Study On The Risk Sharing Of The Comprehensive Management Of The Water Environment Based On Public-private Partnership

Water pollution is currently a prominent issue in environmental pollution,and the comprehensive management of the water environment is a key area of environmental protection.In order to implement the State Council’s "Ten Articles on Water",improve the quality of the water environment and restore the function of water ecosystems,various governments are making every effort to promote the comprehensive management of the water environment.The State encourages the adoption of public-private partnership of the comprehensive management of the water environment,which can effectively accelerate the progress of the projects and at the same time bring into play the market mechanism and utilise the advanced technology and experience of social capital for the projects.However,the design,construction and operation of the comprehensive management of the water environment based on public-private partnership are complex and volatile,and the management cycle is long,with a large number of uncertain risks.Theoretical research on risk sharing is relatively weak,and the problem of risk sharing in the practice of the comprehensive management of the water environment based on publicprivate partnership needs to be solved.Therefore,it is of great theoretical value and practical significance to carry out study on the risk sharing of the comprehensive management of the water environment based on public-private partnershipFirst of all,combining the characteristics of the project of the comprehensive management of the water environment and the relevant content of the public-private partnership,the applicability of the combination of them is summarised.The main body of risk sharing of the project is identified as government departments and social capital,and the process of risk sharing is formulated according to the principle of risk sharing,which is divided into initial risk-sharing and re-sharing.Secondly,a comprehensive literature analysis and case studies were conducted to identify 46 risk factors in the comprehensive management of the water environment based on public-private partnership.By constructing an improved TOPSIS risk sharing model,the risk factors were divided into three categories based on the risk bearing capacity of both public and private parties,namely risks borne alone,risks transferred to third parties and risks with similar bearing capacity that need further study.The third category of risk was defined as the proposed shared risk.Then,in order to determine the sharing of the proposed shared risks,an evolutionary game risk re-sharing model is constructed with the objective of maximising the interests of the sharing agents,based on the risk loss considering the risk association,and the evolutionary results of eight different scenarios are analysed.Among them,six situations have a unique evolutionary stabilisation strategy;one situation has two evolutionary stabilisation strategies,when the risk is borne by the party causing the loss;for the remaining one complex situation,simulation analysis and parameter discussion are carried out to provide ideas for promoting mutual sharing.Finally,taking a comprehensive management of the water environment based on public-private partnership in a district of Chongqing as an example,37 risk factors were identified based on risk identification research results,and risk sharing work was carried out for this.In the risk reallocation process,the evolutionary results were compared between intuitive losses and losses considering risk association,and then combined with simulations to find that different risk control benefits,actual costs and initial costs may cause the evolutionary results to shift in different situations,ultimately leading to different allocation results for the same risk.The results show that 8 risks are borne by government departments,14 risks are borne by social capital,8 risks are shared by both parties,5 risks are borne by the party causing the loss,and 2 risks are transferred to third parties.Based on the results,risk countermeasures were then developed and risk prevention advice was provided to the parties of risk sharing.