| 講演要旨(和文) | | 筆者ら2014年以来、多チャンネル表面波探査（MASW）とリニアアレイ微動探査（LAMS）を組み合わせたハイブリッド表面波探査法を開発している。この手法は河川堤防の堤体およびその基礎地盤のＳ波速度構造を可視化し、土構造物の安全性評価に役立てられている。しかしながら、河川や湖沼、海浜に隣接する土構造物の調査では、水域でも調査が求められることがあった。そこで、筆者らはOcean Bottom Cables (OBC)とOcean Bottom Recorders (OBR)を使用して、河川水路でハイブリッド表面波探査を実施し、その水域での適用性を調べた。調査の結果、MASWもLAMSも水底において実施可能であり、水域においてもハイブリッド表面波探査が適用できることを確認した。筆者らはこの調査法を水底表面波探査（UWHSW）と名付けた。 |
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| | 講演要旨(英文) | | The Authors have developed Hybrid Surface-Wave Survey Method which is combination of MASW (Multi-channel Analysis of Surface-waves) and LAMS (Linear Array Microtremor Survey) since 2014. This survey method has been applied to visualize shear-wave velocity sections both of levee bodys and of their foundations. However, the Authors have recognized that studying sub-strata at water-covered areas is also required to assess vulnerability of earth structures in/around rivers, lakes and the sea. Thus, the Authors conducted a preliminary study of Hybrid Surface-Wave Method in a river using both Ocean Bottom Cables (OBC) and Ocean Bottom Recorders (OBR) to collect practical data and to evaluate performance of the survey method. As a result of the study, it was verified that MASW can be performed at the under-water. It was also revealed that LAMS conducted with both OBC and OBR can be applicable at water-covered areas as well. Consequently, Hybrid Surface Wave Method can be performed at water-covered areas. We call this survey technique the Under-Water Hybrid Surface-Wave Survey Method (UWHSW). |
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