Correlação entre valores decendiais da evapotranspiração potencial calculados segundo métodos de Penman e de Thornthwaite e dados de evapotranspirômetros, na região de Ribeirão Preto

Correlation between decendial values of potential evapotranspiration calculated by Penman's and Thornthwaite's methods and data of evapotranspi-rometers at Ribeirão Prêto

NOTA

Correlação entre valores decendiais da evapotranspiração potencial calculados segundo métodos de Penman e de Thornthwaite e dados de evapotranspirômetros, na região de Ribeirão Preto^*

Correlation between decendial values of potential evapotranspiration calculated by Penman's and Thornthwaite's methods and data of evapotranspi-rometers at Ribeirão Prêto

A. A. Ortolani; A. Paes de Camargo; N. A. Villa Nova

SUMMARY

Correlations were established between data obtained by "Thornthwaite" type evapotranspirometers on a ten days basis, at Ribeirão Preto (State of

São Paulo, Brazil — Lat. 21°11' S) and the corresponding values estimated by Penman's and Thornthwaite's methods.

The totals of potential evaporatranspiration for 27 decendials were: measured: 898 mm; computed: Penman, 917 mm; Thorntwaite, 816 mm. It can be observed that the latter underestimated by about 9% the potential evapotranspiration of the period. The results obtained by Penman's method were far closer to the measured data, overestimating them by only 2%.

The correlation coefficients between computed and measured data, on a ten day basis, were the following: Penman's, r=0.95** and Thorn-thwaite, r= 0.84**.

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Recebida para publicação em 24 de outubro de 1966.

*

Apresentada à XVII Reunião Anual da S.B.P.C., Blumenau, Santa Catarina, julho de 1966.

Datas de Publicação

• Publicação nesta coleção
  24 Mar 2009
• Data do Fascículo
  1966