농업용 저수지의 점오염원 바이패스 효과 평가를 위한 EFDC 모델의 적용
Application of EFDC Model to an Agricultural Reservoir for Assessing the Effect of Point Source Bypassing
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참고문헌
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초록
Agricultural reservoirs in Korea have been recognized as an emerging resource for recreational and cultural activities for residents. However, most of thereservoirs are eutrophic and showing high level of contamination with nuisance algal bloom and offensive odor during the summer. For bettermanagement and restoration of the reservoirs’ water quality, scientific modeling approaches could be used to diagnose the problems and evaluate theefficacy of alternative control measures. The objectives of this study were to validate the performance of a three-dimensional (3D) hydrodynamic andwater quality model (Environmental Fluid Dynamics Code, EFDC) for a eutrophic agricultural reservoir and assess the effect of bypassing of the effluentfrom a wastewater treatment plant on the reservoir water quality. The 3D model successfully simulated the temporal variations of water temperature, DO,TOC, nitrogen and phosphorus species and Chl-a observed in 2014 and also captured their spatial heterogeneity in the reservoir. The simulation resultsindicated that the point source bypassing may reduce the T-N and T-P concentrations of the reservoir by 6.6 ~ 8.2 %, and 1.7 ~ 16.8 %, respectively. Thebypassing, however, showed a marginal effect on the control of TOC due to the increased algal biomass associated with the increased water retention timeafter bypassing as well as the lower TOC level of the effluent compared to the ambient reservoir water.
Abstract
Agricultural reservoirs in Korea have been recognized as an emerging resource for recreational and cultural activities for residents. However, most of thereservoirs are eutrophic and showing high level of contamination with nuisance algal bloom and offensive odor during the summer. For bettermanagement and restoration of the reservoirs’ water quality, scientific modeling approaches could be used to diagnose the problems and evaluate theefficacy of alternative control measures. The objectives of this study were to validate the performance of a three-dimensional (3D) hydrodynamic andwater quality model (Environmental Fluid Dynamics Code, EFDC) for a eutrophic agricultural reservoir and assess the effect of bypassing of the effluentfrom a wastewater treatment plant on the reservoir water quality. The 3D model successfully simulated the temporal variations of water temperature, DO,TOC, nitrogen and phosphorus species and Chl-a observed in 2014 and also captured their spatial heterogeneity in the reservoir. The simulation resultsindicated that the point source bypassing may reduce the T-N and T-P concentrations of the reservoir by 6.6 ~ 8.2 %, and 1.7 ~ 16.8 %, respectively. Thebypassing, however, showed a marginal effect on the control of TOC due to the increased algal biomass associated with the increased water retention timeafter bypassing as well as the lower TOC level of the effluent compared to the ambient reservoir water.
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