A Study on the Planning Method for Arborescent and Circular Forest Road Networks in Private Forest(<Special Issue>Multipurpose Forest Management)

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In this study, the forest road network planning method for combining the arborescent forest road network and the circular forest road network was examined, and the road network planning program was made. First, the developed planning method for the forest road network selected the target sub-compartment which had the most benefits among sub-compartments. The benefits were calculated from the species, forest ages, yield tables, and log prices. After selecting the target sub-compartment, it determined an attainment point that is a terminal point of the arborescent forest road in the target sub-compartment. The target attainment point was the point to which the total distance from all grids in the target sub-compartment was minimized. Also, it determined the route of the forest road from the existing road to the target sub-compartment, using the Dijkstra method to minimize earth-work costs, where the gradient of the forest road was below 60%. Afterwards, it checked the route of forest roads from the target attainment point along the contour line, using the Dijkstra method where the gradient of the forest roads was below 35%, to develop the circular network. The program repeated these processes until the density of forest road network reached a predefined value. The road network program was able to plan the forest road network with different numbers of circular networks with the same density of the forest road network by changing the search range of forest roads along the contour line. Then, the development of forest road network and the skidding/yarding efficiency were evaluated. As a result, the average skidding/yarding distance on the forest road network developed by the program was shorter than that of the actual forest road networks constructed by a forest owner; the average distance between attainment points was also shorter than that of the actual forest road networks. Therefore, the program could plan forest road networks on which skidding/yarding efficiency and traffic benefits were improved.

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