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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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Estimating the reference evapotranspiration is an important factor to consider in irrigation system design and agricultural water use. However, there is a limitation in using the FAO Penman-Monteith (FAO P-M) equation, which requires various meteorological data. The purpose of this study is to compare three reference evapotranspiration (ETo) equations in the case of meteorological data missing for 11 study weather stations. Firstly, the FAO P-M equation is used for reference potential evapotranspiration estimation with the actual solar radiation data Rn and the actual vapor pressure ea. Then, in the case of Rn, and ea are missed, the reference evapotranspirations applying FAO P-M, Priestley-Taylor (P-T), Hargreaves (HG) equation were calculated using other meteorological factors. Secondly, MAE, RMSE, R2 were calculated to compare ETo relationship from the ETo equations. From the results, ETo with Hargreaves equation in coastal areas and the Priestley-Taylor equation in the inland areas showed relatively high correlation with FAO P-M when ea data is missed. In the case of Rn data is missed or two weather data, e a, and Rn data are all missed, R2 value in Priestley-Taylor equation was highest in coastal areas, and R2 values in Hargreaves equation were the high values for 7 inland areas. The results of sensitivity analysis showed that net radiation was the most sensitive for P-T and HG equation, and for FAO P-M, the most sensitive factor was net radiation and relative humidity, air temperature and wind speed were follows. Therefore, in considering of the accessibility to the coast, the types of the missing wether data, and the correlation and the magnitude of error, the reference evapotranspiration equations would be selected in sense of different conditions.
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참고문헌 (16)
참고문헌 신청
Alkaeed, O / 2006 / Comparison of several reference evapotranspiration methods for Itoshima Peninsula area, Fukuoka, Japan / Memoirs of the Faculty of Engineering 66(1):1~14
Allen, R. G / 2005 / Prediction accuracy for projectwide evapotranspiration using crop coefficients and reference evapotranspiration / Journal of irrigation and drainage engineering 131(1):24~36
Allen, R. G / 1998 / Crop evapotranspiration: guidelines for computing crop requirements. No.56. Irrigation and Drainage / Food and Agriculture Organization of the United Nations
Richard G. Allen / 2006 / A recommendation on standardized surface resistance for hourly calculation of reference ETo by the FAO56 Penman-Monteith method / Agricultural Water Management 81(1-2):1~22
Amatya, D. M / 1995 / Comparison of methods for estimating REF-ET / Journal of Irrigation and Drainage Engineering 121(6):427~435
Allen, R. G / 2005 / Prediction accuracy for projectwide evapotranspiration using crop coefficients and reference evapotranspiration / Journal of irrigation and drainage engineering 131(1):24~36
Allen, R. G / 1998 / Crop evapotranspiration: guidelines for computing crop requirements. No.56. Irrigation and Drainage / Food and Agriculture Organization of the United Nations
Richard G. Allen / 2006 / A recommendation on standardized surface resistance for hourly calculation of reference ETo by the FAO56 Penman-Monteith method / Agricultural Water Management 81(1-2):1~22
Amatya, D. M / 1995 / Comparison of methods for estimating REF-ET / Journal of Irrigation and Drainage Engineering 121(6):427~435
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