Yazar "Erdas, Orhan" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    Investigation of timber harvesting operations using chainsaw considering productivity and residual stand damage: The Case of Bahce Forest Enterprise Chief
    (Istanbul Univ, 2016) Gulci, Nese; Akay, Abdullah Emin; Erdas, Orhan
    Timber harvesting activities are often performed in difficult conditions caused by the mountainous terrain conditions in Turkey. One of the most difficult and dangerous stages of the timber harvesting activities are felling, delimbing, and bucking stages. In some of the European countries with intensive forestry activities, felling, delimbing and bucking stages of timber harvesting are performed with harvesting machines (i.e. harvester, feller-buncher) while these processes are mostly performed with chainsaw in Turkey. The chainsaw operations which are not properly planned and implemented may results in considerable amount of time and productivity losses and environmental damages. At the same time, the risk of work accidents increases during the felling activities. Thus, it is very important to investigate productivity and residual stand damage of chainsaw operations. In this study, harvesting activities using chainsaw were evaluated in terms of productivity and environmental aspects. The field studies were conducted in Brutian Pine stands within Bahce Forest Enterprise Chief of Osmaniye Forest Enterprise Directorate, located in Adana Forest Regional Directorate. Average productivity and timber volume were calculated as 4.06 m(3)/ hr and 0.30 m(3), respectively, and productivity increased as the amount of timber production increased. The results indicated that total number of injured trees as a result of felling operation was 43 in which 13 injuries were on live wood while 30 injuries were on tree barks. It was found that sapwood and bark injuries occurred at the top of the trees during felling activities due to tree hang ups.
  • Küçük Resim Yok
    Öğe
    Optimal planning of timber extraction methods using analytic hierarchy process
    (Springer, 2020) Gulci, Nese; Akay, Abdullah Emin; Erdas, Orhan
    Timber extraction is one of the most difficult work stages of forest operations in Turkey. Inappropriately, planned timber extraction operations can be very time-consuming activities and may also cause serious damage to residual trees, saplings, and forest soil. Thus, an optimal timber extraction method should be determined considering both economic and ecological constraints. In this study, commonly implemented timber extraction methods including chute system, portable winch, and farm tractor were evaluated with respect to their productivity and potential damages on residual trees. In the solution process, one of the well-known multi-criteria decision analysis (MCDA) techniques, the analytic hierarchy process (AHP), was used to determine optimal timber extraction planning of priority scenarios. Specific timber extraction methods were identified and evaluated based on slope, volume, and distance criteria. A total of five priority scenarios were examined: (1) optimal extraction with the highest productivity, (2) optimal extraction with the lowest stand damage, (3) productivity and stand damage receive equal importance, (4) productivity is more important than stand damage, and (5) stand damage is more important than productivity. The AHP results indicated that the optimal timber extraction method was the farm tractor winching with 30 m skidding distance in Scenario I. On the other hand, the portable winch with 20 m skidding distance was found to be the optimal method with the least stand damage. In Scenario III, the portable winch, with an average skidding distance of 40 m, was found to be the most suitable extraction method. The overall results indicated that implementing MCDA techniques for optimal planning of timber extraction will help provide important contributions to conduct economic, environmental, and site-specific operations during logging stages.
  • Küçük Resim
    Öğe
    PRODUCTIVITY ASSESSMENT OF ALTERNATIVE TIMBER DEBARKING METHODS
    (Croatian Forestry Soc, 2017) Gulci, Nese; Akay, Abdullah Emin; Erdas, Orhan
    In Turkey, timber debarking stages are generally carried out by using axes. However, this method takes a lot of time and requires more work forces. In addition, since leaving residual trees with bark in stands increases the risk of insect damages, residual trees require quick barking process. In recent years, chainsaw mounted debarking tools have been widely used in debarking stages due to performing jobs quicker with less labor force. In this study, two different debarking methods including using axes and debarking tool were analyzed by considering operation productivity. The field studies were conducted in Brutian Pine (Pinus brutia Ten.) stand located in Bahce Forest Enterprise Chief of Osmaniye Forest Enterprise Directorate in Adana Regional Forestry Directorate. As a result of study, the productivity of chainsaw mounted debarking tool was found to be five times higher than that of using axes for debarking. Thus, use of chainsaw mounted debarking tool is better alternative than use of axe in debarking activities, as it takes less time and minimize physical work load of the loggers.