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Table 2 Maximum change in sand layer thickness

From: Rationality in pier geometry of Kintaikyo Bridge from viewpoint of river engineering

Pier geometry Maximum scour (mm) Maximum sedimentation (mm)
Each expt Mean
(95% CI)
Each expt Mean
(95% CI)
Without pier (flat) − 12.4 − 4.7
(23.71)
18.0 6.8
(18.96, 20.65)
− 10.0 7.6
− 15.6 7.6
Spindle − 38.0 − 39.1
(3.04)
10.0 8.7
(5.74)
− 38.8 10.0
− 40.4 10.0
Spindle tilted by 12.75° − 40.4 − 40.7
(3.04)
13.2 7.9
(11.64)
− 40.4 11.6
− 42.0 14.0
Current − 42.0 − 41.7
(1.15)
13.2 10.8
(1.19)
− 41.2 11.6
− 42.0 10.0
Oval − 37.2 − 40.4
(7.95)
18.0 11.1
(15.44)
− 42.0 10.8
− 43.6 13.2
Non-regular hexagon − 38.8 − 39.3
(2.29)
10.0 10.0
(1.99)
− 40.4 10.8
− 41.2 10.8
  1. Values in parentheses represent 95% CI