In Table 10, we can see that every number is smaller than 1, so when we calculate the weight, we can skip Step 1 in Section 5.1, with Steps 2–4 in Section 5.1 we calculate the information entropy E, the results are shown in Table 11 (we only put T value to calculate).

Table 11

E-value of offshore oil platform

First-gradeWeightSecond-gradeWeight
Oil overflow 0.0065   
Oil characteristics 0.2737 Toxicity 0.1902 
Persistence 0.2299 
Flammability 0.3870 
Viscosity 0.1929 
Oil spill location 0.5357 Sea sensitive resources 0.0248 
Offshore distance 0.0248 
Coastal area category 0.9504 
Meteorological elements 0.1114 Wind speed 0.3963 
Visibility 0.6037 
Hydrological elements 0.0728 Surface velocity 0.1186 
Surface flow direction 0.2396 
Surface water temperature 0.0085 
Wave height 0.6333 
First-gradeWeightSecond-gradeWeight
Oil overflow 0.0065   
Oil characteristics 0.2737 Toxicity 0.1902 
Persistence 0.2299 
Flammability 0.3870 
Viscosity 0.1929 
Oil spill location 0.5357 Sea sensitive resources 0.0248 
Offshore distance 0.0248 
Coastal area category 0.9504 
Meteorological elements 0.1114 Wind speed 0.3963 
Visibility 0.6037 
Hydrological elements 0.0728 Surface velocity 0.1186 
Surface flow direction 0.2396 
Surface water temperature 0.0085 
Wave height 0.6333 
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