Browsing by Author "Gumus S."

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A cost effectiveness approach for configuration of feasible skyline yarder for specific forest regions
(2017-07-01) Gumus S.; Hatay T.
The skyline yarder usage is the main extraction system in developed countries especially on steep terrains depending on cost effectiveness. Despite the availability of skyline yarder in many different types and characteristics it is extremely important choosing the feasible skyline yarder that will best meet the wood extraction requirements of any particular forest area, whether it is purchased or manufactured. It was aimed to configure the feasible forest skyline yarder by determining the technical and economic characteristics, which will be needed according to the qualifications of wood extraction operations of the Eastern Black Sea region of Turkey. The configuration is based on determining the technical specifications (skyline cable length, max. cycle load capacity and daily productivity) of the skyline yarder according to the extraction distance and the carrying capacity to be determined depending on the load to be carried at carriage cycle time. Technical specifications were evaluated by the cost of skyline yarder operation and the cost of the alternative extracting system by cost-effectiveness analysis method. The study showed that a feasible skyline yarder's technical specification must have at least 700 m yarding distances, ten cycles per a working day and 2.2 t carriage load capacity per cycle. This skyline yarders can be operated at the cost of 16.70 €m3 if the daily productivity amount 30 m3 is. The work machine companies produce in a wide range of technical specifications, for this reason, the feasibility analysis should be made for selection of a logging machine, especially for local usage. Also, if domestic machinery production is considered, this scientific data will be the starting point.
Analysis of tree damage caused by rockfall at forest road construction works
(2009-12-01) Gumus S.; Aricak B.; Enez K.; Hulusi Acar H.
Forest roads provide access for people to study, enjoy or contemplate natural ecosystems. Therefore, roads are one of the most important tools needed in forestry. Forest roads are built by excavation of soil and rock. Rockfall occurs during construction works, caused by excavated rock pieces on embankment slopes and by blasting of block rock masses. This study analyzes rockfall damage to trees during forest road construction. Injuries, branches brokenness, trunk wounds and collapse were defined as tree damages because of rockfall during road construction. These damages have been analyzed by site measurements and statistical analysis. In the study area it has been determined that 90.48% of damaged trees are in the first 10 m after the beginning of the embankment slope, and the rest of the trees are positioned between 11 m and 23 m away from the beginning of the embankment slope. The average injury area of the damaged trees was calculated as 1,081 cm2 for the first 10 mfrom the embankment slope, and an injury area of 1,463 cm2 was calculated for between 11 m and 23 m on the embankment slope. This is a very important result in terms of forest protection. Wooden obstruction or synthetic holders should be used as preventative measures in the first 10 m of the embankment slope of the road to block rockfall or slow it down.