Journal of agriculture & life science (농업생명과학연구)

Institute of Agriculture & Life Science, Gyeongsang National University (경상대학교 농업생명과학연구원)
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Analysis of Debris Flow Characteristics in Bongwha Area Gyeongsangbuk-do, Korea

경상북도 봉화지역의 토석류발생 특성분석

  • Ma, Ho-Seop (Division of Forest Science(Insti. of Agric. Life Science), Gyeongsang Nat'l Univ.) ;
  • Lee, Sung-Jae (Seoul National University Forest)
  • 마호섭 (경상대학교 환경산림과학부(농업생명과학연구원)) ;
  • 이성재 (서울대학교 농업생명과학대학 학술림)
  • Received : 2017.10.11
  • Accepted : 2017.11.12
  • Published : 2018.02.28
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Abstract

This study was carried out to analyze the characteristics of debris flows, and the effects of forest environmental factors on debris flow that occurred in Bonghwa-gun located in Gyeongsangbuk-do province in Korea. The results obtained from this study are summarized as follows: The total number of debris flows that occurred was 40; the average area of debris flow was $1,614.1m^2$; the average sediment volume of debris flows was $2,450m^3$; the average length of the debris flows was 120.7 m, and average width was 11.8 m. The debris flows highly occurred in areas having slope gradient($<41^{\circ}$), slope gradient(NW), vertical slope(complex),cross slope(concave), altitude(401~500 m), forest type(coniferous), parent rock(metamorphic), stream order(0 order), position(middle), forest type(artificial forest), tree height(<11 m), and DBH(<17 cm), as well as in areas of igneous rocks. Correlation analysis between debris flow length with environmental factors showed that variables such as slope gradient($31{\sim}40^{\circ}$), vertical slope(complex), cross slope(concave) had positive correlation with debris flow length and was statistically significant at 1% level, whereas slope gradient($<41^{\circ}$), and vertical slope(straight) had negative correlation at 1% level.

경상북도 봉화군 토석류 발생지 40개소를 대상지로 선정하여 강우의 특성 및 다양한 산림환경인자 별로 조사하여 토석류발생 특성을 분석하였다. 토석류 발생 수는 총 40개소였으며, 토석류 발생 평균 발생면적은 $1,614.1m^2$, 평균 발생토사량은 $2,450m^3$, 평균 길이는 120.7m, 평균 폭 11.8m로 나타났다. 토석류가 비교적 많이 발생한 산림환경인자는 사면경사도($41^{\circ}$이상), 북서사면, 해발(401m~500m 이하), 종단사면(복합), 횡단사면(오목), 침엽수, 변성암, 하천차수는(0차), 사면위치(산복), 임종(인공림), 수고(11m~15m), 흉고직경은 중경목(17cm 이상)에서 나타났다. 토석류 발생길이와 산림환경인자와의 상관분석을 실시한 결과는 사면경사($31^{\circ}{\sim}40^{\circ}$), 종단사면(복합) 횡단사면(오목) 에서 1% 수준 내에서 정의 상관관계를 보였고, 사면경사($41^{\circ}$이상), 종단사면(직선)에서 1% 수준 내에서 부의 상관관계를 보였다.

Keywords

Acknowledgement

Supported by : 산림청

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