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Fresh Water Injection Test to Mitigate Seawater Intrusion and Geophysical Monitoring in Coastal Area  

Park, Kwon-Gyu (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Shin, Je-Hyun (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Hwang, Se-Ho (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Park, In-Hwa (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Geophysics and Geophysical Exploration / v.10, no.4, 2007 , pp. 353-360 More about this Journal
Abstract
We practiced fresh water injection test to identify its applibility as a method of seawater intrusion mitigation technique, and monitored the change of borehole fluid conductivity and the behavior of injected fresh water using borehole multichannel electrical conductivity monitoring and well-logging, and DC resistivity and SP monitoring at the surface. Well-logging and multichannel EC monitoring showed the decrease of fluid conductivity due to fresh water injection. We note that such an injection effect lasts more than several month which means the applibility of fresh water injection as a seawater intrusion control technique. Although SP monitoring did not show meaningful results because of weather condition during monitoring and the defects of electrodes due to long operation time, DC resistivity monitoring showed its effectiveness and applicability as a monitoring and assessment techniques of injection test by means of imaging the behavior and the front of fresh water body in terms of the increase of resistivity with reasonable resolution. In conclusion, we note that geophysical techniques can be an effective method of monitoring and evaluation of fresh water injection test, and expect that fresh water injection may be an practical method for the mitigation of seawater intrusion when applied with optimal design of injection well distribution and injection rate based on geophysical evaluation.
Keywords
seawater intrusion; fresh water injection; well-logging; multichannel electrical conductivity monitoring; DC resistivity monitoring;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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