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Determination of optimum setting dimensions and road standards for uniform terrain

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https://ir.library.oregonstate.edu/concern/graduate_projects/8336h697j

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  • The calculation of optimum setting dimensions and road standards simultaneously on a timber sale is a common problem in uniform terrain. Analysis usually begins by evaluating certain road standards under various road spacings and profile geometries. Linear costs, single period entry and simplified skidding patterns are often assumed to permit simpler calculations and closed form solutions. Various skidding patterns, nonlinear costs, multiple periods, and variable road standards are not considered. In this paper, the simultaneous solution of spur road spacing, collector road spacing, and choice of collector road standards for linear and nonlinear skidding functions are considered. For the linear skidding function, a multiple period formulation is made. The road and landing spacing problem is solved by (1) complete enumeration, (2) a combination of complete enumeration and the Hooke and Jeeves pattern search method, and (3) by the Hooke and Jeeves pattern search method. The Hooke and Jeeves pattern search method provided the fastest solution times with solutions almost as good as the complete enumeration. The improvements in road spacings, and cost evaluation using the more complex assumptions are compared with simpler analyses.
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