Revised Clear-Water and Live-Bed Contraction Scour Analysis (2021) / Chapter Skim
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From page 85... ...
6-1 6.1 Overview Rigid-boundary hydraulics of contracted reaches have not been adequately addressed in previous laboratory studies. A series of rigid-bed tests at contraction ratio B2/B1 = 0.25 (Severe contraction)
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From page 86... ...
6-2 Revised Clear-Water and Live-Bed Contraction Scour Analysis a. Contraction entrance b.
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From page 87... ...
Rigid-Bed Laboratory Testing Results 6-3 Test RB_0.25-0.65 -1.0 -0.5 0.0 0.5 1.0 0 10 20 30 40 50 60 70 80 90 100 El ev ati on ( ft) Station (ft)
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From page 88... ...
6-4 Revised Clear-Water and Live-Bed Contraction Scour Analysis cross sections in the vicinity of the contraction throat. Vx, Vy, and Vz velocity components were recorded at six-tenths flow depth at a frequency of 40 Hz for approximately 25 seconds at each location.
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From page 89... ...
Rigid-Bed Laboratory Testing Results 6-5 0.0 0.5 1.0 1.5 2.0 2.5 0.00 2.00 4.00 6.00 8.00 Vx , ft /s Lateral location, ft CW_0.25-0.55 rigid bed Vx sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 0.00 2.00 4.00 6.00 8.00 Vy , ft /s Lateral location, ft CW_0.25-0.55 rigid bed Vy sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.00 2.00 4.00 6.00 8.00 Vz , ft /s Lateral location, ft CW_0.25-0.55 rigid bed Vz sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 Figure 6-4 (a)
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From page 90... ...
6-6 Revised Clear-Water and Live-Bed Contraction Scour Analysis 0.0 0.5 1.0 1.5 2.0 2.5 0.00 2.00 4.00 6.00 8.00 Vx , ft /s Lateral location, ft CW_0.25-0.65 rigid bed Vx sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 0.00 2.00 4.00 6.00 8.00 Vy , ft /s Lateral location, ft CW_0.25-0.65 rigid bed Vy sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.00 2.00 4.00 6.00 8.00 Vz , ft /s Lateral location, ft CW_0.25-0.65 rigid bed Vz sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 Figure 6-4 (b)
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From page 91... ...
Rigid-Bed Laboratory Testing Results 6-7 0.0 0.5 1.0 1.5 2.0 2.5 0.00 2.00 4.00 6.00 8.00 Vx , ft /s Lateral location, ft sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 0.00 2.00 4.00 6.00 8.00 Vy , ft /s Lateral location, ft sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.00 2.00 4.00 6.00 8.00 Vz , ft /s Lateral location, ft sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 CW_0.25-0.75 rigid bed Vx CW_0.25-0.75 rigid bed Vy CW_0.25-0.75 rigid bed Vz Figure 6-4 (c)
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From page 92... ...
6-8 Revised Clear-Water and Live-Bed Contraction Scour Analysis sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 0.0 0.5 1.0 1.5 2.0 2.5 0.00 2.00 4.00 6.00 8.00 Vx , ft /s Lateral location, ft CW_0.25-0.80 rigid bed Vx -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 0.00 2.00 4.00 6.00 8.00 Vy , ft /s Lateral location, ft sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 CW_0.25-0.80 rigid bed Vy -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.00 2.00 4.00 6.00 8.00 Vz , ft /s Lateral location, ft sta 1 sta 2 sta 3 sta 4 sta 4.5 sta 5 sta 5.5 sta 6 CW_0.25-0.80 rigid bed Vz Figure 6-4 (d)
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From page 93... ...
Rigid-Bed Laboratory Testing Results 6-9 Figure 6-5. Dye trace at the entrance to the contraction during a rigid-bed test.
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