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Monte Carlo 모의 및 수치해석 모형을 활용한 하천 유량 추정기법의 개발
강한솔,안현욱,김연수,허영택,노준우,Kang, Hansol,An, Hyunuk,Kim, Yeonsu,Hur, Youngteck,Noh, Joonwoo 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.4
Since the frequency of heavy rainfall is increasing due to climate change, water levels in the river exceed past historical records. The rating-curve is to convert water level into flow dicscharge from the regression analysis of the water level and corresponding flow discharges. However, the rating-curve involves many uncertainties because of the limited data especially when observed water level exceed past historical water levels. In order to compensate for insufficient data and increase the accuracy of flow discharge data, this study estimates the flow discharge in the river computed mathematically using Monte Carlo simulation based on a 1D hydrodynamic numerical model. Based on the existing rating curve, a random combination of coefficients constituting the rating-curve creates a number of virtual rating curve. From the computed results of the hydrodynamic model, it is possible to estimate flow discharge which reproduces best fit to the observed water level. Based on the statistical evaluation of these samples, a method for mathematically estimating the water level and flow discharge of all cross sections is porposed. The proposed methodology is applied to the junction of Yochoen Stream in the Seomjin River. As a result, it is confirmed that the water level reproducibility was greatly improved. Also, the water level and flow discharge can be calculated mathematically when the proposed method is applied.
노준우,이경수,허영택,김영성,Noh. Joonwoo,Lee. Kyungsu,Hur. Youngteck,Kim. Youngsung 한국방재학회 2014 한국방재학회논문집 Vol.14 No.4
본 연구에서는 파키스탄 파트린스 저수지를 대상으로 상류유입 유량, 유사 및 수문 운영에 따른 장기 퇴적양상을 EFDC 3차원 모형을 이용하여 모의하고 배사문 운영에 의한 배사효과를 분석하였다. 5년 동안 모의한 결과 플러싱을 실시하지 않은 경우 저수지 유심부의 퇴적이 약 10 m에 달하였으나 최대유량 직후 플러싱을 시행함으로써 배사문을 통한 퇴적토 배출이 가능함을 알 수 있었다. 플러싱을 시행하면 배사수로가 형성되고 형성된 수로를 따라서 배사가 활발히 이루어지는 것으로 모의되었고 이는 기존 저수지 배사의 물리적 특성을 잘 반영하는 것으로 판단된다. 모의결과로부터 취수구 전단부에서의 입도분포와 특정입경을 가지는 유사의 도달여부 등 다양한 정보를 얻을 수 있었으며 향후 저수지 운영에 필요한 기초자료로 활용도가 높을 것으로 기대된다. This paper presented long-term reservoir sedimentation in the Patrind Reservoir of Pakistan and evaluation of the sediment flushing based on the gate operation corresponding to the upstream discharge and sediment inflow using EFDC 3 dimensional hydrodynamic model. Simulated for five years, the invert level in the middle reach of the reservoir increased up to 10m without flushing, while 5 days flushing after the peak flow in each year contributes to release accumulated sediment through flushing gate. Sediment flushing occurs mainly through the channel formulated during flushing operation. From the results of EFDC simulation it is possible to estimate the fraction of the particle size distribution which exceed 0.2 mm deposited in front of the intake facility since it is known to result in significant turbine damage. The results of this study will contribute to establish a sound reservoir operation plan considering efficient sediment management.