Modelling and comparing timber winching performance in windthrow and uniform selective cuttings for two Romanian skidders

Borz, Stelian Alexandru; Ignea, G.; Popa, Bogdan

doi:10.1007/s10310-014-0439-0

Cited by 18 publications

(15 citation statements)

References 8 publications

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“…The second explanatory variable which was not significant in the survey was the slope inclination. It is likely due to winching direction and slope gradient affect time consumption in the case of manual cable pulling [44]. Nevertheless, the analysis showed significant explanatory variables and interesting findings for optional tasks.…”

Section: Time Consumption and Productivitymentioning

confidence: 84%

Productivity, Costs, and Selected Environmental Impacts of Remote-Controlled Mini Forestry Crawlers

Berendt

Fortin

Suchomel

et al. 2018

Forests

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An effective way to reduce off-road traffic in forests is to implement greater distances between skid trails. However, this implies that trees beyond the boom reach of the harvester need to be felled motor manually before being winched to the skid trail, for example using a remote-controlled mini forestry crawler (MFC). They are only a few local studies which have evaluated the performance of such MFCs. The use of MFCs for wood extraction operations in mixed soft- and hardwood stands is presented in this study conducted in Southwestern Germany. The aim of this study was to analyze the productivity, costs, and selected environmental impacts of mini forestry crawlers during winching operations through a time study. Using statistical regression, time consumption was analyzed in order to determine significant explanatory variables. Environmental impacts were evaluated using the life cycle assessment (LCA) methodology with Umberto software. The mean net cycle time was 4.82 min and the net productivity rate was 7.77 m3 by productive machine hour (PMH0). Explanatory variables which significantly affected the net cycle time were the winched volume, the number of trees per load, and winching distance. Environmental analysis showed that inputs of fossil energy were mostly due to diesel and lubricant consumption. Raw materials for machine manufacture and maintenance showed the highest impact in human toxicity potential category. The MFCs showed good environmental performances, but the harvesting system should become more productive in order to be more cost effective.

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Section: Time Consumption and Productivitymentioning

confidence: 84%

Productivity, Costs, and Selected Environmental Impacts of Remote-Controlled Mini Forestry Crawlers

Berendt

Fortin

Suchomel

et al. 2018

Forests

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“…Compared to common logging, the system productivity is about 6-to 15-fold lower in salvage logging. In relation to the other research on salvage logging [18,28] by ground-based system, mainly by skidder with winch, the gross average productivity was half for the skidder and a quarter for the tractor. The differences increase for the net average productivities; other studies found 6.53 m 3 /h in comparison to 1.58 m 3 /h (skidder used in our research) and 0.84 m 3 /h (tractor used in this research).…”

Section: Discussionmentioning

confidence: 86%

“…For ground-based logging system applied by winching and skidding, there are many studies concerning typical and conventional silvicultural treatments [17][18][19][20][21][22][23][24][25][26][27]; otherwise, regarding salvage logging, few studies have been done [4,18,28,29], and there is a lack of knowledge about close-to-nature situations.…”

Section: Introductionmentioning

confidence: 99%

Ground-Based Extraction on Salvage Logging in Two High Forests: A Productivity and Cost Analysis

Bodaghi

Nikooy

Naghdi

et al. 2018

Forests

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Working time studies, work productivity, and cost assessments of forest logging are of interest to forest managers and planners. These aspects are particularly important in salvage logging, because of difficulties due to irregularly positioned fallen trees in forest areas, and due to particular aspects related to the absence of work planning. In this research, system productivity and the cost of salvage logging are analyzed for two mountain forests managed with close-to nature-silviculture: the Hyrcanian forest, using extraction by a skidder, and the Camaldoli forest, using extraction by tractors. The system productivity of salvage logging by skidders and tractors was calculated as 1.54 and 0.81 m3·h−1, respectively. In contrast to common logging, system productivity was about 6- to 15-fold lower in salvage logging. The effective cost consumptions for the skidder and tractor were calculated as $72.57 and $118.62 USD·m−3, respectively. For both yards, winching time increased due to increasing winching distance and winching load volume. The same result was determined for skidding time in relation to load volume and distance. The possible cost decreases for the skidder and tractor were calculated as 2.6% and 4.3%, respectively. The results revealed that operational costs for extracting wind-fallen trees are higher than for traditional standing-trees extraction for both situations studied. In both cases, the harvesting costs were higher than the timber price by 10% to 30%. Therefore, extraction of wind-fallen trees has no economic justification in these forests.

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“…The prevailing harvesting system combines motor-manual tree felling and processing with extraction done by winch skidders (e.g. Borz et al 2013, Borz et al 2014b, Borz et al 2015, Ignea et al 2017, Moskalik et al 2017. In this operational configuration, final wood assortments are usually bucked at the road side and then transported by trucks to intermediate storage facilities, to forest-based industry plants or to private households.…”

Section: The Romanian Timber Supply Chainmentioning

confidence: 99%

Reengineering the Romanian Timber Supply Chain from a Process Management Perspective

Rauch

Borz

2019

Croat. j. for. eng. (Online)

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Implementation of process management in the forest supply chains has a great potential for organizational and managerial improvement, at least by resource saving. Nevertheless, techniques of process management have been scarcely used to improve the forest supply chains in many parts of the world. In this study, for both Romanian state and private forests, the processes of the timber supply chain – from the harvest site to the forest-based industry plant – are mapped and analyzed. The main objectives of this work were to identify process optimization potentials and to redesign processes in order to improve the performance of the Romanian timber supply chain. Results show that particularly inter-organizational processes offer great saving potentials, mainly due to the existing multi-level hierarchy and multi-level control obligations. Therefore, introducing a web-based platform to enhance a collaborative workflow can considerably decrease the time needed for providing harvest sites or logs to customers via auctions. Further process optimization can be reached by the empowerment of lower level hierarchies facilitating the reduction of hierarchy levels of involved state organizations.

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Modelling and comparing timber winching performance in windthrow and uniform selective cuttings for two Romanian skidders

Cited by 18 publications

References 8 publications

Productivity, Costs, and Selected Environmental Impacts of Remote-Controlled Mini Forestry Crawlers

Productivity, Costs, and Selected Environmental Impacts of Remote-Controlled Mini Forestry Crawlers

Ground-Based Extraction on Salvage Logging in Two High Forests: A Productivity and Cost Analysis

Reengineering the Romanian Timber Supply Chain from a Process Management Perspective

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