An economic model for integrated roading, yarding, and hauling operations on two alternative harvest unit landings

2014 ◽  
Vol 44 (12) ◽  
pp. 1487-1493
Author(s):  
Francis E. Greulich
Keyword(s):  
Economic Model ◽  
Road Construction ◽  
Bilevel Optimization ◽  
Timber Harvesting ◽  
Numerical Examples

This paper presents an economic model for the optimization of a vertically integrated timber harvesting operation. The operations of road construction, timber yarding, and log truck hauling are collectively optimized. The harvest unit has two centralized landings that are to be accessed by truck road from a single existing road takeoff point. The harvest unit is located on level, unvarying terrain with uniformly distributed log turns. Formulas for the optimal yarding boundary between the landings, areas yarded to each landing, and the average yarding distances are derived. These formulas are then used in the bilevel optimization of a vertically integrated timber harvesting operation. Numerical examples are presented and discussed.

Integrated spatial fire and forest management planning

2010 ◽  
Vol 40 (12) ◽  
pp. 2370-2383 ◽  
Author(s):  
Mauricio A. Acuna ◽  
Cristian D. Palma ◽  
Wenbin Cui ◽  
David L. Martell ◽  
Andres Weintraub
Keyword(s):  
Forest Management ◽  
Net Present Value ◽  
Road Construction ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Harvest Scheduling ◽  
Fire Loss ◽  
Management Planning ◽  
Forest Management Planning ◽  
Access Road

Forest management planners usually treat potential fire loss estimates as exogenous parameters in their timber production planning processes. When they do so, they do not account for the fact that forest access road construction, timber harvesting, and silvicultural activities can alter a landscape’s vegetation or fuel composition, and they ignore the possibility that such activities may influence future fire losses. We develop an integrated fire and forest management planning methodology that accounts for and exploits such interactions. Our methodology is based on fire occurrence, suppression, and spread models, a fire protection value model that identifies crucial stands, the harvesting of which can have a significant influence on the spread of fires across the landscape, and a spatially explicit timber harvest scheduling model. We illustrate its use by applying it to a forest management unit in the boreal forest region of the province of Alberta in western Canada. We found that for our study area, integrated fire – forest management planning based on our methodology could result in an 8.1% increase in net present value when compared with traditional planning in which fire loss is treated as an exogenous factor.

A computer approach to finding an optimal log landing location and analyzing influencing factors for ground-based timber harvesting

2007 ◽  
Vol 37 (2) ◽  
pp. 276-292 ◽  
Author(s):  
Marco Contreras ◽  
Woodam Chung
Keyword(s):  
Influencing Factors ◽  
Road Construction ◽  
Timber Harvesting ◽  
Volume Distribution ◽  
Forest Operations ◽  
Operations Planning ◽  
Factors Influencing ◽  
Gis Data ◽  
Harvest Volume ◽  
Design Factors

Locating a log landing is an important task in forest operations planning. Several methods have been developed to find an optimal landing location and compute a mean skidding distance, but they simplify harvest unit attributes and do not simultaneously consider multiple design factors influencing optimal landing locations. In this study, we introduce a computerized model developed to determine the optimal landing location for ground-based timber harvesting. Using raster-based GIS data, the model finds skid trails from stump to each of candidate landings and selects the best landing location that minimizes total skidding and spur road costs. The model is applied to several hypothetical harvest units with different terrain and harvest volume attributes to analyze the effects of design factors influencing optimal landing locations. Unit boundary shapes, volume distribution, the presence of obstacles, terrain conditions, and spur road construction are considered as influencing design factors.

scholarly journals Assessment of the CLASlite forest monitoring system in detecting disturbance from selective logging in the Selva Maya, Mexico

Silva Fennica ◽  
2019 ◽  
Vol 53 (1) ◽  
Author(s):  
Irving Hernández-Gómez ◽  
Carlos Cerdán ◽  
Angélica Navarro-Martínez ◽  
Dinora Vázquez-Luna ◽  
Samaria Armenta-Montero ◽  
...  
Keyword(s):  
Monitoring System ◽  
Forest Disturbance ◽  
Road Construction ◽  
Timber Harvesting ◽  
Selective Logging ◽  
Reference Points ◽  
Forest Monitoring ◽  
Landsat Images ◽  
Community Forests ◽  
Logging Impacts

Detecting and monitoring forest disturbance from selective logging is necessary to develop effective strategies and polices that conserve tropical forests and mitigate climate change. We assessed the potential of using the remote sensing tool, CLASlite forest monitoring system, to detect disturbance from timber harvesting in four community forests () of the Selva Maya on the Yucatan Peninsula, Mexico. Selective logging impacts (e.g. felling gaps, skid trails, logging roads and log landings) were mapped using GPS in the 2014 annual cutting areas (ACAs) of each ejido. We processed and analyzed two pre-harvest Landsat images (2001 and 2013) and one post-harvest image (November 2014) with the CLASlite system, producing maps of degraded, deforested and unlogged areas in each ACA. Based on reference points of disturbed (felling and skidding), deforested (log landings and roads) and unlogged areas in each ACA, we applied accuracy assessments which showed very low overall accuracies (<19.1%). Selective logging impacts, mainly from log landings and new logging road construction, were detected in only one ejido which had the highest logging intensity (7 m ha).ejidos3–1

