Author(s):
1. Vladimir Petković, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Dane Marčeta, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Darko Ljubojević, JPŠ Šume Republike Srpske, ŠG Prijedor, Republic of Srpska, Bosnia and Herzegovina
4. Potočnik Igor, Biotechnical Faculty, University of Ljubljana, Slovenia

Abstract:
Transport of timber is one the most expensive part of wood production. It usually consists of three phases: winching, skidding and transport of wood with the trucks. The first and the second phase of transport are the most important from the point of skidding costs. They depend on distance between felling area of trees in the forest and the nearest forest road. That distance is a skidding distance. Determination of skidding distance is very important for operational planning in forestry because it is an indicator of forest accessibility. Value of skidding distance can be obtained in several ways: measurement of distance in the field by skid trails, calculating by using the mathematical models and by using of Geographic Information System (GIS) software. Types of skidding distance can be geometric and real. Geometric skidding distance is obtained by using GIS software, and it is defined as distance between center of gravity of compartment and the nearest point on the forest road. Real skidding distance is calculated on the basis of length of the skid trails. Skidding factor is calculated as ratio of real and geometric skidding distance. It is compared with skidding factors for similar terrain conditions and relief area, because it depends on slope of terrain and presence of obstacles on terrain surface. The skid trails were surveyed by GPS device in the 27 compartments of Forest Management Units (FMU) "Prosara" and "Kozara-Mlječanica" of Forest Management Area (FMA) "Kozaračko", Bosnia and Herzegovina.

Key words:
transport, geometric skidding distance, GPS, GIS, BIH

Thematic field:
Using of Forest Resources and Hunting

Date of abstract submission:
19.09.2017.

Conference:
Šumarska nauka u funkciji održivog razvoja šumarstva
25 godina šumarstva Republike Srpske