Evaluation of Bridge Scour Research: Pier Scour Processes and Predictions (2011) / Chapter Skim
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Pages 128-139
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126 CHAPTER 8 RESEARCH NEEDS 8.1 Introduction The longevity of pier scour as a research topic reflects the potential complexities of the flow field and erosion processes involved. The flow field is highly three-dimensional, marked by a set of interacting turbulence structures, unsteady, and varies with pier form and size, flow depth and the erodibility of pier foundation material.
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127 8.2.1 Design Issues The following research topics aim at design method improvements: 1. Piers in the transition- through wide-pier categories.
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128 8.2.2 Scour Processes The research topics listed below aim at better understanding of scour processes in order to improve design methods: 1. Flow Field.
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129 2. Erosion of Foundation Material.
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130 8.3 Research Needs for Complex Pier Forms and Site Factors Table 8-3 lists research needs whose resolution would advance the design methodology recommended in Chapter 7 for piers whose form is more complex than a single column or which face more complicating site factors; i.e., 1. Piers of common form (column, pile cap, piles, or spread footing)
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131 selected common pier forms especially prone to debris accumulation (e.g., pier bents)
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132 a. Abutment proximity.
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133 b. Confirming whether or not pier scour in various rock types attains greater potential maximum depths than scour in cohesionless sediments.
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134 Table 8-1 Priority range for research needs (Adapted from NCHRP Project 24-8 (Parola et al.
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135 Table 8-2 Research topics and priorities for single-column piers Topics Priority DESIGN ISSUES 1. Estimation of potential maximum scour depth for piers in the changeover range from transition- to wide-pier categories, especially for live-bed conditions Critical 2.
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136 Table 8-3 Research topics and priorities for considerations complicating scour-depth estimation Topics Priority DESIGN ISSUES – COMMON PIER FORMS 1. Reliable shape and alignment factors for common pier forms.
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137 iv. Flow field interaction with channel features Medium 2.
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