Use of Electromagnetic Inductance for Salinity Measurement in Reclaimed Saline Land

전자장 유도 장치를 이용한 간척지 토양의 염농도 측정

  • Jung, Yeong-Sang (Institute of Agricultural Science, Kangwon National University) ;
  • Lee, Won-Ho (Institute of Agricultural Science, Kangwon National University) ;
  • Joo, Jin-Ho (Institute of Agricultural Science, Kangwon National University) ;
  • Yu, Il-Ho (Institute of Agricultural Science, Kangwon National University) ;
  • Shin, Wan-Sik (Agricultural R & D Promotion Center) ;
  • Ahn, Yeol (Rural Research Institute, Korea Agricultural and Rural Infrastructure Corporation) ;
  • Yoo, Sun-Ho (College of Agriculture and Life Sciences, Seoul National University)
  • 정영상 (강원대학교 농업생명과학대학 농업과학연구소) ;
  • 이원호 (강원대학교 농업생명과학대학 농업과학연구소) ;
  • 주진호 (강원대학교 농업생명과학대학 농업과학연구소) ;
  • 유일호 (강원대학교 농업생명과학대학 농업과학연구소) ;
  • 신완식 (농림기술관리센터) ;
  • 안열 (농업기반공사 농촌환경연구원) ;
  • 류순호 (서울대학교 농업생명과학대학)
  • Received : 2002.01.01
  • Accepted : 2003.02.18
  • Published : 2003.04.30

Abstract

Mapping of salinity distribution in the reclaimed lands was attempted by using the electromagnetic inductance technique. Field study was conducted to monitor ground conductivity with an electromagnetic inductance, EM 38 (Geonics), and electrical conductivity of the saturated extract, ECe of the soils, at the Daeho reclaimed land. EM values of horizontal mode, EMh, and vertical mode, EMv, mode were recorded at the interval of $2m{\times}2m$ from the ground. Soil samples were taken through the profile down to 100cm for calibration. ECe of poor drained area of Daeho, were in the range of $19.50-91.50ds\;m^{-1}$, while ECe of well-drained area ranged from $1.10-34.40ds\;m^{-1}$. Multiple regression equations for the measured EMv, EMh, and ECe were highly significant. The EMh showed higher correlation with ECe than EMv. With the multiple equation, ECgM could be calculated. Correlation between ECe and ECgM was the highest ($r=0.753^{***}$), when EMI readings were taken on the ground. The relationships were highly significant below 30 cm height of measurement, With the EM38 measurement, the salinity distribution was effectively expressed for the experimental filed in Daeho reclaimed land.

본 연구는 간척지 토양에 대한 염류의 특성 및 분포를 비파괴 전자장 유도장치인 EM38을 이용하여 염류도의 공간변이성 및 분포도 작성을 수행하였다. 또한 EM38의 측정치를 깊이별 포화침출액의 ECe로부터 다중회귀방정식을 구하여 ECe의 값을 산정 하였다. 이러한 예측된 값으로부터 시험포장의 배수가 양호한 지역과 불량한 지역, 암거배수관이 설치된 지역의 염류도의 특성과 용탈층과 집적층의 구분의 활용성에 대해 조사를 수행하였다. 전자장 유도장치인 EM38의 수직적인 EMI측정값인 EMv와 수평적인 EMI측정값인 EMh값으로부터 분포도를 작성한 결과 시험포장의 특성을 정확히 구현할 수 있었다. 전자장 유도장치인 EM38의 수직적인 EMI 측정값인 EMv와 수평적인 EMI측정값인 EMh값을 지면으로부터 0, 10, 30 cm높이에서 측정한 결과 30 cm까지는 높은 상관관계를 보였으나, 50 cm이상에서는 상관관계를 보이지 않았다. 깊이별 가중치를 계산하여 얻은 ECgH, ECgV, ECgM의 값은 지면에서부터 높이 30 cm까지의 측정법에서는 매우 높은 상관관계를 보였고, 지면에서 측정한 EMv 와 EMh 의 ECgM의 회귀관계식이 가장 유의성 ($r2=0.753^{***}$)이 높은 것으로 나타났다. 예측치 회귀방정식 또한 지면으로부터 30 cm까지는 높은 상관관계를 보여주나 그 이상에서는 낮은 상관관계를 나타냈다.

Keywords

References

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