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| | Abstract | | Electrical resistance survey, ground penetrating radar (GPR) survey and elastic wave exploration were performed in irrigation tank embankment submerged in sea water due to the tsunami. The objective of this study was to grasp the effect on desalinization of paddy field and irrigation tank embankment using geophysical exploration. The distributions of electric conductivity were obtained from the results of electrical resistance survey. The distribution of relative reflection strength of electromagnetic waves was obtained from the result of GPR survey. The distributions of relative strength of seismic reflection were obtained from the results of elastic wave exploration using geophone. As a result, it is found that the salinity concentration in the observed embankment decreases with the time passage. It is inferred that the area of high salinity concentration is above the water table. Even if one year or more passes from the tsunami, the area where the salinity concentration is high exists locally. |
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