A size-structured simulation model for evaluating management strategies in gillnet fisheries exploiting spatially differentiated populations

1996 ◽  
Vol 88 (1-3) ◽  
pp. 195-214 ◽  
Author(s):  
J.S. Pet ◽  
M.A.M. Machiels ◽  
W.L.T. Van Densen
Keyword(s):  
Simulation Model ◽  
Management Strategies ◽  
Spatially Differentiated

Forest management strategies for dealing with fire-related uncertainty when managing two forest seral stages

2011 ◽  
Vol 41 (2) ◽  
pp. 309-320 ◽  
Author(s):  
David W. Savage ◽  
David L. Martell ◽  
B. Mike Wotton
Keyword(s):  
Forest Management ◽  
Simulation Model ◽  
Sustainable Forest Management ◽  
Management Strategies ◽  
Fire Regimes ◽  
Analysis Tool ◽  
Planning Model ◽  
Minimum Area ◽  
Forest Management Planning ◽  
Planning Models

Ecological values are an important aspect of sustainable forest management, but little attention has been paid to maintaining these values when using traditional linear programming (LP) forest management planning models in uncertain planning environments. We embedded an LP planning model that specifies when and how much to harvest in a simulation model of a “managed” flammable forest landscape. The simulation model was used to evaluate two strategies for dealing with fire-related uncertainty when managing mature and old forest areas. The two seral stage areas were constrained in the LP planning model to a minimum of 10% of the total forest area and the strategies were evaluated under four representative fire regimes. We also developed a risk analysis tool that can be used by forest managers that wish to incorporate fire-related uncertainty in their decision-making. We found that use of the LP model would reduce the areas of the mature and old forest to their lower bound and fire would further reduce the seral areas below those levels, particularly when the mean annual burn fraction exceeds 0.45% per annum. Increasing the minimum area required (i.e., the right-hand side of the constraint) would increase the likelihood of satisfying the minimum area requirements.

scholarly journals Simulating the next steps in badger control for bovine tuberculosis in England

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248426
Author(s):  
Graham C. Smith ◽  
Richard Budgey
Keyword(s):  
Simulation Model ◽  
Carrying Capacity ◽  
Bovine Tuberculosis ◽  
Management Strategies ◽  
Fertility Control ◽  
Host Population ◽  
Dramatic Reduction ◽  
Control Option ◽  
Badger Vaccination ◽  
The Uk

Industry-led culling of badgers has occurred in England to reduce the incidence of bovine tuberculosis in cattle for a number of years. Badger vaccination is also possible, and a move away from culling was “highly desirable” in a recent report to the UK government. Here we used an established simulation model to examine badger control option in a post-cull environment in England. These options included no control, various intermittent culling, badger vaccination and use of a vaccine combined with fertility control. The initial simulated cull led to a dramatic reduction in the number of infected badgers present, which increased slowly if there was no further badger management. All three approaches led to a further reduction in the number of infected badgers, with little to choose between the strategies. We do note that of the management strategies only vaccination on its own leads to a recovery of the badger population, but also an increase in the number of badgers that need to be vaccinated. We conclude that vaccination post-cull, appears to be particularly effective, compared to vaccination when the host population is at carrying capacity.

scholarly journals Population Dynamics and Possible Management Options for the Rock Dassie Procavia capensis Population in the Tsitsikamma Coastal National Park

Koedoe ◽  
1987 ◽  
Vol 30 (1) ◽  
Author(s):  
N. Fairall ◽  
N. Hanekom
Keyword(s):  
Population Dynamics ◽  
Simulation Model ◽  
National Park ◽  
Management Strategies ◽  
Management Options ◽  
Simple Simulation ◽  
Demographic Study ◽  
Procavia Capensis

A demographic study of the rock dassie population in the Tsitsikamma Coastal National Park rest camp has provided data that is used to construct a simple simulation model and it is applied to evaluate different management strategies for the rock dassie population.

scholarly journals California’s Food-Energy-Water System: An Open Source Simulation Model of Adaptive Surface and Groundwater Management in the Central Valley