Forest road network design using a trade-off analysis between skidding and road construction costs

2008 ◽  
Vol 38 (3) ◽  
pp. 439-448 ◽  
Author(s):  
Woodam Chung ◽  
Jürg Stückelberger ◽  
Kazuhiro Aruga ◽  
Terrance W. Cundy
Keyword(s):  
Road Network ◽  
Road Networks ◽  
Road Construction ◽  
Timber Harvesting ◽  
Sensitivity Analyses ◽  
Large Network ◽  
Road Transportation ◽  
Forest Road ◽  
Network Problem ◽  
Creek Watershed

Designing forest road networks in a large forest land is a challenging task because many feasible alternatives exist and need to be analyzed. To provide field managers with an analytical tool that can create and analyze alternative road networks, we have developed a road network optimization model. The model formulates a large network problem in which links represent two timber transportation options from evenly distributed timber locations: on-road transportation via new roads and off-road transportation using skidders. A heuristic network algorithm is employed to solve the network problem and identify cost-efficient road networks for timber harvesting under given cost parameters. To demonstrate our model, we applied it to a 4760 ha forest in the upper part of the Mica Creek watershed in Idaho owned by Potlatch Forest Holdings, Inc. The sensitivity analyses were conducted to verify the model’s performance under various cost and volume settings. The model-generated road network was compared with a road network proposed by experienced forest engineers in Potlatch. The sensitivity analyses confirm that the model appropriately responds to changes in input parameters. Comparisons between the model output and the manually designed road network indicate that the model tends to develop a tree-shape road network to evenly cover the entire management area.

Multiregional Model with Endogenous Price System for Evaluating Road Construction Projects

1987 ◽  
Vol 19 (8) ◽  
pp. 1093-1114 ◽  
Author(s):  
K Sasaki ◽  
M Shinmei ◽  
S Kunihisa
Keyword(s):  
Economic Model ◽  
Construction Projects ◽  
Road Construction ◽  
Transportation System ◽  
Price System ◽  
Actual Data ◽  
Transport Costs

In this study, the intention is to build a nationwide multiregional economic model for evaluating the impacts of road construction projects, and to test the performance of such a model on the basis of the actual data. Special emphasis is put on capturing the effects of improvement in the transportation system via the decrease in prices owing to a reduction in transport costs. The model in this study, therefore, is equipped with the mechanism for tracing the effects of road construction projects on prices, which is a distinguishing feature compared with models thus far.

scholarly journals Numerical Simulation of Entropy Growth for a Nonlinear Evolutionary Model of Random Markets

2016 ◽  
Vol 2016 ◽  
pp. 1-3
Author(s):  
Mahdi Keshtkar ◽  
Hamidreza Navidi ◽  
Elyas Shivanian
Keyword(s):  
Numerical Simulation ◽  
Economic Model ◽  
Wealth Distribution ◽  
Evolutionary Model ◽  
Current Work ◽  
Numerical Examples ◽  
Evolutionary Problem ◽  
Asymptotic Equilibrium ◽  
Entropy Growth ◽  
Total Wealth

In this communication, the generalized continuous economic model for random markets is revisited. In this model for random markets, agents trade by pairs and exchange their money in a random and conservative way. They display the exponential wealth distribution as asymptotic equilibrium, independently of the effectiveness of the transactions and of the limitation of the total wealth. In the current work, entropy of mentioned model is defined and then some theorems on entropy growth of this evolutionary problem are given. Furthermore, the entropy increasing by simulation on some numerical examples is verified.

scholarly journals Slope instability in relation to timber harvesting in the Chilliwack Provincial Forest

1975 ◽  
Vol 51 (2) ◽  
pp. 59-63 ◽  
Author(s):  
T. M. Ballard ◽  
R. P. Willington
Keyword(s):  
Shear Strength ◽  
Sedimentary Rock ◽  
Road Construction ◽  
Timber Harvesting ◽  
Slope Instability ◽  
Site Conditions ◽  
Slope Failures ◽  
Stability Problems ◽  
Soil Shear Strength ◽  
Specific Factors

Slope instability problems in the Chilliwack Forest are particularly prominent in areas of sedimentary rock and where very steep glaciated slopes persist. Increased frequency of slope failures often appears related to recent logging and road construction. Specific factors contributing to instability can be analyzed by interpreting site conditions in relation to soil shear strength and stress equations. Such analysis can be applied in planning roads and harvesting to minimize stability problems.

A behavioral economic model of addiction

2009 ◽  
Author(s):  
Frederick V. Malmstrom ◽  
David Mullin ◽  
Gary Mears
Keyword(s):  
Economic Model ◽  
Behavioral Economic

Control of Hyperchaos in an OLG Economic Model

2001 ◽  
Author(s):  
Vivaldo Mendes ◽  
Diana A. Mendes
Keyword(s):  
Economic Model
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