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Croatian Journal of Forest Engineering : Journal for Theory and Application of Forestry Engineering, Vol. 42 No. 3, 2021.

Original scientific paper

https://doi.org/10.5552/crojfe.2021.886

The Effect of Yarding Technique on Yarding Productivity and Cost: Conventional Single-Hitch Suspension vs. Horizontal Double-Hitch Suspension

Raffaele Spinelli orcid id orcid.org/0000-0001-9545-1004 ; CNR-IBE Consiglio Nazionale delle Ricerche Istituto per la BioEconomia Via Madonna del Piano 10 50019, Sesto Fiorentino (FI) ITALY
Natascia Magagnotti ; CNR-IBE Consiglio Nazionale delle Ricerche Istituto per la BioEconomia Via Madonna del Piano 10 50019, Sesto Fiorentino (FI) ITALY
Giulio Cosola ; CoNAIBo – Coordinamento Nazionale delle Imprese Boschive Piazzale Merizzi 17 23100 Sondrio (SO) ITALY
Eric R. Labelle ; Université Laval, Department of Wood and Forest Sciences Rue de la Terrasse 1405 G1V 0A6 Québec City CANADA
Rien Visser ; School of Forestry, University of Canterbury Private Bag 4800 8140 Christchurch NEW ZEALAND
Gernot Erber ; University of Natural Resources and Life Sciences, Vienna Department of Forest and Soil Sciences Institute of Forest Engineering Peter Jordan Strasse 82 1190, Vienna AUSTRIA

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Abstract

Cable yarding is a well establish technology for the extraction of timber in steep terrain. However, it is encumbered with relatively low productivity and high costs, and as such this technology needs to adapt and progress to remain viable. The development of biomass as a valuable byproduct, and the availability of processors to support yarder operations, lend themselves to increasing the level of whole-tree extraction. Double-hitch carriages have been developed to allow for full suspension of whole-tree and tree-length material. This study compared a standard single-hitch to a double-hitch carriage under controlled conditions, namely in the same location using the same yarder with downhill extraction. As expected, the double-hitch carriage took longer to load up (+14%), but was able to achieve similar productivity (10–11 m3 per productive machine hour) through increased inhaul speed (+15%). The importance of this study is that it demonstrates both the physical and economic feasibility of moving to whole-tree extraction using the double-hitch type carriage for longer corridors, for settings with limited deflection, or areas with lower tolerance for soil disturbance.

Keywords

cable, skyline, efficiency, logging, harvesting

Hrčak ID:

262224

URI

https://hrcak.srce.hr/262224

Publication date:

1.6.2021.

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