Study on Urban Water Security Evaluation Based on the Vague Set Similarity Model

Urban water security comprehensive evaluation is complex, vague and multifarious. This paper presents a Vague set-based water security evaluation methodology by building a Vague set similarity model. AHP and Delphi methods are used to give weights to indexes and evaluate the urban water security assurance. A western city is used as an example for the empirical study. In the nine indexes for water security evaluation, the values for socio-economic environment and pressure are 0.24 and 0.41 respectively, which indicates that the city has relatively large socio-economic pressures. The WSAI values of the resource index and environment pressure for water are 0.94 and 0.96. The relatively high figures show that water resources are fully exploited and its environment is relatively well-protected. Vague set similarity model can be used to quantitatively evaluate the water security support degree.