Abstract
The relation between the length of a forest road construction and the hauling cost, is become clearer by the simulation of a forest road construction using digital terrain map (DTM). It becomes a very useful method to determine the length and arrangement of a forest road, especially in a logging plan of mountain forest. For, it is insufficient to apply the model of a tractor skidding, as Forest Road Density, to the case of a skyline-logging which is a usual logging method in a mountainous region, because the terrain condition often disturbs the setting up there.
The hauling cost of a skyline-logging that is determined by some conditions-load, maximum tension, clearance, power of yarder, etc., is calculated by the equation (3) which is a function of the skidding distance and felling volume, using DTM. The value of a forest road construction is calculated by equations (1) and (2). Fig. 2 to Fig. 10 show the application of this simulation method. Talking with a computer about the location, we can determine the suitable forest road network according to the purpose of forest road construction.
