Browsing by Subject "Shallow lake model"

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    Temperature Consideration in the Shallow Lake Model and Its Policy Implications for Eutrophication Governance
    (2024-04-26) Zhao, Yang
    Eutrophication is a significant environmental issue affecting shallow lakes and is closely related to human activities. The shallow lake model serves as an environmental economic model for studying this problem. In this study, we first reviewed the scientific rationale of this economic model, subsequently, analyzed the original shallow lake model proposed by Mäler et al., discussing market failure issues in static optimization based on previous research. We then introduced the factor of temperature to enable the model to consider the effects of seasonal temperature changes and long-term climate warming on eutrophication processes. We conducted an analysis of the shallow lake model incorporating temperature. Analysis of the state equation indicated that temperature variation significantly influences the internal phosphorus release in the water body, with increased temperature leading to the transition of the shallow lake to hysteresis or irreversible states. Analysis of the static optimization problem of shallow lake utility revealed that temperature increase makes it more likely for utility maximization to occur in states with high phosphorus content. Additionally, we explored the existence of emission control strategies under temperature variation scenarios. Finally, based on our study of this environmental economic model, practical policy implications were provided.