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

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Analysis of Breach Mitigation Effect on Levee made with New Substance by Overtopping

신소재 활용 제방의 월류 붕괴 경감 효과 분석

  • Ko, Dong-Woo (River Experiment Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Kang, Joon-Gu (River Experiment Center, Korea Institute of Civil Engineering and Building Technology)
  • 고동우 (한국건설기술연구원 하천실험센터) ;
  • 강준구 (한국건설기술연구원 하천실험센터)
  • Received : 2017.11.06
  • Accepted : 2018.02.02
  • Published : 2018.02.28
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Abstract

Levee breaches can result from flooding due to torrential rainfalls, which are linked with recent abnormal climates and the aging of river levees. Breaches have caused enormous property damage and human casualties in lowland areas. Overtopping was found to be the cause for approximately 40% of all cases of breach. In this study, the reasons and mechanisms behind levee breaches were analyzed using hydraulic model testing. The overtopping stability and time delay effect of breaches were assessed for levees made with a new environmentally friendly substance. Image analysis revealed that the total breach time of the levees made with the new substance was about 2.25 times greater than that of an earthen levee. The initial breach rate of a general earthen levee was about 1.43 times higher than that of levees covered with the new substance, and the body collapsed rapidly. The breach mechanisms of levees covered with the new substance were completely different, and it is possible to prevent rapid breaches by mitigation of the breach speed on the slope by resisting overtopping.

최근 전 세계적으로 이상기후에 따른 국지성 폭우로 인한 홍수 발생과 하천제방의 노후화로 인하여 제방이 소실되고 저지대에서의 엄청난 재산 피해 및 인명 피해가 발생되고 있다. 특히 월류에 의한 제방붕괴는 약 40%에 달하는 것으로 보고되고 있다. 본 연구는 월류에 의한 제방붕괴의 원인 및 메커니즘을 파악하기 위해 수리모형실험을 수행하였고 제방의 내구성 향상을 위한 친환경 신소재인 바이오폴리머를 이용하여 월류에 따른 제방사면의 안정성 및 붕괴지연효과 등을 평가하였다. 영상계측장치를 이용한 실험분석 결과, 제방사면에 신소재 적용 시 총 제방붕괴시간은 흙 제방과 비교했을 때 약 2.25배의 차이를 보였고 신소재가 적용되지 않은 흙 제방의 경우 초기 붕괴발달속도가 약 1.43배 빠르게 나타났으며 시간이 지날수록 제체가 급격하게 붕괴되는 것을 관찰할 수 있었다. 또한 신소재 적용 제방의 붕괴메커니즘은 흙 제방에 비해 확연히 다르게 나타났으며 월류 흐름에 저항하여 사면침식속도를 경감시킴으로써 급격한 제체붕괴 예방이 가능한 것으로 평가되었다.

Keywords

References

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