Investigation methods evaluation of forest road network according to graph theory

This research has been done in order to review and introduce the technical, economic and services criteria in regional and watershed level. First, the road network components in form of graph theory (node, link, sub-graph, and buckle), road network (planar and non-planar graphs), link structural characteristics (connectivity, chain, length of link, cycle, circuit, clique and cluster), network structural characteristics (connectivity, complementarity, tree networks, root and articulation node) were investigated. Then economic criteria (Turker cost-benefit , value cost), services criteria of importance (replacement, security-defensive, social, rescue, welfare and recreational-pilgrimage) and technical (α, β,ɣ indices, detour Index, network density, π, η, diameter and number of cycles) were identified. Result showed that regarding the common characteristics between forest road networks and public roads all of the economic and services criteria and some of the technical criteria such as α and β indices, diameter and network density are suitable criteria for comprehensive evaluation of forest road networks.