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Derivation of Design Rainfall and Disaggregation Process of Areas with Limited Data and Extreme Climatic Variability

  • Vassiliki Terezinha Galvao Boulomytis
  • Antonio Carlos Zuffo
  • Monzur Alam Imteaz
Research paper

Abstract

In a sustainable urbanisation process, the infrastructure has to be designed taking into consideration the hydrological behaviour of the respective catchment. It is mandatory to predict the climatic events accurately to understand the hydrological impacts of urban developments. It is very challenging for hydrologists to model extreme events when there are limited data available. The current study proposed a methodology to calculate the design rainfalls in the coastal region of Sao Paulo, Brazil. The gamma-function distribution used the annual maximum daily rainfalls in a probabilistic approach. The achieved 24-h-design rainfalls were compared to the results from other intensity–duration–frequency equations in different time-series. The rainfall disaggregation used regional and national conversion ratios. The fluctuation of the annual maxima revealed that the study area was affected by the Noah and Joseph erratic processes. Subsequently, the detected extreme event time-series were also used for the derivation of the 24-h-design rainfalls. The outcomes of the study showed that the gamma-function distribution provides reliable results, enhanced by the use of representative disaggregation ratios and proper time-series.

Keywords

Design rainfalls IDF equation Annual maxima Gamma distribution Rainfall disaggregation Noah and Joseph processes 

Notes

Acknowledgements

We gratefully acknowledge UNICAMP and the Brazilian National Council for the Improvement of Higher Education (CAPES) for the study support, and the Australian Government for the Research Training Program (RTP) Fees Offset Scholarship at Swinburne University of Technology.

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Copyright information

© University of Tehran 2018

Authors and Affiliations

  • Vassiliki Terezinha Galvao Boulomytis
    • 1
    • 2
  • Antonio Carlos Zuffo
    • 2
  • Monzur Alam Imteaz
    • 1
  1. 1.Department of Civil and Construction EngineeringSwinburne University of TechnologyHawthornAustralia
  2. 2.School of Civil Engineering, Architecture and Urban DesignState University of CampinasCampinasBrazil

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