Comparison of the Inverse Analysis Method with the Bowen's Ratio Method and the Eddy Covariance Method for Estimation of Evapotranspiration

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  • 蒸発散推定のための逆解析法とボーエン比法及び渦相関法との比較
  • 蒸発散推定のための逆解析法とボーエン比法及び渦相関法との比較 : 異常値を処理した場合の事例
  • ジョウハッサン スイテイ ノ タメ ノ ギャクカイセキホウ ト ボーエンヒホウ オヨビ ウズ ソウカンホウ ト ノ ヒカク : イジョウチ オ ショリ シタ バアイ ノ ジレイ
  • ― Case study on the abnormal criteria applied ―
  • ― 異常値を処理した場合の事例 ―

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Abstract

<p>This paper described the feature of lE (Latent heat flux) and H (Sensible heat flux) derived from the IABM (Inverse analysis of Bowen Ratio method), BO (Bowen ratio) method and Eddy covariance method and compared the feature among them. Above three methods are applied by the abnormal criteria that α×ABS(Rn-G)>ABS(H) and ABS(lE) as proposed by the previous research. ① The hourly changes of lE and H of the three methods are very well consistent with each other during crop growing season (α=1.0 in the IABM). ② Comparison of three set of daily data of the lE between the two methods among the IABM, BO and Eddy covariance methods shows they are very well consistent with each other. ③ Comparison of monthly change for the lE among the three methods describe very well their consistency with each other in case of α＝1.0. ④ The ratio of the abnormal data is remarkably many in the BO method than the Eddy covariance method and IABM. ⑤Monthly evapotranspiration required for water resources and irrigation planning can be estimated by the three methods sufficiently.</p>

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