Evapotranspiração Horária X Diária Utilizando Penmanmonteith Para O Polo De Desenvolvimento Petrolinape/Juazeiro-Ba

Abstract

RESUMOO conhecimento da evapotranspiração é de fundamental importância para a estimativa da necessidade de irrigação. Entre os diversos métodos existentes para a realização do cálculo, o método de Penman-Monteith é considerado como o que mais se ajusta a diversas localidades, podendo calcular a evapotranspiração de referência tanto utilizando dados diários quanto horários. O objetivo deste trabalho foi avaliar as estimativas de evapotranspiração de referência (ETo) pelo método de Penman-Monteith em períodos diários e a soma horária de evapotranspiração para o Polo de Desenvolvimento Petrolina-PE/Juazeiro-BA, parametrizado no boletim 56 da FAO. Para a análise dos dados das estações foram calculados índices estatísticos de exatidão, ou seja, índice de concordância, a fim de se analisar o desempenho dos dados. Além disso, foram analisados coeficientes de regressão os respectivos testes t. Os dados diários e horários coletados das diversas estações meteorológicas apresentaram uma boa concordância. Os resultados de correlação foram todos significativos, assim podendo ser aplicado as duas metodologias para o manejo da irrigação.Palavras-chave: Agrometeorologia, Semiárido, Dados Meteorológicos. EVAPOTRANSPIRATION HOURLY X DAILY USING PENMAN-MONTEITH DEVELOPMENT OF POLO PETROLINA-PE / JUAZEIRO-BA ABSTRACTKnowledge of evapotranspiration is crucial for estimating the need for irrigation. Among the various existing methods for performing the calculation, the Penman-Monteith method is considered that best suit different locations and can calculate the reference evapotranspiration using both daily data and schedules. The objective of this study was to evaluate the estimates of reference evapotranspiration (ETo) by Penman-Monteith method in periods daily and hourly

Comparison of meteorological data, related to reference evapotranspiration, from conventional and automatic stations in the Sertão and Agreste regions of Pernambuco, Brazil

“…These changes in Vv values may be associated with the observations made by [25] in the same region, which, in a study of the hourly ETo calculation, verified the interference of the wind speed during short periods of time. Thus, there are different ways of responding to the different rates of variation of Vv for CWSs when compared to AWSs.…”

Hourly and Daily Reference Evapotranspiration with ASCE-PM Model for Paraná State, Brazil

“…The average seasonal trend for ETo 24h and ETo d in Paraná State were also similar and close, with the Cfa "d" index equal to 0.97 for spring and summer; and Cfb "d" index equal to 0.99 in the spring and 0.98 in the summer. Lopes & Leal (2016) associating ETo d vs ETo 24h for semiarid climate obtained an agreement "d" index ranging from 0.98 to 0.99. In the present study, lower "d" indexes were observed in the autumn and winter periods for Cfa climate.…”

“…Dhungel et al (2019) studying evapotranspiration in a BSh (dry semi-arid) climate obtained mean ETo d values in a lysimeter ranging from 0 to 12 mm day −1 . Lopes & Leal (2016) observed that the ETo d and ETo 24h methodologies have different results when taking months or seasons into consideration. When working with a reduced number of data, such as a few months, there is no possibility to analyze ETo considering the changes in meteorological variables throughout the year.…”

“…The periodicity choice depends on the precision and data availability for use in the models. In areas where there are large changes in wind speed, cloudiness or dew point throughout the day, the calculation of evapotranspiration in hourly periodicity is more accurate (Noia et al, 2014;Lopes & Leal, 2016). The models most recommended and used in the literature for this purpose are Penman-Monteith FAO N°56 (Allen et al, 1998) and Penman-Monteith ASCE (ASCE-EWRI, 2005).…”