Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Evaluation of Suspended Solids and Eutrophication in Chungju Lake Using CE-QUAL-W2

CE-QUAL-W2를 이용한 충주호의 부유물질 및 부영양화 모의평가

  • Ahn, So Ra (Department of Civil and Environmental System Engineering, Konkuk University) ;
  • Kim, Sang Ho (Department of Civil and Environmental System Engineering, Konkuk University) ;
  • Yoon, Sung Wan (Department of Environmental Engineering, Chungbuk National University) ;
  • Kim, Seong Joon (Department of Civil and Environmental System Engineering, Konkuk University)
  • 안소라 (건국대학교 사회환경시스템공학과) ;
  • 김상호 (건국대학교 사회환경시스템공학과) ;
  • 윤성완 (충북대학교 환경공학과) ;
  • 김성준 (건국대학교 사회환경시스템공학과)
  • Received : 2013.05.20
  • Accepted : 2013.10.15
  • Published : 2013.11.30
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Abstract

The purpose of this study is to evaluate the suspended solids and eutrophication processes relationships in Chungju lake using CE-QUAL-W2, two-dimensional (2D) longitudinal/vertical hydrodynamic and water quality model. For water quality modeling, the lake segmentation was configured as 7 branches system according to their shape and tributary distribution. The model was calibrated (2010) and validated (2008) using 2 years of field data of water temperature, suspended solids (SS), total nitrogen (TN), total phosphorus (TP) and algae (Chl-a). The water temperature began to increase in depth from April and the stratification occurred at about 10 m early July heavy rain. The high SS concentration of the interflow density currents entering from the watershed was well simulated especially for July 2008 heavy rainfall event. The simulated concentration range of TN and TP was acceptable, but the errors might occur form the poor reflection for sedimentation velocity of nitrogen component and adsorption-sediment of phosphorus in model. The concentration of Chl-a was simulated well with the algal growth patterns in summer of 2010 and 2008, but the error of under estimation may come from the use of width-averaged velocity and concentration, not considering the actual to one side inclination by wind effect.

본 연구의 목적은 충주호 유역을 대상으로 2차원 횡방향 평균 수리 및 수질모형인 CE-QUAL-W2를 이용하여 호소내 수온분포, 부유물질 및 부영양화 과정의 변화특성을 모의하고 모형의 적용성을 평가하는 것이다. 지형 및 단면자료 구축을 위해 충주호를 남한강 본류(branch 1)와 유입 경계부(branch 2~7)로 구분하여 격자를 구성하였다. 호소 수질모델링을 위한 주요 입력 자료로 기상자료, 호소의 수온과 탁도 초기조건, 하천의 유량과 수온, 수질 경계조건 자료를 구축하였다. 이후 실측된 수온, 부유물질(SS), 총질소(TN), 총인(TP), 조류(Chl-a)에 대하여 모형의 보정(2010) 및 검증(2008)을 수행하여 모형의 적용가능성을 평가하였다. 충주호의 수온은 4월부터 표층수온이 증가하여 7월초에 성층현상이 발생되고 12월에는 연직수온분포가 일정하게 유지되었다. 집중호우 발생 후에는 성층구조가 교란되어 수온약층이 약 10 m가량 하강하였다. SS는 수온과 동일한 패턴으로 집중호우 발생 후에 증가하다가 12월에 안정화되었으며, 2008년 7월에 발생된 중층밀도류의 분포 현상을 잘 재현하였다. TN, TP의 경우 농도의 범위를 잘 재현하였지만, 모형 내에서 질소성분의 침강속도 및 인의 흡착-침전과정이 적절히 모의되지 않아 오차가 발생하였다. Chl-a의 경우 2010년과 2008년 여름의 조류의 성장패턴을 잘 반영하였지만, 모형이 횡방향 평균 유속과 농도를 사용함에 따른 모형의 한계점이 나타났다.

