Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Probable Volcanic Flood of the Cheonji Caldera Lake Triggered by Volcanic Eruption of Mt. Baekdusan

백두산 화산분화로 인해 천지에서 발생 가능한 화산홍수

  • Lee, Khil-Ha (Department of Civil Engineering, Daegu University) ;
  • Kim, Sung-Wook (Gi Co. Ltd.) ;
  • Yoo, Soon-Young (Division of Computational Sciences in Mathematics, National Institute of Mathematical Sciences) ;
  • Kim, Sang-Hyun (Department of Civil and Environmental Engineering, Pusan National University)
  • 이길하 (대구대학교 토목공학과) ;
  • 김성욱 (주식회사 GI) ;
  • 유순영 (국가수리과학연구소 계산수학연구부) ;
  • 김상현 (부산대학교 사회환경시스템공학부)
  • Received : 2013.09.23
  • Accepted : 2013.10.21
  • Published : 2013.10.31
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Abstract

The historical accounts and materials about the eruption of Mt. Baekdusan as observed by the geological survey is now showing some signs of waking from a long slumber. As a response of the volcanic eruption of Mt. Baekdusan, water release may occur from the stored water in Lake Cheonjii caldera. The volcanic flood is crucial in that it has huge potential energy that can destruct all kinds of man-made structures and that its velocity can reach up to 100 km $hr^{-1}$ to cover hundreds of kilometers of downstream of Lake Cheonji. The ultimate goal of the study is to estimate the level of damage caused by the volcanic flood of Lake Cheon-Ji caldera. As a preliminary study a scenario-based numerical analysis is performed to build hydrographs as a function of time. The analysis is performed for each scenario (breach, magma uplift, combination of uplift and breach, formation of precipitation etc.) and the parameters to require a model structure is chosen on the basis of the historic records of other volcanos. This study only considers the amount of water at the rim site as a function of time for the estimation whereas the downstream routing process is not considered in this study.

최근 백두산의 재분화 문제가 하나의 중요한 지구과학적 문제로 부상하고 있다. 백두산과 같이 대규모 칼데라 호수를 갖고 있는 화산의 폭발은 단순히 화산분출뿐만 아니라 칼테라 호수에 저장된 물의 유출로 인해 큰 재해를 유발할 수 있어 연구가 필요하다. 대형 화산성 홍수는 모든 종류의 인공 구조물을 파괴할 수 있는 에너지를 가지고 있고, 유속이 100 km $hr^{-1}$에 달하며, 도달거리가 수 백 km까지 이르기 때문에 치명적인 피해를 가져올 수 있다. 연구의 최종목표는 백두산의 지질과 지반 조건에서 분화 시 예상되는 화산성 홍수의 피해를 예측하는 것이다. 하나의 사전 연구로서 백두산 화산이 분출되면서 천지에 저장된 물이 방류될 경우를 가정한 유량곡선 시나리오에 근거하여 수치해석을 실시하였다. 각각의 시나리오 별(림 붕괴, 단순융기, 림 붕괴와 융기의 조합, 강우형성 등)로 시간의 함수로서 유량변화를 이끌어내기 위해 선행 연구를 바탕으로 백두산 천지 유출 모형을 전개하였다. 천지에서 마그마 융기와 림 붕괴가 동시에 발생하면 최고 유량이 25,000 $m^3s^{-1}$에 이르러 백두산 천지의 화산홍수가 주변 지역에 심각한 자연재해를 가져올 수 있는 것으로 보인다. 이 연구에서는 저수지의 물이 방류되는 순간유량곡선에 치중하였으며 천지 유량 방출 후 하류 하천 하도 추적은 다루지 않았다.

Keywords

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