| 講演要旨(和文) | | シラス台地におけるローム層での浸透を把握するために涵養強度の異なる2種類の地下水涵養試験に対して比抵抗モニタリングを行った.涵養開始前の比抵抗分布を初期値とした涵養開始後の比抵抗変化率分布を差トモグラフィー解析により求めた.スプリンクラーを用いた涵養では,湛水による涵養では確認が困難であったローム層での比抵抗の変化が確認された.また,ローム層では比抵抗変化が確認されない部分の下層で比抵抗の変化が確認され,選択流の存在の可能性が示唆された.これらの結果より,スプリンクラーを用いた涵養に対して比抵抗モニタリングを行うことで,シラス台地におけるローム層での比抵抗変化をある程度把握できる可能性が示された. |
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| | 講演要旨(英文) | | Resistivity monitoring of two groundwater recharge tests in a pyroclastic flow plateau were conducted to examine a method for understanding groundwater flow. The two-dimensional distributions of resistivity change ratio were obtained from 2-D constrained non-linear differential tomography of apparent resistivity data. At the groundwater recharge test of low intensity by sprinklers the resistivity change was confirmed in loam layer, whereas at the groundwater recharge test of high intensity by filled water was not. The possibility of partial water flow in loam layer was pointed out because the resistivity change was confirmed under the part in which the resistivity change was not confirmed. These results indicated the possibility of understanding more detailed ground water flow of loam layer by the recharge test of low intensity. |
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