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Chapter 6 - Analysis of the test results
Max. scour h s,max [m]
0.5
0.4
0.3
0.2
0.1
First scour
Second scour
Regression line (first scour)
Regression line (second scour)
y = 1.123x + 0.156
R 2 = 0.838
y = 0.933x + 0.175
R 2 = 0.723
8
0.0
0.00 0.05 0.10 0.15 0.20 0.25
Discharge Q [m 3 /s]
Max. rel. scour (h s /h m ) [-]
6
4
2
Peter
y = -11.973x + 4.227
R 2 = 0.405
y = -8.368x + 3.716
R 2 = 0.546
Hersberger
0
0.00 0.05 0.10 0.15 0.20 0.25
Discharge Q [m 3 /s]
Figure 6.1: Absolute (on top) and relative scour depth (bottom) as a function of the discharge (without macroroughness
tests, with Peters tests)
8
Max. rel. scour (h s /h m ) [-]
6
4
2
y = 208.299x + 1.682
R 2 = 0.480
y = 122.254x + 2.135
R 2 = 0.448
First scour
Second scour
Regression line (first scour)
Regression line (second scour)
0
0.0% 0.5% 1.0% 1.5% 2.0% 2.5%
Energy slope S e [%]
Figure 6.2: Relative scour depth as a function of the energy slope S e over the whole channel (without macro-roughness
tests, with Peters tests)
page 116 / November 9, 2002
Wall roughness effects on flow and scouring