Abstract
Based on the randomness and ambiguity characteristics of the river water environment system, as well as the lack and inaccuracy of data information, the water environment system parameters are defined as triangular fuzzy numbers. On this basis, by fuzzing the parameters of the conventional deterministic model, a fuzzy model for calculating river water environmental capacity is established. According to this model, the river water environment capacity in the form of triangular fuzzy numbers can be calculated. According to the requirements of a given level of credibility, the water environment capacity can be further converted from triangular fuzzy numbers to interval values. Research shows that compared with conventional deterministic methods, the results obtained are more scientific and reasonable
Highlights
There have been many studies on water environmental capacity [1,2,3,4,5,6], and some results have played an important role in practice
The river water environment capacity is a dynamic value that changes within a certain range.due to the different probability of each parameter in different conditions, the interval value of river water environment capacity is different from the conventional gray interval number
If the model parameters are expressed as triangular fuzzy numbers, it can better reflect the change characteristics of the water body's pollution holding capacity
Summary
There have been many studies on water environmental capacity [1,2,3,4,5,6], and some results have played an important role in practice. The deterministic model is simple to calculate and easy to operate, it does not pay enough attention to the dynamics and uncertainties of the water environment system, so it is difficult to scientifically and accurately reflect the true pollutionholding capacity of river water bodies. Analyzing and calculating the water environmental capacity of rivers from the perspective of uncertainty has become the development trend of the research on the pollution capacity of water bodies [3,4,5,6]. This paper attempts to use triangular fuzzy numbers in the study of river water environment capacity. On the basis of defining the triangular fuzzy parameters of the water environment system, a fuzzy model for calculating river water environment capacity is established, which provides new ideas for the study of water pollution capacity
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