Table 4 Test results and calculated values of R (%)
From: Characteristics of reducing local scour around cylindrical pier using a horn-shaped collar
Level | Factor | k | Maximum scour depth around the pier (mm) | R (%) | ||
|---|---|---|---|---|---|---|
W/D | h/D | n | ||||
1 | 1.5 | 0.25 | 1 | 1 | 70 | 2.78 |
2 | 1.5 | 0.5 | 1.5 | 1.4 | 61 | 15.28 |
3 | 1.5 | 0.75 | 2 | 1.5 | 57 | 20.83 |
4 | 1.5 | 1.25 | 3 | 1.25 | 57 | 20.83 |
5 | 1.5 | 1.85 | 4 | 0.93 | 68 | 5.56 |
6 | 2 | 0.25 | 1.5 | 0.25 | 56 | 22.22 |
7 | 2 | 0.5 | 2 | 0.25 | 58 | 19.44 |
8 | 2 | 0.75 | 3 | 0.094 | 52 | 27.78 |
9 | 2 | 1.25 | 4 | 0.039 | 52 | 27.78 |
10 | 2 | 1.85 | 1 | 3.7 | 76 | −5.56 |
11 | 2.5 | 0.25 | 2 | 0.056 | 18 | 75.00 |
12 | 2.5 | 0.5 | 3 | 0.019 | 32 | 55.56 |
13 | 2.5 | 0.75 | 4 | 0.0046 | 38 | 47.22 |
14 | 2.5 | 1.25 | 1 | 1.7 | 69 | 4.17 |
15 | 2.5 | 1.85 | 1.5 | 1.0 | 61 | 15.28 |
16 | 3.5 | 0.25 | 3 | 0.0020 | 4 | 94.44 |
17 | 3.5 | 0.5 | 4 | 0.00040 | 9 | 87.50 |
18 | 3.5 | 0.75 | 1 | 0.60 | 32 | 54.17 |
19 | 3.5 | 1.25 | 1.5 | 0.32 | 33 | 55.56 |
20 | 3.5 | 1.85 | 2 | 0.15 | 45 | 37.50 |
21 | 5 | 0.25 | 4 | 0.00003 | 0 | 100.00 |
22 | 5 | 0.5 | 1 | 0.25 | 0 | 100.00 |
23 | 5 | 0.75 | 1.5 | 0.094 | 0 | 100.00 |
24 | 5 | 1.25 | 2 | 0.039 | 3 | 95.83 |
25 | 5 | 1.85 | 3 | 0.0036 | 24 | 66.67 |
26 | Without collar | - | 72 | - | ||