Yarding productivity of tree-length harvesting using a small cable-yarder in steep slope, South Korea

Cho, Minjae; Cho, Koohyun; Choi, Bong-Su; Cha, Du-Song

doi:10.1080/21580103.2018.1478887

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…In Korea, no previous study has explicitly compared the HAM300 and K301-4 to highlight their differences and advantages. Many studies have rather focused on the productivity and operation of the HAM300 [12,17] and K301-4 [18]. In addition, the need for cost-effective technologies for steep terrain harvesting is increasing as cable-based extraction methods expand and improve.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison for Two Cable Extraction Machines in a Larix kaempferi (Lamb.) Carr. Plantation

2020

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Forests in Korea are mainly located in steep mountainous areas, where small-shovel-based extraction technology is widely used, with the level of mechanization undoubtedly low due to financial limitations. On this steep terrain, a better approach may be to use cable yarders, which can offer high revenues through cable-based extraction. Therefore, improving the efficiency of cable yarding activities in good-quality timber forests is necessary. The main objectives of this study were to (1) evaluate the productivity and cost of a cable yarder operation for tree-length clearcut treatment of a Larix kaempferi (Lamb.) Carr. stand and (2) compare the productivity efficiency of two yarder (K301-4 and HAM300) types. The productivity rates of the K301-4 ranged from 10.2 to 12.5 m3/productive machine hours, with corresponding costs of US $12.6–15.4 /m3. The productivity of the HAM300 was 26% lower than that of the K301-4 for a 30% lower cycle log volume while yarding and a comparable lateral distance. This study provides insights to support production and management decisions in the forest supply chain associated with planning cable-yarding operations.

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Section: Introductionmentioning

confidence: 99%

Performance Comparison for Two Cable Extraction Machines in a Larix kaempferi (Lamb.) Carr. Plantation

2020

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“…There are a number of past studies that investigate the TL-C method to describe, understand, and improve upon the efficiency of log production and associated operational decisions. Other studies focus on the productivity and operation efficiency of individual machines [21,22], comparing extraction performances among different cable-yarder technologies [23,24], and the effect of yarding direction (uphill vs. downhill) on productivity and cost [10,25] in order to support operational decisions. However, the use of the TL-C method for log hauling activities remains limited since this method requires not only a high skill level, but also an inherently high level of investment [26].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Log Extraction by a Small Shovel Operation in Steep Forests of South Korea

Lee

Han

2019

Forests

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In South Korea, logs for low-value products, such as pulpwood and fuelwood, are primarily extracted from harvest sites and transported to roadside or landing areas using small shovels. Previous studies on log extraction, however, have focused on cable yarding operations with the goal of improving productivity on steep slopes and inaccessible sites, leaving small-shovel operations relatively unexamined. Therefore, the main objectives were to determine small-shovel extraction productivity and costs and to evaluate the impact of related variables on productivity. In addition, we developed a model to estimate productivity under various site conditions. The study took place in 30 case study areas; each area has trees with stems at a diameter at breast height ranging from 18 to 32 cm and a steep slope (greater than 15%). The areas ranged from 241 to 1129 trees per hectare, with conifer, deciduous, and mixed stands. Small-shovel drives ranged from 36 to 72 m per extraction cycle from stump to landing. The results indicated that the mean extraction productivity of small-shovel operations ranged between 2.44 to 9.85 m 3 per scheduled machine hour (including all delays). At the forest level, the estimated average stump-to-forest road log production costs were US $4.37 to 17.66/m 3 . Small-shovel productivity was significantly correlated with stem size (diameter at breast height and tree volume) and total travelled distance (TTD). However, a Pearson's correlation analysis indicated that stand density and slope did not have a significant effect on productivity. Our findings provide insights into how stem size and TTD influence small shovel performance and the predictive ability of productivity. Further, this information may be a valuable asset to forest planners and managers.

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“…This is supported by an earlier study by [19], who noted that for a mini swing yarder, stem size played a more significant role in yarding productivity compared to felling and skidding direction for a thinning operation. Cho et al [20] added that in addition to stem size, other factors that greatly influenced yarding productivity and reduced operational delay included lateral and yarding distance, operational planning, general maintenance of the yarder and technical training of the workforce. The lower cycle time for CS-1 can be explained by a number of factors.…”

Section: Analysis Of the Yarding Cyclementioning

confidence: 99%

Operational Analysis of Grapple Yarding in New Zealand: A Case Study of Three Mechanized Harvesting Operations

Visser

Harrill

Francis

et al. 2023

Forests

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The New Zealand forest industry has increased its use of swing yarders when harvesting on steep slopes. Swing yarders can more readily operate with grapple carriages, both mechanical and motorized, in comparison to tower yarders. Especially when coupled with mechanized felling, grapple yarding has led to improved productivity and safety. The effective use of grapple yarding is dependent on the level of knowledge of the working capability of the machines. This productivity study analyzed the operational capability of grapple yarding at three different harvest sites in North Island, New Zealand. The swing yarders were the T-Mar 650, T-Mar 550, and Madill 124 models. Parameters including average piece size, extraction distance, turn volume and the number of pieces were recorded for each cycle, as well as the level of bunching, with a minimum of 125 cycles, were measured at each site. The average delay-free cycle time for the three sites ranged between 2.8 and 3.7 min, which is very fast compared to yarder operations using chokers. Productivity ranged from 50 to 55 tons per productive machine hour. Extraction distance, piece size and stem presentations significantly influenced productivity. Stem presentation, especially bunching, across the cutover influenced the mean payload per yarding cycle resulting in higher productivity. In addition to providing productivity capability information at three case study sites, the analyses linked stand and terrain parameters such as tree size and extraction distance with production variability. Managing variability is critical to achieving consistently higher rates of production efficiency.

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Yarding productivity of tree-length harvesting using a small cable-yarder in steep slope, South Korea

Cited by 9 publications

References 11 publications

Performance Comparison for Two Cable Extraction Machines in a Larix kaempferi (Lamb.) Carr. Plantation

Performance Comparison for Two Cable Extraction Machines in a Larix kaempferi (Lamb.) Carr. Plantation

Performance Analysis of Log Extraction by a Small Shovel Operation in Steep Forests of South Korea

Operational Analysis of Grapple Yarding in New Zealand: A Case Study of Three Mechanized Harvesting Operations

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