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| | Abstract | | In our country, surroundings of a river are highly developed, and there are many human activities and important buildings around a river. Therefore, maintenance of the levee which had the enough strength to protect them from a flood and an earthquake impaction is important. For the levee maintenance, we should evaluate inside the levee body and its surroundings and, investigations on ground water are quire essential among all investigation menus. As geophysical surveys have non-invasive and non-destructive natures, they are desirable for levee surveys. Ground Penetrating Radar, GPR, survey has characteristics such as highest resolution and highest survey speed among all geophysical survey methods. In this paper, we describe three-dimensional GPR survey results around a river levee. Data acquisitions are carried out at around Ara River, Yoshimi-town, Saitama. After flooding caused by a typhoon of last autumn, change of levee shape was observed behind the levee at some spots around Ara River. Therefore, it comes to be necessary to investigate ground water distributions around Ara River and inside its river levee. As a result, we obtained a highly precise subsurface image. In addition, we can understand subsurface visually and interactive interpretations are now possible on a precise three-dimensional image. |
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