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http://dx.doi.org/10.14249/eia.2019.28.3.245

Analysis of Water Quality Variation by Lowering of Water Level in Gangjeong-Goryong Weirin Nakdong River  

Park, Dae-Yeon (Department of Environmental Engineering, Chungbuk National University)
Park, Hyung-Seok (Department of Environmental Engineering, Chungbuk National University)
Kim, Sung-Jin (Department of Environmental Engineering, Chungbuk National University)
Chung, Se-Woong (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Environmental Impact Assessment / v.28, no.3, 2019 , pp. 245-262 More about this Journal
Abstract
The objectives of this study were to construct a three-dimensional water quality model (EFDC) for the river reach between Chilgok Weir and Gangjeong-Goryong Weir (GGW) located in Nakdong River, and evaluate the effect of hydraulic changes, such as water level and flow velocity, on the control of water quality and algae biomass. After calibration, the model accurately simulated the temporal changes of the upper and lower water temperatures that collected every 10 minutes, and appropriately reproduced changes in organic matter, nitrogen, phosphorus, and cyanobacteria. However, the simulated values were overestimated for the diatoms and green algae cell density, possibly due to the uncertainties of the parameters associated with algae metabolism and the lack of zooplankton predation function in the simulations. As a result of scenario simulation of running the water level of GGW from EL. 19.44 m to EL. 14.90 m (4.54 m drop), Chl-a and algae cell density decreased significantly.In particular,the cyanobacteria on the surface layer, which causes algal bloom, declined by 56.1% in the low water level scenario compared to the existing management level. The results of this study are in agreement with the previous studies that maintenance of critical flow velocity is effective for controlling cyanobacteria, and imply that hydraulic control such as decrease of water level and residence time in GGW is an alternative to limit the overgrowth of algae.
Keywords
Algal Bloom; Cyanobacteria; Nakdong River; Water Level; Weir; EFDC;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Kim DM, Park HS, Chung SW. 2017a. Relationship of the Thermal Stratification and Critical Flow Velocity Near. Journal of Korean Society on Water Environment. 33(4): 449-459. [Korean Literature]   DOI
2 Kim SM, Park YK, Lee DJ. 2017b. Prediction of Water Quality Change in Saemangeum Reservoir by Floodgate Operation at Upstream. J. Korea Water Resour. Assoc. 50(6): 373-386. [Korean Literature]   DOI
3 K-water. 2017. Analysis on the Mechanism of Algal Bloom and Seasonal Succession in 1st Year. K-water. [Korean Literature]
4 K-water. 2018. Analysis on the Mechanism of Algal Bloom and Seasonal Succession in 2nd Year. K-water. [Korean Literature]
5 Kim DM. 2018. Simulations of the Correlation of Algal Bloom and Critical Veloicty in a Regulated River. 10pages. Master's Course. Dissertation. Chungbuk National University. Chungbuk. [Korean Literature]
6 Mitrovic SM, Oliver RL, Rees C, Bowling LC, Buckney RT. 2003. Critical Flow Velocities for the Growth and Dominance of Anabaena Cardinalis in Some Turbid Freshwater Rivers, Freshwater Biology. 48: 164-174.   DOI
7 Ministry of Land, Transport and Maritime Affairs Busan Territory Management Administration. 2009. Primary River Planning of Nakdong River Basin. [Korean Literature]
8 Murray Darling Basin Authority. 2012. Barmah Millewa Forest Environmental Water Management Plan. Australian Government, Murray Darling Basin Authority.
9 Paerl HW. 1988. Growth and Reproductive Strategies of Freshwater Blue-green Algae (Cyanobacteria). In SANDGREN CD (Ed.). New York : Cambridge University Press. p. 261-315.
10 Reynolds CS. 1987. Cyanobacterial Water Blooms. Adv. Bot. Res. 13: 67-143.   DOI
11 Sherman BS, Webster IT. 1998. Transitions between Aulacoseira and Anabaena Dominance in a Turbid River Weir Pool, Limnology and Oceanography. 43(8): 1902-1915.   DOI
12 Tetra Technologies Incorporated. 2007. The Environmental Fluid Dynamics Code Theory and Computation Volume 3: Water Quality Module.
13 The Board of Audit and Inspection of Korea. 2013. Audit Result Report on the Status of Main Facilities Quality and Water Quality Management in Four River Restoration Projects. The Board of Audit and Inspection of Korea. [Korean Literature].
14 Yin ZH, Seo DI. 2013. Water Quality Modeling of the Ara Canal, using EFDC-WASP Model in Series. J. Kor. Soc. Environ. Eng. 35(2): 101-108. [Korean Literature]   DOI
15 Fogg GE. 1968. The Physiology of an Algal Nuisance. Proc Roy Soc Lond B. 173: 175-189.
16 Dynamic Solutions International. 2016b. CVL Grid1.1 Users Guide, Technical report.
17 Alexander JH, Charles RG. 1994. Limnology, Singapore, McGraw-Hill.
18 Craig PM. 2014. Sigma-Zed: A Computationally Efficient Approach to Reduce the Horizontal Gradient Error in the EFDC's Vertical Sigma Grid. Proceedings of the 11th International Conference on Hydrodynamics (ICHD, Singapore, October 2014).
19 Chapra SC, Boehlert B, Fant C, Bierman Jr VJ, Henderson J, Mills D, Mas DML, Rennels L, Jantarasami L, Martinich J, Strzepek KM, Paerl HW. 2017. Climate Change Impacts on Harmful Algal Blooms in US Freshwaters: A Screening-Level Assessment. Environmental Science & Technology. 51(16): 8933-8943.   DOI
20 Dynamic Solutions International. 2016a. EFDC Explorer8.0 and EFDC+ Guidance New Features and Functionality, Technical report.
21 Hamrick JM. 1992. A Three-dimensional Environmental Fluid Dynamics Computer Code : Theoretical And Computational Aspects. The College of William and Mary, Virginia Institute of Marine Science, Gloceslter Point, V A.
22 Hwang HS. 2017. Mitigation of Algal Bloom by Flow Management of Multipurpose Weirs in Nakdong River. Ph.D. Dissertation. Chungbuk National University, Chungbuk. [Korean Literature]
23 Kim YK, Chung SW. 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]