Journal of agriculture & life science (농업생명과학연구)

Institute of Agriculture & Life Science, Gyeongsang National University (경상대학교 농업생명과학연구원)
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Effects of Forest Environmental Factors on the Sediment Disaster Occurrence

산지토사재해 발생에 있어서 산림환경인자의 영향

  • Ma, Ho-Seop (Department of Forest Environmental Resources, Gyeongsang Nat'l Univ.(Insti. of Agri. & Life Science)) ;
  • Kang, Won-Seok (Department of Forest Environmental Resources, Gyeongsang Nat'l Univ.(Insti. of Agri. & Life Science)) ;
  • Lee, Sung-Jae (Seoul National University Forest)
  • 마호섭 (경상대학교 산림환경자원학과(농업생명과학연구원)) ;
  • 강원석 (경상대학교 산림환경자원학과(농업생명과학연구원)) ;
  • 이성재 (서울대학교 농업생명과학대학 학술림)
  • Received : 2014.06.11
  • Accepted : 2014.08.10
  • Published : 2014.08.31
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Abstract

This study was carried out to analyze the contribution of each environmental factors on sediment disaster. The results obtained from this study are summarized as follows. The relationship between landslide area and environmental factors was a positive correlation with cross slope (convex), position (upper), altitude (501m), forest type (coniferous), parent rock (sedimentary rock), D.B.H. (over 17cm), but was negative correlation with slope gradient ($31{\sim}40^{\circ}$), parent rock (igneous rock), D.B.H. (6~16cm). From a stepwise regression analysis between the landslide area($m^2$) and environmental factors, the factors strongly affecting the landslide areat($m^2$) were the parent rock (metamorphic rock), cross slope(complex), coniferous forests(forest type), landslide type(linear), landslide type(arborescence) and (slope gradient) > ($41^{\circ}$. Therefore, the results from this study will be used for judgement of dangerous slope.

본 연구는 산림환경인자에 의한 산사태 발생 면적에 영향을 미치는 인자를 규명하고, 각 인자의 기여도를 분석한 결과를 요약하면 다음과 같다. 산사태 발생면적에 영향을 미치는 인자는 횡단사면(볼록), 사면위치(산정), 표고(501m 이상), 임상(침엽수), 모암(퇴적암), 흉고직경(17 cm이상)과는 1% 유의수준 내에서 정의 상관관계를 보였고, 경사($31{\sim}40^{\circ}$), 모암(화성암), 흉고직경(6~16 cm)에서 1% 유의수준 내에서 부의 상관관계를 보였다. 단계별 회귀분석에 의한 각 인자별 산사태 발생면적에 영향을 미치는 요인은 횡단사면(복합), 임상(침엽수), 산사태유형(선상), 산사태유형(수지상), 경사($41^{\circ}$ 이상)순으로 도입되었다. 각종 산림환경인자에 의한 산사태 발생지의 면적에 대한 추정식은 Y = -735.023 + 1279.313(모암 변성암) + 1516.034(횡단복합사면) + 1197.353(침엽수림) + 1256.279(산사태유형 선상) + 1123.392(산사태 유형 수지상) + 1514.565 (경사 $41^{\circ}$ 이상)로 도출되었다. 따라서 본 모델에 의해 계산된 산사태 발생 예측치를 비교 분석한 결과 보다 안정적인 모델로 평가되어 지역적인 산사태 발생면적의 예측에 유용하게 사용할 수 있을 것으로 판단된다.

Keywords

Acknowledgement

Supported by : 산림청

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