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A precipitacao pluvial e um dos elementos meteorologicos que apresenta maior variabilidade tanto em quantidade quanto em distribuicao mensal e anual de uma regiao para outra. O estudo do comportamento temporal da distribuicao e probabilidade das chuvas constitui um fator de grande relevância para a compreensao dos sistemas que determinam os regimes hidricos de regioes semiaridas. Nesse contexto, objetivou-se com este estudo, caracterizar a precipitacao pluvial para o municipio de Barreiras-BA. Foi utilizada uma serie historica de precipitacao pluvial, referente ao periodo de 1959 a 2008 (49 anos). Os dados foram provenientes da rede de estacoes convencionais do Instituto Nacional de Meteorologia (INMET). Na distribuicao empirica as probabilidades com que serao igualadas ou superadas as precipitacoes pluviais foram calculadas pelo metodo Kimball. Esperam-se chuvas acima de 100 mm nos meses de novembro e dezembro com probabilidade superior a 80%. Para a precipitacao total anual ha uma maior probabilidade de precipitacoes inferiores a 1000 mm (probabilidade > 50%). O Estudo aponta a ocorrencia de precipitacoes superiores a media historica a cada 4 anos. Nao foi evidenciado indicios de decrescimo de chuvas para Barreiras-BA nos ultimos 49 anos. Normal 0 false false false PT-BR X-NONE X-NONE st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:PT-BR; mso-fareast-language:PT-BR;} A B S T R A C T Rainfall is one of the weather parameters that has the highest variability in both quantity and distribution of monthly and annual from one region to another. The study of the temporal distribution and probability of rainfall is a factor of great importance for understanding the systems that determine water regimes in semi-arid regions. In this context, the objective of this study was to characterize the rainfall for Barreiras, state of Bahia, Brazil. It was used a historical series of rainfall for the period 1959 to 2008 (49 years). The data were derived from the conventional network stations from the National Institute of Meteorology (INMET). In the probabilities empirical distribution that will be equaled or exceeded the rainfall were calculated by the method Kimball. More than 100 mm rainfall during the months of November and December are expected with a probability greater than 80%. For the total annual rainfall there is a larger probability of precipitations below 1000 mm (probability > 50%) This study shows the occurrence of precipitation above the historical average every four years. No evidence was shown to decrease rainfall for Barreiras in recent 49 years. Keywords: historical series, rain, return period.

revista brasileira de geografia física

Probabilidade e análise decadal da precipitação pluvial da cidade de Barreiras-Bahia, Brasil (Probability and analysis of decadal rainfall in the city of Barreiras-Bahia, Brazil)