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Time consumption and productivity of skidding Silver fir (Abies alba Mill.) round wood in reduced accessibility conditions: a case study in windthrow salvage logging form Romanian Carpathians

Author(s): Stelian Alexandru Borz | Florin Dinulică | Marcian Bîrda | Gheorghe Ignea | Valentina Doina Ciobanu | Bogdan Popa

Journal: Annals of Forest Research
ISSN 1844-8135

Volume: 56;
Issue: 2;
Start page: 363;
Date: 2013;
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Keywords: time consumption | productivity | skidder | reduced accessibility | windthrow salvage cuttings

Natural calamities (especially windthrows) may generate difficultwork conditions in timber harvesting operations. When associated with the reduced accessibility conditions, the work conditions become even harder. This study investigates the time consumptions on specific work elements in timber skidding, develops time prediction models for timber skidding work elements and assesses the production rates for timber skidding in reduced accessibility stands where windthrow salvage cuttings were applied.Following a time study done for two skidders (TAF 690 OP and TAF 657)operating simultaneously in the same felling area, it has been found that, in average, in a delay free skidding cycle time, lateral winching accounted for a share of 26-33%, on-trail skidding accounted for a share of 64-71% and landing operations accounted for a share of 3%. Total delays accounted for 51% and 43% of the total work time in the case of TAF 690 OP skidder and TAF 657 skidder, respectively. Regression models for lateral winching(both skidders) revealed that the winching distance and the number of logs were the relevant predictors for the time consumption estimation (p

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