Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Analysis of Influence for Breach Flow According to Asymmetry of Breach Cross-section

제방붕괴 형상의 비대칭성에 따른 붕괴흐름의 영향 분석

  • Kim, Sooyoung (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Choi, Seo-hye (School of Urban and Civil Engineering, Hongik University) ;
  • Lee, Seung Oh (School of Urban and Civil Engineering, Hongik University)
  • 김수영 (한국건설기술연구원 수자원.하천연구소) ;
  • 최서혜 (홍익대학교 건설.도시공학부) ;
  • 이승오 (홍익대학교 건설.도시공학부)
  • Received : 2016.02.01
  • Accepted : 2016.03.12
  • Published : 2016.05.31
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Abstract

The risk of collapse in hydraulic structures has become more elevated, due to the increased probability and scale of flooding caused by global warming and the resulting abnormal climatic conditions. When a levee, a typical hydraulic structure, breaks, an enormous breach flow pours into the floodplain and much flood damage then occurs. It is important to accurately calculate the breach discharge in order to predict this damage. In this study, the variation of the breach discharge with the asymmetry in the cross-section of the levee breach was analyzed. Through hydraulic experiments, the cross-section of the breach was analyzed during the collapse using the BASD (Bilateral ASymmetry Degree), which was developed to measure the degree of asymmetry. The relationship of the breach discharge was identified using the BASD. Additionally, the variation of the breach flow measured by the BASD was investigated through a 3-D numerical analysis under the same flow conditions as those in the experiment. It was found that the assumption of a rectangular breach cross-section, which is generally used for the estimation of the inundation area, can cause the breach discharge to be overestimated. According to the BASD, the breach flow is decreased by the interference effect in the breach section of the levee. If the breach flow is calculated while considering the BASD in the numerical analysis of the flooding, it is expected that the predicted inundation area can be estimated accurately.

지구온난화 및 이상기후의 영향으로 극한홍수의 발생확률 및 규모가 증가함에 따라 수공구조물의 붕괴위험도 함께 증가하고 있다. 대표적인 수공구조물인 제방의 붕괴 시 막대한 붕괴유량이 제내지로 유입되어 많은 침수피해를 발생시킨다. 이러한 피해를 예측하기 위해 붕괴유량을 정확히 파악하는 것이 중요하다. 본 연구에서는 제방붕괴단면의 비대칭성에 따른 붕괴유량의 변화를 분석하였다. 수리실험결과를 통해 제방의 붕괴가 진행됨에 따라 붕괴단면의 비대칭성이 어떻게 변화하는지 BASD를 계산하여 분석하였다. 그 결과, 붕괴유량과 BASD의 관계를 도출할 수 있었다. 또한, 3차원 수치모의를 통해 동일한 조건하에서 붕괴단면의 비대칭성에 따른 붕괴유량의 차이를 비교하였다. 이는 기존에 침수면적을 예측하기 위해 사용한 붕괴단면의 직사각형 가정은 붕괴유량이 과다하게 산정됨을 알 수 있었고 붕괴단면의 BASD에 따라 붕괴부에서 간섭현상이 발생하여 붕괴유량이 감소하는 것으로 나타났다. 범람 수치모의 시 제방붕괴 단면의 BASD를 고려하여 보다 정확한 붕괴유량을 산정한다면 정확한 예상침수면적을 도출할 수 있을 것으로 기대된다.

Keywords

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