Acta Scientiarum Naturalium Universitatis Sunyatseni

   

Design rainstorm hydrograph in Zhuhai city based on asymmetrical GH-copula

CHEN Zishen1,2, LI Honghao3   

  1. 1. Xinhua College of Sun Yat-sen University,Guangzhou 510520,China;
    2. School of Geography and Planning,Sun Yat-sen University,Guangzhou 510275,China;
    3. Zhuhai Public Meteorological Service Center,Zhuhai 519000,China
  • Received:2020-02-03 Published:2020-07-22

Abstract:

The maximum 1-hour rainfall (rain peak), maximum 6-hour rainfall and maximum 24-hour rainfall recorded at Zhuhai meteorological stations from 1961 to 2018 are taken as case study. The two typical rainstorm hydrographs of rainfall joint distribution with three time periods were constructed based on the asymmetric Archimedean Gumbel-Hougaard(GH) copula. The main conclusions were reached as follows: The designed rainstorm value in Zhuhai city calculated by using the combined distribution of three time periods of rainfall is larger than the designed rainstorm value of the combined distribution with two time periods and that of a single time period; The ‘OR’ joint return periods of rainfall in combined distribution of three time periods is more suitable for dealing with the flood risk of Zhuhai city. The designed typical rainstorm hydrographs amplified by the same frequency can be selected as the reference for the design of drainage and flood prevention engineering.

Key words: asymmetrical GH-copula, design rainstorm hydrograph, ’OR’return period

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