A model-based site selection approach associated with regional frequency analysis for modeling extreme rainfall depths in Minas Gerais state, Southeast Brazil

  • L. C. Assis
  • M. L. Calijuri
  • D. D. Silva
  • E. O. Rocha
  • A. L. T. Fernandes
  • F. F. Silva
Original Paper
  • 49 Downloads

Abstract

Extreme rainfall data are usually scarce due to the low frequency of these events. However, prior knowledge of the precipitation depth and return period of a design event is crucial to water resource management and engineering. This study presents a model-based selection approach associated with regional frequency analysis to examine the lack of maximum daily rainfall data in Brazil. A generalized extreme values (GEV) distribution was hierarchically fitted using a Bayesian approach and data that were collected from rainfall gauge stations. The GEV model parameters were submitted to a model-based cluster analysis, resulting in regions of homogeneous rainfall regimes. Time-series data of the individual rainfall gauges belonging to each identified region were joined into a new dataset, which was divided into calibration and validation sets to estimate new GEV parameters and to evaluate model performance, respectively. The results identified two distinct rainfall regimes in the region: more and less intense rainfall extremes in the southeast and northwest regions, respectively. According to the goodness of fit measures that were used to evaluate the models, the aggregation level of the parameters in clustering influenced their performance.

Keywords

Regional frequency analysis Model-based site selection Extreme daily rainfall Hierarchical Bayesian inference Model-based cluster analysis Return period 

Notes

Acknowledgements

We thank the Foundation for Research Support of the State of Minas Gerais (FAPEMIG) for financial support of our research. The authors also thank the reviewers’ comments and suggestions that tremendously contributed to improve the paper quality. The time-series of daily rainfall data used in this work are freely available online for the public at the Hydrological Information System—HidroWeb (http://hidroweb.ana.gov.br/) of the National Agency of Water (ANA).

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Universidade de Uberaba - UNIUBEUberabaBrazil
  2. 2.Universidade Federal de Viçosa - UFVViçosaBrazil
  3. 3.Fundação Estadual de Meio Ambiente de Minas Gerais - FEAMBelo HorizonteBrazil

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