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Abstract
Watershed ecological compensation (WEC) mechanisms can help coordinate the distribution of revenue among different regions and realize the collaborative treatment of water pollution. However, limited research has examined the influence of population flow on the design of ecological compensation mechanisms. In this paper, the differential game method is used to construct a model of water pollution control in upstream and downstream regions with the consideration of population flow. The Lower Yellow River Basin (LYRB), which includes Henan and Shandong Provinces, is taken as a case study, and relevant data are used for simulation analysis. The constraints and population flow factors that influence the establishment of a WEC mechanism between upstream and downstream governments are explored. The results show that (1) the implementation of WEC can stimulate the upstream government’s efforts to treat pollutants, and the amount of pollutants eliminated and the revenue of the upstream and downstream governments increase; (2) with the continuous flow of population from the upstream region to the downstream region, the amount of pollutants eliminated and the revenue of the downstream government decrease; and (3) in the absence of external incentive measures, when the population flow exceeds a certain threshold, the WEC mechanism of the upstream and downstream governments cannot be spontaneously carried out. The conclusions of this study can provide scientific guidance for improving the WEC mechanism between the upstream and downstream governments within a basin.
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