Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Relationship of the Thermal Stratification and Critical Flow Velocity Near the Baekje Weir in Geum River

금강 백제보 구간 수온성층 형성과 임계유속 관계

  • Kim, Dong-min (Department of Environmental Engineering, Chungbuk National University) ;
  • Park, Hyung-Seok (Department of Environmental Engineering, Chungbuk National University) ;
  • Chung, Se-Woong (Department of Environmental Engineering, Chungbuk National University)
  • Received : 2017.02.28
  • Accepted : 2017.07.18
  • Published : 2017.07.30
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Abstract

In Geum River of Korea, three multi-purpose weirs were built at the downstream of Daecheong Reservoir during the Four Major River Restoration Project (FMRRP). The weirs have altered the hydraulic characteristics of the river, and consequently transformed the large areas of flowing ecosystem to deep and wide stagnant environment. In every summer, a thermal stratification occurred near the Baekje Weir having mean depth of 4.0 m, and the surface algal blooms dominated by buoyant cyanobacteria have been frequently formed after the FMRRP. The objective of this study was to investigate the relationship between flow velocity and thermal stability of the waterbody using a three-dimensional (3D) hydrodynamic model (EFDC+) after calibration against the thermistor chain data obtained in 2014. A new Sigma-Zed vertical grid system of EFDC+ that minimize the pressure gradient errors was used to better simulate the thermodynamics of the waterbody. The model reasonably simulated the vertical profiles of the observed water temperatures. The vertical mean flow velocity and the Richardson Number (Ri) that represents the stability of waterbody were estimated for various management water levels and flow rates scenarios. The results indicated that the thermal stability of the waterbody is mostly high ($Ri{\gg}0.25$) enough to establish stratification, and largely depend on the flow velocity. The critical flow velocity that can avoid a persistent thermal stratification was found to be approximately 0.1 m/s.

