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| | Abstract | | Integrated geophysical survey was conducted along the levee of the lower stream of Arakawa River for the safety assessment of the levee system. The adopted geophysical methods involved the surface wave survey, capacitively-coupled resistivity measurement, and Land Streamer S-wave reflection survey. Two 3-km long lines were set on the top of the right side levee and a road on the high water bed along the levee. The integrated survey revealed the levee body at the site was mainly composed of fine-grained, or low resistivity and low S-wave velocity materials. In addition, the survey delineated a 100-m wide small flexure which deformed a reflection event at 25 m in depth up to 2 m. |
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