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Modeling precipitation of short duration by means of the modified Bartlett-Lewis rectangular pulse model

The objective of this work was to evaluate the mathematical modeling of rainfall of duration less than one hour using the modified Bartlett-Lewis model with six parameters. The data used were for the period October 1980 to December 2007, from recording rain gauges (pluviographs) at the meteorologica...

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Published in:Revista brasileira de meteorologia 2011-09, Vol.26 (3), p.461-472
Main Authors: Back, Álvaro José, Uggioni, Edison, Vieira, Hamilton Justino
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description The objective of this work was to evaluate the mathematical modeling of rainfall of duration less than one hour using the modified Bartlett-Lewis model with six parameters. The data used were for the period October 1980 to December 2007, from recording rain gauges (pluviographs) at the meteorological station of Epagri, Urussanga, south of Santa Catarina (latitude 28.31° S, longitude 48.19 ° W). Based on simulations of series with 100 years of data it can be concluded that: the adjustment of the parameters of the modified Bartlett-Lewis model enables the simulation of rain at intervals as small as 5 minutes of duration, preserving the statistical properties of precipitation over various intervals of aggregation in time. In general there was a tendency toward overestimation of the probability of dry periods and underestimation of the covariance for intervals of 24 hours, especially in summer. The total annual rainfall simulated for all time intervals examined remains within the confidence interval of 95%. Este trabalho teve como objetivo avaliar a modelagem matemática da precipitação pluviométrica de duração inferior a uma hora por meio do modelo de Bartlett-Lewis modificado com seis parâmetros. Foi utilizada a série de dados pluviográficos do período de outubro de 1980 a dezembro de 2007 da estação meteorológica da Epagri, Urussanga, Sul de Santa Catarina (latitude 28,31º S, longitude 48,19º W). Com base nas simulações de séries com 100 anos de dados pode-se concluir que: o ajuste dos parâmetros do modelo de Bartlett-Lewis modificado possibilita a simulação de chuvas com intervalos de duração de até 5 minutos preservando as propriedades estatísticas da precipitação em vários níveis de agregação temporal. De forma geral observou-se a tendência de superestimativa da probabilidade dos períodos serem secos e subestimativa da covariância para intervalos de 24 horas, principalmente no verão e que os totais anuais de chuva simulada para todos os intervalos de duração analisados permanecem dentro do intervalo de confiança de 95%.
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title Modeling precipitation of short duration by means of the modified Bartlett-Lewis rectangular pulse model
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