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References

  1. Bonnet, M. P. and Poulin, M. (2002). Numerical Modelling of the Planktonic Succession in a Nutrient-Rich Reservoir: Environmental and Physiological Factors Leading to Mircrocystis aeruginosa Dominance, Ecological Emodelling, 156(2), 93-112. https://doi.org/10.1016/S0304-3800(02)00132-1
  2. Brookes, J. D. and Ganf, G. G. (2001). Variations in the Buoyancy Response of Microcystis Aeruginosa to Nitrogen, Phosphorus and Light. Journal of plankton research, 23(12), 1399-1411. https://doi.org/10.1093/plankt/23.12.1399
  3. Chung, S. W., Imberger, J., Hipsey, M. R., and Lee, H. S. (2014). The Influence of Physical and Physiological Processes on the Spatial Heterogeneity of a Microcystis Bloom in a Stratified Reservoir, Ecological Modelling, 289, 133-149. https://doi.org/10.1016/j.ecolmodel.2014.07.010
  4. Chung, S. W., Lee, H. S., Choi, J. K., and Ryu, I. G. (2009). Simulation of Thermal Stratification of Daecheong Reservoir using Three-dimensional ELCOM Model, Journal of Korean Society on Water Environment, 25(6), 922-934. [Korean Literature]
  5. Daejon Regional Construction and Management Administration (DRCMA). (2009). Schematic design of stream in Guem river, Daejon Regional Construction and Management Administration. [Korean Literature]
  6. Doyon, P., Klein, B., Ingram, R. G., Legendre, L., Tremblay, J. E., and Therriault, J. C. (2000). Influence of Wind Mixing and upper Layer Stratificaion on Phytoplankton Biomass in the Gulf of St. Lawrene, Deep Sea Research, 47, 415-433. https://doi.org/10.1016/S0967-0645(99)00113-7
  7. Drapcho, C. M. and Brune, D. E. (2000). The Partitioned Aquaculture System : Impact of Design and Environmental Parameters on Algal Productivity and Photosynthetic Oxygen Production, Aquaculture Engineering, 21, 151-168. https://doi.org/10.1016/S0144-8609(99)00028-X
  8. Dynamic Solutions International (DSI). (2016a). EFDC_Explorer8.0 and efdc+ Guidance New Features and Functionality, Technical report, Dynamic Solutions International.
  9. Dynamic Solutions International (DSI). (2016b). CVL_Grid1.1_Users Guide, Technical report, Dynamic Solutions International.
  10. Fischer, H. B., List, E. J., Koh, R. C. Y., Imberger, J., and Brooks, N. (1979). Mixing in inland and coastal waters Academic Press, New York, 229-242.
  11. Ford, D. E. and Johnson, L. S. (1986). An assessment of reservoir mixing processes, Technical Report E-86-7, U.S.Army Engineers Waterways Experiment Station, Vicksburg, MS.
  12. Hamrick, J. M. (1992). A three-dimensional environmental fluid Dynamics Computer Code : Theoretical And Computational Aspects, Virginia Institute of Marine Science, College of William and Mary.
  13. Ji, H. S. (2016). Dynamic Water Environment Monitoring and Assessing the Applicability of a 3D Model in a Shallow Reservoir, Master's thesis, ChungBuk National University. [Korean Literature]
  14. Jung, Y. R., Chung, S. W., Yoon, S. W., Oh, D. G.. and Jeong, H. Y. (2009). Evaluation of the Performance of Water Quality Models for the Simulation of Reservoir Flushing Effect on Downstream Water Quality, Journal of Korean Society on Water Environment, 25(1), 48-57. [Korean Literature]
  15. Kim, S. J., Seo, D. I., and Ahn, K, H. (2011). Estimation of Proper EFDC Parameters to Improve the Reproducibility of Thermal Stratification in Korea Reservoir, Korea Water Resources Association, 44(9), 741-751. [Korean Literature] https://doi.org/10.3741/JKWRA.2011.44.9.741
  16. Kim, Y. K. and Chung, S. W. (2011). Laterally-Averaged Two-Dimensional Hydrodynamic and Turbidity Modeling for the Downstream of Yongdam Dam, Journal of Korean Society on Water Environment, 27(5), 710-718. [Korean Literature]
  17. Li, F., Zhang, H., Xiao, Y., and Chen, L. (2013). Effect of Flow Velocity on Phytoplankton Biomass and Composition in a Freshwater Lake, Science of The Total Environment, 447(2), 64-71. https://doi.org/10.1016/j.scitotenv.2012.12.066
  18. Maier, H. R., Burch, M. D., and Bormans, M. (2001). Flow Management Strategies to Control Blooms of the Cyanobacterium, Anabaena circinalis, in the River Murray at Morgan, South Australia, Regulated Rivers Research & Management, 17, 637-650. https://doi.org/10.1002/rrr.623
  19. Maier, H. R., Kingston, G. B., Clark, T., Frazer, A., and Sanderson, A. (2004). Risk-based Approach for Assenssing the Effectiveness of Flow Management in Controlling Cyanobacterial Blooms in rivers, River Research and Applcations, 20, 459-471. https://doi.org/10.1002/rra.760
  20. Martin, J. L. and McCutcheon, S. C. (1999). Hydrodynamics and Transport for Water Quality Modeling, CRC Press, Inc.
  21. Mellor, G. L., Ezer, T., and Oey, L. Y. (1994). The Pressure Gradient Conundrum of Sigma Coordinate Ocean Models, Journal of Atmospheric and Oceanic Technology, 11(4), 1126-1134. https://doi.org/10.1175/1520-0426(1994)011<1126:TPGCOS>2.0.CO;2
  22. Ministry of Land, Infrastructure, and Transport, Ministry of Environment, Ministry of Agriculture, Food and Rural Affairs (MOLIT, MOE, and MAFRA). (2014). Operation standards of dam-weir-reservoir against water quality green algae, Ministry of Land, Infrastructure, and Transport, Ministry of Environment, Ministry of Agriculture, Food and Rural Affairs. [Korean Literature]
  23. Ministry of Land, Infrastructure, and Transport (MOLIT). (2013). Weir management regulations, Ministry of Land, Infrastructure, and Transport. [Korean Literature]
  24. Mitrovic, S. M., Oliver, R. L., Rees, C., Bowling, L. C., and Buckney, R. T. (2003). Critical Flow Velocities for the Growth and Dominance of Anabaena Cardinalis in Some Turbid Freshwater Rivers, Freshwater Biology, 48, 164-174. https://doi.org/10.1046/j.1365-2427.2003.00957.x
  25. Murray Darling Basin Authority (MDBA). (2012). Barmah Millewa Forest Environmental Water Management Plan, Australian Government, Murray Darling Basin Authority.
  26. Richmond, A. and Vonshak, A. (1978). Spirulina Culture in Israel, Arch, Hydrobiology, 11, 274-280.
  27. Tetra Technologies, incorporated (Tetra Tech). (2007a). The Environmental Fluid Dynamics Code Theory and Computation Volume 1 : Hydrodynamics and Mass Transport, Technical report
  28. Tetra Technologies, incorporated (Tetra Tech). (2007b). The Environ- mental Fluid Dynamics Code User Manual US EPA Version 1.01, Technical report
  29. The Board of Audit and Inspercion of Korea (BAI). (2013). 4 river restoration projects major facilities quality and water quality management, The Board of Audit and Inspercion of Korea. [Korean Literature]
  30. Websterm I. T., Sherman, B. S., Bormans, M., and Jones, G. (2000). Management Strategies for Cyanobacterial Blooms in an Impounded Lowland River, Regulated River: Research and Management, 16(5), 513-525. https://doi.org/10.1002/1099-1646(200009/10)16:5<513::AID-RRR601>3.0.CO;2-B
  31. Wetzel, R. G. (2001). Limnology : lake and river ecosystems. Academic press, New York.