The Analysis of Relationships between Road Alignment and Terrain Conditions for National Forest Road

국유림도(國有林道)의 노선선형(路線線形)과 지형(地形)과의 관계분석(關係分析)

This study was conducted to investigate the characteristics of the road alignment, correlations among evaluation factors of the alingment, and the relationships between the evaluation factors and terrain factors for the forest road of five National Forest Offices. The results were as follows : 1. The elongation coefficients(${\eta}$) of forest road in Kangnung and Wonju National Forest Office were ranged 0.3~0.5, and those of Andong, Namwon, and Kongju National Forest Offices were ranged 0.2~0.3 in straight line of 100m, 200m, and 300m. 2. Three different types of plane alignment were identified for Kangnung and Wonju National Forest Offices, Namwon and Kongju National Forest Offices, Andong National Forest Office. However, longitudinal alignment for five National Forest Offices tended to be similar conditions. 3. Low correlation coefficients were calculated in the relation between elongation coefficients(${\eta}$) and evaluation factors of plane alignment(curve length ratio(%), sum of inverse number of each curve radius(m/km), and sum of each intersection angle($^{\circ}/km$)) for three straight lines. On the contrary, high correlation coefficients were obtained among the relations of curve length ratio(%), sum of inverse number of each curve radius(m/km), and sum of each intersection angle($^{\circ}/km$). 4. Slope(%) were closely correlated with plane alignment, and so were the relationships between frequency of valleys and streams(No./km) and elongation coefficients(${\eta}$) of forest road.

본 연구는 5개 영림서(원주, 강릉, 안동, 남원, 공주영림서)의 국유림도(國有林道)를 대상으로 임도노선선형(林道路線線形)의 특성을 파악함과 동시에 노선선형의 평가치간의 관계, 평가치와 지형과의 관계 등에 대해서 검토하였다. 그 결과는 다음과 같다. 1. 임도우회율(林道迂廻率)은 강릉영림서 및 원주영림서가 직선거리 100m, 200m 및 300m에서 0.3~0.5, 안동, 남원 및 공주영림서는 0.2~0.3으로 나타났다. 2. 평면선형(平面線形)은 강릉과 원주영림서, 남원과 공주영림서 및 안동영림서가 각각 다른 3개 유형으로, 종단선형(縱斷線形)은 전 영림서가 유사한 경향으로 나타났다. 3. 임도노선선형(林道路線線形)의 평가치간의 관계에서 직선거리에 대한 임도우회율 및 평면선형 평가치(곡선장률, 곡선반경의 역수의 합 및 교각의 합)의 상관관계는 낮게, 평면선형(平面線形)의 평가치간의 상관관계는 높게 산출되었다. 4. 임도노선선형(林道路線線形)과 지형(地形)과의 관계에서 경사는 평면선형과, 곡빈도는 임도우회율과 밀접한 관계를 보여 주었다.