Pub Date : 2023-11-09DOI: 10.1080/14942119.2023.2273123
Carley R. D. Knight, M. Chad Bolding, Joseph L. Conrad, Scott M. Barrett
ABSTRACTThe wood supply chain in the United States (U.S.) is experiencing significant challenges related to truck transportation. Obstacles include truck driver recruitment and retention, increases in insurance and fuel costs, insufficient training, and truck or part shortages. This project sought to evaluate transportation inefficiencies in the Georgia, U.S. wood supply chain and to determine obstacles leading to a disconnection between logging business owners, foresters, and truck drivers. The survey targeted two populations: 1) logging business owners/foresters; and 2) log truck drivers. In addition, four case studies were conducted to evaluate innovative strategies that established businesses have enacted. Both groups indicated that a fair annual log truck driver salary should range from $60,000 to $79,000 (USD); however, owners/foresters indicated lower salaries to be more favorable (p = 0.009) and drivers indicated higher salaries to be more favorable (p = 0.029). Half of log truck drivers had been involved in timber transportation for 15 years or more, but 24% of respondents had been involved for less than 5 years, indicating that a new generation of log truck drivers are entering the workforce. Barriers to becoming a log truck driver include limited fringe benefits, lower wages relative to other trucking sectors, and lack of driver experience. Timber transportation capacity is impacted the most by insurance, driver availability, and fuel prices. This study confirmed that there are numerous obstacles facing timber transportation, but also found agreement between drivers and business owners, as well as innovative strategies that are being used throughout the region to improve efficiency.KEYWORDS: Supply chainSoutheastharvestinglogisticsworkforceefficiency Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe work was supported by the Harley Langdale Jr. Center for Forest Business, University of Georgia.
{"title":"Log truck transportation challenges and innovative solutions: evaluating the perspectives of truck drivers, logging business owners, and foresters","authors":"Carley R. D. Knight, M. Chad Bolding, Joseph L. Conrad, Scott M. Barrett","doi":"10.1080/14942119.2023.2273123","DOIUrl":"https://doi.org/10.1080/14942119.2023.2273123","url":null,"abstract":"ABSTRACTThe wood supply chain in the United States (U.S.) is experiencing significant challenges related to truck transportation. Obstacles include truck driver recruitment and retention, increases in insurance and fuel costs, insufficient training, and truck or part shortages. This project sought to evaluate transportation inefficiencies in the Georgia, U.S. wood supply chain and to determine obstacles leading to a disconnection between logging business owners, foresters, and truck drivers. The survey targeted two populations: 1) logging business owners/foresters; and 2) log truck drivers. In addition, four case studies were conducted to evaluate innovative strategies that established businesses have enacted. Both groups indicated that a fair annual log truck driver salary should range from $60,000 to $79,000 (USD); however, owners/foresters indicated lower salaries to be more favorable (p = 0.009) and drivers indicated higher salaries to be more favorable (p = 0.029). Half of log truck drivers had been involved in timber transportation for 15 years or more, but 24% of respondents had been involved for less than 5 years, indicating that a new generation of log truck drivers are entering the workforce. Barriers to becoming a log truck driver include limited fringe benefits, lower wages relative to other trucking sectors, and lack of driver experience. Timber transportation capacity is impacted the most by insurance, driver availability, and fuel prices. This study confirmed that there are numerous obstacles facing timber transportation, but also found agreement between drivers and business owners, as well as innovative strategies that are being used throughout the region to improve efficiency.KEYWORDS: Supply chainSoutheastharvestinglogisticsworkforceefficiency Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe work was supported by the Harley Langdale Jr. Center for Forest Business, University of Georgia.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135241904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-02DOI: 10.1080/14942119.2023.2272093
Charles R. Blinn, Michael T. Carson, Timothy J. O’Hara
