potential evapotranspiration Articles
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Analysis of potential evapotranspiration using 11 modified temperature–based models
The evapotranspiration was estimated using 11 temperature–based models and was compared with the FAO Penman–Monteith model. The results showed that the modified Hargreaves–Samani models estimate the evapotranspiration better than the other models in the most provinces of Iran. However, the values of R² were less than 0.98 for 15 provinces of Iran. Therefore, the models were calibrated and ...
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Spatio-temporal variability of temperature and potential evapotranspiration over India
Worldwide, major changes in the climate are expected due to global warming, which leads to temperature variations. To assess the climate change impact on the hydrological cycle, a spatio-temporal change detection study of potential evapotranspiration (PET) along with maximum and minimum temperatures (Tmax and Tmin) over India have been performed for the second half of the 20th century ...
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Clustering analysis of regional reference evapotranspiration and its components based on climatic variables across northeast China, 1961–2010
Evapotranspiration integrates atmospheric demand and surface conditions. The Penman-Monteith equation was used to calculate annual and seasonal reference evapotranspiration (ET0) and thermodynamic and aerodynamic components (ETrad and ETaero) at 77 stations across northeast China, 1961–2010. The results were: (1) annual ETrad and ETaero had different regional distribution, annual ETrad values ...
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Effect of climate change on potential evapotranspiration: a case study on Gharehsoo sub–basin, Iran
Potential evapotranspiration (ET0) as an important factor in hydrologic cycle has a key role in integrated watershed management practices. Moreover, study of the lack of precipitation with respect to ET0 is one of the main references in management of extreme events. In this study, Gharehsoo sub–basin as a part of Caspian Sea watershed located in Golestan province at Northern Iran is studied to ...
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Potential evapotranspiration change and its attribution in the Qinling Mountains and surrounding area, China, during 1960–2012
Based on the observational data of 47 meteorological stations in the northern and southern regions of the Qinling Mountains (NSQ) during 1960–2012, this paper estimated the potential evapotranspiration (ET0) by using the Penman–Monteith method. Further, a quantitative study was conducted of the ET0 spatial distribution pattern, temporal variation rules, influencing factors and attributions. ...
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Wavelet transform analysis of reference crop evapotranspiration during the growing season in three typical regions of Inner Mongolia, China
Management and scheduling of irrigation water requires consideration of evapotranspiration, one of the most important hydrological variables. This study investigates the variations in the daily potential evapotranspiration (ET0), and its aerodynamic (ETa) and radiometric (ETr) components in three areas (western, central and eastern) of the Inner Mongolia Autonomous Region (IMAR) during the ...
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Tree Canopy Effects on Simulated Water Stress in Southern African Savannas
A coupled energy and water balance model is used to simulate the effects of large tree canopies on soil moisture and water stress across a series of sites spanning a regional moisture gradient in southern Africa. The model tracks evapotranspiration from five components of the land surface at each site—the tree canopy, the grass under and between tree canopies, and the bare soil under and between ...
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Assessing the sensitivity of SWAT physical parameters to potential evapotranspiration estimation methods over a coastal plain watershed in the southeastern United States
One of the key inputs of a hydrologic budget is the potential evapotranspiration (PET), which represents the hypothetical upper limit to evapotranspirative water losses. However, different mathematical formulas proposed for defining PET often produce inconsistent results and challenge hydrological estimation. The objective of this study is to investigate the effects of the Priestley–Taylor ...
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Water deficit effect on the relationship between temperature during the seed fill period and soybean seed oil and protein concentrations
Since most soybean [Glycine max (L.) Merr.] seed is processed into meal and oil, there is a growing concern about environmental effects on soybean seed composition. The aim of this work was to investigate how water deficit affects the well-known relationship of soybean seed oil and protein concentrations with temperature and, alternatively, with solar radiation during seed fill. We analyzed oil ...
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A method of calibration and variance analysis with respect to the Penman-Monteith equation for the Turc, Hargreaves and Abtew potential evapotranspiration models
Introduction: The full ASCE/FAO-56 Penman-Monteith evapotranspiration (PM-ET) equation and crop coefficients are often employed for irrigation scheduling of open-field crops. To obtain PM-ET derived water-use figures requires access to full weather station datasets, which includes radiation, air temperature, wind-speed, and relative humidity measurements. Over the years there have been many ...
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The effect of rigid scheduling on productivity and water-use of potatoes (Solanum tuberosum L.) grown under small-scale irrigation
This paper evaluates the results of a study highlighting the effect of rigid scheduling on crop water use and soil water extraction patterns, crop coefficients, crop response functions and water-use efficiency (WUE). The cumulative Penman potential evapotranspiration (Etp) at the end of the season reached around 400 mm and the total depth of water applied between planting and harvest through ...
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