Optimum road spacing of ground based skidding operations in Nowshahr, Iran

The optimum road spacing has been studied by many researches. It is an important step of forest road network planning. The goals of this study are determining the optimum road spacing in Kheiroudkenar forest of Nowshahr in Northern Iran and study of effect of kind of skidder on skidding cost and road spacing. Continues time study method was used to determine the production rate of TAF and Timberjack ۴۵۰ C skidders in two districts of Kheiroudkenar forest. The production models were developed using stepwise regression method with ۴۶ working cycles for TAF and ۴۴ for Timberjack. The total road construction and skidding cost were calculated for different road spacing for both skidders in one-way and two-way skidding. Based on minimizing the sum of the road and skidding costs, the optimum road spacing was estimated as ۱۷۱۴ m and road density of ۵.۸ m/ha for two-way skidding by Timberjack and estimated optimum road spacing of TAF was ۱۶۰۰ m and road density of ۶.۲۵ m/ha. For one-way skidding, the optimum road spacing of Timberjack was ۱۱۴۳ m and road density of ۸.۸ m/ha, for skidding by TAF, the optimum spacing was estimated as ۱۱۱۴ m and road density of ۸.۹۷ m/ha. The existing road density of Timberjack and TAF skidding sites was ۲۸.۱۶ and ۱۷.۱۱ m/ha respectively which are higher than optimum density. The study of variants method is applied to find the optimal network for existing network in Namkhaneh district.   REFERENCES Abeli, W.S. and Magomu, G.M. (۱۹۹۳) Optimal road spacing for manual skidding sulkies, Journal of Tropical Forest Science, ۶, ۸-۱۵. Akay, A. and Sessions, J. (۲۰۰۱) Minimizing road construction plus forwarding costs under a maximum soil disturbance constraint. The International Mountain Logging and ۱۱th Pacific Northwest Skyline Symposium December ۱۰-۱۲, Seattle, Washington, USA: pp. ۲۶۸-۲۷۹. Bryer, J.B. 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کلیدواژه ها:

skidder ، Production ، Cost ، road density ، road spacing