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European Journal of Forest Engineering
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  This is an Open Access Journal Open Access journal
ISSN (Online) 2149-5637
Published by DergiPark Homepage  [148 journals]
  • Potential Contribution of Optimum Bucking Method to Forest Products
           Industry

    • Authors: Abdullah E. Akay
      Abstract: In production of forest products, it is important to produce high quality timber with maximum economic value while considering current market demands. After felling, trees are limbed, barked, and bucked.  Bucking stage is critical to increase economic gain in timber production. The process of dividing a tree into sections with respect to required quality classes is called bucking. Optimum bucking is cross-cutting of a tree into the sections that maximize the total economic value. Previous studies indicated that optimum method potentially increases economic value of the forest product up to 10% or more. On the other hand, optimum bucking requires large number of bucking combinations that can be quickly generated by computer-assisted methods. Some of these methods may include network analysis, dynamic programming, and heuristic techniques. In Turkey, bucking is generally performed based on loggers’ experiences without using any scientific approach. In this study, dynamic programming based optimum bucking method was implemented to maximize economic value in tree bucking. The bucking application was evaluated in a selective cutting of Yellow Pine (Pinus sylvestris) trees in the city of Bolu. The optimum bucking approach was compared with traditional bucking method, and the approximate contribution of using optimum bucking approach was computed. The results indicated that using optimum bucking method increased the total value of harvested trees by 8.7%. It was also revealed that performance of optimum bucking method is mainly influenced by log lengths and diameters.
      PubDate: Sun, 24 Dec 2017 00:00:00 +030
       
  • Analyzing Compatibility of Geometrical Parameters of Logging Vehicles and
           Forest Roads

    • Authors: Murat Demir; Mustafa Akgül, Tolga Öztürk
      Abstract: Forestroad is a complex and cost stage of the transportation. Forest roads enables totransportation of forest products. Well planned forest road networks improveeffectiveness of transport. In order to provide safe and continuous transportlong timber, long vehicles such as long truck, 18 wheels needed and appropriatecurve widening. In the study, CAD based horizontal driving analysis wereperformed on existing forest road to determine curve widening requirements fortruck and semitrailer. According to results, in case of using semitrailer with4-meter platform width curve widening area will be needed 6 times more thanusing truck while, platform with 5-meter curve widening area will be needed 16times more than truck usage. Consequently, driving analysis results is a beneficialapproach for decision makers to achieve optimal solution and to minimizingtransport operation costs in forestry.
      PubDate: Wed, 20 Dec 2017 00:00:00 +030
       
  • Effect of Subsurface Materials on Earthwork Operation Costs of Forest Road

    • Authors: Iman Pazhouhan; Akbar Najafi, Abolghasem Kamkar Rouhani, Javad Vahidi
      Abstract: Major cost of forest constructionoperation is spent to earthwork operations. Therefore, time studies, estimationmachine productivity and earthwork operation cost would be necessary to betterutilization of current resources. In this research, impact of subsurfacematerials as key factor in forest road construction operation was investigatedin a one kilometer forest road as study area. Subsurface material of the road,constructed by a Hydraulic excavator and a bulldozer, was contained threelayers in term of digging: soft (soil), medium and hard (rocky). For thispurpose, time of machines work cycle elements included warm up, movement fromcamp to study area, extracting remained trunk if any, earthwork activity,mealtimes and regular delays were accurately recorded during 15 working days.Furthermore, relevant cut and fill subsurface material was measured precisely.The results of continues time studies showed that mean production rates varyfrom 34.98 m3/hr in hard layer to 331.63 m3/hr in soft layer. Theresults indicated that there was a direct relationship between rock sharevolume and delay times, therefore technical and personal delays in rocky layerswere considerably more than other layers. Proportions of delays were 9% and 16%in soil and rocky layers, respectively. Also, production cost was 0.12 $/m3,0.27 $/m3 and 1.13 $/m3 in soil, medium, and rockylayers, respectively.
      PubDate: Tue, 05 Dec 2017 00:00:00 +030
       
 
 
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