Abstract
We analyzed the relationship between the location of anchor points for H-type cable systems and the terrain factors related to slope failure potential. Slope failure potential is one indicator of the suitability of a terrain for a forest road network that connects effective anchor points. To determine such effective anchor points for H-type cable systems on a digital terrain map, we used a pair of skylines representative of those that have been rigged up for H-type cable systems in recent years. The height of the loading blocks was based on a temporary operation method that roughly ensures safety of the skylines by limiting tension of the lifting lines, the practicability of which we confirmed in this paper. Results of the analysis showed that slope failure potentials at the selected anchor points were significantly lower than at other points. At the selected anchor points, significant terrain factors that decrease slope failure potential were as follows: cross-section of slopes, turning point of inclination, catchment area, and their interactions. However, slope inclination at the selected anchor points was significantly larger than at the other points (a large slope inclination increases slope failure potential).
