Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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A Study on the Analysis and Evaluation of Vulnerability Index for the Management of Nonpoint source in SoOak River Watershed

소옥천 유역 비점오염 관리를 위한 취약성 지수분석 및 평가에 관한 연구

  • KAL, Byung-Seok (Daonsolution. Co., Ltd) ;
  • MUN, Hyun-Saing (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • HONG, Seon-Hwa (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • PARK, Chun-Dong (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • GIL, Han-nui (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • PARK, Jae-Beom (Daonsolution. Co., Ltd)
  • 갈병석 ((주)다온솔루션) ;
  • 문현생 (국립환경과확원 금강물환경연구소) ;
  • 홍선화 (국립환경과확원 금강물환경연구소) ;
  • 박천동 (국립환경과확원 금강물환경연구소) ;
  • 길한뉘 (국립환경과확원 금강물환경연구소) ;
  • 박재범 ((주)다온솔루션)
  • Received : 2019.05.30
  • Accepted : 2019.06.19
  • Published : 2019.06.30
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Abstract

In this study, the characteristics of watershed and pollution source were investigated in SoOakcheon located in the upper stream of Daecheong Lake. The Dimension Index method was applied to index various watershed and pollution source data. The influence factors of each pollutant source were derived through correlation analysis between selected index and water quality monitoring data. BOD and COD were significantly influenced by population density and land area ratio, T-N by CN and rice area ratio, and T-P by population density and land area ratio, respectively. The discharge load is often used to establish non-point source countermeasures, but there is a difference between the water load and the water load in the lake or river. Therefore, in order to manage non-point pollution efficiently, it is necessary to analyze influential factors with high correlation with water quality and to manage the relevant factors with priority.

본 연구에서는 대청호 상류에 위치한 소옥천을 대상으로 유역 및 오염원 특성을 조사하여 각 특성별 지수를 분석하고 취약지역을 분석하였다. 다양한 유역 및 오염원 자료를 지수화하기 위하여 표준화법인 Dimension Index법을 적용하였으며 선정된 지수와 수질모니터링 자료와의 상관성 분석을 통해 각 오염원별 영향인자를 도출하였다. 오염원별 영향인자에 미치는 특성들은 각각의 유의성에 차이가 있었으며 BOD와 COD는 인구밀도와 대지면적 비율, T-N은 CN과 논면적 비율, T-P는 인구밀도와 대지면적 비율에서 유의한 영향이 있는 것으로 검토되었다. 오염원별 영향인자로 판단된 지수를 이용하여 취약지역 우선순위를 산정하였고 배출부하량을 고려하여 산정된 취약지역과 순위를 비교 검토하였다. 배출부하량은 비점오염 대책 수립시 많이 사용되고 있으나 호소나 하천에 유입되는 유달부하량과 차이가 있어 수질 모니터링 자료와의 상관성 분석시 수질과 유의미한 값이 낮게 나타났다. 따라서 효율적인 비점오염 관리를 위해서는 취약지역 선정과 함께 수질과 상관성 높은 영향인자를 분석하고 해당 인자에 대한 관리가 우선으로 필요할 것으로 판단된다.

Keywords

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FIGURE 1. Analysis flowchart

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FIGURE 2. Study area and sampling sites

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FIGURE 3. Result of Dimension Index

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FIGURE 4. Rank mapping through evaluation results

TABLE 1. Evaluation factor

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TABLE 2. CN by soil group according to land use(AMC-Ⅱ)

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TABLE 3. Classification of sub basin by river

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TABLE 4. Result of Dimension Index

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TABLE 5. Nonpoint Source sampling measurements

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TABLE 6. Analysis of correlation between water quality and index

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TABLE 7. Influence factor result

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TABLE 8. Correlation between standardization index and water quality

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TABLE 9. Correlation between Load index and water quality

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TABLE 10. Sub basin number by rank

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References

  1. Gyeonggido Assembly. Gyeonggido nonpoint source management area priority study, 2016,
  2. Kim, H.T., D.S., Shin, Y.S., Kim, 2014, Prioritization of Control Areas using Vulnerable Areas by Non-point Source Pollution. Journal of the Korean Society of Agricultural Engineers 56(6):11-18 https://doi.org/10.5389/KSAE.2014.56.6.011
  3. National Institute of Environmental Research, 2015, Decision of Prioritization of Catchments and Determination of Control Target for Non-point Source Pollution Management (III), Korea.
  4. National Institute of Environmental Research, 2017, The whole country pollution source materials of investigation
  5. Park, S.H., W.H., Jeong, S.J., Yi, B.S., Lim, 2010, A Study for the Selection Method of Control Area of Nonpoint Pollution Source, Journal of Korean Society on Water Quality, 26(5):761-767
  6. Park, H.S., S.W. Chung, S.W. Yoon. 2015. Characterizing Pollution Loading and Priority Regions in So-Okcheon Watershed. Journal of Industrial Science and Technology Institute. 29(2):51-55