Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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A Long-term Monitoring of Water Quality at Chongok Cave

천곡동굴의 수질환경 장기 모니터링

  • Jun, Byonghee (Kangwon National University, School of Fire & Disaster Prevention)
  • Published : 2013.09.01
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Abstract

The Chongok karst cave which is located in Donghae-city, has high tourist and educational value due to existence of many doline(sink hole). Whereas this cave is easy to approach for the tourists, because this cave is located near the downtown, a high environmental riskiness such as sewage flowing has been also involved. In study, we observed the variation of water quality with long-term monitoring and investigated the possibility of existence of impact factor to water eco-system and determined the proper long-term monitoring factor among many monitoring criteria. The groundwater quality was maintained in the range of about $14^{\circ}C$ in temperature, over 10mg/l in dissolved oxygen and 7-8 in pH, so the impact factor in water eco-system was not observed. The guide line to make sure of tourist safety was determined to 60mm/d as daily rainfall. The conductivity was suggested to main factor for long-term monitoring main factor and pH/turbidity was suitable for the supplementary factor. For the seasonal variation monitoring, ORP was recommended.

천곡동굴은 동해시에 자리잡고 있는 석회암동굴로서 많은 돌리네를 가지고 있어 관광적 가치와 교육적 가치가 매우 높다. 하지만 천곡동굴은 시가지에 위치하고 있어 접근이 용이한 반면 하수의 유입 등에 의해 환경적 영향을 받을 가능성이 매우 크다. 본 연구에서는 천곡동굴의 수질환경을 장기 모니터링하여 생태계의 영향을 조사하고, 향후 장기 모니터링을 위한 인자를 선정하였다. 그 결과 천곡동굴 내 지하수의 수온은 $14^{\circ}C$, 용존 산소량은 10mg/L 이상, pH는 7-8의 범위에서 안정되게 유지되고 있어, 수생태계에 부정적 영향을 주는 수질적 요소는 없는 것으로 판단되었다. 관람객의 안전을 확보하기 위한 강우기준으로서 일강우로서 60mm/d가 적절하며 향후 장기 모니터링을 위해서 전기전도도를 주된 인자로 이용하고 pH와 탁도를 보조적으로 활용하는 것이 적절하며, 계절적 변화 등을 ORP를 이용하여 모니터링하는 것이 적절하다고 판단되었다.

Keywords

References

  1. Choi, Y. S.(2009), Karst landforms in chon-gok dong, dong-hae shi, Master's Thesis, Kangwon National University, pp. 12-29 (in Korean).
  2. Gallardo, A. H. and Tase, N.(2007), Hydrogeology and geochemical characterization of groundwater in a typical small-scale agricultural area of Japan, Journal of Asian Earth Sciences, Vol. 29, Issue. 1, pp. 18-28. https://doi.org/10.1016/j.jseaes.2005.12.005
  3. George, V.(1999), A geomorphological strategy for conducting environmental impact assessments in karst areas, Geomorphology, Vol. 31, Issue. 1-4, pp. 151-180. https://doi.org/10.1016/S0169-555X(99)00077-X
  4. Hillebrand, O., Nodler, K., Licha, T., Sauter, M. and Geyer, T. (2012), Caffeine as an indicator for the quantification of untreated wastewater in karst systems, Water Research, Vol. 46, Issue. 2, pp. 395-402. https://doi.org/10.1016/j.watres.2011.11.003
  5. Hong, H. C.(2008), A study on the mechanism of environmental pollution in caves, Journal of the Korean Speleological Society, Vol. 89, No. 89, pp. 37-45 (in Korean).
  6. Kim, C. Y.(2009), Hydrological environment of korea caves, Journal of the Korean Speleological Society, Vol. 93, No. 93, pp. 53-68 (in Korean).
  7. Liu, Z., Li, Q., Sun, H. and Wang, J.(2007), Seasonal, diurnal and storm-scale hydrochemical variations of typical epikarst springs in subtropical karst areas of SW china: soil CO2 and dilution effects, Journal of Hydrology, Vol. 337, Issue. 1-2, pp. 207-223. https://doi.org/10.1016/j.jhydrol.2007.01.034
  8. Panno, S. V., Hackley, K. C., Hwang, H. H. and Kelly, W. R. (2001), Determination of the sources of nitrate contamination in karst springs using isotopic and chemical indicators, Chem. Geol. Vol. 179, Issue. 1-4, pp. 113-128. https://doi.org/10.1016/S0009-2541(01)00318-7
  9. Pu, J., Yuan, D., He, Q., Wang, Z., Hu, Z. and Gou, P.(2011), High-resolution monitoring of nitrate variation in a typical subterranean karst stream, Chongqing, China, Environment Earth Science, Vol. 64, pp. 1985-1993. https://doi.org/10.1007/s12665-011-1019-7
  10. Rheem, C. H. and Hong, S. H.(1993), An analysis on the water quality of limestone cave system in danyang region, Journal of the Korean Speleological Society, Vol. 34, No. 34, pp. 7-22 (in Korean).
  11. Tissier, G., Perrette, Y., Dzikowski, M., Poulenard, J., Hoblea, F., Malet, E. and Fanget, B.(2013), Seasonal changes of organic matter quality and quantity at the outlet of a forested karst system (La Roche Saint Alban, French Alps), Journal of Hydrology, Vol. 482, pp. 139-148. https://doi.org/10.1016/j.jhydrol.2012.12.045
  12. Williams, P. W.(1983), The role of the subcutaneous zone in karst hydrology, Journal of Hydrology, Vol. 61, Issue. 1-3, pp. 45-67. https://doi.org/10.1016/0022-1694(83)90234-2
  13. Zhang, C., Yun, J., Pei, J. and Jiang, Y.(2011), Hydrochemical variations of epikarst springs in vertical climate zone: a case study in Jinfo mountain national nature reserve of China, Environment Earth Science, Vol. 63, pp. 375-381. https://doi.org/10.1007/s12665-010-0708-y