Download or read book Modelling Economic Stand Level Optimization of Forest Harvest Scheduling in Denmark by Application of Decision Tree Optimization and Linear Programming written by Peter Tarp and published by . This book was released on 1994 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Timber Management Scheduling Under Uncertainty written by Howard Michael Hoganson and published by . This book was released on 1981 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Insights from Harvest Scheduling Applications in Minnesota written by Howard M. Hoganson and published by . This book was released on 2014 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extending Harvest scheduling Using Spatial Optimization written by Kai L. Ross and published by . This book was released on 2016 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scheduling of management actions across forest stands is a fundamental task in the world of forestry. However, the spatial and temporal layout of management actions can lead to a combinatorial explosion of potential options to consider. Additionally, these management alternatives must often meet various constraints and limitations. The sheer quantity of options quickly pushes these problems out of the realm of "eyeballing" a good, or even feasible, solution. Because of this, managers have turned to optimization models to help determine the best harvest schedule that meets all requirements. Due to the computational complexity of these models, managers are forced to make simplifying assumptions, and to limit the scope of the models to only the most fundamental aspects. Now, with continued progress in both computational power and solution techniques, it is becoming both practical and feasible to extend these harvest scheduling models to consider broader aspects of the process. In this dissertation I consider two major extensions to harvest scheduling models: road access and edge effects. In chapter 1, I worked with the Washington State Department of Natural Resources to extend their harvest schedule modeling to consider the endogenous cost of rebuilding and maintaining the road network used to access a forest. I propose the Endogenous Fixed Charge Model (EFCM) to incorporate road costs that that vary endogenously with the system's harvest decisions. In a case study in the Pacific Northwest, the EFCM was integrated into DNR's standard workflows through the use of custom software called "Builder" that amended the EFCM constraints and variables to DNR's exiting harvest schedule optimization. Results from the case study show the EFCM was able to increase net present value over a million dollars and to reduce the overall road network by some 14%. In chapter 2, I explore how edge effects between managed forest units can be controlled and mitigated. Newly created edges caused my management actions to alter the landscape and can affect many environmental factors. These altered environmental factors have a variety of impacts on forest growth and structure and can alter harvest yields and habitat for wildlife. After discussing how edge effects can arise from a variety of management actions, I propose a general optimization modeling framework to detect and flag newly created edges while determining an optimal management schedule. I use the real world context of clear-cut harvesting to illustrate multiple possible management objectives tied to the creation and delineation of newly formed edges. In a case study in the Pacific Northwest, I demonstrate how the modeling framework can be used to mitigate damage associated with increased wind exposure caused my neighboring harvests. Results from the case study show the modeling framework functions as intended and that a significant reduction in wind damage can be achieved by considering the spatial and temporal sequencing of harvest actions. In chapter 3, I return to the road access problem to examine how an alternative representation of the road network affects the solution behavior of a joint harvest-scheduling and road-access model using route-finding. Route-finding removes the assumption of predefined routes and allows the optimization model to choose the best hauling route while considering all other harvests that need routing. The number of constraints and variables used for route-finding depend on the size and configuration of the road network. Therefore it is important to consider how alternative representations of the road network effect the solution behavior of these difficult-to-solve models. To test network representations, I propose a Mixed Integer Program (MIP) to include road-access using route-finding within a harvest-scheduling optimization. I apply this model to two different representations of the road network: the Traditional Spatial Representation (TSR) where roads are modeled as arcs connecting nodes, and the Line Graph Representation where roads are modeled as nodes, and arcs represent shared intersections. This transformation retains the same information as the original network, but can alter the number of nodes and arcs in the system. I illustrate the mechanics of the model in a case study in the Pacific Northwest and show that the LGR was able to outperform the TSR in many of the tested scenarios.
