INVESTIGATING EFFECTS OF AERODYNAMIC AND CANOPY RESISTANCES ON ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY PENMAN MONTEITH EQUATION

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NEMATPOUR O.; MIRLATIFI S.M.; MOHAMMADI KOUROSH

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Journal: Iranian Journal of Irrigation and Drainage Year:2010 | Volume:4 | Issue:1 Page(s): 156-166

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Title

INVESTIGATING EFFECTS OF AERODYNAMIC AND CANOPY RESISTANCES ON ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY PENMAN MONTEITH EQUATION

Author(s)

NEMATPOUR O. | MIRLATIFI S.M. | MOHAMMADI KOUROSH | Issue Writer Certificate

Keywords

REFERENCE EVAPOTRANSPIRATIONQ2

CANOPY RESISTANCEQ2

AERODYNAMIC RESISTANCEQ3

ATMOSPHERIC STABILITYCONDITIONQ3

Abstract

Effects of various calculation methods of aerodynamic and CANOPY RESISTANCEs on estimates of REFERENCE EVAPOTRANSPIRATION (ETo) by Penman-Monteith (PM) equation for 70 days of lysimeter- weather data was evaluated. CANOPY RESISTANCE (rc) was computed according to PM, FAO PM, ASCE PM and Todorovic (1999) methods and as a function of net radiation. AERODYNAMIC RESISTANCE (ra) was computed and modified based on atmospheric stratification according to eight methods including PM, FAO PM, Thom (1975), Verma et al. (1976), Hatfield et al. (1983), Mahrt and Ek (1984), Chouhury et al. (1986) and Choudhury and Monteith (1988). Daily ETo was computed using daily climatological data and from the sum of hourly computed ETo values. Considering the combinations of various methodologies for computation of rc and ra in PM equation, hourly ETo was computed from 40 methods and compared with lysimeter data. Three methods namely PM, FAO PM, and Todorovic (1999) were used to compute daily ETo. Computing rc according to ASCE method gave the highest r2 value for calculation of daily ETo as the sum of hourly values. Todorovic(1999) method gave r2 value close to the ASCE method and was ranked as second method based on r2 values. But, Todorovic (1999) method when compared with ASCE method improved slope and theY-intercept of the regression line. ETo estimates were improved when ra was corrected for stability by Mahrt and Ek (1984) and Chouhury et al. (1986) methods as compared to other stability correction methods. In regard to daily methods, Todorovic (1999) method had r2, slope and Y- intercept values equal to 0.92, 0.74 and 0.21 respectively and had the best performance. Todorovic (1999) method when compared with PM and ASCE methods improved r2, slope and Y- intercept of the regression line. The performances of sum of hourly methods were generally better than computations from average daily data.

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APA: Copy

NEMATPOUR, O., MIRLATIFI, S.M., & MOHAMMADI, KOUROSH. (2010). INVESTIGATING EFFECTS OF AERODYNAMIC AND CANOPY RESISTANCES ON ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY PENMAN MONTEITH EQUATION. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, 4(1), 156-166. SID. https://sid.ir/paper/131786/en

Vancouver: Copy

NEMATPOUR O., MIRLATIFI S.M., MOHAMMADI KOUROSH. INVESTIGATING EFFECTS OF AERODYNAMIC AND CANOPY RESISTANCES ON ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY PENMAN MONTEITH EQUATION. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE[Internet]. 2010;4(1):156-166. Available from: https://sid.ir/paper/131786/en

IEEE: Copy

O. NEMATPOUR, S.M. MIRLATIFI, and KOUROSH MOHAMMADI, “INVESTIGATING EFFECTS OF AERODYNAMIC AND CANOPY RESISTANCES ON ESTIMATES OF REFERENCE EVAPOTRANSPIRATION BY PENMAN MONTEITH EQUATION,” IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, vol. 4, no. 1, pp. 156–166, 2010, [Online]. Available: https://sid.ir/paper/131786/en

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