Economic and Environmental Geology (자원환경지질)
- Volume 33 Issue 5
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- Pages.417-424
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- 2000
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- 1225-7281(pISSN)
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- 2288-7962(eISSN)
Application of SP and Pole-pole Array Electrical Resistivity Surveys to the Seawater Leakage Problem of the Embankment
방조제 누수지점 탐지를 위한 SP및 단극배열 전기비저항탐사의 적용
Abstract
We applied SP monitoring and resistivity surveys using the pole-pole electrode array to seawater leakage problems in the Youngsan estuary dam and the Eoeun embankment to estimate and detect the zone of seawater leakage. The embankment is generally affected by tidal variation and has low resistivity characteristics due to the high saturation of seawater. For this reason, SP monitoring and the pole-pole array resistivity surveys, which are relatively more effective to the conductive media, were carried out to delineate the leakage zones of sea water through the embankment. We checked out electrical conductivity (EC) and temperature variations along the inner part of Youngsan estuary dam to detect the zone of seawater leakage and found that the measured EC value agreed to that of seawater in the leakage zone and the temperature was lower than that of the vicinity of leakage zone. SP monitoring results were coincided with tidal variations at each embankment. At the leakage zones in the Youngsan estuary dam and the Eoeun embankment, SP anomalies are in the range of -60~-85 mV and -20~-50 mV, respectively, and true resistivity values obtained by 2-D inversion are 3~15 ohm-m and below 0.3 ohm-m, respectively. Both SP monitoring and the pole-pole array resistivity method are found to be quite effective for investigation of seawater leakage zones in the embankment.
Keywords
- leakage problems;
- pole-pole array resistivity surveys;
- SP monitoring;
- tidal variation;
- electrical conductivity
- 누수지점;
- 단극배열 전기비저항탐사;
- SP모니터링;
- 유동전위;
- 조석변화;