Abstract:

As the traditional matter-element method has many indexes for water safety assessment, many correlation functions are necessary for design, which will lead to great inconvenience. In order to reduce the number of the designed correlation function and to normalize the correlation function, the matter-element assessment model of water safety was studied based on normalized indexes values. On the basis of setting index reference values of 23 common indexes and normalizing transformation for indexes, the 23 common indexes were classified into 5 categories according to the subsystems, and similar indexes were designed for the same correlation function, which could greatly reduce the work of design and calculation. Taking Shandong Province as an example, the application of the matter-element model was proposed based on normalized index values to assess the water safety in details. Furthermore, the results were compared with that of the attribute recognition theory. The comparison results showed that the matter-element model based on normalized index values was an effective assessment and analysis method with simplicity, practicability and reliability.

Key words: reference values, normalized index values, matter-element model, correlation function, water safety, assessment model