Disaggregation coefficients for daily maxima based on simple scaling invariance

Código

V-END_II-EBHE0229

Autores

Tomás Antonio Quezado Duval, Larissa Zaira Rafael Rolim, Carlos Hennrique Ribeiro Lima, Dirceu Silveira Reis Junior

Tema

14 - Eventos e sistemas meteorológicos extremos;

Resumo

This study explores the simple scale invariance properties in annual maximum rainfall intensities to develop disaggregation coefficients for daily rainfall which can be derived at a regional scale and offer confidence interval estimates. Through a cross-validation framework, we evaluate regional disaggregation coefficients from simple scaling in the state of Rio Grande do Sul, Brazil, and compare them to coefficients that are often employed in the country when disaggregating daily rainfall quantiles into subdaily ones in statistical inference. Estimated conventional IDF curves show that the subdaily quantiles disaggregated with regional simple scaling coefficients are closer to the observed frequencies at a validation site than known coefficients used in Brazil. Results obtained highlight the potential scale invariance has as a physically consistent and promising alternative for estimating subdaily rainfall extremes.