Research on the Interaction of Environmental Factors in the Three Gorges Reservoir Area Based on the Two-layer Network System Dynamics Model

This paper takes the ecological security of the Chongqing Three Gorges Reservoir area as the research object, establishes five subsystems of policy, population, water environment, economy, and biology, and uses the analytic network process to calculate the impact weights of different indicators in each layer of the system. The results show that the weight of the water environment indicator layer is the largest, and other indicators have varying degrees of impact on ecological security. On this basis, construct a system dynamics model, select the main constraints of environmental factors in the Three Gorges Reservoir area, set three different development scenarios, and observe their impact on CODcr And determine the range of ecological safety thresholds.