砂丘砂ソルガム圃場におけるバルク輸送係数と蒸発効率の推定

DOI 日本農学文献記事索引 Web Site Web Site 被引用文献7件 参考文献11件

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  • Estimation of Bulk Transfer Coefficient and Surface Moisture Availability on a Sorghum Field in Sand Dune.
  • サキュウ サソルガム ホジョウ ニ オケル バルク ユソウ ケイスウ ト ジョ

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The bulk transfer method combined with the heat balance equation of the surface requires the bulk transfer coefficient for sensible heat flux CHU and the surface moisture availability β (evapotranspiration efficiency) to evaluate the surface temperature Ts, sensible heat flux H and latent heat flux lE, respectively. This paper examines relations between these coefficients and various factors (soil moisture content, solar radiation).<br>Meteorological observations on a sorghum field in Tottori sand dune were carried out for 6-28 August, 1994. Significant results of the observations are the followings:<br>(1) The value of bulk transfer coefficient varied with the atmospheric stability.<br>(2) The value of β increased with increasing solar radiation, and tended to a constant value (β=0.35) when the solar radiation exceeded about 600Wm-2.<br>(3) The value of β increased according to the soil moisture content.<br>Observations of Ts, H and lE were compared with the simulations with the single source model (Kondo and Watanabe, 1992). This model simulates well the observed values of the daily mean of Ts, H and lE within an error of about±20Wm-2, ±20Wm-2 and ±1.1°C, respectively.

収録刊行物

  • 農業気象

    農業気象 53 (2), 131-140, 1997

    日本農業気象学会

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