ABSTRACTDesign standards for the Federal Interstate Highway System in the US are generally higher than those on other roads within most states, making it the safest road system in the US. Federal law prevents states from enforcing vehicle weight limits on interstate highways that deviate from established Federal weight limits or state-specific grandfathered weight limits or exceptions. As a result, trucks hauling logs at state-legal limits must travel on other roads, passing through towns/cities and school zones where they may encounter on-coming traffic and intersections. All these encounters increase the risk of an accident. This study compared fatality rates of log trucks to other heavy trucks in the lower 48 states, road damage cost estimates for interstate and non-interstate roads and assessed the impact of relaxing interstate weight limits on various factors for hauling logs along three travel corridors in Wisconsin and Minnesota, USA. On a per-load basis, log trucks have a lower fatality rate than other heavy trucks in 83% of the lower 48 states. Due to the higher design standards, pavement damage costs are lowest on interstate highways as compared to other road types. Allowing state-legal, loaded log trucks access to federal interstate highways would improve the overall safety and efficiency of timber transportation and reduce pavement damage costs and CO2 emissions within the study areas. Overall, the study findings suggest that allowing state-legal, loaded log trucks to operate on interstate highways would improve the safety and efficiency of timber transportation in Wisconsin and Minnesota.KEYWORDS: Fatalitiespavement damagetraffic control structuresgross vehicle weight (GVW) AcknowledgementsThe authors wish to thank Henry Schienebeck, Executive Director, Great Lakes Timber Professionals Association for his assistance in securing funding for the project, helping to shape the study focus and recruiting hauler participants; Dr Joseph Conrad, University of Georgia, for sharing information about a comparable study he conducted in the southeastern US; the many trucking business owners and drivers who permitted us to install trackers on their over-the-road log trucks; and the forest products companies that provided data for portions of the analysis.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was supported by the Forest Resources Association; the Timber Harvesting and Transportation Safety Foundation; the Great Lakes Timber Professionals Association; the Department of Forest Resources, University of Minnesota; and the Minnesota Agricultural Experiment Station under projects MN-42-072 and MN-42-117.
{"title":"An assessment of the safety and efficiency of log trucks with increased weight limits on interstate highways in Wisconsin and Minnesota, USA","authors":"Charles R. Blinn, Michael T. Carson, Timothy J. O’Hara","doi":"10.1080/14942119.2023.2272093","DOIUrl":"https://doi.org/10.1080/14942119.2023.2272093","url":null,"abstract":"ABSTRACTDesign standards for the Federal Interstate Highway System in the US are generally higher than those on other roads within most states, making it the safest road system in the US. Federal law prevents states from enforcing vehicle weight limits on interstate highways that deviate from established Federal weight limits or state-specific grandfathered weight limits or exceptions. As a result, trucks hauling logs at state-legal limits must travel on other roads, passing through towns/cities and school zones where they may encounter on-coming traffic and intersections. All these encounters increase the risk of an accident. This study compared fatality rates of log trucks to other heavy trucks in the lower 48 states, road damage cost estimates for interstate and non-interstate roads and assessed the impact of relaxing interstate weight limits on various factors for hauling logs along three travel corridors in Wisconsin and Minnesota, USA. On a per-load basis, log trucks have a lower fatality rate than other heavy trucks in 83% of the lower 48 states. Due to the higher design standards, pavement damage costs are lowest on interstate highways as compared to other road types. Allowing state-legal, loaded log trucks access to federal interstate highways would improve the overall safety and efficiency of timber transportation and reduce pavement damage costs and CO2 emissions within the study areas. Overall, the study findings suggest that allowing state-legal, loaded log trucks to operate on interstate highways would improve the safety and efficiency of timber transportation in Wisconsin and Minnesota.KEYWORDS: Fatalitiespavement damagetraffic control structuresgross vehicle weight (GVW) AcknowledgementsThe authors wish to thank Henry Schienebeck, Executive Director, Great Lakes Timber Professionals Association for his assistance in securing funding for the project, helping to shape the study focus and recruiting hauler participants; Dr Joseph Conrad, University of Georgia, for sharing information about a comparable study he conducted in the southeastern US; the many trucking business owners and drivers who permitted us to install trackers on their over-the-road log trucks; and the forest products companies that provided data for portions of the analysis.