Simulations of the Effect of Flow Control and Phosphate Loading on the Reduction of Algae Biomassin Gangjeong-Goryong Weir

park dae yeon; sungjin kim; Park, Hyung Seok; Chung, Se-woong

The purpose of this study was to validate the EFDC model forthe weir pool of GangjeongGoryong Weir located in NakdongRiver, and evaluate the effect offlow control and phosphate loading reduction on the water quality and algae biomass by group (Diatom, Green, Cyanobacteria). As a result of model validation using 2018 experimental data,the time series of waterlevel and vertical distribution of water temperature, DO, organic matter, nitrogen, and phosphorus time series were properly simulated. Seasonal fluctuations of algae biomass by group were adequately reproduced, but the deviations between measured and simulated values were significant in some periods. As a result of scenario simulations to control the waterlevel and flow rate, the thermal stratification was resolved as the water level was lowered and the flow rate increased. The flow velocity at which the water temperature stratification was resolved was about 0.1 m/s, which is consistent with the previous study results of BaekjeWeirin Geum River. Simulations ofthe 2Q flow scenario showed that Chl-a decreased by 8.7% and the cell density of diatom and green algae declined. The cell density of cyanobacteria increased, however, because the high concentrations of cyanobacteria in the upstream boundary conditions directly affected downstream due to increased flow velocity. In the scenario simulation of reducing the influent phosphate load concentration (average 0.056 mg/L) to 50%, Chl-a decreased by 13.6%.The results suggestthatthe upstream algae concentration and phosphorus load reduction should be considered simultaneously with hydraulic control to prevent algal overgrowth of GangjeongGoryong Weir.

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* 2022년 이후 발행 논문의 참고문헌은 현재 구축 중입니다.

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