Pier and Contraction Scour in Cohesive Soils (2004) / Chapter Skim
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Pages 68-75
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From page 68... ...
and then reading the initial scour rate on the erosion function obtained in the EFA test. Therefore, the problem of obtaining the initial rate of contraction scour is brought back to the problem of obtaining the maximum shear stress in the contracted channel before scour starts.
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From page 69... ...
Initial bed shear stress distribution (N/m2)
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From page 70... ...
Initial bed shear stress distribution (N/m2)
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From page 71... ...
Initial bed shear stress distribution (N/m2)
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From page 72... ...
In fact, the water depth is already included in the equation through the hydraulic radius of Equation 8.1. 8.6 MAXIMUM SHEAR STRESS EQUATION FOR CONTRACTION SCOUR The influence of four parameters on the maximum shear stress and its location near a channel contraction was investi
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From page 73... ...
The correction factor kc − H for the water depth influence was found to be equal to 1. The proposed equation for calculating the maximum shear stress within the contracted length of a channel along its centerline is where • γ is the unit weight of water (kN/m3)
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From page 74... ...
• θ is the contraction transition angle (in degrees) (Figure 8.13)
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From page 75... ...
Figures 8.15 and 8.16 give the location of the maximum shear stress along the centerline of the contracted channel. Figure 8.15 shows the influence of the transition angle, and Figure 8.16 shows the influence of the contraction ratio.
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