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Registros recuperados: 7
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Economics of controlling a spreading environmental weed AgEcon
Chalak, Morteza; Pannell, David J..
Weeds can cause significant problems to natural ecosystems. Although there have been numerous studies on the economics of weed control, relatively few of these studies have focused on natural ecosystems. This paper addresses this gap in the literature by assessing the cost-effectiveness of a comprehensive range of control strategies for blackberry (Rubus anglocandicans) in natural environments in Australia. We developed a stochastic dynamic simulation model and a deterministic dynamic optimisation model. The stochastic model calculates the expected net present value (NPV) of a range of control strategies, including any combination of treatment options. The optimisation model identifies the treatment combination that maximises NPV. Both models represent the...
Tipo: Working or Discussion Paper Palavras-chave: Environment; Economics; Weed; Stochastic; Optimisation; Management; Environmental Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/108416
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Economics of Controlling Invasive Species: A Stochastic Optimisation Model for a Spatial-Dynamic Process AgEcon
Chalak, Morteza; Pannell, David J.; Polyakov, Maksym.
Invasive species are significant threats to biodiversity, natural ecosystems and agriculture leading to large worldwide economic and environmental damage. Spread and control of invasive species are stochastic processes with important spatial dimensions. Most economic studies of invasive species control ignore spatial and stochastic aspects. This paper covers this gap in the previous studies by analysing a spatially explicit dynamic process of controlling invasive species in a stochastic setting. We show how stochasticity, spatial location of infestation and control can influence the spread, control efficiency and optimal control strategies. The main aim of this paper is to analyse the relationship between economic parameters and stochastic spatial...
Tipo: Conference Paper or Presentation Palavras-chave: Environmental Economics and Policy; Land Economics/Use.
Ano: 2011 URL: http://purl.umn.edu/115513
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Economics of controlling invasive species: a stochastic optimisation model for a spatial-dynamic process AgEcon
Chalak, Morteza; Pannell, David J.; Polyakov, Maksym.
Invasive species are significant threats to biodiversity, natural ecosystems and agriculture leading to large worldwide economic and environmental damage. Spread and control of invasive species are stochastic processes with important spatial dimensions. Most economic studies of invasive species control ignore spatial and stochastic aspects. This paper covers this gap in the previous studies by analysing a spatially explicit dynamic process of controlling invasive species in a stochastic setting. We show how stochasticity, spatial location of infestation and control can influence the spread, control efficiency and optimal control strategies. The main aim of this paper is to analyse the relationship between economic parameters and stochastic spatial...
Tipo: Conference Paper or Presentation Palavras-chave: Spatial; Dynamics; Invasive; Economics; Stochastic; Optimisation; Environmental Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/103325
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Economics of controlling invasive species: optimal control and stability of ecological-economic system AgEcon
Chalak, Morteza; Ruijs, Arjan; Hemerik, Lia; van der Werf, Wopke; van Ierland, Ekko C..
Natural enemies such as herbivores that are introduced to reduce invasive plants can spill over into nature, threaten indigenous species and impose significant costs. We develop a bioeconomic model to analyse the optimal control management strategy of an introduced herbivore that has spilled over from a managed system to a natural area. Cost-effective control strategies are analysed that reduce the spillover effects of herbivores on endangered plants species to reduce the risk of extinction and increase benefits obtained from the ecosystem. We consider two competing indigenous plant species as the representatives of the plant community. Only one of these species is consumed by introduced herbivore. We show that the optimal level of controlling herbivores...
Tipo: Presentation Palavras-chave: Economics; Biological agent; Externality; Spillover; Control; Environmental Economics and Policy.
Ano: 2012 URL: http://purl.umn.edu/124374
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Managing multiple-use resources: optimizing reservoir water use for irrigation and fisheries AgEcon
Tran, Lap Doc; Schilizzi, Steven; Chalak, Morteza; Kingwell, Ross S..
Policy makers in Vietnam face difficult choices when deciding reservoir water management strategies between irrigation and fisheries. In this paper, an economic optimization model for water management is developed to facilitate policy makers' decision making. The model includes the response of rice and fish yields to key factors including reservoir water levels, the timing and quantity of water release, and climatic conditions. The model accounts for variation in rainfall patterns, irrigation requirements, and the demand for low water levels during the fish harvest season. The model is applied to the Daton reservoir in the south of Vietnam to maximize profits in each of three production scenarios where the reservoir's water is used for: (1) only producing...
Tipo: Conference Paper or Presentation Palavras-chave: Multiple-use resources; Reservoir water management; Optimization; Irrigation; Fisheries; And stochastic; Production Economics.
Ano: 2011 URL: http://purl.umn.edu/100721
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Modelling the management of multiple-use reservoirs: Deterministic or stochastic dynamic programming? AgEcon
Tran, Lap Doc; Schilizzi, Steven; Chalak, Morteza; Kingwell, Ross S..
Modelling complex systems such as multiple-use reservoirs can be challenging. A legitimate question for scientists and modellers is how best to model their management under uncertain rainfall. This paper studies whether it is worth using a stochastic model that requires more effort than a much simpler deterministic model. Both models are applied to the management of a multiple-use reservoir in southern Vietnam. Although no single modelling approach is universally superior, this study indicates that the desirable modelling approach is stochastic if reservoir capacity and water use demands have a high enough impact on the optimal timing of reservoir water use.
Tipo: Presentation Palavras-chave: Deterministic dynamic proramming; Stochastic dynamic programming; Water management; Irrigation; Fisheries; Multiple-use reservoir; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2012 URL: http://purl.umn.edu/124463
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Optimal control of a stochastic biological invasion AgEcon
Chalak, Morteza; Pannell, David J..
Although there have been numerous studies on the economics of weed control, relatively few of these studies have focused on natural ecosystems. The aims of this papers are: A) to identify the combination of control options that is optimal for blackberry (Rubus anglocandicans) in Australian natural ecosystems, B) to assess whether an integrated control strategy is superior to chemical-only strategies, C) to evaluate the economic net benefits of specific biologically oriented control methods (a rust and grazing by goats), D) to determine how changes in model parameters affect the optimal control strategy. To address these aims, a stochastic dynamic simulation model and a stochastic dynamic programming model are developed. The results indicate that, while an...
Tipo: Presentation Palavras-chave: Environment; Economics; Weed; Stochastic; Optimisation; Management; Environmental Economics and Policy.
Ano: 2012 URL: http://purl.umn.edu/124373
Registros recuperados: 7
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