Sensitivity Analysis of Reference Evapotranspiration (ETO) Models for Irrigation Requirement of Crops and Impact of Irrigation on Climate Changes in Semi-arid Region of India

2017 ◽  
Vol 11 (6) ◽  
pp. 1-16
Author(s):  
R Singandhupe
Keyword(s):  
Sensitivity Analysis ◽  
Arid Region ◽  
Climate Changes ◽  
Reference Evapotranspiration ◽  
Irrigation Requirement ◽  
Semi Arid Region ◽  
Semi Arid

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. 

scholarly journals Usefulness of class A Pan coefficient models for computation of reference evapotranspiration for a semi-arid region

MAUSAM ◽  
2021 ◽  
Vol 65 (4) ◽  
pp. 521-528
Author(s):  
PK SINGH ◽  
SK PATEL ◽  
P JAYSWAL ◽  
SS CHINCHORKAR
Keyword(s):  
Arid Region ◽  
Reference Evapotranspiration ◽  
Accurate Determination ◽  
Climatic Conditions ◽  
Gujarat State ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Statistical Criteria ◽  
Agricultural Organization

The reliability of estimates of reference evapotranspiration (ET0) using pan evaporation (Epan) depends on the accurate determination of pan coefficients (Kpan). Six ET0 models were evaluated for their usefulness using 33-year climatological dataset of a semi-arid region of the Gujarat state of India. The equations compared include Cuenca (1989), Allen and Pruitt (1991), Snyder (1992), Modified Snyder (Grismer et al., 2002), Orang (1998), and Pereira et al. (1995). The ET0 data, calculated using daily Kpan values from these equations, were compared to the Food and Agricultural Organization (FAO)-Penman-Monteith (FAO56-PM) method as a reference. Based on the visual comparison as well as from the statistical criteria, ET0 values computed using Modified Snyder and Orang model have very close agreement with the FAO56-PM method for daily, monthly, and annual estimates as compared to other approaches. The sequential performances of the explored models was found as: Modified Snyder (Eqn. 5) > Orang (Eqn. 6) > Cuenca Eqn. (2) > Allen & Pruitt (Eqn. 3) > Snyder (Eqn. 4) > Pereira et al. (Eqn. 7) model. Therefore, the Modified Snyder model (Grismer et al., 2002) could be recommended as the best model for ET0 computations under these prevailing climatic conditions for a semi arid region.

Sign in / Sign up

Export Citation Format

Share Document