수질자동측정망 자료의 항목별 이상치 비교 분석

Comparative Analysis on the Outlier Data of Each Parameter in Automatic Water Quality Monitoring Networks

  • 투고 : 2010.05.04
  • 심사 : 2010.06.21
  • 발행 : 2010.07.30

초록

Along the 4 major rivers in korea, there are automatic water quality monitoring (AWQM) stations to immediately respond to any pollution incident. Real-time data (temperature, DO, pH, EC and TOC) collected at each station were statistically treated to exclude outliers and keep valid data using Dixon's test and Discordance test. These applied methods were compared in terms of the number of the outliers sorted out. There was no significant difference between these methods. On the other hand, more outliers were sorted out from EC and TOC data, comparing with other water quality items. EC data did not show partly any variation for a long time at H station. If measured signal does not exceed ${\pm}0.001mS/cm$ from the sectional mean, the signal should be treated as normal data. Therefore, another routine was added to the data screening system, some data which were removed as outlier were restored.

키워드

참고문헌

  1. 국립환경과학원(2007). 수질자동측정망 데이터 공개 시스템 구축방안 연구.
  2. 국립환경과학원(2008). 수질자동측정망 데이터 공개 시스템 구축(I).
  3. 원선정, 허인애, 정동일, 강준원(2003). 수질자동측정망 경보수준 설정 방법에 관한 연구(경안천 지점의 DO 항목을 중심으로). 공동추계학술발표회논문집, 대한상하수도학회.한국물환경학회, pp. B91-B94.
  4. 임병진, 정은숙, 홍은영, 연인성, 김현욱(2009a). 이상치로부터 유효치의 실시간 복원. 공동추계학술발표회논문집, 대한상하수도학회.한국물환경학회. pp. 655-656.
  5. 임병진, 홍은영, 정은숙, 정동일, 김현욱, 허우명(2009b). 수질자동측정값의 정확도 확보 방안 연구(I). 정기학술대회논문집, 한국생물과학협회, pp. 40.
  6. 조용모, 오정우(1997). 자동측정망을 이용한 한강수계 수질변화 특성에 관한 조사연구. 수질보전 한국물환경학회지, 13(1), pp. 63-71.
  7. EPA (1998). EMPACT Information Management Handbook.
  8. Glasgow, H. B., Burkholder, J. M., Reed, R. E., Lewitus, A. J., and Kleinman, J. E. (2004). Real-time remote monitoring of water quality: a review of current applications, and advancements in sensor, telemetry, and computing technologies. Journal of Experimental Marine Biology and Ecology, 300(1-2), pp. 409-448. https://doi.org/10.1016/j.jembe.2004.02.022
  9. Ma, H., Tsai, T. F., and Liu, C. C. (2010). Real-time monitoring of water quality using temporal trajectory of live fish. Expert Systems with Application, 37(7), pp. 5158-5171. https://doi.org/10.1016/j.eswa.2009.12.076
  10. Oron, G. and Gitelson, A. (1996). Real-time quality monitoring by remote sensing of contaminated water-bodies : waste stabilization pond effluent. Water Resources, 30(12), pp. 3106-3114.
  11. Springer, J. J., Burkholder, J. M., Glibert, P. M., and Reed, R. E. (2005). Use of a real-time remote monitoring network (RTRM) and shipbome sampling to characterize a dinoflagellate bloom in the Neuse Estuary, North Carolina, USA. Harmful Algae, 4(3), pp. 533-551. https://doi.org/10.1016/j.hal.2004.08.017
  12. U. S. Environmental PRotection Agency (2006). Data Quality Assessment: Statistical Methods for Practitioners. EPA QA/G-9S.