Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Application of LAHARZ for Lahar Modeling in Mt. Baekdusan

백두산 분화로 인한 화산이류 모델링를 위한 LAHARZ의 적용 연구

  • Jung, Kwang-Jun (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Kim, Hyun-Jun (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Kim, Sang-Hyun (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Lee, Khil-Ha (Department of Civil Engineering, Daegu University)
  • 정광준 (부산대학교 사회환경시스템공학부) ;
  • 김현준 (부산대학교 사회환경시스템공학부) ;
  • 김상현 (부산대학교 사회환경시스템공학부) ;
  • 이길하 (대구대학교 토목공학과)
  • Received : 2013.09.23
  • Accepted : 2013.10.10
  • Published : 2013.10.31
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Abstract

Recent reports about Mt. Baekdusan indicate an increasing potential of lahar generation due to volcanic activity around Lake Cheonji. In this study, we model lahar assuming volcanic activity underneath the caldera located at the top of Mt. Baekdusan. Lahar-inundation hazard zones (LAHARZ), software that runs within a Geographic Information System (GIS), was used for lahar modeling in various conditions of digital terrain resolution and model parameters. The sensitivity analysis of model parameters shows that both sink threshold and terrain resolution have limited impact on the modeling result. Combinations of stream threshold and resolution indicate distinctive distributions in stream delineation. The limitations of LAHARZ seem to largely be associated with the assumption of an existing flow generation algorithm. However, the impact of different resolutions on the final lahar extent was found to be small.

백두산은 정상부에 천지가 존재하는 잠재적인 활화산으로 최근 화산활동 분화와 관련된 화산이류 발생가능성에 대한 우려가 높아지고 있다. 본 연구에서는 백두산 정상부의 칼데라 호수 지점의 분화를 가정한 화산이류의 모델링을 수행하였다. LAHARZ를 적용한 본 연구는 다른 해상도의 수치지형모형을 구동모형의 매개변수를 변화시키며 분화로 야기된 다양한 상황의 화산이류 발생 영향을 검토하였다. 매개변수의 민감도 해석은 움푹 패인 곳(sink)을 정의하는 한계치와 수치지형모형의 해상도가 화산이류의 모델링 결과에 주는 영향이 제한적이라는 결과를 보여주었고, 하천격자의 도출을 위한 한계치와 수치모형의 해상도는 하천격자의 공간적 분포에 상대적으로 민감한 결과를 보여주었다. 또한 LAHARZ가 가지고 있는 문제가 흐름 발생 알고리즘 자체의 한계에 기인하는 것을 확인하였다. 한편, 상이한 수치지형 모형의 해상도가 화산이류의 최종 모델링결과에 미치는 영향은 제한적으로 나타났다.

Keywords

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