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Analysis of Debris Flow Type in Gangwon Province by Database Construction

DB구축을 통한 강원지역 토석류 유형 분석

  • 전경재 (강릉원주대학교 토목공학과) ;
  • 김기홍 (강릉원주대학교 토목공학과) ;
  • 윤찬영 (강릉원주대학교 토목공학과)
  • Received : 2012.07.12
  • Accepted : 2012.12.26
  • Published : 2013.02.04

Abstract

In recent years in Korea, Typhoon Rusa (2002), Typhoon Maemi (2003), and the localized extreme rainfall followed by Typhoon Ewiniar in 2006 devastated residential areas, roads, and agricultural lands in Gangwon province where 90% of the area is in mountainous regions. Most of the economic losses and casualties were concentrated in the area near the mountain valleys and creeks due to the floods and debris flows. In this study, DATABASE, which includes a total 180 debris flow events in the Gangwon area, was created by collecting the hazard records and field investigations of existing debris flow sites. Analysis results showed that the most of the debris flows in Gangwon province initiated from the small slope failure with relatively steep slope of $18.1^{\circ}$. And they flowed short distances about 420 m in gentle slope with the average angle of $18.1^{\circ}$. In addition, rainfall condition was important for the triggering of debris flow not only at the day of debris flow but also extended period of rainfall before debris flow.

최근 우리나라에서는 2002년 태풍 루사, 2003년 태풍 매미, 2006년 태풍 에위니아와 집중호우로 인하여 산지가 약 90%를 차지하고 있는 강원지역의 주택, 도로, 농지가 큰 피해를 입었다. 이로 인한 경제적 손실과 사망자의 대부분은 홍수와 토석류가 발생된 산지 계곡부와 시내에 집중되었다. 본 연구에서는 기존에 강원지역에서 발생된 토석류 발생지에 대한 현장조사를 실시하여 총 180개소의 토석류에 대한 데이터베이스를 구축하였다. 구축된 자료에 대한 분석결과, 강원지역에서 발생된 토석류는 대부분 소규모 사면파괴로부터 시작하였으며, $34.3^{\circ}$의 비교적 가파른 경사에서 발생하여 평균 $18.1^{\circ}$ 정도의 완만한 경사를 따라 420 m 정도의 비교적 짧은 거리를 이동하는 것으로 나타났다. 또한, 토석류 발생 당일의 강우도 중요하지만 발생 이전의 장기강우가 토석류 발생과 밀접한 관련이 있는 것으로 나타났다.

Keywords

References

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