Seeking to contribute with the management of water resources in Itaipu Binacional reservoir region, this research aimed characterize dynamics evapotranspiration and evaluate performance different mathematical methods, which determine reference (ETo) from air temperature values. Fifteen municipalities were analyzed. After obtaining data series, ETo was estimated using six methods: Camargo (C), H...

Solar radiation, which is used in hydrological modeling, agricultural, solar energy systems, and climatological studies, the most important element of reaching earth. The present study compared, performance two empirical equations -Angstrom Hargreaves-Samani equations- and, three machine learning models -Artificial Neural Networks (ANN), Support Vector Machine (SVM), Long Short-Term Memory (LST...

The aim of this study was to analyze the water demand in banana, papaya and coconut crops grown irrigation districts Araras Norte Baixo Acaraú, located State Ceará. A historical meteorological series regions where from are used. Precipitation, maximum minimum temperatures, relative humidity data were obtained these series. From acquired precipitation data, frequency intensity dry rainy years ar...

So far, various methods have been presented for determining reference crop evapotranspiration in different parts of the world. The most popular and prestigious of them are probably the combined methods of Penman family, modified Blany-Criddle, Hargreaves - Samani and thornthwaite. Due to lack of lysimeter data in many parts of Iran, presenting an equation according to the regional condition wit...

Abstract The Penman-Monteith equation is recommended for the estimation of reference evapotranspiration (ETo). However, it requires meteorological data that are commonly unavailable. Thus, this study evaluates artificial neural network (ANN), multivariate adaptive regression splines (MARS), and original calibrated Hargreaves-Samani (HS) temperature (PMT) equations daily ETo using temperature. T...

Estimar a radiação solar é importante para vários segmentos da sociedade como agricultura, meteorologia e geração de energia elétrica (sistemas fotovoltaicos). Este artigo tem objetivo estimar Radiação Solar Global em quatro cidades do estado Pará - Brasil, por meio modelos estimativas, Hargreaves-Samani Bristow-Campbell, usando dados meteorológicos fornecidos pelas Estações Meteorológicas Auto...

Para um bom manejo de irrigação dos cultivos agrícolas a determinação da evapotranspiração é indispensável. Pensando nisso objetivou-se com este estudo comparar e avaliar o desempenho estimativa referência (Eto) pelos métodos Hargreaves-Samani, Makkink, Budyko, Turc, Jensen-Haise, Linacre, Kharrufa, Radiação FAO24 em relação ao método padrão Penman-Monteith/FAO no período seco chuvoso, Imperatr...