[논문]해담수 밀도차를 고려한 낙동강하굿둑 해수유입량 산정식 개발

정석일; 이상욱; 허영택; 김영성; 김화영

doi:10.3741/jkwra.2022.55.5.383

해담수 밀도차를 고려한 낙동강하굿둑 해수유입량 산정식 개발
Development of seawater inflow equations considering density difference between seawater and freshwater at the Nakdong River estuary 원문보기

Journal of Korea Water Resources Association = 한국수자원학회논문집, v.55 no.5, 2022년, pp.383 - 392

정석일 (K-water 낙동강유역관리처) , 이상욱 (K-water 수자원환경연구소) , 허영택 (K-water 수자원환경연구소) , 김영성 (K-water 수자원환경연구소) , 김화영 (K-water 부산권지사)

초록
AI-Helper

낙동강하굿둑 기수역의 복원이 국정과제로 채택되면서, 2019~2020년의 실증실험과 2021년 시범운영을 거쳐 2022년 기수역 복원이 공식화 되었다. 해수유입 시 많은 의사결정이 실시간으로 수행되어야 하므로, 실측과 수치해석을 이용한 의사결정시스템이 체계화되었으며, 이 과정에서 정확한 해수유입량 산정이 필요하였다. 이에 본 연구에서는 해수와 담수의 밀도차이와 낙동강하굿둑 수문의 구조적인 특성을 반영한 해수유입량 산정식을 개발하였다. 낙동강하굿둑 수문은 월류와 저류방식으로 해수유입이 가능하므로, 산정식 또한 두 가지 형태로 제시하였다. 개발된 식의 정확도 확인 및 유량계수 도출을 위하여 시범운영 기간동안 ADCP를 이용하여 해수유입량을 실측하였다. 완성된 식을 이용한 계산값과 실측값의 비교 결과 약 3%의 오차를 확인하였다.

Abstract ▼ AI-Helper

The restoration of the Nakdong River estuary is one of the most important projects of the Ministry of Environment, Republic of Korea. A real-scale experiment of gate operation was executed from 2019 to 2020, and a pilot operation was performed in 2021. The gate of Nakdong River Estuary Barrier (NEB) is supposed to be continuously opened based on the experiment results. Many critical decisions should be made immediately during the experiment based on the real-time measured data and numerical analysis considering the seawater inflows. The decision-making sequence was made systematically with the accurate estimation of seawater inflow. The estimation of seawater inflow is the main research objective and the equations of seawater inflow were developed, reflecting the structural characteristics of NEB. The inflow equations were developed in two forms, overflow and underflow. ADCP (Acoustic Doppler Current Profiler) was used to measure seawater inflow, check the accuracy of the developed equations, and derive the flow coefficient. The comparison error of the developed equations was about 3% compared to the measured data.

주제어

표/그림 (11)

그림 Fig. 1. River topography and structures of Nakdong River estuary
그림 Fig. 2. Gates of Nakdong River estuary barrier (http://eiwms.kwater.or.kr)
그림 Fig. 3. Basic concept of discharge in submerged flow (Tullis et al., 2007)
그림 Fig. 4. Conceptual diagram of NEB gate
그림 Fig. 5. Current measuring system of NEB control gate (#9)
그림 Fig. 6. Current measuring using ADCP & auto moving system
표 Table 1. Time and method of seawater-inflow
그림 Fig. 7. Discharge coefficient (C₀) equations for overflow
그림 Fig. 8. Changing in the flow-area according to the opening of radial gate
그림 Fig. 9. Discharge coefficient (C_u) equations for underflow
그림 Fig. 10. Comparison of measured and calculated discharge

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