Download or read book An Integrated Forest Planning Model written by and published by . This book was released on 1989 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimal Harvest Scheduling at the Forest level in the Presence of Risk of Fire written by William John Reed and published by Forest Economics and Policy Analysis Project, University of B.C.. This book was released on 1985 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MERCHOP a Dynamic Programming Model for Estimating the Harvest Value of Unthinned Loblolly and Slash Pine Plantations written by Rodney L. Busby and published by . This book was released on 1989 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Stochastic Control Approach to Harvest Scheduling in a National Forest written by Bruce Lawrence Dixon and published by . This book was released on 1976 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Mathematical Model for the Integrated Optimization of Harvest and Transport Scheduling of Forest Products written by Paulo Amaro Velloso Henriques dos Santos and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The costs related to forest harvesting and wood transport are key to the economic viability of forest investments. These operations compose a major share of the total cost of wood production and thus need to be conducted in an efficient manner. In this paper, we propose a novel optimization model to tackle this issue and perform the daily and weekly plan of harvesting operations, in order to minimize the costs related to the machinery operation, movement, and wood transportation, subject to demand constraints. Our results show that transportation costs dominate the total cost of these operations. The model proposed is appropriate and can be effectively applied to optimize the operational planning of harvesting activities. Nevertheless, instances with a large number of stands may lead to a substantial increase in the complexity and computational burden. We conclude that operations research techniques can provide a solid basis for decision-making in harvest scheduling problems and increase the efficiency of forest management
Download or read book Proceedings of the Biennial Meeting of the Scandinavian Society of Forest Economics Gilleleje Denmark 22 25 November 1993 written by Scandinavian Society of Forest Economics. Meeting and published by . This book was released on 1994 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic System Modeling in Timber Management written by David C. Cawrse and published by . This book was released on 1979 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trees written by Philip L. Tedder and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume I: TREES (Timber Resource Economic Estimation System), a forest management and harvest scheduling model, is comprehensively described in the first of a four-volume series. Even- or uneven-aged forest inventories form basic resource units (BRUs), entered by age class or size and diameter classes; stocking level; and management intensity. Management assumptions for each grouped resource unit (GRU), a collection of BRUs, specify species type; site class; inventory shifts; changes in management intensity, land base, and utilization standard; and options for thinning, regeneration, cultural treatment, and growth. Harvest assumptions for each allowable cut unit (ACU), a collection of GRUs, comprise information on seven harvest scheduling methods, financial accounting options, and harvest-priority selection. Inventory, harvest, regeneration/cultural treatment, and total harvest/economic reports are available. Computer operating instructions for TREES are included. Volume II: The mathematical relations implicit in TREES (Timber Resource Economic Estimation System), a forest management and harvest scheduling model, are explained in this second of a four-volume series. Algorithm steps for applying fixed harvest scheduling methods (absolute amount, percent of inventory, and area control) are outlined and effects on harvest policy considered. Algorithms for the more complex variable methods (even-flow of volume, even-flow of a function of volume, present net benefit, and present net worth) are detailed; solution feasibility, optimality, and stability evaluated; and effects on harvest policy again considered. Growth options for even-aged stands (standard yield and approach-to-normal growth or volume) and uneven-aged stands (mortality, diameter growth, and ingrowth and upgrowth) are described. Appendices connect algorithms for the variable methods to their computer implementation and present supporting routines for performing quadratic interpolation and setting equation limits. Volume III:Understanding TREES (Timber Resource Economic Estimation System), a forest management and harvest scheduling model, is further aided by detailed examination of eight sample runs in the third of a four-volume series. In the first seven examples, each of seven harvest scheduling methods-three fixed (absolute amount, percent of inventory, and area control) and four variable (even-flow of volume, even-flow of a function of volume, present net benefit, and present net worth)-is applied to an even-aged inventory. The eighth example illustrates switching from a fixed (absolute amount) to a variable (even-flow of volume) harvest scheduling method for an uneven-aged inventory. Complete input specifications for all required files are provided. Portions of requested reports, including the optimization detail and allowable cut and cut-proportion tables, are illustrated via sample output for all eight examples. Inventory, harvest, regeneration/cultural treatment, and total harvest/economic reports are presented for the first and last examples. Volume IV:The FORTRAN code implementing TREES (Timber Resource Economic Estimation System), a forest management and harvest scheduling model, is annotated in this set of organized references, which forms the fourth of a four-volume series, for exploration by computer analysts or experienced users. System organization is depicted in a series of flowcharts, with accompanying discussion. Reference lists provide the location and description for each computer variable in COMMON, the interrelationships of subprograms and their use of COMMON variables and formal parameters, and the input and output operations performed. Special features of the Control Data Corporation CYBER 73 version of FORTRAN IV are briefly noted and miscellaneous features of TREES, including built-in limitations and diagnostic output requests, described.
Download or read book Risk and Uncertainty in the Analysis of Timber Supply written by Peter Lawrence Marshall and published by Forest Economics and Policy Analysis Project, University of B.C.. This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of a Linear Programming geographic Information System Approach to Forest Harvest Scheduling in the Ocala National Forest written by Douglas M. Long and published by . This book was released on 1995 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Decision Support System Approach to Timber Harvest Scheduling written by Dennis Leland Murphy and published by . This book was released on 1981 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forest Systems written by and published by . This book was released on 2013 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Operational Forest Harvest Scheduling Optimisation written by Stuart Anthony Mitchell and published by . This book was released on 2004 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
