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Geochemical and Geophysical Monitoring of Salinewater Intrusion in Korean Paddy Fields

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Abstract

The saline water intruded zone in paddy fields near the seashore can be diagnosed accurately by joint exploration with geophysical and geochemical methods. Using the electromagnetic (EM) sounding technique, the weakly consolidated zone which introduces saline water into such an area of near seashore paddy fields in Korea was detected from the variation of electrical conductivity distribution following field irrigation. Vertical electrical sounding (VES) with Schlumberger array and chemical analysis of top soils, and groundwater in the study area verified the intruded zone near the surface. The VES results showed that the intrusion of seawater occurred in the form of a channel down to 30 m below sea level. Geochemical analysis of the top soil samples for the six major elements found in seawater indicated that the region showing high concentrations is concordant with the weakly consolidated zone near the surface. The degree of contamination in the study area was investigated by comparing the soil data with those from a nearby old reclamation field. If remediation work is not done for this intrusion zone, the sodicity degree in the paddy soil is expected to increase compared with the reference site data.

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Authors and Affiliations

  1. Advanced Environmental Monitoring Research Center, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea

    Sang-Ho Lee, Kyoung-Woong Kim & Ilwon Ko

  2. Center for Natural Hazard Prevention Research, Korea Institute of Geology, Mining and Materials, Taejon, 305-350, Korea

    Sang-Gyu Lee & Hak-Soo Hwang

Authors
  1. Sang-Ho Lee
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  2. Kyoung-Woong Kim
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  3. Ilwon Ko
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  4. Sang-Gyu Lee
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  5. Hak-Soo Hwang
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Correspondence to Kyoung-Woong Kim.

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Lee, SH., Kim, KW., Ko, I. et al. Geochemical and Geophysical Monitoring of Salinewater Intrusion in Korean Paddy Fields. Environmental Geochemistry and Health 24, 277–291 (2002). https://doi.org/10.1023/A:1020507823002

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  • DOI: https://doi.org/10.1023/A:1020507823002

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