Risk Analysis of Water Resource Based on Possibility-probability Distribution

To perform fuzzy risk assessment, the simplest way is to calculate the fuzzy expected value and convert fuzzy risk into non-fuzzy risk, i. e., a crisp value. In doing so, there is a transition from a fuzzy set to crisp set. Therefore, the fuzzy risk can be a multi-valued risk or set-valued risk. Calculation of the fuzzy expected value of Yiwu city´s water resource risk has been performed based on the interior-outer set model. Selection of an ¿ value depends on the confidence in different groups of people, while selection of a conservative risk value or venture risk value depends on the risk preference of these people.