Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Evaluating the Soil Salinity of Reclaimed Wastewater Irrigation in Paddy Plots using the Soil-Water-Atmosphere-Plant Model and Water Management Response Indicators

하수처리수의 재이용에 따른 SWAP 모형과 물관리반응지수를 이용한 논에서의 토양염분 평가

  • Jang, Tae-Il (Department of Biological & Agricultural Engineering, University of Georgia, USA/Research Institute for Agricultural & Life Sciences, Seoul National University) ;
  • Hwang, Sye-Woon (Water Institute, University of Florida) ;
  • Jeong, Han-Seok (Rural Systems Engineering, College of Agricultural & Life Science, Seoul National University) ;
  • Kang, Moon-Seong (Rural Systems Engineering, Research Institute for Agricultural & Life Sciences, College of Agricultural & Life Science, Seoul National University) ;
  • Park, Seung-Woo (College of Agricultural & Life Science, Seoul National University)
  • Received : 2012.01.27
  • Accepted : 2012.03.13
  • Published : 2012.03.31
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Abstract

본 연구에서는 하수재이용에 따른 논에서의 토양염분 변화를 추정하기 위하여 경기도 화성시 수원환경사업소 인근에 위치한 병점지구를 대상으로 수문순환과 작물성장과의 관계를 고려한 SWAP (Soil-Water-Atmosphere-Plant) 모형을 이용하여 평가하였다. 실험에 사용한 관개용수는 지하수 (TR#1), 하수처리장 방류수+여과+UV (TR#3)로 분류하여 모형에 사용하였다. 유입관개수의 EC (Electrical Conductivity)는 지하수 관개수인 TR#1이 다른 처리구에 비해 작았고, TR#3의 경우 0.442~0.698 dS $m^{-1}$의 범위를 보였다. 모형의 보정과 검정을 위해서 대상지구에 FDR (Frequency Domain Reflection)을 설치하여 토양수분함유량과 염분농도를 토심에 따라 일단위로 모니터링 하였다. 토심 (50, 100, 140 cm)에 따른 토양함수량의 RMSE는 검정기간 중 TR#1에서 0.003~0.064 $cm^3\;cm^{-3}$, TR#3에서 0.001 $cm^3\;cm^{-3}$ 범위를 보여 주었고, 토양염분의 보정기간 중 토심별 RMSE는 TR#1에서 0.018~0.037 dS $m^{-1}$, TR#3에서 0.004~0.014 dS $m^{-1}$ 범위를 보여 적용성이 있는 것으로 나타났다. 토양내의 염분수지 분석 결과, 토양에서의 염분저장량이 (-)로 나타나 토양내로 침출되는 것으로 나타났으며, WMRI (Water Management Response Indicators)을 이용한 분석 결과, 높은 침투능으로 인하여 토양에서의 염분 집적 영향은 낮은 것으로 평가되었다.

Keywords

References

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