Abstract
This study analyzed the characteristics of the disaster occurrence and disaster-prone zones on the 85 forest roads in the Jeollabuk-do area by referring to their forest environment factors. The on-site survey reveal the types of forest road disasters as follows: erosions of cutting slopes 54.1%, erosions of the filling slope 35.3%, collapses of cutting slopes with filling slope 9.4%, and erosions of road surface 1.1%. Disasters most frequently occurred in the vertical location (the hillside) and the horizontal location (the slope), and the forest factors affecting the road disasters were degree of cutting slopes in $31^{\circ}{\sim}40^{\circ}$, degree of filling slopes in $21^{\circ}{\sim}30^{\circ}$, and the soil texture of SiL. The most significant factors on the most frequent occurrence of forest road disasters were forest type of coniferous, slope aspect northeast, forest age of plantation and felling area, and rainfall in 1601~1700. An analysis of the occurrence of the forest road disasters in the Jeollabuk-do area showed a positive correlative relationship with the following factors of the forest environment within a 1% error: degree of cutting slope in $31^{\circ}{\sim}40^{\circ}$, annual accumulation rainfall in 1601~1700. and showed a positive correlative relationship with the following factors of the forest environment within a 5% error: horizontal location of valley, forest type of coniferous, length of slope more than 20 m, forest age of plantation and felling area, soil texture of SiL.
전라북도 임도의 재해발생 및 위험지 85개소를 대상지로 선정하여 강우의 특성 및 다양한 산림환경인자 별로 조사하여 임도재해발생지 및 위험지 특성을 분석하였다. 조사를 통한 임도재해유형은 절토비탈면 붕락 54.1%, 성토비탈면 붕락 35.3%, 절 성토비탈면 복합붕락 9.4%, 노면훼손 1.1%로 나타났다. 위치별로는 종적 위치는 산복부, 횡적 위치는 비탈면부에서 가장 많은 재해가 발생하였다. 임도재해에 영향을 미치는 산림인자별로는 절토비탈면 경사 $31^{\circ}{\sim}40^{\circ}$, 성토비탈면 경사 $21^{\circ}{\sim}30^{\circ}$, 토성은 미사질식양토, 임상은 침엽수림, 비탈면 방향은 북동, 임령은 조림(벌채)지, 연간누적강우 1601~1700 mm에서 가장 많은 재해가 발생되었다. 전라북도 임도재해발생과 산림환경인자와의 상관분석을 실시한 결과 절토비탈면 경사 $31^{\circ}{\sim}40^{\circ}$와 연간누적강우량 1601~1700 mm이 1% 유의수준 내에서 정(+)의 상관관계를 보였다. 횡적 위치로 비탈면, 임상은 침엽수림, 임령은 조림(벌채)지, 비탈면 길이 20 m 이상, 토성 미사질양토 등은 5% 유의수준 내에서 정의 상관관계를 보였다.
