拡張フォースレストアモデルを用いた北海道十勝地方における土壌凍結深推定の試み

DOI 日本農学文献記事索引 Web Site Web Site 被引用文献2件 参考文献28件

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  • Application of the Extended Force-restore Model to Estimating Soil-frost Depth in the Tokachi District of Hokkaido, Japan

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In the present study, we tested the applicability of the extended force-restore model (eFRM) to estimating soil-frost depth in the Tokachi district where the soil is a type of volcanic ash. The optimal thermal conductivity of the snow (TC-S) in each cold period varied from 0.074 to 0.172 W m-1 K-1, with root-mean-square errors (RMSEs) ranging from 0.020 to 0.039 m. The difference between observed and estimated maximum soil frost depth (SFDmax) was less than 0.03 m. The fixed TC-S through the six cold periods from 2001 to 2007 was optimized as the value of 0.173 W m-1 K-1 with minimum RMSE of 0.043 m. When this optimal value of TC-S was used to estimate SFDmax, the difference between the observed and estimated values was 0.04 m at most, with the exception of 2003-2004 and 2004-2005, when little soil-frost developed. Our results showed that even though we considered the TC-S to be invariant over time, the eFRM was able to estimate soil-frost depth with an accuracy of a few centimeters using only mean daily air temperature and snow depth as inputs.

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  • 農業気象

    農業気象 64 (3), 177-183, 2008

    日本農業気象学会

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