Abstract

산사태는 국토 황폐화의 원인인 동시에 국민의 재산과 생명을 위협하는 자연재해이다. 우리나라는 국토의 70% 이상이 산지지형이며 산지에 근접한 주거형태로 인해 산사태의 위험성이 높다. 원주시와 춘천시는, 강원도 지역의 도심지임에도 불구하고, 군사지역을 제외하면 산사태 위험지역에 속한다. 2011년의 경우, 원주시가 여름철 총강우량과 집중호우의 발생횟수가 춘천시보다 많았음에도 불구하고 춘천시에 더 많은 산사태 피해가 발생했다. 이 연구에서는 2010년, 2011년, 2013년 원주시와 춘천시의 산사태 사례를 대상으로 강우패턴과 산사태 발생과의 연관성을 로지스틱 회귀분석을 이용해 분석했다. 그 결과, 두 지역 모두 집중호우가 2시간 연속적으로 관측되었을 때 대부분 산사태가 발생했다. 또한 24시간 누적강우량에 비해 집중호우의 발생이 산사태에 더 민감하게 나타났다. 통계적으로 산사태의 발생 가능성은 집중호우가 연속될 경우에 약 4.64배, 24시간 누적강우량이 증가할수록 약 1.04배로 각각 증가하는 것으로 조사되었다. 이에 따라 두 지역의 집중호우의 연속 관측시간과 24시간 누적강우량이 산사태 발생에 미치는 핵심요인임을 알 수 있었다.Landslide is one of natural disasters that cause land degradation and threaten people s lives and property. In Korea, more than 70% of the land is mountainous, and there is a high risk of landslides due to the residential form close to mountainous areas. Although Wonju-si and Chuncheon-si are urban areas in Gangwon province, except for military areas, they belong to landslide hazard area. In 2011, despite the fact that the total number of severe rain storm and heavy rainfall during summer in Wonju-si was higher than that in Chuncheon-si, more landslide damage occurred in Chuncheon-si. In this study, the correlation between rainfall pattern and landslide occurrence was analyzed using logistic regression analysis for landslide cases of Wonju-si and Chuncheon-si in 2010, 2011 and 2013. As a result, landslides occurred when the severe rain storm was observed continuously for more than 2 hours in both areas. Also, severe rain storm was more sensitive to landslide than 24 hour cumulative rainfall. The possibility of landslide was statistically analyzed to be about 4.64 times when the severe rain storm were continuous and about 1.04 times when the accumulated rainfall of 24 hour increased. Accordingly, it was found that the effects of continuous observation time of severe rain storm and accumulated rainfall of 24 hours on landslide occurrence were important in both areas.

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