Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Influences of Cumulative Number of Days of Rainfall on Occurrence of Landslide

강우량의 누적일수가 산사태 발생에 미치는 영향

  • Kang, Won-Seok (Division of Forest Restoration, National Institute of Forest Science) ;
  • Ma, Ho-Seop (Department of Forest Environmental Resources (Institute of Agriculture and Life Science), Gyeongsang National University) ;
  • Jeon, Kwon-Suk (Forest Medicinal Resources Research Center, National Institute of Forest Science)
  • 강원석 (국립산림과학원 산림복원연구과) ;
  • 마호섭 (경상대학교 산림환경자원학과(농업생명과학연구원)) ;
  • 전권석 (국립산림과학원 산림약용자원연구소)
  • Received : 2015.08.10
  • Accepted : 2016.05.22
  • Published : 2016.06.30
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Abstract

In relation to the impact of cumulative rainfall on landslides in accordance with the cumulative number of days, for the more than 100 mm rainfall, the 3 days cumulative rainfall experienced 64.9% of the total points, which is 986 points out of the 1520 points. The 5 days cumulative rainfall period experienced 60% of the total landslides, which is 846 points out of 1520 points analyzed. The 3 days or 5 days cumulative rainfall thus had a greater effect on landslides than the other days. In addition, for the 101-200 mm rainfall, more landslides occurred in the 10 days cumulative number of days, for the 201-300 mm, more landslides occurred in the 14 days cumulative number of days, whereas the 18 days cumulative number of days had more landslides for the 301-400 mm rainfall. Thus, it is imperative to take into consideration cumulative rainfall and the cumulative number of days of rainfall in the establishment of forecasting and warning systems for landslides, to minimize the damage caused to life and property by landslides.

본 연구에서는 산사태 발생 전 강우량의 특성과 누적 강우일수에 의한 누적강우량 분석을 통하여 산사태 발생에 미치는 누적강우량의 영향을 제시하였다. 산사태가 발생한 1520개소의 자료를 중심으로 산사태 발생 20일전까지 일강우량의 평균값은 1일전이 52.9 mm로 가장 많은 양을 보였고, 2일전이 22.8 mm, 6일전이 21.9 mm 순으로 나타났다. 누적 일수에 따른 누적강우량과 산사태 발생과의 관계에서 100 mm이하에서는 누적일수 3일을 기점으로 전체 1520개소 중 64.9%인 986개소가 발생하였다. 누적일수 5일은 전체 1520개소 중 60%인 846개소에서 발생하고 있어 3일이나 5일정도 누적된 강우량이 산사태 발생에 미치는 영향이 큰 시점으로 나타났다. 그러나 누적일수가 늘어남에 따라 누적강우량도 증가하지만 산사태 발생건수는 줄어드는 것으로 나타났다. 또한, 101-200 mm에서는 10일, 201-300 mm에서는 14일, 301-400 mm에서는 18일 누적일수가 산사태 발생에 많은 기여를 하는 것으로 나타나 누적일수에 따른 산사태 예보 및 경보기준을 마련하여 인명 및 재산상의 피해를 최소화해야 할 필요성이 있을 것으로 생각된다.

Keywords

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