A Comparison Between Conventional and M5 Model Tree Methods for Converting Pan Evaporation to Reference Evapotranspiration for Semi-Arid Region

2013 ◽  
Vol 27 (14) ◽  
pp. 4815-4826 ◽  
Author(s):  
Ali Rahimikhoob ◽  
Maryam Asadi ◽  
Mahmood Mashal
Keyword(s):  
Arid Region ◽  
Reference Evapotranspiration ◽  
Pan Evaporation ◽  
M5 Model Tree ◽  
Model Tree ◽  
Tree Methods ◽  
Semi Arid Region ◽  
Semi Arid ◽  
M5 Model

scholarly journals Global comparison of 20 reference evapotranspiration equations in a semi-arid region of Iran

2018 ◽  
Vol 50 (1) ◽  
pp. 282-300 ◽  
Author(s):  
Hadi Farzanpour ◽  
Jalal Shiri ◽  
Ali Ashraf Sadraddini ◽  
Slavisa Trajkovic
Keyword(s):  
Arid Region ◽  
Reference Evapotranspiration ◽  
Meteorological Data ◽  
Irrigation Scheduling ◽  
Climatic Conditions ◽  
Accurate Estimation ◽  
Management Scenarios ◽  
Global Comparison ◽  
Semi Arid Region ◽  
Semi Arid

Abstract Accurate estimation of reference evapotranspiration (ETo) is a major task in hydrology, water resources management, irrigation scheduling and determining crop water requirement. There are many empirical equations suggested by numerous references in literature for calculating ETo using meteorological data. Some such equations have been developed for specific climatic conditions while some have been applied universally. The potential for usage of these equations depends on the availability of necessary meteorological parameters for calculating ETo in different climate conditions. The focus of the present study was a global cross-comparison of 20 ETo estimation equations using daily meteorological records of 10 weather stations (covering a period of 12 years) in a semi-arid region of Iran. Two data management scenarios, namely local and cross-station scenarios, were adopted for calibrating the applied equations against the standard FAO56-PM model. The obtained results revealed that the cross-station calibration might be a good alternative for local calibration of the ETo models when proper similar stations are used for feeding the calibration matrix.

scholarly journals Modelling the daily reference evapotranspiration in semi-arid region of South India: A case study comparing ANFIS and empirical models

2020 ◽  
Author(s):  
Ramiro T. Gonzalez del Cerro ◽  
M.S.P Subathra ◽  
Nallapaneni Manoj Kumar ◽  
Sebastian Verrastro ◽  
S. Thomas George
Keyword(s):  
Arid Region ◽  
South India ◽  
Reference Evapotranspiration ◽  
Empirical Models ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals ÍNDICES HÍDRICOS PARA ÁREAS IRRIGADAS NA REGIÃO DE DESENVOLVIMENTO AGRÍCOLA PETROLINA/JUAZEIRO

Irriga ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 127-135 ◽  
Author(s):  
Antônio Heriberto De Castro Teixeira ◽  
Janice Freitas Leiva ◽  
Gustavo Bayma-Silva ◽  
Edlene Aparecida Monteiro Garçon
Keyword(s):  
Soil Moisture ◽  
Arid Region ◽  
Reference Evapotranspiration ◽  
Development Region ◽  
Irrigated Crops ◽  
Semi Arid Region ◽  
Moisture Conditions ◽  
Agriculture Development ◽  
Semi Arid ◽  
Better Than

   ÍNDICES HÍDRICOS PARA ÁREAS IRRIGADAS NA REGIÃO DE DESENVOLVIMENTO AGRÍCOLA PETROLINA/JUAZEIRO  ANTÔNIO HERIBERTO DE CASTRO TEIXEIRA1; JANICE FREITAS LEIVAS1; GUSTAVO BAYMA-SILVA1 E EDLENE APARECIDA MONTEIRO GARÇON1 ¹Departamento de Geociências, Embrapa Monitoramento por Satélite, Av. Soldado Passarinho, nº 303, Fazenda Jardim Chapadão CEP: 13070-115 - Campinas - SP, [email protected], [email protected], [email protected], [email protected]  1 Resumo Os algoritmos SAFER e o SUREAL foram usados com produtos MODIS na determinação da evapotranspiração atual (ET), sendo usada com dados de precipitação (P) e evapotranspiração de referência (ET0) para aplicação dos índices IH (P/ET) e ETr (ET/ET0), nas análises do balanço hídrico durante o ano de 2015, em áreas irrigadas da região de desenvolvimento agrícola Petrolina/Juazeiro, Nordeste do Brasil. Tanto para Petrolina como para Juazeiro, as maiores taxas da ET, chegando acima de 4,5 mm dia-1, ocorreram em fevereiro, devido ao suprimento hídrico conjunto das águas das chuvas e de irrigação para as plantas. Os valores mais baixos em novembro (ET < 2,2 mm dia-1) coincidiram com o final de ciclo generalizado das culturas agrícolas. Apesar de P na escala anual ter sido maior em Petrolina (230 mm) em 10% quando comparado com Juazeiro, a menor demanda atmosférica do segundo município resultou em um IH ligeiramente superior. Entretanto, as condições de umidade no solo em Petrolina (ETr = 0,70) foram melhores que às de Juazeiro (ETr = 0,61). Os resultados confirmam o potencial dos algoritmos para o monitoramento das condições hídricas das culturas irrigadas no semiárido brasileiro. PALAVRAS-CHAVE: Evapotranspiração, umidade de solo, irrigação.  TEIXEIRA, A. H. de C.; LEIVAS, J. F.; BAYMA-SILVA, G.; GARÇON, E. A. M.WATER INDICES FOR IRRIGATED AREAS IN THE PETROLINA/JUAZEIRO AGRICULTURE DEVELOPMENT REGION   2 ABSTRACT The SAFER and SUREAL algorithms were applied along with MODIS products for determining the actual evapotranspiration (ET), and then used together with precipitation (P) and reference evapotranspiration (ET0) data for application of the WI (P/ET) and ETr (ET/ET0) indices, for water balance analyses during the year 2015, in the irrigated areas of Petrolina/Juazeiro agriculture development region. Both for Petrolina and Juazeiro, the highest ET rates, reaching to above 4.5 mm d-1, took place in February, due to the joint water supply from rainfall and irrigation systems. The lowest indices were observed in November (ET < 2.2 mm d-1), coinciding with the end of the generalized irrigated crop growing cycles. Although P at the annual measurement being 10% higher in Petrolina (230 mm), when compared to Juazeiro, the lower atmospheric demand in the second municipality resulted in an WI slightly higher. However, the soil moisture conditions in Petrolina (ETr = 0.70) were better than those present in Juazeiro (ETr = 0.61). These results state the potential of the algorithms for monitoring the irrigated crops water conditions in the Brazilian semi-arid region. Keywords: Evapotranspiration, soil moisture, irrigation. 

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