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was supported by the Forest Resources Association; the Timber Harvesting and Transportation Safety Foundation; the Great Lakes Timber Professionals Association; the Department of Forest Resources, University of Minnesota; and the Minnesota Agricultural Experiment Station under projects MN-42-072 and MN-42-117.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":"21 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135933832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-09DOI: 10.1080/14942119.2023.2256104
Jeong Ho Kim, Woodam Chung
Exoskeletons have been recognized as an effective ergonomic control to reduce physical risk factors, including forceful exertions and awkward postures that are common in manual timber felling. However, no evidence exists to date that offers industry perspectives, important facilitators, and potential barriers for adopting exoskeletons in the forest industry. Therefore, this study aimed to quantify biomechanical stress of timber fellers and assess forestry professionals’ awareness and acceptance of exoskeletons. We measured working postures using wearable sensors during manual timber felling [N = 10] to suggest appropriate and beneficial exoskeleton types for timber fellers. We examined forestry professionals’ awareness and acceptance of exoskeletons and identified perceived barriers and risks using a questionnaire [N = 22]. This study revealed that the forestry professionals expressed considerable interest and acceptance level in exoskeleton use. The important factors influencing the adoption of exoskeletons identified in this study were weight, comfort, simplicity/portability, practicality (usable and easy to use), and easy maintenance. The results also identified timber felling, cutting/sawing, and mechanic work as potential forestry tasks that may benefit most from the exoskeleton use. The wearable sensor data showed that manual timber felling posed substantial torso bending and upper-arm elevation. Given the awkward posture and high prevalence of musculoskeletal pain in the back and upper-arms, this study suggests that back-support and upper-limb support exoskeletons may be suitable to the forest industry. This study provides important insights for future studies investigating the feasibility, readiness, and effectiveness of exoskeletons to be applied to the forest industry.
{"title":"Forestry professionals’ perspectives on exoskeletons (wearable assistive technology) to improve worker safety and health","authors":"Jeong Ho Kim, Woodam Chung","doi":"10.1080/14942119.2023.2256104","DOIUrl":"https://doi.org/10.1080/14942119.2023.2256104","url":null,"abstract":"Exoskeletons have been recognized as an effective ergonomic control to reduce physical risk factors, including forceful exertions and awkward postures that are common in manual timber felling. However, no evidence exists to date that offers industry perspectives, important facilitators, and potential barriers for adopting exoskeletons in the forest industry. Therefore, this study aimed to quantify biomechanical stress of timber fellers and assess forestry professionals’ awareness and acceptance of exoskeletons. We measured working postures using wearable sensors during manual timber felling [N = 10] to suggest appropriate and beneficial exoskeleton types for timber fellers. We examined forestry professionals’ awareness and acceptance of exoskeletons and identified perceived barriers and risks using a questionnaire [N = 22]. This study revealed that the forestry professionals expressed considerable interest and acceptance level in exoskeleton use. The important factors influencing the adoption of exoskeletons identified in this study were weight, comfort, simplicity/portability, practicality (usable and easy to use), and easy maintenance. The results also identified timber felling, cutting/sawing, and mechanic work as potential forestry tasks that may benefit most from the exoskeleton use. The wearable sensor data showed that manual timber felling posed substantial torso bending and upper-arm elevation. Given the awkward posture and high prevalence of musculoskeletal pain in the back and upper-arms, this study suggests that back-support and upper-limb support exoskeletons may be suitable to the forest industry. This study provides important insights for future studies investigating the feasibility, readiness, and effectiveness of exoskeletons to be applied to the forest industry.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136192836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-06DOI: 10.1080/14942119.2023.2255360
