Effect of Potential Evapotranspiration Estimation Method on Reconnaissance Drought Index (RDI) Calculation

doi:103969/jissn1000-6362201403004

Abstract

Abstract: Based on the observed meteorological data (1963-2012) at five stations represented different types of climate and landscape in the Chinese mainland, the Hargreaves method, Thornthwaite method, Mccloud method and PM method (reference) were used to estimate the potential evapotranspiration (PET) Then, the RDI was calculated at different time scales according to the estimated PET and the difference of RDI at various time scales and locations The applicability of the RDI at different regions in China was discussed The results showed that the Thornthwaite method overestimates the PET and the Hargreaves method underestimates the PET, while the Thornthwaite method and the PM method get the similar results The PET calculated by the four methods respectively followed the same annual patterns, but the inter annual change of PET various significantly The RDI values calculated by the four PET methods displayed almost the same annual pattern at the five stations, which suggest that the four PET calculated methods are suitable for RDI calculation Moreover, the most suitable method is different at the five stations The difference among the RDI values at six months and three months scale calculated by the four PET calculates is little Only the results calculated by Hargreaves at Zhangzhou station is quite different with the other three methods, and the trend is also inconsistent The result suggests that the four PET calculation methods are suitable for the calculation of RDI at middle or short time scale in China mainland, but the most suitable method of each station is different

Key words: Drought, Potential evapotranspiration, Reconnaissance Drought Index, Different time scales, Variance analysis

ZHOU Dan, ZHANG Bo, SHEN Yan jun. Effect of Potential Evapotranspiration Estimation Method on Reconnaissance Drought Index (RDI) Calculation[J]. Chinese Journal of Agrometeorology, 2014, 35(03): 258-267.

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