SEGJ Technical Conference

Application of Integrated Geophysical Techniques to Vulnerability Assessment of Levee (Part6): Comparisons with the results of electrical resistivity method and surface-wave method and levee formation properties.

Abstract SEGJ Levee Consortium reported on five volumes in the former SEGJ Conference, and proposed that the ratio resistivity distribution and the elastic wave velocity of the bank body were continuously measured, and the crossing technique of each physical property for plotting them be effective as a physical inquiry that extracted the abnormality part in the river embankment here. We acquired the resistivity distribution and the elastic wave velocity at the cutting slope where the restoration for the infiltration damage from the embankment during the downpour of the summer of 2006. Furthermore the grain size test was conducted for the soil samples obtained at the cutting slope of the bank body by the PWRI.The previously reports proposed the crossing plotting of the electric resistivity and the elastic wave velocity of the bank body and extracting the high resistivity and the low velocity area as a needed attention part (gravel bed where the tightening loosened). We verified the validity of the extraction technique of the attention part by the crossing plot by comparing the soil grain size examination result with the crossing plot chart.