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| | Abstract | | We conducted a fundamental experiment for understanding of piping in a levee. For this purpose, a new model levee was built at a PWRI tsukuba site. This consisted of a 0.7 m high sand layer as a levee foundation, 4m by 4m sand pit as a water poured area and 2 m high embankment. In this experiment, resistivity and S-wave tomography survey were conducted to characterize water behavior in the vadose zone. We poured water into the sand pit. A total of 13000 L water was poured in 200 minutes. As a result, water leakage was observed in 220 minutes at opposite of the sand pit. In addition, resistivity monitoring could clearly image water movement process. And S-wave tomography could delineate the area of decreasing in S-wave velocity due to increasing of pore water pressure. |
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