Coupling Relationship Research On Basin Water Resources Allocation And Evolution Of Water Environmental Security

Water resources is one of the most important factors restricting the sustainabledevelopment of human society, water security is directly related to the the nation’sstability and the human health. In recent decades, China formed a hitherto unknownscale of using water, appear the situation of water resources shortage, the waterpollution is worsening, and the deterioration of water ecological, the problem of waterenvironment security is becoming more and more serious, and the rational allocation ofwater resources is an important measure to guarantee sustainable utilization of waterresources and water environment security. This paper is about coupling relationshipresearch on basin water resources allocation and evolution of water environmentalsecurity, and obtain the following results:Overview of the research progress of water resources allocation and waterenvironment safety at home and abroad, and it analyzes the problem of present waterresources allocation and evaluation of water environment safety. Combined with thetheory of dualistic water cycle, describes the coupling relationship between theallocation of water resources and the evolution of water environment security, putforward the optimization control theory of water resources allocation based on thedynamic evolvement of water environment safety. It points out that we should adjustthe water resources allocation scheme being carried out or will be carried out in realtime according to the evolution of water environment security dynamically.Taking the Songhua River basin as an example, identify the driving mechanism ofthe water environment safety evolution, and analyze the evolution trend of waterenvironment security. Combined with the water resources allocation situation ofSonghua River basin and the security situation of the water environment quality, fourkinds of water environment security driving mechanism was analyzed, they are balanceof water resources supply and demand, the factor of climate, underlying surface condition, pollutant emissions. And it predicts the evolution trends of four types ofwater environment safety driving factors at present level.The evaluation model of water environment security was built based on waterresources allocation, and establish the water environment safety evaluation indexsystem of Songhua River basin. To evaluate the water environment safety from foursubsystems, they are the social and economic security, water ecological security, waterquantity security, water quality security, and selected15evaluation indexes. Determinethe evaluation criteria, calculate the sub degree of safety for each index throughimproved linear standard methods, and determine the weight of each subsystem andeach index by AHP, and using the comprehensive index method to calculate the totaldegree of safety.The model was applied according to cycle iterative method of "the allocationscheme-water environment safety evaluation-feedback-regulate and control scheme".According to the dynamic feedback results of water environment security evaluation,put forward a regulated countermeasures to the Songhua River basin (7partition)waterresources allocation schemes, and optimize three sets of water resources allocationschemes of the Songhua River basin gradually, they are the basic scheme of waterresources allocation, the water-saving scheme of total amount control, the water qualityand quantity optimization scheme.Put forward the water environment security countermeasure of Songhua River basin.According to the water environment security problems of Songhua River basin thatcorresponding to different water resources allocation schemes, it puts forwardcorresponding measures engineering and non engineering.