The Scheduling of Forest Harvesting with Adjacency Constraints
نویسنده
چکیده
The forest harvesting problem, FHP, is described. The difference is explained between a strategic model that sets long-term harvesting goals in terms of the total area to be cut each year, and a tactical model that produces a short-term schedule of actual blocks. Reasons are presented for the desirability of an integrated model, embracing both strategic and tactical decisions, which is capable of optimisation. A brief outline of one such model is given. A column generation algorithm is then developed to solve the relaxed linear program formulation. Finally constraint branching techniques are utilised to obtain the desired optimal solution to the integrated model. _____________________________________________________________________
منابع مشابه
Time Efficiency of Selected Types of Adjacency Constraints in Solving Unit Restriction Models
Abstract: Spatial restrictions of harvesting have been extensively studied due to a number of environmental, social and legal regulations. Many spatial restrictions are defined by adjacency constraints, for which a number of algorithms have been developed. Research into the unit restriction model (URM) using a branch and bound algorithm focused on decreasing the number of adjacency constraints ...
متن کاملOptimal Parameter Settings for Solving Harvest Scheduling Models with Adjacency Constraints
Optimal parameter settings to improve the efficiency of solving harvest scheduling models with adjacency constraints were examined using Ilog’s Cplex R © 11.2 optimizer tuning tool. A total of 160 randomly generated hypothetical forests were created with either 50 or 100 stands and four age-class distributions. Mixed integer programming problems were formulated in Model I form with four differe...
متن کاملStrengthening Cover Inequalities for Area-Based Adjacency Formulations of Harvest Scheduling Models
Spatially-explicit harvest scheduling models optimize the spatial and temporal layout of forest management actions in order to best meet management objectives such as profit maximization, even flow of products, or wildlife habitat preservation while satisfying a variety of constraints, including maximum harvest opening size constraints. A procedure is proposed that strengthens these arearestric...
متن کاملScheduling and Stochastic Capacity Estimation of an EV Charging Station with PV Rooftop Using Queuing Theory and Random Forest
Power capacity of EV charging stations could be increased by installing PV arrays on their rooftops. In these charging stations, power transmission can be two-sided when needed. In this paper a new method based on queuing theory and random forest algorithm proposed to calculate net power of charging station considering random SOC of EV’s. Due to estimation time constraints, a queuing model with...
متن کاملIntegrating Spatial Aquatic Habitat Goals Into A Planning Process Considering Harvesting System And Road Management Strategies
ABSTRACT We developed a scheduling model (LMSCHED) that incorporates stream sediment and stream temperature goals into a forest planning process, allowing one to both evaluate the levels of these measures of aquatic habitat, and to set constraints regarding their upper limit. The scheduling model uses tabu search to identify feasible forest plans with respect to goals and constraints that are s...
متن کامل