Environmental Engineering Reference
In-Depth Information
shown in Table 7. For fishing ships, only 7 records are missing and Lloyds 2007 does not document the
fishing ships. The missing speed and power are obtained by using the speed and power of other fishing
ships with the similar or the same NRT and GRT.
Table 6. Relationship among NRT, GRT, and DWT
Ship Type
Number of ships
y as lnNRT, x as lnGRT
R
2
y as lnNRT, x as lnDWT
R
2
Bulk Carrier
10010
y=-0.95+1.04x
0.97
y=-0.92+0.98x
0.98
Container
4776
y=-0.70+1.00x
0.96
y=-1.42+1.05x
0.96
General Cargo
22316
y=-0.71+1.10x
0.98
y=-1.11+1.02x
0.97
Miscellaneous
14120
y=-0.67+1.04x
0.77
y=0.53+0.79x
0.77
Passenger
4390
y=-0.95+1.01x
0.97
y=1.23+0.88x
0.82
Reef
3957
y=-1.27+1.04x
0.95
y=0.13+0.90x
0.92
RoRo
2357
y=-0.66+0.96x
0.96
y=-1.24+1.08x
0.88
Table 7. Relationship among power, speed, and NRT
Ship Type
y as lnPower x as lnNRT
R
2
y as lnSpeed, x1 as lnNRT, x2 as lnPower
R
2
Bulk Carrier
y=3.64+0.56x
0.82
y=1.54-0.03x1+0.16x2
0.51
Container
y=1.27+0.91x
0.90
y=1.11-0.01x1+0.21x2
0.89
General Cargo
y=1.43+0.84x
0.89
y=1.23-0.04x1+0.21x2
0.80
Miscellaneous
y=4.25+0.53x
0.61
y=1.45-0.005x1+0.15x2
0.45
Passenger
y=4.03+0.62x
0.67
y=0.81-0.25x1+0.46x2
0.74
Reef
y=2.10+0.81x
0.84
y=1.13-0.03x1+.0.22x2
0.81
RoRo
y=3.37+0.64x
0.82
y=0.94+0.009x1+0.202x2
0.83
