Environmental Risk Assessment System for Phosphogypsum Tailing Dams

Table 9

The weights of the factors and subfactors.

	Fuzzy weight vector	Defuzzified weights
Characteristics of solid waste (A1)	(0.081,0.091,0.139,0.161)	0.112
Characteristics of environment (A2)	(0.075,0.087,0.132,0.159)	0.108
Tailing dam risk (A3)	(0.117,0.143,0.216,0.264)	0.176
Risk management (A4)	(0.138,0.165,0.260,0.315)	0.209
Utilization prospect (A5)	(0.264,0.323,0.487,0.580)	0.395
Physical characteristic (B1)	(0.185,0.214,0.299,0.369)	0.256
Chemical characteristic (B2)	(0.522,0.632,0.884,1.045)	0.744
Natural environment (B3)	(0.5,0.5,0.5,0.5)	0.5
Social environment (B4)	(0.5,0.5,0.5,0.5)	0.5
Characteristics of dam body (B5)	(0.386,0.487,0.730,0.885)	0.598
Drainage installation (B6)	(0.153,0.174,0.233,0.279)	0.201
Flood drainage facility (B7)	(0.153,0.174,0.233,0.279)	0.201
Risk prevention (B8)	(0.366,0.511,0.851,1.098)	0.650
Emergency response (B9)	(0.211,0.264,0.440,0.634)	0.350
Support of government (B10)	(1/3,1/3,1/3,1/3)	1/3
Using proportion (B11)	(1/3,1/3,1/3,1/3)	1/3
Technology maturity (B12)	(1/3,1/3,1/3,1/3)	1/3
Volatility (C1)	(0.073,0.082,0.119,0.138)	0.100
Solubility (C2)	(0.195,0.218,0.343,0.375)	0.274
Radioactivity (C3)	(0.481,0.516,0.765,0.822)	0.626
Corrosivity (C4)	(0.065,0.080,0.134,0.161)	0.104
Acidity and alkaline (C5)	(0.046,0.053,0.086,0.107)	0.068
Acute toxicity (C6)	(0.323,0.361,0.615,0.687)	0.470
Extraction toxicity (C7)	(0.239,0.271,0.472,0.531)	0.358
Air (C8)	(0.039,0.046,0.073,0.094)	0.053
Soil (C9)	(0.127,0.152,0.351,0.443)	0.230
Geology (C10)	(0.172,0.231,0.661,0.815)	0.403
Hydrology (C11)	(0.127,0.152,0.351,0.443)	0.230
Ecology (C12)	(0.047,0.061,0.125,0.161)	0.084
Population density (C13)	(0.223,0.255,0.332,0.379)	0.291
Industry (C14)	(0.031,0.035,0.049,0.060)	0.043
Agriculture (C15)	(0.071,0.079,0.099,0.112)	0.088
Tourism (C16)	(0.071,0.079,0.099,0.112)	0.088
Animal husbandry (C17)	(0.071,0.079,0.099,0.112)	0.088
Distance of community (C18)	(0.296,0.346,0.464,0.537)	0.402
Seepage line and dry beach length (C19)	(0.270,0.339,0.514,0.631)	0.417
Height and capacity (C20)	(0.050,0.058,0.083,0.102)	0.069
Damming mode (C21)	(0.120,0.151,0.232,0.289)	0.188
Type of tailings (C22)	(0.050,0.058,0.083,0.102)	0.069
Service period (C23)	(0.050,0.058,0.083,0.102)	0.069
Material of dam (C24)	(0.120,0.151,0.232,0.289)	0.188
Returning reservoir (C25)	(0.257,0.329,0.479,0.581)	0.390
Seepage shaft (C26)	(0.257,0.329,0.479,0.581)	0.390
Drainage (C27)	(0.124,0.156,0.269,0.403)	0.220
Flood discharge trench (C28)	(0.5,0.5,0.5,0.5)	0.5
Flood draining facility (C29)	(0.5,0.5,0.5,0.5)	0.5
Revetment construction maintenance (C30)	(0.046,0.058,0.093,0.125)	0.073
Dam safety monitoring (C31)	(0.098,0.129,0.229,0.328)	0.175
Daily management (C32)	(0.153,0.212,0.386,0.543)	0.291
ISO authentication (C33)	(0.258,0.357,0.614,0.804)	0.461
Emergency capacity of rescuing facilities (C34)	(0.185,0.214,0.299,0.369)	0.256
Capacity of emergency protection and eliminating leak (C35)	(0.522,0.632,0.884,1.045)	0.744