A simple model to estimate monthly forest evapotranspiration in Japan from monthly temperature

Hikaru Komatsu, Tomonori Kume, Kyoichi Otsuki

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

The estimation of evapotranspiration (E) in forested areas is required for various practical purposes (e.g. evaluation of drought risks) in Japan. This study developed a model that estimates monthly forest E in Japan with the input of monthly temperature (T). The model is based on the assumptions that E equals the equilibrium evaporation rate (Eeq) and that Eeq is approximated by a function of T. The model formulates E as E (mm month-1) = 3.48 T (°C) + 32.3. The accuracy of the model was examined using monthly E data derived using short-term water balance (WB) and micrometeorological (M) methods for 15 forest sites in Japan. The model estimated monthly E more accurately than did the Thornthwaite and Hamon equations according to regression analysis of the estimated E and E derived using the WB and M methods. Although the model tended to overestimate monthly E, the overestimation could be reduced by considering the effect of precipitation on E. As T data are commonly available all over Japan, the model would be a useful tool to estimate forest E in Japan.

本文言語英語
ページ(範囲)1896-1911
ページ数16
ジャーナルHydrological Processes
24
13
DOI
出版ステータス出版済み - 6 1 2010

All Science Journal Classification (ASJC) codes

  • 水の科学と技術

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