Research On Investment Strategy Of Water Pollution Control In River Basin

Since the reform and opening up,China's national economy has maintained continuous,stable and rapid development.The economic construction has made unprecedented achievements.In 2010,the total amount of GDP in China surpassed Japan and became the second largest economy in the world.The total economic output in 2017 was over 80 trillion yuan.The great economic development is at the cost of the ecological environment cost.Water environment pollution has become a trigger for regional conflicts and social conflicts,which has extremely adverse impacts on social public security.Transboundary water pollution has become the government's basic livelihood issues,which is related to the vital interests of every citizen.Based on the researches of scholars in relevant fields at home and abroad,this research draws lessons from the advanced experience and theoretical methods,and explores and analyzes the strategy of transboundary pollution investment in the basin.Using the theory of differential game and the method of dynamic programming,this research studies the investment decision-making problems of four kinds of pollution control under three different modes.Establish economicmathematical model,the optimal solution is derived and solved under various modes equilibrium.Through the numerical simulation,the optimal pollutant emissions,investment in pollution control,income function,pollutant inventory trajectory and profit under independent investment decision mode,ecological compensation mechanism investment mode,Individual investment decision mode and cooperative investment decision mode are obtained.The comparison and analysis of the decision-making state of the pollution control investment under different circumstances is carried out,and the results are as follows:First,compared with independent investment decision-making,ecological compensation investment decision-making and individual investment decision-making model,the optimal emission rate of cooperative investment decision-making mode decreased by 2.6%.Second,in terms of investment in pollution control,the level of investment under cooperative investment decision-making is much higher than in other situations.Compared with the independent investment decision,the investment under cooperative investment decision increased by 39.53%.Compared with the eco-compensation mechanism investment pattern,the cooperative investment increased by 97.95%.Compared with the individual investment pattern,the cooperative investment increased by 34.03%.Third,in the short term,the stock of water pollution in the four typesof investment increases with time,and the rate of increase is different.In the long term,the amount of pollutants in the basin tends to be stable.Compared with the other three models,the cooperative investment decision-making mode can reduce the quantity of pollutants and achieve a lower stock status in the long run.Fourth,in the short term,the industrial profits of the independent investment mode,the ecological compensation mechanism investment mode and the individual investment mode are higher than those of the cooperative investment mode.But in the long run,with the change of time,the industrial profits of the four investment modes tend to be stable.The long-term profits of the cooperative investment decision-making mode are significantly higher than those of the other three cases.It is found that the cooperative investment decision is a reasonable and effective mode of reducing emission and pollution control.A cooperative decision making department or institution is set up in a watershed where water pollution is serious,and a joint pollution control investment plan is formulated to form a scientific and reasonable investment strategy for pollutant discharge and pollution control so as to achieve double purposes of emission reduction and pollution control.