Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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2-D Hydrodynamic Analysis using EFDC in the Nakdong River - Focused on Velocity and Arrival Time Between Weirs -

EFDC 모형을 이용한 낙동강에서의 2차원 수리해석 - 보 구간의 유속 및 도달시간 중심으로 -

  • KIM, Beom-Jin (Structural Safety and Prognosis Research Division, Korea Atomic Energy Research Institute) ;
  • KIM, Byung-Hyun (School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National Univ) ;
  • HAN, Kun-Yeun (School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National Univ)
  • 김범진 (한국원자력연구원 기기구조예측진단연구부) ;
  • 김병현 (경북대학교 건설.환경.에너지공학부) ;
  • 한건연 (경북대학교 건설.환경.에너지공학부)
  • Received : 2020.04.27
  • Accepted : 2020.05.29
  • Published : 2020.06.30
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Abstract

This study performed 2-D(two-dimensional) hydrodynamic analysis using EFDC in the Nakdong River. For the simulation of the flood season and non-flood season, the measured data including water level, weir outflow and tributary inflow were used, and the accuracy and applicability of the model were verified by comparing the measured water level and computed one. In addition, statistical quantitative assessment of the model performance was performed by estimating PBIAS, RSR, and RMSE for the computed water level. Then, the average velocity for each section between weirs was calculated by applying constant discharge conditions, and it was compared and verified with the measured velocity by Hydrological Survey Center. In this study, a simple method for estimating the arrival time was proposed, and it is expected that it will be practically applicable in field practices such as flood forecasting and warning.

본 연구에서는 낙동강을 대상으로 EFDC 모형을 구축하고, 2차원 수리해석을 수행하였다. 홍수기와 평수기에 대한 모의를 위해 실측수위, 보 방류량, 지류유입량을 포함하는 실측자료를 이용하였으며, 계산 결과를 관측소에서의 실측수위와 비교함으로서 적용 모형의 정확성과 적합성을 검증하였다. 또한, 계산결과에 대한 PBIAS, RSR, RMSE를 산정하여 모형의 통계적 정량적인 평가도 수행하였다. 모형의 검증 후 보의 일정 방류 시나리오 유량조건을 적용하여 각 보 구간별 평균유속을 산정하였으며, 산정된 평균유속은 유량조사사업단에서 조사한 평균유속과의 비교 및 검증을 실시하였다. 그리고 현장에서 실무적으로 적용 가능한 간편 도달시간 산정방법을 제안하고 그 방법을 적용하여 도달시간을 산정하였으며, 제안 방법은 홍수 예경보 등 현장의 실무에서 실제 적용이 가능할 것으로 기대된다.

Keywords

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