Thainar Rodrigues da Silva, Stanley Schettino, Roldão Carlos Andrade Lima, Rafael dos Santos Figueiredo, Maria Fernanda Lousada Antunes
{"title":"Analysis of variables influencing the cost of wood freight: the case of southeastern Brazil","authors":"Thainar Rodrigues da Silva, Stanley Schettino, Roldão Carlos Andrade Lima, Rafael dos Santos Figueiredo, Maria Fernanda Lousada Antunes","doi":"10.1080/14942119.2023.2255360","DOIUrl":"https://doi.org/10.1080/14942119.2023.2255360","url":null,"abstract":"","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46879309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-31DOI: 10.1080/14942119.2023.2252705
D. Fjeld, Philippe Marier, Björn Edlund, L. Eliasson, Mikael Frisk, M. Rönnqvist
{"title":"Accelerated learning for wood supply managers – the next generation of on-line training tools","authors":"D. Fjeld, Philippe Marier, Björn Edlund, L. Eliasson, Mikael Frisk, M. Rönnqvist","doi":"10.1080/14942119.2023.2252705","DOIUrl":"https://doi.org/10.1080/14942119.2023.2252705","url":null,"abstract":"","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44897000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-23DOI: 10.1080/14942119.2023.2248821
Joseph L. Conrad, IV
{"title":"Post-harvest energy chipping feasibility in mature pine forests in the Coastal Plain of the US South","authors":"Joseph L. Conrad, IV","doi":"10.1080/14942119.2023.2248821","DOIUrl":"https://doi.org/10.1080/14942119.2023.2248821","url":null,"abstract":"","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49615392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-29DOI: 10.1080/14942119.2023.2240607
A. Roos
ABSTRACT Timber supply is affected by natural disruptions such as storms, wildfires, and insect infestations, which modify timber properties and disturb the supply to forest industries. Climate change threatens to increase the prevalence of forest damage and supply chain disturbances. This review analyzed the research between 2000 and 2022 on the effects of forest damage on wood supply chains and management measures to handle such disruptions. The review identified 23 studies from North America, Europe, and Australia and analyzed them regarding damage type and impact, research approach, and key findings. The literature on the topic covers the leading causes of damage: fire, wind damage, and insect infestation. In some cases, climate change was identified as the underlying cause of the supply disruptions. Research approaches involved calculations of consequences, scenario modeling, optimizations, and qualitative studies. This review identifies the essential considerations for successfully handling supply chains after forest damage. Robust supply warrants a range of adaptations, including choices for forest establishment, forest management methods, and collaborative planning. In addition, future research themes based on findings in the retrieved papers are suggested.
{"title":"Forest damage and forest supply chains: a literature review and reflections","authors":"A. Roos","doi":"10.1080/14942119.2023.2240607","DOIUrl":"https://doi.org/10.1080/14942119.2023.2240607","url":null,"abstract":"ABSTRACT Timber supply is affected by natural disruptions such as storms, wildfires, and insect infestations, which modify timber properties and disturb the supply to forest industries. Climate change threatens to increase the prevalence of forest damage and supply chain disturbances. This review analyzed the research between 2000 and 2022 on the effects of forest damage on wood supply chains and management measures to handle such disruptions. The review identified 23 studies from North America, Europe, and Australia and analyzed them regarding damage type and impact, research approach, and key findings. The literature on the topic covers the leading causes of damage: fire, wind damage, and insect infestation. In some cases, climate change was identified as the underlying cause of the supply disruptions. Research approaches involved calculations of consequences, scenario modeling, optimizations, and qualitative studies. This review identifies the essential considerations for successfully handling supply chains after forest damage. Robust supply warrants a range of adaptations, including choices for forest establishment, forest management methods, and collaborative planning. In addition, future research themes based on findings in the retrieved papers are suggested.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45399460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-23DOI: 10.1080/14942119.2023.2238149
