Hargreaves and Other Reduced-Set Methods for Calculating Evapotranspiration

Shahidian, Shakib; Serralheiro, Ricardo; Serrano, J.; Teixeira, J. L.; Haie, Naim; Santos, Francisco L.

doi:10.5772/18059

Cited by 50 publications

(50 citation statements)

References 42 publications

(25 reference statements)

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“…The evapotranspiration values needed for the RDI calculations were estimated applying the FAO PenmanMonteith methodology (Allen et al 1998). This equation has been increasingly gaining acceptance and is used throughout the world for reference evapotranspiration estimations (Shahidian et al 2012). The method requires the measurement of several climatic variables such as temperature, relative humidity, solar radiation and wind speed, which are available for this research.…”

Section: Predicting Equationmentioning

confidence: 99%

“…Still, there are shortages related to its failure to detect drought conditions estimated not by a shortage of precipitation (P) but by a higher than normal aerial evaporative requirement, which is challenging (Tsakiris and Vangelis 2005;Cook et al 2014). Therefore, recent drought trend studies (Shahidian et al 2012;Vicente-Serrano et al 2015) and drought scenarios under potential CC projections (Cook et al 2014) depended on drought indices that take into account P and the aerial evaporative requirement. Tigkas et al (2015) introduced a brief overview of the theoretical basis of the reconnaissance drought index (RDI) together with some practical applications with a specialised software package called drought indices calculator (DrinC).…”

Section: Introductionmentioning

confidence: 99%

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Temporal Hydrologic Alterations Coupled with Climate Variability and Drought for Transboundary River Basins

Mohammed

Scholz

Zounemat‐Kermani

2017

Water Resour Manage

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Climate change (CC) and drought episode impacts linked with anthropogenic pressure have become an increasing concern for policy makers and water resources managers. The current research presents a comprehensive methodology but simple approach for predicting the annual streamflow alteration based on drought indices and hydrological alteration indicators. This has been achieved depending on the evaluation of drought severity and CC impacts during the human intervention periods to separate the influence of climatic abnormality and measure the hydrologic deviations as a result of streamflow regulation configurations. As a representative case study, the Lesser Zab River Basin in northern Iraq has been chosen. In order to analyse the natural flow regime, 34 hydrological years of streamflow prior to the main dam construction were assessed. The Indicators of Hydrologic Alteration (IHA) method has been applied to quantify the hydrological alterations of various flow characteristics. In addition, an easy approach for hydrological drought prediction in relatively small basins grounded on meteorological parameters during the early months of the hydrological year has been presented. The prediction was accomplished by implementing the one-dimensional drought examination and the reconnaissance drought index (RDI) for evaluating the severity of meteorological drought. The proposed methodology is founded on linear regression relations connecting the RDI of 3, 6, and 12 months and the streamflow drought index (SDI). The results are critical for circumstances where an early exploration of meteorological drought is obtainable. Outcomes assist water resources Water Resour Manage

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Section: Predicting Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temporal Hydrologic Alterations Coupled with Climate Variability and Drought for Transboundary River Basins

Mohammed

Scholz

Zounemat‐Kermani

2017

Water Resour Manage

View full text Add to dashboard Cite

show abstract

“…5) did not return, as expected, a significant trend in the ETo for the considered future periods. The term (T max -T min ) is used in the HS equation to account for the effects of humidity and cloudiness in the estimation of ETo (Shahidian et al, 2012;Samani and Pessarakli, 1986). Although the HS ETo results are coherent with the climate input datasets representing each CCS, under the climate change analysis context, the HS equation's inherent susceptibility to thermal amplitude in the estimation of ETo may give rise to concerns about this method's reliability in simulating ETo in future periods, requiring further calibration procedures.…”

Section: Climate Trends From Generated Future Climate Scenariosmentioning

confidence: 99%

Climate change impacts on rainfed agriculture in the Guadiana river basin (Portugal)

Valverde

Carvalho

Serralheiro

et al. 2015

Agricultural Water Management

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a b s t r a c tIn this study, the crop yield response of rainfed crops to climate change was evaluated focusing on the most representative crops in the Guadiana river basin. The quantification of crop yields was performed using a simple soil water balance model framework. The herbaceous crop yields were evaluated with the ISAREG model, implementing a water balance approach combined with the Stewart method. A similar water balance approach was used to estimate the yields for the most representative permanent rainfed woody crops in the region using an alternative spreadsheet-based model, but implementing a more detailed water stress evaluation through the crop cycles. Yields were simulated for two future periods and (2041-2070) using, as climate inputs, temperature and precipitation series, reflecting a combination of five climate change scenarios (CCS) created using the ensemble-delta technique applied to CMIP3 climate projections datasets to represent different alternative climate change bracketing conditions for rainfall and air temperature. The results showed that comparatively with the reference period climate rainfed crop yields will decrease in future period 1 (2011-2040) and reach even higher losses in future period 2 (2041-2070). Within the herbaceous crops, sunflower and winter wheat were the most susceptible to yield losses under climate change, reaching estimated maximum losses for future period 2 of respectively 18.5% and 13.6%, followed by natural grown pastures with 11.5%. For woody crops, maximum estimated yields losses were considerably higher for almond (27.2%) than grapevine (5.4%) and olive (14.9%).

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“…The Hargreaves method is also a temperature-based method that is usually used to determine reference evapotranspiration especially for areas that lack many meteorological data (Shahidian et al, 2012;Subburayan et al, 2011). The Hargreaves reference evapotranspiration (ETo-Hr), is thus determined as (Hargreaves, 1994):…”

Section: Hargreaves Methodsmentioning

confidence: 99%

“…The Blaney-Criddle equation is simple and a temperature-based method (Shahidian et al, 2012) that is used to estimate reference evapotranspiration. The Blanney-Criddle reference evapotranspiration, ETo-BC, (mm day -1 ) is thus determined as (FAO, 1986): (4) where Tmean is the mean daily temperature (°C); p is mean daily percentage of annual daytime hours.…”

Section: Blaney-criddle Methodsmentioning

confidence: 99%

Comparison of five different methods in estimating reference evapotranspiration in Cape Coast, Ghana

Owusu-Sekyere¹,

Ampofo²,

Asamoah³

2017

Afr. J. Agric. Res.

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Hargreaves and Other Reduced-Set Methods for Calculating Evapotranspiration

Cited by 50 publications

References 42 publications

Temporal Hydrologic Alterations Coupled with Climate Variability and Drought for Transboundary River Basins

Temporal Hydrologic Alterations Coupled with Climate Variability and Drought for Transboundary River Basins

Climate change impacts on rainfed agriculture in the Guadiana river basin (Portugal)

Comparison of five different methods in estimating reference evapotranspiration in Cape Coast, Ghana

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