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http://dx.doi.org/10.9720/kseg.2022.4.559

Groundwater and Stream Water Acidification and Mixing with Seawater, and Origin of Liquefaction-Expelled Water in a Tertiary Formation in the Pohang Area  

Jeong, Chan Ho (Department of Construction Safety Engineering, Daejeon University)
Ou, Song Min (Department of Construction Safety Engineering, Daejeon University)
Lee, Yu Jin (Department of Construction Safety Engineering, Daejeon University)
Lee, Yong Cheon (Department of Construction Safety Engineering, Daejeon University)
Kim, Young Seog (Department of Earth Environment, Pukyong University)
Kang, Tae Seob (Department of Earth Environment, Pukyong University)
Publication Information
The Journal of Engineering Geology / v.32, no.4, 2022 , pp. 559-569 More about this Journal
Abstract
This study investigated the acidification and mixing with seawater of groundwater, stream water, and reservoir water in the Hunghae area of Pohang City, as well as the source of water expelled to the stream by liquefaction induced by the Pohang earthquake on 15 November 2017. Geologically, the area consists of Tertiary sedimentary rocks. We collected six samples of groundwater, five of reservoir water, four of stream water, two of liquefaction water, and one of seawater to analyze the chemical composition and stable isotopes (𝛿D and 𝛿18O). Gogkang Stream flows eastward through the central part of the study area into the East Sea. The groundwater and reservoir water in the lower part of the stream are acidic (pH < 4), have a Ca(Mg)-SO4 composition, and high concentrations of Al, Fe, and Mn, likely due to the oxidation of pyrite in Tertiary rocks. The groundwater in the upper part of the stream have a Ca(Na)-HCO3(Cl) composition, indicating the mixing of seawater with the stream water. The 𝛿D and 𝛿18O isotope data indicate the isotopic enrichment of reservoir water by evaporation. Based on the chemical and isotopic data, it is inferred that the two samples of liquefaction water originated from alluvium water in a transition zone with stream water, and from deep and shallow groundwaters that has been infiltrated by seawater, respectively.
Keywords
groundwater; acidification; pyrite; mixing of seawater; isotope; evaporation; liquefaction water;
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Times Cited By KSCI : 1  (Citation Analysis)
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