The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Lahar Simulation on Ulleung Island Using Laharz_py Program

Laharz_py 프로그램을 이용한 울릉도 라하르 수치모의

  • Chang, Cheolwoo (Department of Earth Science, Pusan National University) ;
  • Yun, Sung-Hyo (Department of Earth Science Education, Pusan National University)
  • Received : 2017.03.15
  • Accepted : 2017.03.26
  • Published : 2017.03.31
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Abstract

A Lahar on the volcanic area is one of the important hazard that can cause the loss of life and property damage. In order to estimate lahar hazard area at Ulleung Island, we simulated lahar inundation area using Laharz_py. We assumed 400 m of additional elevation for DEM to draw proximal hazard zone of Ulleung Island that H/L ratio were selected 0.45 and 0.5. And lahar volumes for simulation were estimated to 30,000, 50,000, 70,000, $100,000m^3$, respectively. In the results, 5 streams are located near a proximal hazard zone, Jeodong (east), Sadong and Okchon (southeast), Namyang (southwest), and Chusan (north), Nari basin is also considered that has a possibility of lahar during downpour. The results of this study can be used as basic data to make a hazard map for reduce the damage that can be caused by volcanic hazards occurred on Ulleung Island.

화산지역에서 발생하는 라하르는 인명과 재산피해를 일으키는 주요 재해이다. 라하르 위험 지역을 산출하기 위하여 본 연구에서는 Laharz_py 프로그램을 사용하여 울릉도에서 발생 가능한 라하르의 영향 지역에 대한 수치모의를 실시하였다. 울릉도의 근위위험지역을 도출하기 위하여 DEM에 400 m의 추가고도를 설정하였고, 이에 따라 H/L비는 0.45와 0.5로 결정하였다. 발생 가능한 라하르의 부피는 30,000, 50,000, 70,000, $100,000m^3$로 설정하였다. 근위위험지역 경계와 인접하여 라하르의 발생 가능성이 있는 하천은 울릉도 동쪽 저동천, 남동쪽 사동천과 옥천천, 남서쪽의 남양천, 북쪽의 용출수인 추산천이며, 집중호우시 나리 분지에서의 라하르 발생 가능성도 고려하여 수치모의를 실시하였다. 본 연구는 울릉도에서 발생 가능한 라하르의 영향 범위에 대한 예측을 통해 화산재해로 인한 인명과 재산 피해를 줄일 수 있도록 재해위험지도를 작성하기 위한 기본 자료로 활용 가능할 것이다.

Keywords

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