Simulation Research on the River Chief System Policy of Region Unit in the Yangtze River Basin
It is the strategic goal of modernization of China's watershed governance system to optimize the power structure of"basin"and"region",and realize the coordinated governance across watersheds,levels,departments and regions.The river chief system clarifies the water management responsibilities of the"administrative unit",but the overall water management responsibilities of the"basin unit"are not clear,and there is a contradiction between the"basin unit"and the"administrative unit".The long-term effect of the"administrative unit"river chief system policy in the Yangtze River basin and whether it can realize the goal of the Yangtze River basin integrative management need scientific verification.Based on the theory of DPSIR,using the method of system dynamics and the software of Vensim PLE,this paper simulates the effects of the"administrative unit"river chief policy in the Yangtze River basin from the three dimensions of water environment governance,water resources utilization and water ecological restoration.The heterogeneity of policy effects in the entire basin and upstream,midstream,and downstream regions before and after policy implementation is compared and analyzed,and the long-term effects of the river chief system policy are predicted.It is found that:① under the existing watershed management system,the short-term effect of the river chief system policy in the Yangtze River basin is obvious,and the long-term policy effect will continue to weaken;② the effect of the river chief system policy has obvious regional heterogeneity,and the overall policy effect of the downstream region is significantly better than that of the upstream region,and the effect of the river chief system policy is positively correlated with the regional economic development level and the attention of local governments;and ③from 2023 to 2035,the overall policy effect of the river chief system in the whole watershed will continue to weaken year by year,the river chief system policy lacks strong sustainability,the policy effect of water environment governance and water ecological restoration shows a downward trend,and the policy effect of water resources utilization shows a slight upward trend.Designing the river chief system of"basin unit",optimizing the power structure of"basin"and"region",and making up the shortage of river chief system of"administrative unit"are the important contents of the reform of the Yangtze River basin management system in the future.
system dynamicssimulationriver chief policythe Yangtze River basinregion unit
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