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浅地層における降雨浸透量推定に関する現場透水係数の評価

Estimating of in-situ hydraulic conductivity related with evaluating of rainfall infiltration behavior in shallow ground

小松 満*; 西垣 誠*; 瀬尾 昭治*; 田岸 宏孝*; 竹延 千良*; 岸 敦康

Komatsu, Mitsuru*; Nishigaki, Makoto*; Seno, Shoji*; Tagishi, Hirotaka*; Takenobu, Kazuyoshi*; Kishi, Atsuyasu

大局的な地下水流動を定量的に評価する際、上部境界条件としての降雨浸透量の算定が必要であるが、一般的に知られる水収支法では計測項目が多く不確実性を含んでいる。そこで本研究では、対象領域における土中水分量の変化量から直接的に降雨浸透量を算定する手法に着目し、不飽和地盤における原位置透水試験結果を用いる方法について確認した。さらに現場透水試験結果の妥当性について室内試験により検証することで計測値に与える不確実性を推定した。

Infiltration rate at the ground surface is one of the essential boundary conditions for a quantitative evaluation of groundwater flow. Conventional method for quantifying infiltration rate based on the water budget, however, includes significant uncertainties resulting from different types of quantities to be measured. In this study, focusing on a method where the infiltration rate is estimated directly from temporal changes in soil water contents in the region of interest, the measurement data was confirmed based on the ${it in-situ}$ unsaturated hydraulic tests. Then, the reliability of the measurement was verified by comparing the ${it in-situ}$ data to the laboratory test results and uncertainties associated with the ${it in-situ}$ measurements were quantified.

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