1. Spatial optimization of ground-based primary extraction routes using the BestWay decision support system
- Author
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Flisberg, Patrik, Ronnqvist, Mikael, Willen, Erik, Frisk, Mikael, and Friberg, Gustav
- Subjects
Logging -- Methods ,Decision support systems -- Methods ,Mathematical optimization -- Usage ,Decision support software ,Earth sciences - Abstract
Improving productivity in forest logging operations while reducing negative impact on soil and streams has gained increasing attention. Positioning primary extraction routes is crucial in these efforts, as it has a huge impact on efficient and sustainable forwarder passages. To minimize the total forwarding distance and avoid steep terrain and impact on soil and water, we developed a decision support system, including a detailed optimization model and solution method. The main source of information consisted of a detailed digital terrain model, depth-to-water maps, and forest volume density. The information was supplemented with the extent of the stand, position of the landing(s), nature and culture conservation sites, and any known unavoidable crossings in the terrain (e.g., streams). Because fast solution time was a critical requirement, we developed a decomposition method based on Lagrangian relaxation. The system was evaluated in two case studies in Sweden. In the first case, the optimization model performance was analyzed at 30 final harvesting sites. In the second case, experienced forest company staff evaluated the primary extraction routes at 19 harvest sites in operational conditions. The results indicated that the model allowed for faster planning, shorter driving distances, and the potential to reduce negative impact on soil and water. Key words: forest operations, decision support system, optimization, routing, network design, forwarding operations. L'amelioration de la productivite de l'exploitation forestiere tout en reduisant l'impact negatif sur le sol et les cours d'eau attire de plus en plus d'attention. L'emplacement des routes primaires d'extraction est crucial dans le cadre de ces efforts etant donne que cela a un impact enorme sur l'efficacite et la durabilite des deplacements des porteurs. Un systeme d'aide a la decision qui inclut un modele detaillee d'optimisation et une methode de solution a ete developpe afin de minimiser la distance totale de debardage et d'eviter les reliefs escarpes ainsi que reduire l'impact negatif sur le sol et l'eau. La principale information comprenait un modele numerique detaille de terrain, des cartes indiquant la profondeur de la nappe phreatique et la densite du volume ligneux. L'information a ete completee avec l'etendue du peuplement, la position des jetees, les sites dedies a la conservation de la nature et presentant un interet culturel ainsi que tout croisement inevitable connu sur le terrain (p. ex. les cours d'eau). Un temps de resolution rapide du modele etait une exigence cruciale, d'ou l'elaboration d'une methode de decomposition fondee sur la relaxation lagrangienne. Le systeme a ete evalue dans deux etudes de cas en Suede. Dans le premier cas, la performance du modele d'optimisation a ete analysee dans 30 sites de coupe finale. Dans le second cas, le personnel experimente de la compagnie forestiere a evalue les routes primaires d'extraction dans 19 sites de coupe dans des conditions operationnelles. Les resultats indiquent que la planification est plus rapide, que les distances de deplacement sont plus courtes et qu'il serait possible de reduire l'impact negatif sur le sol et l'eau. [Traduit par la Redaction] Mots-cles: exploitation forestiere, systeme d'aide a la decision, optimisation, trace, conception de reseaux, operations de debardage., Introduction In recent years, improving productivity in forest logging operations while reducing negative impact on soil and streams has gained increasing attention. In the latter case, ground conditions at regeneration [...]
- Published
- 2021
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