Keywords

References

  1. Choi, K.S., Kim, B.C., Kim, H.B., and Sa, S.H. (2000). "Relationships Between Organic Carbon and CODMn in a Deep Reservoir, Lake Soyang, Korea." Korean Journal of Limnology, Vol. 33, No. 4, pp. 328-335.
  2. Chung, S.W. (2004). "Density Flow Regime of Turbidity Current into a Stratified Reservoir and Vertical Two-dimensional Modeling." Journal of Korean Society of Environmental Engineers, Vol. 26, No. 9, pp. 970-978.
  3. Chung, S.W., Oh, J.K., and Ko, I.H. (2005). "Simulations of Temporal and Spatial Distributions of Rainfall-Induced Turbidity Flow in a Reservoir Using CEQUAL-W2." Journal of the Korea Water Resources Association, Vol. 38, No. 8, pp. 655-664. https://doi.org/10.3741/JKWRA.2005.38.8.655
  4. Chung, S.W., Park, J.H., Kim, Y.K., and Yoon, S.W. (2007). "Application of CE-QUAL-W2 to Daecheong Reservoir for Eutrophication Simulation." Journal of Korean Society of Water Quality, Vol. 23, No. 1, pp. 52-63.
  5. Cole, T.M., and Tillman, D.H. (1999). Water Quality Modeling of Lake Monroe Using CE-QUAL-W2, Miscellaneous Paper EL-99-1.
  6. Cole, T.M., and Tillman, D.H. (2001). Water Quality Modeling of Allatoona and Wast Point Reservoir Using CE-QUAL-W2, U.S. Army Corps of Engineers.
  7. Deus, R., Brito, D., Mateus, M., Kenov, I., Fornaro, A., Neves, R., and Alves, C.N. (2013). "Impact evaluation of a pisciculture in the Tucurui reservoir (Para, Brazil) using a two-dimensional water quality model." Journal of Hydrology, Vol. 487, pp. 1-12. https://doi.org/10.1016/j.jhydrol.2013.01.022
  8. Fischer, H.B., List, E.J., Koh, R.C., Y. Imberger, J. and Brooks, N.H. (1979). Mixing in Inland and Coastal Waters. Academic Press, New York, New York.
  9. Jeong, S.A., and Park, S.S. (2004). "A Modeling Study of Lake Thermal Dynamics and Turbid Current for an Impact Prediction of Dam Reconstruction." Journal of Korean Society of Environmental Engineers, Vol. 27, No. 8, pp. 813-821.
  10. Jung, Y.R., Chung S.W., Ryu, I.G., and Choi, J.K. (2008). "Two-Dimensional Hydrodynamic and Water Quality Simulations for a Coinjunctive System of Daecheong Reservoir and Its Downstream." Journal of Korean Society of Water Quality, Vol. 24, No. 5, pp. 581-591.
  11. Kim, B.C., Choi, K,S., Kim, C.G., Lee, Y.H., Kim, D.S., and Park, J.C. (1998). "The Distribution of Dissolved and Particulate Organic Carbon in Lake Soyang." Korean Journal of Limnology, Vol. 31, No. 1, pp. 17-24.
  12. Kim, Y.H., Kim, B.C., Choi, K,S., and Seo, D.I. (2001). "Modeling of Thermal Stratification and Transport of Density Flow in Soyang Reservoir Using the 2-D Hydrodynamic Water Quality Model, CE-QUAL-W2." Journal of the Korean Society of Water and Wastewater, Vol. 15, No. 1, pp. 40-49.
  13. Kim, Y.K., and Chung, S.W. (2011). "Research Paper : Laterally-Averaged Two-Dimensional Hydrodynamic and Turbidity Modeling for the Downstream of Yongdam Dam." Journal of Korean Society of Water Quality, Vol. 27, No. 5, pp. 710-718.
  14. Kuo, J.T., Lung, W.S., Yang, C.P., Liu, W.C., Yang, M.D., and Tang, T.S. (2006). "Eutrophication modelling of reservoirs in Taiwan." Environmental Modeling & Software, Vol. 21, pp. 829-844. https://doi.org/10.1016/j.envsoft.2005.03.006
  15. Martin, N., McEachern, P., Yu, T., and Zhu, D.Z. (2013). "Model development for prediction and mitigation of dissolved oxygen sags in the Athabasca River, Canada." Science of The Total Environment, Vol. 443, pp. 403-412. https://doi.org/10.1016/j.scitotenv.2012.10.030
  16. Norton, G.E., and Bradford, A. (2009). "Comparison of two stream temperature models and evaluation of potential management alternatives for the Speed River, Southern Ontario." Journal of Environmental Management, Vol. 90, pp. 866-678. https://doi.org/10.1016/j.jenvman.2008.02.002
  17. Ostfeld, A., and Salomons, S. (2005). "A hybrid genetic-instance based learning algorithm for CE-QUAL-W2 calibration." Journal of Hydrology, Vol. 310, pp. 122-142. https://doi.org/10.1016/j.jhydrol.2004.12.004
  18. Park, J.Y., Park, M.J., Ahn, S.R., and Kim S.J. (2009). "Watershed Modeling for Assessing Climate Change Impact on Stream Water Quality of Chungju Dam Watershed." Journal of the Korea Water Resources Association, Vol. 42, No. 10, pp. 877-889. https://doi.org/10.3741/JKWRA.2009.42.10.877
  19. Yi, Y.K., Kim, Y.D., Park, K.Y., and Kim, W.G. (2005). "Two Dimensional Numerical Modeling of Turbidity Variation in Imha Reservoir." Journal of the Korean Society of Civil Engineers, Vol. 25, No. 4B, pp. 257-266.
  20. Yoo, S.J., Kim C.S., Ha, S.Y., Hwang, J.Y., and Chae, M.H. (2005). "Analysis of Natural Organic Matter (NOM) Characteristics in the Geum River." Journal of Korean Society of Water Quality, Vol. 21, No. 2, pp. 125-131.

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