Time consumption and productivity of a forwarder operating on a slope in a cut-to-length harvest system in a Pinus radiata D. Don pine plantation
Time consumption and productivity of a Valmet 890.3 8 wheel forwarder were evaluated on an Australian radiata pine clearfell site with a slope of 21 to 45% (12 to 24°).
Cycle time was significantly related to extraction distance. Productivity was significantly related to extraction distance and load volume. Slope did not have a significant effect on cycle time or productivity. Productivity was considerably greater than that for many published studies, which was likely to have been the result of many factors at the study site affecting load sizes and cycle times, including the large load capacity of the studied forwarder, larger mean log volumes, larger log volumes per loading stop, fewer log assortments, potentially larger forwarder grapple volume capacity, log lengths suited to efficient loading and higher travel speeds.
Acuna M., Skinnell J., Evanson T., Mitchell R. (2011): Bunching with a self-levelling feller-buncher on steep terrain for efficient yarder extraction. Croatian Journal of Forest Engineering, 32: 521–530.
Adebayo A.B., Han H.S., Johnson L. (2007): Productivity and cost of cut-to-length and whole-tree harvesting in a mixed-conifer stand. Forest Products Journal, 57: 59–69.
Bell Jennifer L. (2002): Changes in logging injury rates associated with use of feller-bunchers in West Virginia. Journal of Safety Research, 33, 463-471 https://doi.org/10.1016/S0022-4375(02)00048-8
Brown M., Guimier D., Mercier S., Provencher Y., Turcotte, P. (2002): MultiDAT and Opti-grade: Two knowledge-based electronic solutions for managing forestry operations more efficiently. In: Kellogg L., Spong B., and Licht P. (eds): Pro-ceedings of the Wood for Africa Forest Engineering Conference, Pietermaritzburg, July 2–3, 2002: 45–49.
Danilović M., Stojnić D., Karić S., Sučević M. (2014): Transport of technical roundwood by forwarder and tractor assembly from poplar plantations. Nova mehanizacija šumarstva. Časopis za teoriju i praksu šumarskoga inženjerstva, 35, 11–21
Drews E., Hartsough B., Doyal J., Kellogg L. (2001): Harvester-forwarder and harvester-yarder systems for fuel reduction treatments. Journal of Forest Engineering, 12: 81–87.
Eriksson Mattias, Lindroos Ola (2014): Productivity of harvesters and forwarders in CTL operations in northern Sweden based on large follow-up datasets. International Journal of Forest Engineering, 25, 179-200 https://doi.org/10.1080/14942119.2014.974309
Ghaffariyan MR, Sessions J, Brown M (2012): Machine productivity and residual harvesting residues associated with a cut-to-length harvest system in southern Tasmania. Southern Forests: a Journal of Forest Science, 74, 229-235 https://doi.org/10.2989/20702620.2012.741770
Gingras J.F., Favreau J. (2005): Effect of log length and number of products on the productivity of cut-to-length harvesting in the boreal forest. Advantage, 6: 1–8.
Gullberg T. (1997): A deductive time consumption model for loading shortwood. Journal of Forest Engineering, 8: 35–44.
Hartsough B.R., McNeel J.F., Durston T.A., Stokes B.J. (1994): Comparison of Mechanized Systems for Thinning Ponderosa Pine and Mixed Conifer Stands. Paper No. 94-7513. St. Joseph, ASAE: 20.
Kellogg L.D., Bettinger P. (2013): Thinning Productivity and Cost for a Mechanized Cut-to-Length System in the Northwest Pacific Coast Region of the USA. Journal of Forest Engineering, 5, 43-54 https://doi.org/10.1080/08435243.1994.10702659
Kuitto P.J., Keskinen S., Lindroos J., Oijala T., Rajamäki J., Räsänen T., Terävä J. (1994): Mechanized Cutting and Forest Haulage. Helsinki, Metsäteho: 38. (in Finnish with English summary)
Lileng J. (2007): Harvester and forwarder in steep terrain. In: Gingras J.F. (ed.): Proceedings of the 3rd Forest Engineering Conference: Sustainable Forest Operations: The Future is Now, Mont-Tremblant, Oct 1–4, 2007: 5.
Manner Jussi, Nordfjell Tomas, Lindroos Ola (2013): Effects of the number of assortments and log concentration on time consumption for forwarding. Silva Fennica, 47, - https://doi.org/10.14214/sf.1030
McEwan A., Brink M., van Zyl S. (2013): Guidelines for Difficult Terrain Ground Based Harvesting Operations in South Africa. Scottsville, Institute for Commercial Forestry Research: 149.
Milne B., Chen X.Q., Hann C.E., Parker R. (2013): Robotisation of forestry harvesting in New Zealand – an overview. In: Lin H., Lu J. (eds): Proceedings of the 10th IEEE International Conference on Control and Automation, Hangzhou, June 12–14, 2013: 1609–1614.
Nordfjell T., Athanassiadis D., Talbot B. (2003): Fuel consumption in forwarders. International Journal of Forest Engi-neering, 14: 11–20.
Nurminen Tuomo, Korpunen Heikki, Uusitalo Jori (2006): Time consumption analysis of the mechanized cut-to-length harvesting system. Silva Fennica, 40, - https://doi.org/10.14214/sf.346
Plamondon Jean, Pitt Doug G. (2013): Effects of precommercial thinning on the forest value chain in northwestern New Brunswick: Part 2 – Efficiency gains in cut-to-length harvesting. The Forestry Chronicle, 89, 458-463 https://doi.org/10.5558/tfc2013-087
Spinelli Raffaele, Owende Philip, Ward Shane, Tornero Maximiano (2004): Comparison of short-wood forwarding systems used in Iberia. Silva Fennica, 38, - https://doi.org/10.14214/sf.437
Stampfer K., Steinmüller T. (2001): A new approach to derive a productivity model for the harvester “Valmet 911 Snake”. In: Schiess P., Krogstad F. (eds): Proceedings of the International Mountain Logging and 11th Pacific Northwest Skyline Symposium – A Forest Engineering Odyssey, Seattle, Dec 10–12, 2001: 254–262.
Tervo K., Palmroth L., Koivo H. (2010): Skill Evaluation of Human Operators in Partly Automated Mobile Working Machines. IEEE Transactions on Automation Science and Engineering, 7, 133-142 https://doi.org/10.1109/TASE.2009.2025364
Tiernan D, Zeleke G, Owende P.M.O, Kanali C.L, Lyons J, Ward S.M (2004): Effect of Working Conditions on Forwarder Productivity in Cut-to-length Timber Harvesting on Sensitive Forest Sites in Ireland. Biosystems Engineering, 87, 167-177 https://doi.org/10.1016/j.biosystemseng.2003.11.009
Väätäinen K., Ala-Fossi A., Nuutinen Y., Röser D. (2006): The effect of single grip harvester’s log bunching on forwarder efficiency. Baltic Forestry, 12: 64–69.
Visser R., Stampfer K. (2015): Expanding ground-based harvesting onto steep terrain: A review. Croatian Journal of Forest Engineering, 36: 321–331.
Walsh D., Strandgard M. (2014): Productivity and cost of harvesting a stemwood biomass product from integrated cut-to-length harvest operations in Australian Pinus radiata plantations. Biomass and Bioenergy, 66, 93-102 https://doi.org/10.1016/j.biombioe.2014.01.017