Manisha Parajuli, T. Gallagher, Richard Cristan, M. J. Daniel, D. Mitchell, T. McDonald
ABSTRACT The Southern US has the potential to make a significant contribution to the global bioenergy market by producing woody biomass feedstock. Despite extensive research on the technical and economic aspects of biomass production in the Southeastern region, most studies didn’t incorporate the social aspects of forest stakeholders. This study aimed to understand the perceptions of forest stakeholders toward biomass production, consumption, and overall biomass market conditions. We conducted online surveys of biomass producers and consumers using Qualtrics software and found that, on average, 30% of the total harvested volume was made up of small-diameter trees. The main reasons for harvesting biomass were improving the aesthetic value of the site, increasing total revenue, and diversifying the business. Trucking distance with an average haul distance of 84–140 km (one-way), limited local markets, equipment availability, machine and labor costs, and production costs were ranked as biomass producers’ five major challenges. If there were more profitable options with better logistics, shorter transportation distances, and lower production costs, most of the producers (strongly agree = 56%, agree = 34%) would be willing to harvest more biomass. As for consumers, 80% of pellet producers, 33% of heat combustion plants, and only 14% of power combustion plants intend to expand biomass consumption over the next five years. Moreover, stakeholders’ occupation type, tract size, length of ownership, years of consuming biomass, and consumption rate affect biomass production and consumption decisions.
{"title":"Opportunities and challenges of woody biomass harvesting practices in the Southeastern region of the United States","authors":"Manisha Parajuli, T. Gallagher, Richard Cristan, M. J. Daniel, D. Mitchell, T. McDonald","doi":"10.1080/14942119.2023.2238149","DOIUrl":"https://doi.org/10.1080/14942119.2023.2238149","url":null,"abstract":"ABSTRACT The Southern US has the potential to make a significant contribution to the global bioenergy market by producing woody biomass feedstock. Despite extensive research on the technical and economic aspects of biomass production in the Southeastern region, most studies didn’t incorporate the social aspects of forest stakeholders. This study aimed to understand the perceptions of forest stakeholders toward biomass production, consumption, and overall biomass market conditions. We conducted online surveys of biomass producers and consumers using Qualtrics software and found that, on average, 30% of the total harvested volume was made up of small-diameter trees. The main reasons for harvesting biomass were improving the aesthetic value of the site, increasing total revenue, and diversifying the business. Trucking distance with an average haul distance of 84–140 km (one-way), limited local markets, equipment availability, machine and labor costs, and production costs were ranked as biomass producers’ five major challenges. If there were more profitable options with better logistics, shorter transportation distances, and lower production costs, most of the producers (strongly agree = 56%, agree = 34%) would be willing to harvest more biomass. As for consumers, 80% of pellet producers, 33% of heat combustion plants, and only 14% of power combustion plants intend to expand biomass consumption over the next five years. Moreover, stakeholders’ occupation type, tract size, length of ownership, years of consuming biomass, and consumption rate affect biomass production and consumption decisions.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43188237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-21DOI: 10.1080/14942119.2023.2234638
Mikael Lundbäck, C. Häggström, D. Fjeld, T. Nordfjell
ABSTRACT Within cut-to-length forwarding, a theoretical semi-autonomous teleoperation concept called tele-extraction, with automation of crane work and teleoperation of driving, was modeled and simulated. Both configurations modeled had greater potential for cost reduction than a previously studied alternative where the driving was automated, and crane work was teleoperated. Teledrive with teleoperated driving empty, driving loaded, and driving between log piles while loading, showed a reduced cost of 10% for five operators on ten forwarders, whereas teledrive with both loading and driving while loading automated showed a reduced cost of 18% at four operators. In both configurations, the lowest cost was reached at about 10% lower productivity compared to standard forwarding. Increased extraction distance had a negative impact on potential for cost reduction since the driving was teleoperated while terminal activities were autonomous.