2020 ◽  
Author(s):  
Harrison Zeff ◽  
Andrew L. Hamilton ◽  
Keyvan Malek ◽  
Jonathan Herman ◽  
Jonathan Cohen ◽  
...  
Keyword(s):  
Simulation Model ◽  
Integrated Management ◽  
Management Strategies ◽  
Water System ◽  
Central Valley ◽  
Food Energy ◽  
Production Models ◽  
State Water ◽  
Coordinated Water ◽  
Surface And Groundwater

This study introduces the California Food-Energy-Water System (CALFEWS) simulation model to describe the integrated, multi-sector dynamics that emerge from the coordinated management of surface and groundwater supplies throughout California’s Central Valley. The CALFEWS simulation framework links the operation of state-wide, interbasin transfer projects (i.e., State Water Project, Central Valley Project) with coordinated water management strategies abstracted to the scale of irrigation/water districts. This study contributes a historic baseline (October 1996 – September 2016) evaluation of the model’s performance against observations, including reservoir storage, inter-basin transfers, environmental endpoints, and groundwater banking accounts. State-aware, rules-based representations of critical component systems enable CALFEWS to simulate adaptive management responses to alternative climate, infrastructure, and regulatory scenarios. Moreover, CALFEWS has been designed to maintain interoperability with electric power dispatch and agricultural production models. As such, CALFEWS provides a platform to evaluate internally consistent scenarios for the integrated management of water supply, energy generation, and food production.

Optimal in-season management of pink salmon (Oncorhynchus gorbuscha) given uncertain run sizes and seasonal changes in economic value

2002 ◽  
Vol 59 (10) ◽  
pp. 1648-1659 ◽  
Author(s):  
Zhenming Su ◽  
Milo D Adkison
Keyword(s):  
Simulation Model ◽  
Management Strategies ◽  
Economic Value ◽  
Pink Salmon ◽  
Decision Rules ◽  
Evaluation Criteria ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Flesh Quality ◽  
Fleet Dynamics

In this study, we developed a stochastic simulation model that simulates the in-season abundance dynamics of pink salmon (Oncorhynchus gorbuscha) stocks, the fleet dynamics, and management of purse seine fisheries in the northern Southeast Alaska inside waters. Uncertainties in annual stock size and run timing, fleet dynamics, and both preseason and in-season forecasts were accounted for explicitly in this simulation. The simulation model was applied to evaluating four kinds of management strategies with different fishing opening schedules and decision rules. The ranking of the management strategies is apparently determined by the evaluation criteria applied. When only flesh quality is concerned, both the current and a more aggressive strategy, as long as they adapted themselves to the run strength, were able to provide higher quality fish without compromising the escapement objectives. When the value of the eggs is also a concern, the management strategies that have more intensive late opening schedules might be preferable. When both flesh quality and the value of eggs are considered, the ranking of the management strategies depends on the timing of the stocks.

scholarly journals Processing models for conflicting user requests in ubiquitous corporate smart spaces

2018 ◽  
Vol 161 ◽  
pp. 03006 ◽  
Author(s):  
Dmitriy Levonevskiy ◽  
Irina Vatamaniuk ◽  
Anton Saveliev
Keyword(s):  
Quality Of Service ◽  
Human Computer Interaction ◽  
Simulation Model ◽  
User Experience ◽  
Management Strategies ◽  
Task Management ◽  
Smart Space ◽  
Smart Spaces ◽  
Digital Signage

This paper considers processing of conflicting user requests in ubiquitous corporate smart spaces. The formulated problem consists in the contradiction between the limitation of available smart space resources to perform the conflicting user requests and necessity to provide the proper quality of service in corporate smart spaces. The principles of constructing the simulation model are described. The experiments were carried out basing on a model of the SPIIRAS digital signage service. Several task management strategies are discussed, an assessment of their effectiveness is given. The research is aimed at improving the quality of service and user experience in human-computer interaction within the corporate smart spaces.

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