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Average Yarding Slope and Distance on Settings of Simple Geometric Shape

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Previous studies have found that the slope and distance of a yarding operation can significantly influence harvesting system productivity. Consistently accurate prediction of production levels depends on a good understanding of these two variables and how they are parameterized. On a specific setting, average yarding slope and average yarding distance are two possible production parameters. Different definitions of yarding slope and yarding distance are possible, however. In this study one definition is selected for each of these variables and the average values for a setting with uniform turn distribution are examined. The general equations for average yarding slope and average yarding distance are then applied to four simple geometric shapes. Through relative weighting procedures application is extended to some variation of these four shapes. The results of this study should find use in verification of computer programs, development of theoretical models, and field estimation of operating conditions on particular settings. Forest Sci. 26:195-202.
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Keywords: Timber harvest; forest engineering; production analysis; time studies

Document Type: Journal Article

Affiliations: Assistant Professor of Forest Engineering, College of Forest Resources, University of Washington, Seattle, Washington, 98195

Publication date: 1980-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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