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| | Abstract | | Ground-penetrating radar (GPR) can detect the distribution of volumetric water content in the ground. However, the level of water table in normal soil structures including many reflectors as gravels under the road is difficult to be measured by using GPR. We applied time-lapse GPR surveys in the Rokugo alluvial fan where keeps high levels of ground water near the toe and also have wide fluctuations according to the season. The reflection events from the water table are difficult to detect on the simple survey sections of GPR but results of velocity analysis and subtract sections between two seasons can indicate the similar depth of water table observed on a spring-fed pond and in a well. |
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