• Geochemical Evolution of Mixing Zone with Freshwater and Seawater near the Coast Area during Underground Space Construction
  • Kim, Jiyeon;Kim, Byung-Woo;Kwon, Jang-Soon;Koh, Yong-Kwon;
  • Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute;Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute;Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute;Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute;
  • 지하공간건설 시 해안인근 담수-해수 혼합대의 지화학적 진화
  • 김지연;김병우;권장순;고용권;
  • 한국원자력연구원 방사성폐기물처분연구부;한국원자력연구원 방사성폐기물처분연구부;한국원자력연구원 방사성폐기물처분연구부;한국원자력연구원 방사성폐기물처분연구부;
Abstract
To understand the hyrogeochemical variation of bedrock aquifer during underground space construction, various graphical methods including multiple-component plots and chemical trends were used to estimate the mixing rate between seawater and freshwater and to investigate the evolution of water quality. The water chemistry and mixing rate between fresh and sea waters, which are generally localized in the construction area (MW-7, in land), shows typical characteristics of freshwater that doesn’t affect its validity as seawater intrusion. Especially, the water chemistry of a MW-4 (coastline) was classified as Na-Cl type, Na-HCO3 type, and Ca-Cl type due to the influence of the seawater intrusion. And hydrogeochemical and isotopic data show that local freshwater is subjected to geochemical processes, such as reverse ion-exchange. Throughout the Chadha’s diagrams, four different case histories with the temporal and spatial variation of groundwaters in the study area were proposed, which is recommended to interpret the hydrogeochemical reactions effectively.

Keywords: Underground space construction;Seawater intrusion;Mixing zone;Reverse ion-exchange;Chadha’s diagram;

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This Article

  • 2015; 20(7): 90-102

    Published on Dec 31, 2015

  • 10.7857/JSGE.2015.20.7.102
  • Received on Sep 7, 2015
  • Revised on Nov 9, 2015
  • Accepted on Dec 21, 2015