LIU Huan-bin,QIU Can,WANG Rong.Applicability Analysis of Rainstorm Intensity Formula Establishment by Using Different Periods of Rainfall Data[J].China Water & Wastewater,2020,36(19 19):114.
Applicability Analysis of Rainstorm Intensity Formula Establishment by Using Different Periods of Rainfall Data
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
19 19
Page:
114
Column:
Date of publication:
2020-10-01
- Abstract:
- According to rainfall data (1961-2017) of Jinan meteorological station, rainfall series of 11 durations were constructed by using annual maximum sample selection method. Pearson-Ⅲ type distribution, Gumbel distribution and exponential distribution were used to fit the sample sequence, and the least squares method was used to obtain the parameters. Based on this, rainstorm intensity formulas of rainfall data from four different time periods (1961 to 2017, 1971 to 2017, 1981 to 2017, and 1991 to 2017) were obtained. The average absolute mean square error and relative mean square error of the formula fitted by the Pearson-Ⅲ distribution curve met the requirements of the specification. Among them, the maximum rainfall intensity was obtained from the formula compiled by the rainfall data from 1991 to 2017, which was in line with the rainfall law of Jinan and was more secure. When compiling a rainstorm intensity formula, calculation results of the formula would be different if different rainfall years were selected as samples, and it should not be only depended on long-term rainfall data. The selection method of the data segment should be judged according to the characteristics of the sample, so as to make the design rain storm intensity more reasonable.
Last Update:
2020-10-01