Error Analysis on Evapotranspiration Estimation of Paddy Rice Field by Penman Monteith Model

doi:10.3969/j.issn.1000-6362.2015.01.004

Abstract

Abstract: Based on the features of the paddy rice field environment and PenmanMonteith model，the error contribution of soil heat flux，storage heat term，surface resistance and aerodynamic resistance to the estimation of evapotranspiration were analyzed theoretically by differential error method.Then the modified PenmanMonteith model was obtained with considering soil and water heat storage，atmospheric stability correction，and its simulated values were compared with those of the original model.The results showed that in accuracy of 5% net radiation，10% soil heat flux，100% heat storage，20% surface resistance and 20% aerodynamic resistance led to 26.8%，5.36%，53.6 %，11.11% and 3.17% the error of evapotranspiration estimation according to normal ordering relationships，respectively.Heat storage of 10cm depth soil layer and water layer of paddy rice field decreased with the development of 4 growing stages including transplantingjointing stage，jointingtasseling stage，tasselingfilling stage and maturing stage.The effects of heat storage of water layer on the estimation of evapotranspiratin in the former 2 stages were greater than that of latter 2 stages.Compared with the values simulated by original model，the evapotranspiration simulated values improved 0.04-0.073，0.02-0.11mm·h-1 only with soil heat storage correction and 0.006-0.038，0.003-0.015mm·h-1 only with water heat storage correction during 7 ：00-14：00.Only through aerodynamic resistance correction，the simulating error decreased 0.00064，0.0134，0.0055，0.0024mm·h-1 on average during 4 growing stages.The results could provide scientific reference so as to improve the accuracy of simulating paddy field evapotranspiration．

Key words: Paddy rice field evapotranspiration, Penman Monteith model, Heat storage, Resistance, Atmospheric stability

LIU Bin，HU Ji chao，ZHAO Xiu lan，ZHANG Xue song，ZHANG Fu cun. Error Analysis on Evapotranspiration Estimation of Paddy Rice Field by Penman Monteith Model[J]. Chinese Journal of Agrometeorology, 2015, 36(01): 24-32.

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