Determination of Correction Coefficient of Skidding Distance According to Existing Road Network in Lalis Forest of Iran

Abstract

Logging and wood transportation in forest that is the most common and with the most expensive stage of forest harvest is considered as the
most important aim in forest road network planning. Therefore the study that can decrease the expenses is an important step in forest road network
planning. One of the factors that have an important role in logging is the average skidding distance. As a theory, this distance is calculated on map
by considering the forest roads density and areas that is covered by them. This basic digit is used in calculations related to skidding expenses. This
theoretical digit is always less than a real one. Therefore, in planning and study of road variants and calculations related to logging is needed that
average skidding distance be used. In this case it is necessary that in each area must be gotten. In order to reach into this coefficient, measurement
forest roads length and skid trails in a surface of 372 ha in ten parcels in Lalis forest plan was done. The forest roads network density in study area
was calculated and the theoretical distance of skid trails was evaluated (on the map). The ending of calculating average skidding distance in its
transporting and calculating with the theoretical distance of correction coefficient skidding distance in the area of researching is defined equal to
F = 2.3 .