Water security comprehensive evaluation model based on comprehensive weight and improved matter-element

As a multi-objective decision-making system, water security evaluation is suitable for the evaluation with a matter-element model. However, in the traditional matter-element model, the eigenvalue of matter-element cannot be calculated when it is beyond the range of nodes, and the calculation process is complex and error-prone. In this paper, improved analytic hierarchy process with entropy weight were combined to calculate the water security comprehensive evaluation index weight, avoiding the over-subjective or over-objective weight value. The normalization of matter-element improves the rationality of the matter-element correlation function and expands the application scope of the model, while the standardization of comprehensive proximity improves the accuracy of model results. Guangdong Province was taken as an example to verify the practicability of the model in the evaluation of the water security comprehensive index. The results show that from 2004 to 2019, the overall water security of Guangdong Province showed a trend rising from deteriorated grade to safe grade and the model results were in line with the facts. As a result, the water security comprehensive evaluation model based on comprehensive weight and improved matter-element is simple, practical, and suitable for the multi-level and multi-factor regional water security comprehensive evaluation.