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Chapter 6 - Analysis of the test results
With a somewhat wider grain size distribution ( σ = 3.21 ), Peter (1986) observed for the deepest
scour similar relationships ( d ma, 12, o ≈ 2 ⋅ d m and d ma, 12, i ≈ 0.8…1 ⋅ d m ).
d in [mm]
UPSTREAM
OUTSIDE
UPSTREAM
INSIDE
DOWNSTREAM
OUTSIDE
DOWNSTREAM
INSIDE
SAMPLE TAKEN
AT OUTLET
ID
d m
d 90
d m
d 90
d m
d 90
d m
d 90
d m
d 90
B1b
B1c
B1d
16.3
18.5
15.8
20.4
21.2
20.4
5.0
5.4
7.0
5.5
6.3
7.8
14.5
16.1
17.3
19.0
20.7
24.6
5.0
4.9
4.8
5.5
5.4
5.4
9.1
15.2
14.8
21.5
B2b
B2c
B2d
23.4
24.9
25.0
29.1
29.2
29.2
9.9
6.7
7.3
12.9
7.6
7.9
20.9
23.4
24.1
27.6
28.2
28.7
8.5
8.0
6.6
10.6
9.7
7.6
12.1
10.9
14.0
18.8
15.9
21.3
B3b
B3c
B3d
15.2
17.0
17.7
20.0
20.5
20.9
5.7
4.8
4.6
6.6
5.3
5.3
15.9
16.3
16.0
20.4
20.3
19.8
5.7
5.4
5.0
7.2
6.2
5.5
7.9
7.6
7.8
11.6
11.1
12.1
B4b
B4c
B4d
15.6
17.9
15.7
19.8
20.9
19.9
7.0
4.9
7.4
9.3
5.4
12.1
16.1
15.9
16.2
20.5
20.5
20.3
8.4
6.2
8.2
13.7
7.6
13.9
8.0
9.4
8.3
13.2
13.8
12.9
C1b
C1c
C1d
15.9
16.2
16.7
20.1
20.3
20.0
5.4
5.4
5.4
6.4
6.2
5.8
15.3
14.8
13.6
19.7
19.6
18.6
5.1
5.8
4.7
5.5
6.9
5.3
7.5
5.9
11.4
7.6
C2b
C2c
C2d
18.2
17.9
18.2
20.9
20.8
20.9
4.8
5.4
5.6
5.4
6.1
6.6
16.1
16.1
16.7
20.2
19.5
20.3
6.5
5.9
4.9
9.4
7.2
5.4
7.4
8.0
16.7
10.1
10.9
20.3
C3b
C3c
C3d
17.5
18.7
18.2
20.7
21.1
20.9
4.6
4.6
5.4
5.2
5.3
5.9
15.0
16.2
16.6
19.3
20.2
20.2
7.0
5.2
5.6
10.3
6.4
6.5
6.8
6.5
7.6
9.8
9.5
11.2
C4b
C4c
C4d
17.1
17.7
17.2
20.8
20.8
20.7
4.9
5.3
4.9
5.4
6.1
5.4
16.4
16.3
15.3
20.3
20.2
19.5
11.2
8.7
8.9
17.2
15.1
16.1
7.9
7.5
9.6
12.5
11.7
14.3
D1b
D1c
D1d
D2b
D2c
D2d
D3b
D3c
D3d
D4b
D4c
D4d
Table 6.5:
14.8
15.5
16.8
13.3
16.4
16.0
13.1
16.1
17.0
13.8
16.7
17.7
20.0
19.0
20.6
19.1
20.2
20.0
17.6
20.0
20.4
17.8
20.3
20.8
6.7
5.1
6.1
5.5
5.2
5.0
9.6
4.5
4.8
9.0
6.1
4.7
8.5
5.5
7.5
6.6
5.7
5.4
13.7
5.1
5.3
13.7
7.3
5.3
14.9
15.6
16.2
14.3
15.4
15.5
15.6
16.1
15.8
15.5
16.0
15.6
19.6
19.5
19.9
18.9
19.3
19.5
20.0
19.9
19.6
19.9
20.2
19.3
5.4
5.2
4.8
6.0
5.3
4.9
6.1
5.5
5.2
8.2
6.9
6.0
6.6
5.6
5.4
7.5
6.1
5.4
7.7
6.5
5.6
12.8
9.0
7.2
6.9
7.3
8.4
8.1
10.4
8.0
8.2
10.7
9.1
7.6
9.1
-
d m and d 90 for the sediment samples of the armoring layer after the tests and at the outlet
10.0
10.9
14.1
12.7
15.2
11.9
13.8
15.1
13.9
11.6
14.4
-
page 136 / November 9, 2002
Wall roughness effects on flow and scouring