主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2021, Vol. 37 ›› Issue (5): 78-85.doi: 10.3969/j.issn.1673-503X.2021.05.012

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Intensity formula and design hyetograph for long-duration storm in Xiong'an New District

Chang-wen YU(),Qi-hui XU,Yi-chang YANG,Gui-dong MA,Xu-xu GAO   

  1. Hebei Climate Centre, Shijiazhuang 050021, China
  • Received:2021-06-18 Online:2021-10-30 Published:2021-11-01

Abstract:

Design rainstorm research is an important foundation for urban drainage and waterlogging prevention engineering construction. The temporal variation characteristics of the number of precipitation and rainstorm days were analyzed based on the precipitation data of meteorological stations in Xiong'an New District from 1981 to 2020. Taking Xiong county as an example, using its minute-level rainfall data, through the annual maximum value method, the theoretical frequency analysis of rainfall data was carried out using P-III curve in order to consider the fitting goodness of long and short duration rainfall data. The parameters of formula were solved by Gauss-Newton method and the long-duration comprehensive storm intensity formula that suitable for 5-1440 min was obtained. On this basis, the design hyetograph for 1440 min in Xiong county was deduced using homogenous frequency analysis method. The results show that multi-year averaged rainfall in Xiong'an New District is 490.4 mm; the number of storm days is 4.4 d; the number of storm days shows an increasing trend from 2000 to 2020, especially for the number of torrential rain days. In recent 10 years, the proportion of the number of torrential rain days to storm days was the largest (20.8%) in the new district, which was nearly 7 times larger than that at the beginning of the 21st century. The obtained long-duration comprehensive storm intensity formula of Xiong county could be used to calculate the design storm of whatever duration (5-1440 min) and whatever recurrence period (2-100 years). The 1440 min' design hyetograph with an interval of 5 min in Xiong county shows a single peak with the peak value is 0.806. Combined the design hyetograph with the obtained long-duration comprehensive storm intensity formula, the designed rain patttern of 1440 min under different specified recurrence period could be deduced.

Key words: Long-duration storm intensity formula, Designed rainstorm pattern, P-III distribution, Homogenous frequency analysis method, Xiong'an New District

CLC Number: