Multivariate statistical analysis of underground gas storage caverns on groundwater chemistry in Korea |
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Authors: | Jeonghoon Lee Kyung‐Seok Ko Jun‐Mo Kim Ho‐Wan Chang |
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Affiliation: | 1. Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, USA;2. School of Earth and Environmental Sciences, Seoul National University, Seoul 151‐742, South Korea;3. Korea Institute of Geoscience and Mineral Resources, Daejeon 305‐350, South Korea |
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Abstract: | An understanding of groundwater flow and chemistry is important to operate underground storage caverns. Groundwater flow is mainly affected by cavern operating conditions. Groundwater chemistry is modified by disinfection activities for removing possible biological clogging and by mixing with cement pore water. It is important to discern these two effects, because wells affected by the disinfection activities may have hydrological connections with water curtains used to inject the disinfectant. However, it is difficult to separate these two effects using graphical methods because of their similar chemical characteristics. Instead, multivariate statistical analysis, such as principal component analysis (PCA) and factor analysis (FA), can be used. Groundwater samples for chemical analysis were obtained from four surveys in 1999–2000. Based on the results from PCA and FA, it appears that there were temporal variations of seepage water into the propane area when the cavern operation fluctuated, but we could not observe such variation in the butane area. These changes may occur mainly at depth, where water flow is slow and water renewal in the cavern surrounding is limited. Copyright © 2008 John Wiley & Sons, Ltd. |
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Keywords: | underground gas storage principal component analysis factor analysis disinfection activity cement pore water temporal variation |
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