Table 3 The assessment system of Natech risk triggered by typhoons.
From: Natural hazard triggered technological risks in the Yangtze River Economic Belt, China
Target layer | Evaluation index | Indicator description and classification basis | Grading standards | Weights | Score |
|---|---|---|---|---|---|
Risk source indicators (ST) | Hazard degree of risk enterprise | Hazard degree of risk enterprise in different Q levels of districts or counties (%). Classification according to the Eq. (2) | Equation (2) | 1 | 100 |
Hazard factor indicators of typhoon (HT) | Maximum wind/Maximum speed of typhoon (T1) | The wind speed and grade of typhoons in 1951–2018 were classified (grade or wind speed (m/s)). Classification according to typhoon classification standard of Central Meteorological Station |  < 8 or < 17 | 0.1124 | 30 |
[8, 12) or [17, 30) | 60 | ||||
 ≥ 12 or ≥ 30 | 90 | ||||
Impact of direct landing typhoon (T2) | Frequency of typhoons in counties from 1951 to 2018. Based on the statistical results of the sample data is sorted from small to large, grades are set based on the 20, 60 and 90 percentiles of all samples |  ≤ 1 | 0.1745 | 25 | |
[2, 6) | 50 | ||||
[6, 13) | 75 | ||||
 ≥ 13 | 100 | ||||
Frequency of typhoons (T3) | Frequency of typhoons affected by districts or counties from 1951 to 2018. Based on the statistical results of the sample data is sorted from small to large, grades are set based on the 10, 50 and 90 percentiles of all samples | [1, 3) | 0.2707 | 25 | |
[3, 40) | 50 | ||||
[40, 180) | 75 | ||||
 ≥ 180 | 100 | ||||
Regional precipitation affected during typhoon (T4) | Annual average typhoon rainfall of districts or counties from 2000 to 2018 (mm). Classification according to the 24-h rainfall classification standard of meteorology |  < 25 | 0.3572 | 20 | |
[25, 50) | 40 | ||||
[50, 100) | 60 | ||||
[100, 250) | 80 | ||||
 ≥ 250 | 100 | ||||
Duration of typhoon (T5) | Duration of each typhoon in districts or counties from 1951 to 2018 (days). Based on the statistical results of the sample data is sorted from small to large, grades are set based on the 10, 40 and 80 percentiles of all samples | [3.75, 8.25) | 0.0852 | 25 | |
[8.25, 11.75) | 50 | ||||
[11.75, 16.25) | 75 | ||||
 ≥ 16.25 | 100 |
