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ŠUMARSKI LIST 7-8/2017 str. 53     <-- 53 -->        PDF

strategy to implement (Naesset et al., 1997; Nielsen et al., 2007; Moseley et al., 2011). For instance, a cable crane or sledge yarder could work only 2000 hours in a year considering climate conditions, holidays, maintenance or installation and dismantling periods. This information was collected from forest enterprise and timber extraction contractors. Moreover, it is quite difficult to use two machines which have the same features at the same time, due to the high demand from other forest enterprises. This is more problematic for sledge yarders considering the potential numbers and high demand due to the extreme topographic conditions and low road density in Black sea region. Among the three strategies, the second strategy (STR2) with the maximal total profit from timber production including time constraints less than 2,000 hours for cable cranes and sledge yarders can be selected for the above reasons. These constraints allow the working of one machine for each type. When this strategy is implemented, earned revenue of 6,365,205 €, 19,055 hours spent, and 1,697.8 m3 timber will be lost, while 91.77 damage will occur. The representation of the optimal solution with the help of GIS was given in Figure 4.
When looked at conducted similar studies investigating appropriate timber extraction systems, Acar et al., (2000) suggested, combination of 4% human power, 36% skidder and 60% small size cable crane model, minimizing the cost