Productivity of a Portable Winch System Used in Salvage Logging of Storm-Damaged Timber

Bilici, Ebru; Andiç, Güryay Volkan; Akay, Abdullah E.; Sessions, John

doi:10.5552/crojfe.2019.590

Cited by 5 publications

(4 citation statements)

References 3 publications

(3 reference statements)

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“…Especially in the last ten years, there have been some studies carried out in order to better assess the efficiency and costs and support the planning of timber harvesting operations after windthrows [2,[11][12][13][14][15][16][17][18][19][20][21][22]. In this section, already developed productivity models are presented.…”

Section: Predicting the Efficiency Of Timber Harvesting Operations Af...mentioning

confidence: 99%

Capacity Planning of Timber Harvesting in Windthrow Areas

Kühmaier

Gollob

Nothdurft

et al. 2022

Forests

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Digitization can help the forest industry to improve cost efficiency and to reduce possible environmental impacts. In the context of this study, models were implemented using the example of windthrow processing, which enables a capacity planning for carrying out timber harvesting. For capacity planning, it is necessary to estimate the time required by the harvesting systems. For this purpose, existing productivity models were analyzed, the models were validated and adjusted, and the time required for each harvesting system and calamity area was calculated using stand and terrain parameters. Depending on the scenario and the preferred harvesting system, the time for harvesting the timber in an almost 200-hectare windthrow area in a case study region in Carinthia (Austria) varied. The harvesting with cable yarder and tractor takes about 26,000 machine hours and 86,000 man-hours. Harvesting operations with cable yarder and harvester-forwarder has proven to be the most productive with a duration of around 20,000 machine hours and 70,000 man-hours. Depending on the scenario, in windthrow areas, forest workers are needed for 28 to 42 min to fell, delimb, buck and extract 1 m3 of timber to the forest landing.

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Section: Predicting the Efficiency Of Timber Harvesting Operations Af...mentioning

confidence: 99%

Capacity Planning of Timber Harvesting in Windthrow Areas

Kühmaier

Gollob

Nothdurft

et al. 2022

Forests

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“…For example, Hlásný et al (2017) evaluated the climate effects on the productivity of three temperate tree spe-cies in the Czech Republic and Slovak Republic. Routa et al (2020) focused on the productivity of mechanized tending when compared to manual tending and Bilici et al (2019) focused on the productivity of logging damaged by a storm. The impact of bark beetles on tree mortality and the impact of the changing climate is also a current topic; see, for example, Matthews et al (2018), Kolář et al (2017) and Mezei et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Micro-Data Efficiency Evaluation of Forest Companies

Staňková

Hampel

Janová

2022

Croat. j. for. eng. (Online)

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The forestry sector is facing critical challenges due to climate change. Decision-making support based on efficiency evaluation using non-parametric methods could provide important information for both forest managers and policymakers. However, such advanced technical analysis is scarce in forestry science. When applied, its application has been primarily based on aggregated, macro-level data, and efficiency was analysed for the forestry sector as a whole. There is a lack of studies from the company-level perspective, which are needed to provide sound decision support.In this paper, we focus on the micro-data level and offer the data envelopment analysis model settings and interpretations for an efficiency evaluation based on the financial data of individual forestry companies. The aim is to provide an original analysis of the company-level driving forces of forestry sector efficiency. The results for central European countries show that efficiency is driven by company size and country of operation. The study also confirms that, generally, German companies are the »efficiency leaders« in the region, while Czech companies may serve as an efficiency reference for east-central European forestry companies.

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“…This task is extremely challenging when it comes to work safety and productivity. High accident risk derives from the production of timber with characteristics that are nonstandard and difficult to evaluate [13]. Furthermore, timber harvesting in windthrown stands offers particularly difficult conditions when it comes to moving, setting a safe work sequence and minimizing additional value losses.…”

Section: Introductionmentioning

confidence: 99%

Perception of the Harvester Operator’s Working Environment in Windthrow Stands

Szewczyk

Spinelli²,

Magagnotti³

et al. 2021

Forests

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The aim of the study was to determine the mental workload of a harvester operator when working in late thinning and in windthrown stands of the same type and age, using eye movement patterns as an indicator. Eyeball movement variability was analysed using the eye tracking method. The mean duration of eyesight fixations in windthrown stands was shorter than in the control undamaged stands by about 20% (444 ms and 534 ms, respectively). The mean time of eyesight movements (saccades) in the windthrown stands was shorter than in the control undamaged stands by approx. 15%. The largest differences between the duration of saccades in the windthrown and control stands were observed between the cutting of trees and cutting logs off their root plates: the saccades were longer by about 20% when working in the control stands (49 ms) as compared to the windthrown stands (43 ms). Large differences in the duration of saccades between the windthrown area (42 ms) and the control area (47 ms) were also found when travelling between successive operation sites. In both types of stands, the shortest saccades were observed during processing: 39 ms. Summary durations of saccades observed during the processing of successive trees occurred in sequences showing repeated periods of variable eyeball activity, where longer saccades were followed by shorter ones. Documented more variability of eyesight activities of the harvester operator performing the operations of processing and moving is new standard of eye balls activities for the more taxing work conditions presented by windthrown stands.

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Productivity of a Portable Winch System Used in Salvage Logging of Storm-Damaged Timber

Cited by 5 publications

References 3 publications

Capacity Planning of Timber Harvesting in Windthrow Areas

Capacity Planning of Timber Harvesting in Windthrow Areas

Micro-Data Efficiency Evaluation of Forest Companies

Perception of the Harvester Operator’s Working Environment in Windthrow Stands

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