Olsson.L. 2004. Optimisation of forest road investments and the roundwood supply chain. Doctor’s disseration. ISSN 1401-6230. ISBN 91-576-6544-3. In a pre-study, concerning roundwood freshness, performed by the Forestry Research Institute of Sweden during the spring of 2000, the quality on the forest road network was identified as a major problem for the Swedish forest sector. These problems mo...

Determining the efficient density for forest roads is essential to decrease the costs of skidding and road constructing in forestry plans. In order to estimate the optimal density for road network in Dalak kheyl forest district (Mazandaran Wood and Paper Industries), we calculated the roading costs and hourly costs of Timber jack 450C and HSM 904 skidders. The length of skid trails was measured...

Nacrtak Forest roads are an essential yet costly part of forest management, and optimization methods are important tools for planning road systems to support harvesting. This paper presents a Mixed Integer Programming (MIP) optimization model to design a forest access system consisting of logging roads for trucking and access spurs for skidding. The network designed is hierarchical in the sense...

*International Tree Conservation and Domestication Program (CAMCORE), Department of Forestry and Environmental Resources, Box 8008, North Carolina State University, Raleigh, North Carolina 27695, U.S.A.; yDepartment of Forestry and Environmental Resources, Forest Science Laboratory, 3401 Cornwallis Road, Research Triangle Park, North Carolina 27709, U.S.A.; and zUSDA Forest Service, National Fo...

In this paper we report on the recent advancements and current status of the XTAG Project, housed at the University of Pennsylvania. We discuss the current coverage of the system, as evaluated on the TSNLP English sentences, hierarchical organization of the grammar, and the new and more portable implementation of the X-interface to the grammar and all of the supporting tools in CLISP, which is ...

Nacrtak Sound development of forest infrastructure represents the backbone for sustainable forest management. However, planning forest roads, which nowadays must fulfill multiple conflicting objectives, is not an easy task. A GIS based model was developed for supporting decision making in forest road engineering. The tool allowed assessment of forest infrastructure scenarios based on multiple c...

This study measured runoff and sediment concentration from the tire track and from the non-tire track to determine infiltration, interrill erodibility, and vegetative cover impacts of reopening an abandoned forest road. Runoff was lowest on the non-track portion of the abandoned road and highest on the reopened road. Sediment concentrations were significantly higher on the reopened road. Increa...

Jason D.Thompson R eduction of nonpoint source pollution of forest streams is a major issue in the forest products industry. Consequently, extensive research has been focused on documenting impacts of forest harvesting, road construction, and site preparation on water quality in forest streams. Researchers have found that roads create more pollution, in the form of sediment, than harvesting act...

The effectiveness of four road turn–out ditch treatments (vegetation, rip–rap, sediment fences, and settling basins) in reducing sediment export to the forest floor was evaluated. These four runoff control methods are commonly prescribed to control forest road runoff and sediments. The study utilized runoff samplers, runoff diversion walls, sediment filter bags, and erosion stakes to evaluate r...