Thinning aged Douglas-fir : an analysis of mobilization costs and a log bucking strategy for revenue improvement Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d791sj716

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  • Contract harvest operations have become the preferred approach to reducing the largest cost component of timber production through free market competition amongst logging contractors bidding or negotiating for work. The goal of this research was to investigate economic components of harvesting operations not previously studied for steep slope thinning harvests in Douglas-fir (Pseudotsuga menziesii) stands. This research explored three important issues affecting Pacific Northwest costs and revenues. On the expense side, mobilization costs associated with wildlife protections restricting harvest operating seasons were modeled for nine Siuslaw National Forest timber sales. Mobilization costs resulting from seasonal restrictions imposed for nesting of northern spotted owl (Strix occidentalis) and marbled murrelet (Brachyramphus marmoratus) were $1.48 to $2.60 per 100 cubic feet (1 Ccf) for an array of sale volumes, cut tree sizes, and one-way mobilization distances. Total sale costs ranged from $7000 to $43000, depending on the number of mobilizations required. With respect to income, two studies were performed to evaluate revenue improvement through bucking-to-value strategies. The first evaluated a reduced set of log lengths that approach computer-generated optimal values and the potential for development of a bucking decision tool. The second sought value optimization with a log allocation constraint through the application of a combinatorial heuristic approach for the reduced set of log lengths to create the bucking pattern cutting card. A reduced set of five log lengths, two mill-length logs and three woods-lengths resulting from combinations of the mill-lengths, was evaluated for value recovery. Resulting values obtained 96 to 98 percent of full set optimal values for 45 and 65 year old stands, respectively. Value recovery exceeded current unaided bucking practices. A modified Simulated Annealing heuristic achieved 99.93 to 100 percent of known maximum for the unconstrained optimization. The SA generated bucking solutions improved value recovery by $2.61 to $2.73 per Ccf while meeting the preferred log allocation. The resulting bucking patterns were easily incorporated into a cutting card based on length to merchantable top. This approach reduced the number of logs handled, increased mill preferred long logs, decreased pattern count, and increased recovered value. Improved revenues exceeded estimated mobilization costs.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-07-28T16:51:09Z (GMT) No. of bitstreams: 1 Pilkerton_Dissertation.pdf: 662218 bytes, checksum: 14fc20da24b750038ff006ac51bd31ce (MD5)
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