Actual Evapotranspiration for Sugarcane Based on Bowen Ratio-Energy Balance and Soil Water Balance Models with Optimized Crop Coefficients

Suelen Costa Faria Martins, Marcos Alex Santos, Gustavo Bastos Lyra (), José Leonaldo Souza, Guilherme Bastos Lyra, Iêdo Teodoro, Fábio Freitas Ferreira, Ricardo Araújo Ferreira Júnior, Alexsandro Claudio Santos Almeida and Renan Cantalice Souza
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Suelen Costa Faria Martins: Institute of Technology, Federal Rural University of Rio de Janeiro
Marcos Alex Santos: Federal University of Alagoas
Gustavo Bastos Lyra: Forest Institute, Federal Rural University of Rio de Janeiro
José Leonaldo Souza: Federal University of Alagoas
Guilherme Bastos Lyra: Federal University of Alagoas
Iêdo Teodoro: Federal University of Alagoas
Fábio Freitas Ferreira: Institute of Humanity and Health, Fluminense Federal University
Ricardo Araújo Ferreira Júnior: Federal University of Alagoas
Alexsandro Claudio Santos Almeida: Federal University of Alagoas
Renan Cantalice Souza: Federal University of Alagoas

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2022, vol. 36, issue 12, No 7, 4557-4574

Abstract: Abstract Evapotranspiration is an important parameter to evaluate soil water deficit and water use efficiency, especially in locations with irregularly distributed precipitation. The aim of this study was to assess the daily actual evapotranspiration (ETa) estimated by the Thornthwaite and Mather soil water balance adapted for crops (ThM) and by the dual Kc method with the crop coefficients optimized from inverse modeling and by the adjustment suggested in the FAO-56 bulletin. The models were optimized and evaluated with actual evapotranspiration determined by the Bowen ratio – energy balance method (ETβ) for sugarcane at full canopy closure grown in Alagoas state, northeastern Brazil. The objective function of the inverse problem was defined in terms of ETβ and ETa estimated by the ThM or dual Kc method by optimizing the single crop coefficient (Kc) and the basal crop coefficient Kcb, respectively. Optimized Kc (1.05) and Kcb (1.03) were lower than those adjusted by the Kc FAO56 method (Kc = 1.25 or Kcb = 1.20), with optimized Kc slightly higher than the Kc obtained experimentally (1.01 ± 0.08). ETa estimated by the ThM and dual Kc method with optimized crop coefficients had similar high precision (r2 > 0.79) and accuracy (dm > 0.93 and RMSE

Keywords: Thornthwaite and Mather; Dual Kc; Inverse modeling (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11269-022-03263-5

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