| 摘要 |
PROBLEM TO BE SOLVED: To enhance precision and to make survey work efficient, when surveying oil contamination in a soil. SOLUTION: The oil contamination in the soil is surveyed by a resistivity method using a survey instrument 10 having a large number of rod-like electrodes D<SB>1</SB>, D<SB>2</SB>, D<SB>3</SB>, etc. along a measuring line T. The rod-like electrodes D<SB>1</SB>, D<SB>2</SB>, D<SB>3</SB>, etc. are inserted into the ground, two of the electrodes are connected electrically to a transmitter 6 to be constituted as current electrodes, and two of the electrodes positioned in an inner side of the current electrodes are connected to a receiver 7 to be constituted as voltage electrodes. A current is made to flow from the pair of current electrodes into the ground, a potential between the voltage electrodes is measured to find apparent resistivity, and resistivity distribution information is obtained based on the apparent resistivity. An oil contaminated area is estimated based on the acquired resistivity distribution information. COPYRIGHT: (C)2004,JPO&NCIPI
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