rainfall peak positions were located before half of the rainfall duration. The accumulation precipitation presented the same variation characteristics with the design rainstorm pattern.

Key words: Key words: rainstorm, rainstorm intensity formula, design rainstorm pattern, Jilin City