Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Case Analysis of Volcanic Ash Dispersion under Various Volcanic Explosivity Index of the Mt. Baegdu

백두산 분화 강도에 따른 화산재 확산 사례 분석

  • Lee, Soon-Hwan (Institute of Environment Studies, Pusan National University) ;
  • Jang, Eun-Suk (Faculty of Engineering, Hanzhong University) ;
  • Lee, Hyun-Mi (Department of Atmospheric Environment, Pusan National University)
  • Received : 2012.05.22
  • Accepted : 2012.06.25
  • Published : 2012.06.30
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Abstract

In order to clarify the characteristics of dispersion of volcanic tephra emitted from the Mt. Baegdu with various eruption environment, numerical analysis were performed using numerical models, Weather Research and Forecast (WRF) and FLEXPART. Synoptic conditions at 12 October 2010 was adopted because the volcanic ash of Mt. Baegdu can reach the Korean peninsula and its dispersion pattern was compared with different Volcanic Explosivity Index (VEI) and particle size. Predominant size of falling out ash flowing in the peninsular is smaller than 0.5 mm and the ash large than the size is difficult to get in the peninsular due to the its weak ability of truculent diffusion. the difference of ash distribution with various VEI scenarios is not so much but number density of ash in the air is dramatically changed. Volcanic ash tends to be deposited easily in eastern coastal area such as Gangneung and Busan, because of the inflow of ash from East Sea and barrier effect of the Taeback mountains along the east coast of the Korean Peninsula. Accumulated amount of ash deposition can be increased in short period in several urban areas.

다양한 지질학적 분화 강도에 따른 백두산 화산분출물의 확산 특성과 이들 분출물이 한반도에 미치는 영향을 분석하기 위하여 대기역학모형 WRF (Weather Research and Forecasting)와 확산모형 FLEXPART를 이용하여 수치실험을 실시하였다. 연구 대상일은 화산재 유입이 예상되는 2010년 10월 21일의 종관장이며, 방출 후 48시간 동안 화산재의 이동을 분석하였다. 백두산 분화 후 한반도에 유입되는 강하화산재의 크기는 0.05 mm 이하가 대부분을 차지하며, 큰 입자는 확산에 의한 이동이 작기 때문에 유입가능성이 크지 않았다. 분화강도에 따른 화산재의 이동 특성을 보면, 분화강도 차이에 따른 입자의 분포도의 차이는 크지 않으나, 수밀도의 차이는 크게 나타났다. 한반도 내 도시별 화산재의 침적량 분석에서 화산재가 기류를 타고 동해에서 유입되고 태백산맥의 차폐효과에 의하여 한반도 동쪽에 위치한 강릉, 부산의 침적량이 초기에 증가하는 경향을 나타내며, 지역별 침적량은 일시에 급격하게 증가할 수 있다.

Keywords

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