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진승환(Seunghwan Jin),김동하(Dongha Kim),임학수(Hak Soo Lim),이희준(Hee Jun Lee) 한국연안방재학회 2021 한국연안방재학회지 Vol.8 No.4
The Dongsam seawater stream on a reclaimed land flows by tidal forcing. The flow in generally slow, especially in the central portion of the stream because the outflow and inflow each occurs at both ends of the stream simultaneously. As a result, sediments accmulate constantly with the deteorating water quality. In this study, field observation was conducted using Aquadrifter and Aquadopp and analyzed for the analysis of the flow velocity in the stream. The computational fluid dynamics (CFD) modeling was run with and without Seawater Stream Floodgate to predict the variability of the flow. The flow velocity of the Dongsam Seawater Stream was recorded in the range of 0.01 ~ 0.13 m/s, and the tidal range was within 1.0 m. According to the simulation, the flow velocity could increase remarkably with two floodgates used to force the stream to flow unidirectionally (toward Korea Maritime & Ocean University). The flow velocity change rate at each point is recorded -97 ~ 638% at P1 (front of Malfunction Floodgate near Busan Int. Cruise Terminal), -89 ~ 659% at P2 (back of Malfunction Floodgate near Busan Int. Cruise Terminal), -100 ~ 1198% at P3 (central channel), and at P4 (toward Korea Maritime & Ocean University) was -100 to 1163%, and Case III-a showed the largest flow velocity rate increase in the central part. Therefore, if two Floodgates are installed and flowed out toward Korea Maritime & Ocean University, the flow velocity rate of the Stream can be increased.
양방향 수문운용과 조위차 배수를 통한 동삼해수천의 유속 증대 및 수질개선 효과
홍성훈(Sunghoon Hong),진승환(Seunghwan Jin),김경태(Kyung Tae Kim),김동하(Dongha Kim),김정호(Jeongho Kim),장성철(Sung-Chul Jang),김현철(Hyunchul Kim),박진혁(Jin Hyeok Park),임학수(Hak Soo Lim) 한국연안방재학회 2023 한국연안방재학회지 Vol.10 No.3
To cope with the water pollution problem, the Dongsam seawater stream was newly renovated in 2022. For this maintenance, government constructed various facilities including electric swing sluice gates at both ends to enhance seawater exchange performance. In this regard, this study tries to quantify water velocity increment and water quality of the stream and offer suggestions for effective management. To achieve this goal, the authors performed literature review on water quality improvement, GPS buoy tracking experiments, long-term current measurement (Aquadopp), water quality monitoring, analysis of daily log data of the sluice gate. The results of this study indicate that operation of bi-directional swing sluice gates with maximum tidal range conditions can strengthen current intensity that contributes to enhance water quality of Dongsam seawater stream.