Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Flood inundation analysis resulting from two parallel reservoirs' failure

병렬로 위치한 2개 저수지 붕괴에 따른 홍수범람 해석

  • Kim, Byunghyun (Institute for Disaster Prevention, Kyungpook National University) ;
  • Han, Kun Yeun (Department of Civil Engineering, Kyungpook National University)
  • Received : 2015.11.09
  • Accepted : 2015.12.24
  • Published : 2016.02.29
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Abstract

The DAMBRK is applied to Janghyeon and Dongmak reservoirs in Namdaecheon basin, where two reservoirs were failed due to Typhoon Rusa in 2002. Relaxation scheme is added to DAMBRK to consider the tributary cross-section because two reservoirs are in tributary valleys. In addition, this study suggests the method to utilize the reservoir breach formation time of ASDSO (2005) and empirical formulas for peak break outflow from dam to reduce the uncertainty of reservoir breach formulation time. The single break of Janghyeon reservoir and consecutive break of Janghyeon and Dongmak reservoirs with the suggested method are considered. While the breach discharge from reservoirs rushes down, the discharge and water surface elevation along the river are predicted, and the predictions show the attenuation phenomena of reservoir break floodwave. The applicability of the model is validated by comparing the predicted height with field surveyed data, and showing good agreements between predictions and measurements.

본 연구에서는 DAMBRK 모형을 2002년 태풍 루사로 인해 붕괴된 남대천 유역의 장현저수지와 동막저수지에 적용하여 붕괴상황을 재현하였다. 두 저수지는 병렬로 위치하고 있으며, 이 두 저수지의 붕괴 모의를 위해 Relaxation 기법을 DAMBRK 모형에 추가하였다. 그리고 ASDSO (2005)에서 제안한 흙댐 붕괴지속시간과 첨두붕괴유량 산정을 위한 Froehlich 등의 경험공식을 활용한 저수지의 붕괴지속시간 추정 방법을 제안하였다. 제안 방법으로 선정된 붕괴지속시간으로 장현저수지 단일붕괴와 장현 및 동막저수지 연속붕괴에 대해 적용하여 붕괴유출 수문곡선을 계산하였다. 계산된 붕괴유량이 하류로 전파하면서 예상되는 홍수량 및 홍수위를 주요 하도지점에서 계산하고, 유량이 감쇠되는 특성을 해석하였다. 그리고 계산 홍수위와 현장 조사된 홍수위와의 비교를 통해 적용 모형의 매개변수 및 정확성을 검증하였다.

Keywords

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