Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Electrical and Hydraulic Characteristics of An Alluvial Bed under the Influence of Pumping and Rainfall

  • Woo-Ri Lim (Institute of Sustainable Earth and Environmental Dynamics (SEED), Pukyong National University) ;
  • Nam-Hoon Kim (Dohwa Engineering Co.) ;
  • Samgyu Park (Korea Institute of Geoscience and Mineral Resources) ;
  • Jae-Yeol Cheong (LILW Strategic Team, Korea Radioactive Waste Agency) ;
  • Se-Yeong Hamm (Department of Geological Sciences, Pusan National University)
  • Received : 2024.07.27
  • Accepted : 2024.08.21
  • Published : 2024.08.31
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Abstract

Alluvial beds are intimately associated with electrical properties related to soil types, including clay mineral content, porosity, and water content. The hydraulic property governs water movement and storage in alluvial beds. This study revealed electrical resistivity and hydraulic properties in space and time in relation to the hydrogeological data, groundwater pumping, and rainfall infiltration into the alluvial bed located in Daesan-myeon, Changwon City. An electrical resistivity survey with electrode spacings of 2 and 4m using a dipole-dipole array indicates that electrical resistivity changes in the alluvial bed depend on groundwater pumping and rainfall events. Additionally, rainfall infiltration varies with hydraulic conductivity in the shallow zone of the alluvial bed. The 2 m electrode spacing survey confirms that electrical resistivity values decrease at shallow depths, corresponding with rainfall and increased water content in the soil, indicating rainfall infiltration approximately 1-2 m below the land surface. The 4m electrode spacing survey reveals that hydraulic conductivity (K) values and electrical resistivity (ρ) values display an inverse relationship from the surface to the water table (approximately 9 m) and at deeper levels than the water table. Notably, ρ values are impacted by pumping around the depth of the water table at 9 m. This study suggests that time-lapsed electrical resistivity surveys in space and time could be effective tools for detecting the impact of rainfall and pumping, as well as hydraulic conductivity in shallow alluvial beds.

Keywords

Acknowledgement

This research was developed from the second author's the master thesis. This research was supported by grants from the Basic Research Projects (GP2020-007) of KIGAM, funded by the Korean Ministry of Science and ICT, and Global - Learning & Academic research institution for Master's·PhD students, and Postdocs (LAMP) Program of the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education (No. RS-2023-00301702).

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