Influence of terrain conditions on forestry road construction on ridges(<SPECIAL ISSUE>FOREST ROADS NETWORK)

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  • 稜線部への路線開設における地形条件の影響(<特集>「路網」)
  • Influence of terrain conditions on forestry road construction on ridges

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This paper examines the terrain conditions required for constructing a road on a ridge. The study areas included Kisodani, which had been investigated in the previous report, as well as the Iwaki and Tenryu Forest Planning Areas. Overall, ridge roads tend to be constructed in regions where the road density is high; this is because in mountainous areas, roads are constructed first at lower elevations and subsequently at higher elevations. In this manner, it is possible to reach a ridge by constructing a large number of roads. Our analysis showed that as the severity of terrain conditions such as slope angle, skewness of the slope angle distribution, relative height, and valley density increased, fewer roads were constructed on ridges. The conditions below some values had a slight influence on construction, but they had a greater effect on the maximum limiting values; for the slope angle, this was 20°, and for the relative height, it ranged approximately from 1,250 to 1,500m. There are hardly any ridge road constructions in regions with such terrain conditions. However in some regions, ridge roads have been constructed despite the steepness of the slopes. We believe that such roads were constructed by extending the roads from the neighboring basin across the ridge. It appears to be efficient to construct ridge roads in this way in regions which have severe terrain conditions.

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