Data/hora: 05/06/2024 18:48:24

Provedor de dados: | 70
País: | Brazil
Título: | Estimation of the potential evapotranspiration by a simplified penman method
Autores: | Villa Nova,Nilson A.; Miranda,Jarbas H. de; Pereira,André B.; Silva,Késia O. da.
Data: | 2006-12-01
Ano: | 2006
Palavras-chave: | Crop water use; Bowen ratio; Energy balance.
Resumo: | The numerous methods for calculating the potential or reference evapotranspiration (ETo or ETP) almost always do for a 24-hour period, including values of climatic parameters throughout the nocturnal period (daily averages). These results have a nil effect on transpiration, constituting the main evaporative demand process in cases of localized irrigation. The aim of the current manuscript was to come up with a model rather simplified for the calculation of diurnal daily ETo. It deals with an alternative approach based on the theoretical background of the Penman method without having to consider values of aerodynamic conductance of latent and sensible heat fluxes, as well as data of wind speed and relative humidity of the air. The comparison between the diurnal values of ETo measured in weighing lysimeters with elevated precision and estimated by either the Penman-Monteith method or the Simplified-Penman approach in study also points out a fairly consistent agreement among the potential demand calculation criteria. The Simplified-Penman approach was a feasible alternative to estimate ETo under the local meteorological conditions of two field trials. With the availability of the input data required, such a method could be employed in other climatic regions for scheduling irrigation.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162006000300007
Editor: | Associação Brasileira de Engenharia Agrícola
Relação: | 10.1590/S0100-69162006000300007
Formato: | text/html
Fonte: | Engenharia Agrícola  v.26 n.3 2006
Fonte: | info:eu-repo/semantics/openAccess