COMPARISON OF ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY FAO-PENMAN-MONTEITH AND PENMAN-WRIGHT AND HARGREAVES-SAMANAI METHODS IN TEHRAN

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NIKBAKHT J.; MIRLATIFI S.M.; KAMALI Q.

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Journal: Journal of Agricultural Sciences and Natural Resources Year:2002 | Volume:8 | Issue:4 Page(s): 3-14

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Title

COMPARISON OF ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY FAO-PENMAN-MONTEITH AND PENMAN-WRIGHT AND HARGREAVES-SAMANAI METHODS IN TEHRAN

Author(s)

NIKBAKHT J. | MIRLATIFI S.M. | KAMALI Q. | Issue Writer Certificate

Keywords

REFERENCE EVAPOTRANSPIRATION (ETO)Q2

FAO-PENMAN-MONTEITHQ4

HARGREAVES-SAMANIQ4

PENMAN- WRIGHT METHODQ4

Abstract

Daily estimates reference evapotranspiration were computed by FAO-PENMAN-MONTEITH (FP-M), Penman- Wright (P- W), and HARGREAVES-SAMANI (H-S) methods from the climatological data recorded at Mehrabad Synoptic Weather Station between 1966 to 1998. The daily average ET0 of each month of the year was calculated as the average of the daily ET0 computations of that month. Due to the lake of lysimetric data, the estimates of FP-M were considered as actual values and the performance of the other two equations were compared with ET0 estimates of FP-M method. The daily ET0 and the monthly average ET0 by P-W method were overestimated 13% and 11% respectively. With the same order standard error of estimates were obtained 0.52 and 0.46 mm/day.Similar values for H-S method were underestimated 14% and 12% and SEE values were found 1.11and 0.75 mm/day. In order to increase the accuracy of ET0 estimates, they were compared with ,FP-M estimates using a linear regression equation of the form ET0(actual)=a+b ET0(estimated)and the values of the regression parameter (a and b) was found using the data of 1966-1978. Then, ET0 of the period 1982 to 1998 were adjusted according to the regresion equation with the values of a and b parameters as found. The resulting ET0 estimates were close to the FP-M estimates and the SEE of monthly ET0 estimates of P-W ans H-S methods reduced to 0.18 and 0.37 mm/day.It is concluded that in areas of similar climatic conditions with lake of extensive measured cIimatological parameters. H-S equation can be used for estimating monthly ET0 from long-period historical temperature data.

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APA: Copy

NIKBAKHT, J., MIRLATIFI, S.M., & KAMALI, Q.. (2002). COMPARISON OF ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY FAO-PENMAN-MONTEITH AND PENMAN-WRIGHT AND HARGREAVES-SAMANAI METHODS IN TEHRAN. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 8(4), 3-14. SID. https://sid.ir/paper/9563/en

Vancouver: Copy

NIKBAKHT J., MIRLATIFI S.M., KAMALI Q.. COMPARISON OF ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY FAO-PENMAN-MONTEITH AND PENMAN-WRIGHT AND HARGREAVES-SAMANAI METHODS IN TEHRAN. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2002;8(4):3-14. Available from: https://sid.ir/paper/9563/en

IEEE: Copy

J. NIKBAKHT, S.M. MIRLATIFI, and Q. KAMALI, “COMPARISON OF ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY FAO-PENMAN-MONTEITH AND PENMAN-WRIGHT AND HARGREAVES-SAMANAI METHODS IN TEHRAN,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 8, no. 4, pp. 3–14, 2002, [Online]. Available: https://sid.ir/paper/9563/en

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