Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Statistical Assessment of Increasing Tidal Mixing Effects on Water Quality in the Shiwha Coastal Reservoir

시화호 해수유통량 증대에 따른 통계학적 수질 영향 분석

  • Lee, Bum-Yeon (Department of Environmental Engineering and Energy, Myongji University) ;
  • Lee, Chang-Hee (Department of Environmental Engineering and Energy, Myongji University)
  • 이범연 (명지대학교 환경에너지공학과) ;
  • 이창희 (명지대학교 환경에너지공학과)
  • Received : 2021.08.18
  • Accepted : 2021.10.06
  • Published : 2021.11.30
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Abstract

A tidal power plant (TPP) has been in operation since the end of 2011 to improve the water quality of Shihwa Coastal Reservoir (SCR). Tidal mixing rate increased 5.6 times after the TPP operation so that in this study, its effects on water quality was assessed through statistical analysis of long-term water quality monitoring data. It was found that the increased tidal mixing contributed to solving the hypoxia problem in the bottom water by preventing the summer stratification. The analysis also showed that the increased tidal mixing had different effects depending on the relative concentration difference for each water quality substances between the SCR and the outside of SCR. The average concentrations of some substances (chemical oxygen demand, total phosphorus, chlorophyll-a) with higher concentrations than the outside of SCR decreased due to the dilution effect, but the other substances (total nitrogen, dissolved inorganic nitrogen, dissolved inorganic phosphorus) with lower concentrations compared to the outside ones increased on the contrary. Factor analysis also showed a consistent result that the first factor accounting for the water quality was changed from the organic-related substances to the nutrient-related substances after the increased tidal mixing. These results imply that the focus of future water quality management needs shifting from the organic substances to the nutrients, particularly dissolved inorganic nutrients. Considering the effect of inflow seawater on the nutrients, the management area should be extended to cover not only SCR but also a certain area outside of SCR.

Keywords

Acknowledgement

이 연구는 명지대학교 교원에게 부여되는 연구년 사업의 지원을 받았습니다.