{"title":"New configurations of the tele-extraction concept","authors":"Mikael Lundbäck, C. Häggström, D. Fjeld, T. Nordfjell","doi":"10.1080/14942119.2023.2234638","DOIUrl":"https://doi.org/10.1080/14942119.2023.2234638","url":null,"abstract":"ABSTRACT Within cut-to-length forwarding, a theoretical semi-autonomous teleoperation concept called tele-extraction, with automation of crane work and teleoperation of driving, was modeled and simulated. Both configurations modeled had greater potential for cost reduction than a previously studied alternative where the driving was automated, and crane work was teleoperated. Teledrive with teleoperated driving empty, driving loaded, and driving between log piles while loading, showed a reduced cost of 10% for five operators on ten forwarders, whereas teledrive with both loading and driving while loading automated showed a reduced cost of 18% at four operators. In both configurations, the lowest cost was reached at about 10% lower productivity compared to standard forwarding. Increased extraction distance had a negative impact on potential for cost reduction since the driving was teleoperated while terminal activities were autonomous.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43824857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-19DOI: 10.1080/14942119.2023.2229701
A. Solgi, M. Lotfalian, Alireza Rafiei, E. Marchi, U. Ilstedt
ABSTRACT Skidding operations affect soil physical properties, which may impact soil sustainability and forest productivity. While the relationship among harvest machine traffic, slope gradients, and increased soil damage has been well-investigated, it is still unclear how soil damage due to repeated passes of different skidder types is interacting with soil moisture and slope conditions. We examined dry bulk density (BD), total porosity (TP), and rutting depth (RD) of skid trail soil in an Iranian temperate forest. The study took into consideration a combination of five different traffic intensities (TI) (1, 4, 8, 12, and 15 passes), two levels of slope gradients (SGs) (≤20% and > 20%), two rubber-tired skidder types (STs) (Timberjack 450C and TAF E655), and two soil moisture contents (SMC) (18% and 31%). Results showed that changes in BD and TP were mainly related to TI regardless of the ST and the skid trail slope. Regardless of TI, SG, and SMC, the TAF E655 skidder caused a higher dry BD increase and soil porosity reduction than the Timberjack 450C. Furthermore, the higher the SMC, the deeper the ruts at all combinations of TI, SG, and ST. Our findings highlighted that ST, SMC, TI, and SG strongly affect rutting and physical properties of soil.
{"title":"Combined effects of traffic intensity, skid trail slope, skidder type, and soil moisture content on soil degradation in the Hyrcanian forest of Iran","authors":"A. Solgi, M. Lotfalian, Alireza Rafiei, E. Marchi, U. Ilstedt","doi":"10.1080/14942119.2023.2229701","DOIUrl":"https://doi.org/10.1080/14942119.2023.2229701","url":null,"abstract":"ABSTRACT Skidding operations affect soil physical properties, which may impact soil sustainability and forest productivity. While the relationship among harvest machine traffic, slope gradients, and increased soil damage has been well-investigated, it is still unclear how soil damage due to repeated passes of different skidder types is interacting with soil moisture and slope conditions. We examined dry bulk density (BD), total porosity (TP), and rutting depth (RD) of skid trail soil in an Iranian temperate forest. The study took into consideration a combination of five different traffic intensities (TI) (1, 4, 8, 12, and 15 passes), two levels of slope gradients (SGs) (≤20% and > 20%), two rubber-tired skidder types (STs) (Timberjack 450C and TAF E655), and two soil moisture contents (SMC) (18% and 31%). Results showed that changes in BD and TP were mainly related to TI regardless of the ST and the skid trail slope. Regardless of TI, SG, and SMC, the TAF E655 skidder caused a higher dry BD increase and soil porosity reduction than the Timberjack 450C. Furthermore, the higher the SMC, the deeper the ruts at all combinations of TI, SG, and ST. Our findings highlighted that ST, SMC, TI, and SG strongly affect rutting and physical properties of soil.","PeriodicalId":55998,"journal":{"name":"International Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46594562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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