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1.
Time restrictions in forest operations planning
Boštjan Kepic, 2016, master's thesis

Abstract: This master’s thesis deals with annual harvest operations (AHO) planning with consideration of time restrictions. We developed five models of binary integer linear programming (BILP) that schedule working groups to harvest unit areas (HUAs) according to the lowest cost possible. Total AHO costs include felling and skidding costs, transportation costs, and machine relocation costs. The first model is based on the presumption that harvesting can be planned and executed freely throughout the year. In other four, scheduling was subject to time restrictions in HUAs and differed according to the extent of time restrictions. The second model takes into account time restrictions due to unfavourable natural conditions, the third model due to disturbance-free areas of animal species, the fourth and fifth model concurrently include the impact of time restrictions due to natural conditions and disturbance-free areas. The annual workplace time in Model 2 is reduced by 14.2 %, in Model 3 by 16.9 %, in Model 4 by 29.3 % and in Model 5 by 42.3 %. The model tool used to test all the models was designed in Microsoft Excel. All five models were tested with OpenSolver 2.7.1 software. Increasing the extent of time restrictions in forest operations reduces the utilization of the annual workplace time. In testing the second model, we demonstrated that with proper organisation of an AHO plan the planner can influence the working days fallout. In the other three models, we were able to ensure the implementation of AHO plan by introducing extra working groups. Further, we confirmed that time restrictions affect the scheduling of the working groups and the sequencing of tasks. The increases in total AHO costs were explained as an increase in working groups’ costs due to lower utilization rate, an increase in depreciation costs of machines and costs due to unrealized allowable annual cut and timber sales planned for the current year. We tested each model on two examples.
Found in: ključnih besedah
Summary of found: ...time restrictions, binary integer programming, forestry, annual harvest operations planning, harvesting, scheduling working...
Keywords: time restrictions, binary integer programming, forestry, annual harvest operations planning, harvesting, scheduling working teams
Published: 20.09.2016; Views: 2982; Downloads: 161
.pdf Fulltext (4,11 MB)

2.
Managing karst in Coastal British Columbia, Canada
Paul Andre Griffiths, 2020, doctoral dissertation

Abstract: This thesis provides a detailed description and analysis of the system used for managing karst in the forests of coastal British Columbia (BC), where the major land- use activity is industrial forestry. In 2004, BC shifted from a more prescriptive forest management model (the Forest Practices Code) to a less regulated, results-based approach based primarily on the Forest and Range Practices Act (FRPA). The dissertation examines how this results-based management approach for forest resources has worked – or not worked – with respect to karst. The research focused on the five key realms of an environmental management system as defined by the International Standards Organization (ISO 14001 standard): 1) Legislation and Policy, 2) Planning, 3) Implementation, 4) Checking/Corrective Action, and 5) Management Review. The research also examined the roles of professional reliance (another major foundational element of the FRPA model), karst research, and organizational capacity as external factors which influence on the functioning of the karst management system. A combination of interviews, surveys, document reviews and field observations were used to collect qualitative information relevant to all aspects of the karst management system. This research reveals inadequacies in all five realms of BC’s current karst management framework, including gaps in legislation, a lack of implementation of existing standards and guidelines, and non-existent effectiveness and compliance monitoring. The results suggest that BC’s shift to ‘self-regulation’ has yielded unsatisfactory results so far for karst resources and has hindered progress toward implementing a fully integrated science-based ecosystem approach to karst management in the study area. Professional reliance failures are identified as one of the key factors contributing to a breakdown of the management system for karst. This is the first comprehensive study that examines the systems and processes used for managing karst in coastal BC, and consolidates knowledge for government, industry, and others that wish to study or better understand BC’s approach and methods for managing karst. The findings will be useful for private and public forest sector organizations endeavoring to implement fully-functional and effective systems for managing karst in a forestry context. This information may also have more specific applications for managing karst.
Found in: ključnih besedah
Summary of found: ...the major land- use activity is industrial forestry. In 2004, BC shifted from a more...
Keywords: karst ecosystems, protection and management, legislation, policies, standards and guidelines, environmental degradation, forestry impacts, professional reliance, British Columbia, Canada
Published: 02.03.2020; Views: 423; Downloads: 17
.pdf Fulltext (136,27 MB)

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