Home About Browse Search
Svenska


Optimisation of forest road investments and the roundwood supply chain

Olsson, Leif (2004). Optimisation of forest road investments and the roundwood supply chain. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 310
ISBN 91-576-6544-3
[Doctoral thesis]

[img]
Preview
PDF
1MB

Abstract

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 mostly occur during spring thaw, but also when rains give muddy gravel roads. The Swedish forest company Holmen Skog decided to support the PhD project presented here with harvest and road data from a forest district, and expert knowledge of road investments. Upgrading of forest roads has been studied in a major part of this thesis, with two case studies at a forest district of average size located around Sveg in Härjedalen. Deterministic scenario analysis has been used and compared to a two-stage stochastic model. Cost functions, assortment mixtures and scenarios have been analysed, and results have been evaluated together with the staff at Holmen Skog. These case studies indicate that the problem can swiftly be solved, at least at average size forest districts. In the last paper a model of the roundwood supply chain is developed and tested via a sample problem. The problem is restricted to the supply chain with fixed harvesting and fixed demand at the mills. The considered uncertainty is load-bearing capacity on the road network, which depends on the water content in the road body and the bearing layer quality. In contrast to the road investment which are long-term decisions, this planning problem is short-term, and in our paper between half a year and one year. One difficult part in this model is the estimation of storage costs. This study, therefore, puts forward the need of measurements of storage costs. Otherwise, it is not possible to optimise the roundwood supply chain in a consistent way. Storage costs should, for that reason, be analysed in the future.

Authors/Creators:Olsson, Leif
Title:Optimisation of forest road investments and the roundwood supply chain
Series/Journal:Acta Universitatis agriculturae Sueciae. Silvestria (1401-6230)
Year of publishing :April 2004
Volume:310
Number of Pages:41
Papers/manuscripts:
NumberReferences
ALLI. Olsson.L., Lohmander.P. 2004. Optimal forest transportation with respect to road investments, In press at Forest Policy and Economics. II. Olsson.L. 2004. Road investment scenarios in Northern Sweden, In press at Forest Policy and Economics. III. Olsson.L. 2004. Optimal road investments - A forest company case study, In press at Systems Analysis- Modelling- Simulation. IV. Olsson.L.2004. Optimal upgrading of forest road networks: Is scenario analysis an appropriate tool? Submitted to Systems Analysis- Modelling- Simulation. V. Lohmander.P., Olsson.L. 2004. Adaptive optimisation in the roundwood supply chain, In press at Systems Analysis- Modelling- Simulation.
Place of Publication:Umeå
Publisher:Department of Forest Economics, Swedish University of Agricultural Sciences
ISBN for printed version:91-576-6544-3
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K11 Forest engineering
U Auxiliary disciplines > U10 Mathematical and statistical methods
Subjects:Not in use, please see Agris categories
Agrovoc terms:roads, roundwood, forests, storage, costs, linear programming, mathematical models, sweden
Keywords:Stochastic Programming, Scenario Analysis, Mixed-Integer Linear Programming, Forest Logistics, Upgrading of gravel roads
URN:NBN:urn:nbn:se:slu:epsilon-209
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-209
ID Code:527
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Economics
Deposited By: Leif Olsson
Deposited On:22 Apr 2004 00:00
Metadata Last Modified:11 Jun 2015 08:40

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits