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Table 2 The safety index system in the inland channel navigating environment

From: A risk evaluation model for channel navigation based on the gray-fuzzy theory

First-level evaluation factor Second-level evaluation factor
Natural environment Y1 Wind X1
Current X3
Visibility X5
channel environment Y2 Depth of channel X7
Width of channel X8
Channel bending X10
Obstruction X11
Turning point X13
Channel intersection X14
Traffic environment Y3 Traffic flow X15
Navigation facilities X17
VTS coverage X19