Evaluation of FAO’s WaPOR product in estimating the reference evapotranspiration for stream flow modeling

Geshnigani, Fatemeh Sohrabi; Mirabbasi, Rasoul; Golabi, Mona

doi:10.1007/s00704-021-03534-y

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…Also, in different studies done around the Urmia Lake basin, it has been concluded that the FAO Penman–Monteith is the most accurate with the lysimetric data (Alihouri, 2019). Geshnigani et al (2021) also used the results of the FAO Penman–Monteith equation to evaluate the RET of the FWP. Therefore, in the next step, the RET of the FWP was evaluated by estimating the FAO Penman–Monteith equation (FPM).…”

Section: Resultsmentioning

confidence: 99%

“…The correlation coefficient [ R (−)] indicates the trend of estimates, and the values close to unity indicated better performance (Geshnigani et al, 2021). The root mean square error [RMSE (L T −1 )] represents the difference between the estimated and actual value; it is always positive.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, lysimeters can be used for measuring evapotranspiration. Nevertheless, constructing lysimeters and meteorological stations is not possible everywhere and can be costly (Geshnigani et al, 2021; Okechukwu, 2020). Therefore, evapotranspiration is measured on a point basis and in a limited number; since most studies are performed on a regional scale, it is necessary to generalize this information from measuring stations to the whole region (Galehban et al, 2021; Veysi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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The challenge of reference evapotranspiration between the WaPOR data set and geostatistical methods

Barideh

Veysi

Ebrahimipak

et al. 2022

Irrigation and Drainage

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This study aimed evaluating the ability of the FAO's WaPOR Product (FWP) to estimate reference evapotranspiration (RET) based on lysimetric data and RET equations and compare its accuracy with geostatistical methods in the Lake Urmia basin. Lysimetric RET was collected at two stations for 4 years. RET equations were then evaluated using the lysimetric data; the best equation was determined. The RET data obtained from FWP were evaluated at daily, monthly and annual scales using the results of the selected equation for the years 2010–2020. Finally, the accuracy of FWP in the spatial estimation of RET was compared with geostatistical methods. The results show that the FAO Penman–Monteith (FPM) equation was more accurate at both stations. Therefore, the results of the FPM were used to evaluate the reference evapotranspiration of FWP. The average nRMSE of the FWP to daily, monthly and annual data was 31, 25 and 16%, respectively. In general, 15% overestimation was observed in the FWP. Comparison of the FWP with geostatistical methods showed that the highest and lowest accuracy was observed in the experimental kriging method and FWP with an nRMSE value of 4.6 and 18%, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%