Evaluation on the evolution of water resources security degree in Hebei Province based on DPSIR-game theory combined weighting TOPSIS model

Based on the DPSIR model, the evaluation system of water resources security degree was preliminarily constructed. By collecting relevant data of Hebei Province, the correlation analysis and screening of the primary evaluation indexes were carried out to determine the evaluation system of water resources security degree. The TOPSIS model combined with the variation coefficient method and the rank sum ratio method was introduced to comprehensively evaluate the water resources security degree of Hebei Province from 2001 to 2020, and the evaluation results were diagnosed with obstacle factors.The results showed that the relative closeness of water resources security degree in Hebei Province increased from 0.217 to 0.745 from 2001 to 2020, from extremely low to high, and reached a medium level as a whole. From 2001 to 2007, the level of water resources security degree was grade V. From 2008 to 2010, the level of water resources security degree reached grade IV.From 2011 to 2012, the level of water resources security reached grade III.From the end of 2014, the progress has been increasing year by year, which was closely related to the increase of the proportion of cross-basin water supply in the response subsystem. From the weight calculation results, it was concluded that the response subsystem was the main subsystem affecting the water resources security degree of Hebei Province, and the obstacle degree of the proportion index of inter-basin water supply was the highest, indicating that the proportion of inter-basin water supply was the primary obstacle factor affecting the water resources security degree.In order to further improve the situation of water resources security degree in Hebei Province, it was necessary to optimize the allocation of water resources and alleviate the pressure of water resources. The biological treatment and physical and chemical treatment technology, are adopted, the process flow, is optimize the economic structure and industrial structure, are adjusted, and improve labor productivity is improved ; it was necessary to advocate residents to improve their lifestyles and reduce the use of cleaners and detergents containing chemical substances. At the same time, it was necessary to improve the efficiency of water resources utilization and promote the circular economy model. The DPSIR-game theory combined weighting TOPSIS model had good objectivity and applicability for the evaluation of water resources security evolution, and was of great significance to the development of economy, society and ecological environment in the region. The research results provided a reference for the rational development, utilization and management of water resources in Hebei Province in the future.