Practical Research on the Fuzzy Risk of Landfall Typhoon-A case study of Zhejiang province

The simplest way to perform fuzzy risk assessment is to calculate the fuzzy expected value and convert fuzzy risk into non-fuzzy risk, converting it to a clear number. In doing so, there is a transition from a fuzzy set to clear set. Under such an a level, three risk values can be calculated. As a adopts all values throughout the set [0, 1], it is possible to obtain a series of risk values. Therefore, the fuzzy risk can be a multi-valued risk or set-valued risk. Calculation of the fuzzy expected value of landfall typhoon risk in Zhejiang province has been performed based on the interior-outer set model. Selection of an a 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.