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発表 水域における浅部物理探査(その3):渇水期における比較計測

作成年度 2019 年度
論文名 水域における浅部物理探査(その3):渇水期における比較計測
論文名(和訳)
論文副題
発表会 第140回物理探査学会学術講演会
誌名 第140回物理探査学会学術講演会
巻・号・回 140 
発表年月日 2019/06/03 ~ 2019/06/05
所属研究室/機関名 著者名(英名)
土木研究所稲崎 富士
土木研究所小河原 敬徳
土木研究所小林 貴幸
抄録
The authors have proposed a novel method to apply integrated near surface geophysical investigation in water covered areas such as river streams, dam reservoirs, and harbors. The major components of the method are under-water hybrid surface wave method and under-water DC resistivity method. To certify the method and to examine its field measurement parameters, we conducted a preliminary study in a river stream. As a result, 2D Vs and resistivity structure was clearly delineated up to 40 m below the river bottom. Regretfully, reference information available to interpret the study result was very limited. We therefore conducted comparative measurements on the same line deployed on a river bed but under the dry condition. Capacitively coupled resistivity survey using OhmMapper, hybrid surface wave surveys including walk-around surface wave method, and GPR were adopted to obtain the reference data. As a result of the comparative measurements, 2D Vs structure along the survey line was successfully delineated up to 40 m deep, and resistivity structure of the surficial 10 m in depths. Both structures were basically similar to those obtained by the preliminary study or water-covered condition except for the superficial zone about 2 m in depths or above the groundwater level. Apparent differences and their possible interpretation is discussed in this paper.
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