Articles by Author: Pierre A Ackerman

Search results for Pierre A Ackerman

We found 88 results for you
  1. “Shorthaul” pulpwood transport in South Africa. A network analysis case study

    “Shorthaul” pulpwood transport in South Africa. A network analysis case study

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Shorthaul transport, also known as secondary intermediate transport (SIT), is a feature of pulpwood transport in South Africa. SIT is an additional transport phase within traditional secondary transport. It originates at roadside landing or depot and terminates at another depot,...
  2. On-board computing in forest machinery as a tool to improve skidding operations in South African softwood sawtimber operations

    On-board computing in forest machinery as a tool to improve skidding operations in South African softwood sawtimber operations

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    On-board computing (OBC) systems in South African timber-harvesting operations are currently limited because of the lack of local expertise and experience. In this study three trials were conducted, monitoring three skidder extraction operations at three sites in South African softwood...
  3. Effects of irregular stand structure on tree growth, crown extension and branchiness of plantation-grown <em>Pinus patula</em>

    Effects of irregular stand structure on tree growth, crown extension and branchiness of plantation-grown <em>Pinus patula</em>

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The practice of combining row and selective thinning in commercial pine plantation silviculture carries the risk of unwanted irregularities in tree distribution, a situation that is aggravated when tree selection during marking is poor. The potential consequences of poor tree...
  4. Modelling of wander ratios, travel speeds and productivity of cable and grapple skidders in softwood sawtimber operations in South Africa

    Modelling of wander ratios, travel speeds and productivity of cable and grapple skidders in softwood sawtimber operations in South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The objective of this study was to develop predictive models for cable and grapple skidder wander ratios, travel speeds (loaded and unloaded), and productivity in softwood roundwood sawtimber harvesting operations. For field data collection, the study utilised on-board computing systems...
  5. Softwood sawlog secondary transport travel speed prediction for the South African forestry industry

    Softwood sawlog secondary transport travel speed prediction for the South African forestry industry

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The objective of this study was to develop a predictive model for travel speed of softwood sawlog timber transport (STT) vehicles over a range of forest and provincial roads of varying condition for the South African forestry industry. Data was...
  6. Biomass equations for selected drought-tolerant eucalypts in South Africa

    Biomass equations for selected drought-tolerant eucalypts in South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    In the water-scarce environment of South Africa, drought-tolerant eucalypt species have the potential to contribute to the timber and biomass resource. Biomass functions are a necessary prerequisite to predict yield and carbon sequestration. In this study preliminary biomass models for...
  7. Fibre losses during debranching and debarking of <em>Eucalyptus</em> pulp logs using a single-grip harvester

    Fibre losses during debranching and debarking of <em>Eucalyptus</em> pulp logs using a single-grip harvester

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Mechanised harvesting operations are becoming more prevalent in South Africa, with the realisation that motor- manual and manual harvesting operations pose significant health and safety risks to workers. However, the potential damage caused by single-grip harvester feed rollers and delimbing...
  8. The impact of mechanical log surface damage on chip size uniformity during debranching and debarking <em>Eucalyptus</em> pulpwood logs using a single-grip harvester

    The impact of mechanical log surface damage on chip size uniformity during debranching and debarking <em>Eucalyptus</em> pulpwood logs using a single-grip harvester

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Mechanised harvesting operations are becoming more prevalent in South Africa with the realisation that motormanual and manual harvesting operations pose significant health and safety risks to workers. The damage inflicted by single-grip harvester feed rollers and delimbing knives on log...
  9. Cost-productivity analysis of South African pine sawtimber mechanised cut-to-length harvesting

    Cost-productivity analysis of South African pine sawtimber mechanised cut-to-length harvesting

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The South African forestry industry is experiencing an increase in the number of fully mechanised timber-harvesting systems. Understanding the productivity of these systems, for which data is currently limited for South Africa, is an important step to maximise the utilisation...
  10. A South African softwood sawtimber supply chain case study

    A South African softwood sawtimber supply chain case study

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Supply chain management principles were analysed by investigating the effects of smaller-scale and incremental interventions in a forest-to-mill value chain on financial returns and forest resource use in an Eastern Cape case study area. Three previous studies provided input by...