References

  1. Bae, Y. H., Kim, K. O., and Choi, B. H. (2010). Lake Sihwa tidal power plant project, Ocean Engineering, 37(5), 454-463. https://doi.org/10.1016/j.oceaneng.2010.01.015
  2. Gale, E., Pattiaratchi, C., and Ranasinghe, R. (2006). Vertical mixing processes in intermittently closed and open lakes and lagoons, and the dissolved oxygen response, Estuarine coastal and shelf science, 69, 205-216. https://doi.org/10.1016/j.ecss.2006.04.013
  3. Hong, J. S., Jung, R. H., Seo, I. S., Yoon, K., Choi, B., and Yoo, J. W. (1997). How are the spatio-temporal distribution patterns of benthic macrofaunal communities affected by the construction of Shihwa dike in the west coast of Korea?, Korean Journal of Fisheries and Aquatic Sciences, 30(5), 882-895. [Korean Literature]
  4. Kaiser, H. F. (1974). An index of factorial simplicity, Psychometrika, 39(1), 31-36. https://doi.org/10.1007/BF02291575
  5. Kang, Y. S., Chae, Y., and Lee, H. R. (2013). Changes in sea water characteristics due to operation of Shihwa tidal power plant, Journal of Korean Society of Coastal and Ocean Engineers, 25(4), 219-235. [Korean Literature] https://doi.org/10.9765/KSCOE.2013.25.4.219
  6. Kim, J. G., Kim, J. W., and Cho, E. I. (2002). The variation of water quality due to sluice gate operation in Shiwha lake, Journal of the environmental sciences, 11(12), 1205-1215. https://doi.org/10.5322/JES.2002.11.12.1205
  7. Kim, J. Y., Bhatta, K., Rastogi, G., Muduli, P. R., Do, Y., Kim, D. K., Pattnaik, A. K., and Joo, G. J. (2016) Application of multivariate analysis to determine spatial and temporal changes in water quality after new channel construction in the Chilika Lagoon, Ecological Engineering, 90, 314-319. https://doi.org/10.1016/j.ecoleng.2016.01.053
  8. Kim, M. and Koo, B. J. (2015). The intertidal area in Lake Sihwa after operation of the tidal power plant, Journal of the Korean Society for Marine Environment and Energy, 18(4), 310-316. [Korean Literature] https://doi.org/10.7846/JKOSMEE.2015.18.4.310
  9. Lee, C. H., Lee, B. Y., Chang, W. K., Hong, S., Song, S. J., Park, J., Kwon B. O., and Khim, J. S. (2014). Environmental and ecological effects of Lake Shihwa reclamation project in South Korea: A review, Ocean & Coastal Management, 102, 545-558. https://doi.org/10.1016/j.ocecoaman.2013.12.018
  10. Lee, C. K. (2016). Analysis of Flow characteristics during the operation of Sihwa tidal power plant, Master's Thesis, Graduate School of Inha University. [Korean Literature]
  11. Lee, Y., Hur, J., and Shin, K. H. (2014). Characterization and source identification of organic matter in view of land uses and heavy rainfall in the Lake Shihwa, Korea, Marine pollution bulletin, 84(1), 322-329. https://doi.org/10.1016/j.marpolbul.2014.04.033
  12. Mann, H. B. and Whitney, D. R. (1947). On a test of whether one of two random variables is stochastically larger than the other, The annals of mathematical statistics, 50-60.
  13. Ministry of Environment (ME). (1996). A comprehensive water quality management measures of Shihwa coastal reservoir, Ministry of Environment. [Korean Literature]
  14. Ministry of Maritime Affairs and Fishery (MOMAF). (2001). The 1st phase Shihwa environmental management master plan, Ministry of Maritime Affairs and Fishery. [Korean Literature]
  15. Ministry of Maritime Affairs and Fishery (MOMAF) and Gyeonggido. (2017). The 2nd phase total pollution load management system master plan of Shihwa coastal reservoir, Ministry of Maritime Affairs and Fishery, and Gyeonggido. [Korean Literature]
  16. Phlips, E. J., Love, N., Badylak, S., Hansen, P., Lockwood, J., John, C. V., and Gleeson, R. (2004). A comparison of water quality and hydrodynamic characteristics of the Guana Tolomato Matanzas national estuarine research reserve and the Indian river lagoon of Florida, Journal of Coastal Research, 93-109.
  17. Ra, K. T., Kim, J. K., Kim, E. S., Kim, K. T., Lee, J. M., Kim, S. K., Kim, E. Y., Lee, S. Y., and Park, E. J. (2013). Evaluation of spatial and temporal variations of water quality in lake Shihwa and outer Sea by using water quality index in Korea: A case study of influence of tidal power plant operation, Journal of the Korean Society for Marine Environment and Energy, 16(2), 102-114. [Korean Literature] https://doi.org/10.7846/JKOSMEE.2013.16.2.102
  18. Schallenberg, M., Larned, S. T., Hayward, S., and Arbuckle, C. (2010). Contrasting effects of managed opening regimes on water quality in two intermittently closed and open coastal lakes, Estuarine, Coastal and Shelf Science, 86(4), 587-597. https://doi.org/10.1016/j.ecss.2009.11.001
  19. Shihwa Coastal Reservoir Management Committee (SCRMC). (2007). The 2nd-phase of Shihwa environmental management master plan, Shihwa Coastal Reservoir Management Committee. [Korean Literature]
  20. Wijnhoven, S., Escaravage, V., Daemen, E., and Hummel, H. (2010). The decline and restoration of a coastal lagoon (Lake Veere) in the Dutch Delta, Estuaries and Coasts, 33(6), 1261-1278. https://doi.org/10.1007/s12237-009-9233-1
  21. Ysebaert, T., van der Hoek, D. J., Wortelboer, R., Wijsman, J. W., Tangelder, M., and Nolte, A. (2016). Management options for restoring estuarine dynamics and implications for ecosystems: A quantitative approach for the Southwest Delta in the Netherlands, Ocean & Coastal Management, 121, 33-48. https://doi.org/10.1016/j.ocecoaman.2015.11.005