Planering av väginvesteringar

Abstract: The problems around and the planning of wood flow is some of the most complex issues in the forest-sector. The experience and overview of the single employees is crucial for the possibility of correct tactical and economical decision-making. The increasing demand of savings and shorter reaction-times with greater flexibility in the wood-supply-chain, makes solutions and aids for improved effectiveness in the work and processes according to wood-flow urgent. Holmen Skog is starting to develop a new forest-road-management-system. The system will facilitate the work according to construction, improvements and updating the standard of roads. The aim of this study was to investigate the tactical and economical functionality of the decision-support tool Vägrust. The goal was to establish a plan for road improvements with 4, 6 and 8 weeks of thaw, running on 10 year at Holmen Skog district Bredbyn. Road-data, stand-data and the coming need of wood at the district founded the base which the optimization was performed. The location of the wood-volumes, conditions of the road-network with respect of accessibility and the yearly procurement-need of the industries was recorded in Vägrust. One optimization was run for each thaw-period of 4, 6 and 8 weeks by Mathias Henningsson at Linköpings universitet. The optimizations shows, in this context, a very low improvement-cost ranging between 5,6-9,7 kr/m³fub for the planning-period depending on the length of the thaw period. Vägrust, that today is a prototype decision-tool, generated useful and reliable plans of road improvements at district Bredbyn. The costs of road management at Holmen Skog AB is supposed to decrease through the use of an optimization-model for road-improvements.