Class “A” Pan coefficients to estimate of daily reference evapotranspiration in transitional Amazon-Cerrado Forest, Brazil

Authors

  • Adilson Pacheco de Souza Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop
  • Frederico Terra de Almeida Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop
  • Kelte Resende Arantes Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop
  • Charles Campoe Martim Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop
  • Jackson Oliveira da Silva Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop

Keywords:

evaporimeters, irrigation management, indicative statistical.

Abstract

This study aimed to evaluate different methodologies to estimates of Class A pan coefficients (Kp) and propose numerical coefficients for simplified estimates of daily reference evapotranspiration (ET0) in different database groupings (annual, seasonal and monthly), at climate conditions of Sinop, Central North of Mato Grosso State, Brazil (in 11°58' S and 55°38'57" W), between 01/08/2010 at 30/06/2013. Were evaluated eight methods of Kp estimates and the correlations were found between estimated ETo by pan Class A and Penman- Monteith FAO 56 (PMF). To evaluate the statistical performance were employed the mean relative error (MBE), root mean square error (RMSE), adjustment index (d), correlation coefficient (r), performance index (c) and position value (Vp). According to the PMF method, the monthly averages of ETo ranged from 3.18±0.49 (June) and 4.83±0.69 (December). However, by methods based on evaporation, higher values of ETo occurred in Winter (August and September) and Spring (October) and the lowest values were in Summer (February). The correlations in annual groupings showed the best estimates, and it is being recommended for this region the Kp corrections by Cuenca (0.7795) and Snyder (0.7517) or corrections by direct evaporation with Kp equal to 0.7585.

Author Biographies

Adilson Pacheco de Souza, Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop

Engenheiro Agrícola, Doutor em Irrigação e Drenagem, Professor Adjunto

Frederico Terra de Almeida, Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop

Engenheiro Civil, Doutor em Produção Vegetal, Professor Associado

Kelte Resende Arantes, Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop

Engenheiro Agrícola, Doutor em Irrigação e Drenagem, Professor Adjunto

Charles Campoe Martim, Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop

Graduando em Engenharia Agrícola e Ambiental, Bolsista PIBIC/CNPq

Jackson Oliveira da Silva, Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Campus de Sinop

Graduando em Agronomia

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Published

2015-05-09

How to Cite

Souza, A. P. de, Almeida, F. T. de, Arantes, K. R., Martim, C. C., & Silva, J. O. da. (2015). Class “A” Pan coefficients to estimate of daily reference evapotranspiration in transitional Amazon-Cerrado Forest, Brazil. Scientia Plena, 11(5). Retrieved from https://scientiaplena.org.br/sp/article/view/2383

Issue

Vol. 11 No. 5 (2015): May/Maio 2015

Section

Articles

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