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Harmony issues are widespread in human society and nature. To analyze these issues, harmony theory has been proposed as the main theoretical approach for the study of interpersonal relationships and relationships between humans and nature. Therefore, it is of great importance to study harmony theory. After briefly introducing the basic concepts of harmony theory, this paper expounds the five elements that are essential for the quantitative description of harmony issues in water resources management: harmony participant, harmony objective, harmony regulation, harmony factor, and harmony action. A basic mathematical equation for the harmony degree, that is, a quantitative expression of harmony issues, is introduced in the paper: HD =  ai  −  bj , where  a  is the uniform degree,  b  is the difference degree,  i  is the harmony coefficient, and  j  is the disharmony coefficient. This paper also discusses harmony assessment and harmony regulation and introduces some application examples.

Description and Application of a Mathematical Method for the Analysis of Harmony