Evaluation of Bridge Scour Research: Geomorphic Processes and Predictions (2011) / Chapter Skim
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3.1 3. RESEARCH PRIORITIZATION AND EVALUATION 3.1 Research Prioritization The purpose of Task 3 was to critically review the research literature compiled in Task 2 (the annotated bibliography in Appendix A)
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3.2 Finally, the 60 publications from all 7 topics were prioritized for the in-depth review under Task 4. Many of the documents that have been removed were superseded by later papers by the same author(s)
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3.3 the answer to this question includes a discussion of whether the research is a Level 1, 2, or 3 approach. Questions 2 and 3 were combined because adequately describing the physical process is a requirement for being founded in sound scientific theory.
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3.4 Table 3.3. Strengths and Weaknesses of Recommended Methods in Geomorphology Topic.
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3.5 Table 3.3. Strengths and Weaknesses of Recommended Methods in Geomorphology Topic.
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3.6 Therefore, per Task 2 of this project, a bibliography was completed that included research literature conducted since 1990 covering Reconnaissance and related topics. Of the 8 Reconnaissance research references submitted, the 4 that are recommended for inclusion are: Assessment of channel stability at bridges in physiographic regions Geomorphic analysis of large alluvial rivers based on widely accepted classification and analysis techniques Digital mapping at bridge sites for detailed, advanced reconnaissance and monitoring Diagnostic approach to assessing and monitoring stream channels Table 3.4.
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3.7 deficiency results when there is an imbalance between the sediment supply and the sediment transport capacity in a river reach. The reasons for this imbalance include reservoirs, urbanization, and other land use changes.
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3.8 Lateral migration in a bridge reach can pose a geomorphic hazard through altering the alignment of the channel relative to the bridge, generating scour adjacent to one of the abutments and in severe cases threatening to flank the bridge entirely. It also generates additional sediment load and recruits large woody debris that may increase the risk of partial or complete blockage.
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3.9 Table 3.6. Strengths and Weaknesses of Recommended Methods in Channel Migration Topic.
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3.10 Table 3.7. Strengths and Weaknesses of Recommended Methods in Change in Channel Width Topic.
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3.11 thread channel. Even when sediment supply matches sediment transport capacity, channels migrate by eroding banks and depositing sediment at point bars.
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3.12 Table 3.9. Strengths and Weaknesses of Recommended Methods in Numerical Modeling Topic.
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