Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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A Study on the Sediment Deposition Height Computation at Gunsan Port Using EFDC

EFDC를 이용한 군산항의 유사 퇴적고 계산에 관한 연구

  • Received : 2012.10.21
  • Accepted : 2013.02.27
  • Published : 2013.05.31
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Abstract

This paper was considered on the applicability of EFDC KUNSAN_SEDTRAN MODEL (2012) to calculate Gunsan Port sediment deposition height efficiently and to use for grasping its aspects quantitatively and providing its prevention measures reasonably based on well-known 3-dimensional EFDC sediment transport module. This model was calibrated and verified with various measured field data of A Report of Hydrological Variation on Kum River Estuary (2004). Due to the model calibration and relevant literature investigation for cohesive sediment parameters, settling velocity (WS), critical deposition stress (TD), reference surface erosion rate (RSE), critical erosion stress (TE) were identified as 2.2E-04m/s, 0.20 $N/m^2$, 0.003 $g/s{\cdot}m^2$, 0.40 $N/m^2$ respectivly on this model. In order to examine the applicability and precision of the model computation, the calculated model data of sediment deposition height at 13 stations for 71 days and suspended-sediment concentration at 2 stations, inner port and outer port for 15 days were compared and analyzed with the measured field data. As a result, the model applicability for sediment deposition height simulation was evaluated as NSE coefficient 0.86 and the precision for suspended-sediment concentration computation was evaluated as time averaged relative error (RE) 23%.

본 논문은 군산항의 유사퇴적 현상을 정량적으로 파악하고 그에 합리적인 대책을 마련하는데 활용하기 위해, 잘 알려진 EFDC 3차원 유사이송모형을 기초로 군산항의 퇴적고를 효율적으로 계산하기 위한 EFDC KUNSAN_SEDTRAN MODEL(2012)의 적용성에 대해 고찰하였다. 본 모형은 금강하구수리현상변화조사 보고서(Gunsan Regional Maritime Affairs and Port Office, 2004)의 여러 현장 관측치를 가지고 검정 및 검증을 수행했다. 검정 및 문헌조사를 통해, 본 모형의 점착성토사 침강속도(WS, Settling velocity), 퇴적한계전단응력(TD, Critical deposition stress), 기준침식률(RSE, Reference surface erosion rate), 침식한계전단응력(TE, Critical erosion stress)은 각각 2.2E-04m/s, 0.20 $N/m^2$, $0.003g/s{\cdot}m^2$, 0.40 $N/m^2$으로 확인되었다. 그리고 모형의 적용성을 검토하기 위해, 군산항의 13정점의 퇴적고(71일) 및 내항과 외항 정점의 부유사농도(15일)의 모형 계산치와 현장 관측치를 비교 검토했다. 그 결과 퇴적고 계산을 위한 모형의 적용성은 NSE계수가 0.86, 부유사농도 시간평균 상대오차(RE)가 23%로 평가되었다.

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