Evaluation of Bridge Scour Research: Pier Scour Processes and Predictions (2011) / Chapter Skim
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Pages 140-146
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From page 140... ...
138 CHAPTER 9 CONCLUSIONS 9.1 Introduction This chapter presents the evaluation's main conclusions, which link to the following considerations outlined in Section 1.4: 1. The flow field and the potential maximum scour depth, at a pier scale, change in accordance with three variables – effective pier width, flow depth, and erodibility of the foundation material in which the pier is sited.
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139 Several factors alter pier flow fields and complicate design estimation of pier scour. Factors affecting pier flow field include flow influences exerted by increased complexity of pier geometry, adjoining bridge components (abutment or submerged bridge deck)
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140 other words, more work is needed to define the systematic changes in the flow fields associated with the narrow- , transition-, and wide-pier categories of pier scour. Figures 3-4, 3-5, and 3-6 illustrate the flow fields associated with the three categories, respectively; ii.
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From page 143... ...
141 The evaluation also explains the limiting extents to which parameter influences can be isolated from each other. Some variables exert multiple influences.
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From page 144... ...
142 The methodology enables the designer to account for the scour processes, yet also recognize the limits of existing semi-empirical methods for scour-depth estimation. The leading semi-empirical methods (Sheppard-Melville, Richardson and Davis)
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143 Table 9-1 Summary of proposed structured design methodology Pier Design Complexity (Pier Form and/or Pier Site) Design Method i.
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144 The present version of HEC-18 should recommend the use of the current method (Richardson and Davis, 2001) and the Sheppard-Melvile method.
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