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Bridge waterways commonly narrow or constrict natural channels, forcing water to flow through a contracted area, thereby increasing the magnitudes of velocity and turbulent kinetic energy of flow passing through the waterway. If these increases cause erosion of the waterway boundaries, the contracted section may scour.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 971: Revised Clear-Water and Live-Bed Contraction Scour Analysis develops live-bed and clear-water contraction scour equations suitable for use in risk-based bridge design encompassing a wide range of hydraulic conditions, including varying contraction ratios.

Supplemental to the report is NCHRP Web-Only Document 294: Revised Clear-Water and Live-Bed Contraction Scour Analysis Training Manual and a Presentation.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2021. Revised Clear-Water and Live-Bed Contraction Scour Analysis. Washington, DC: The National Academies Press. https://doi.org/10.17226/26198.

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Publication Info

174 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26198
Chapters skim
Front Matter i-viii
Summary 1-4
Chapter 1 - Introduction and Research Approach 5-10
Chapter 2 - Findings 11-38
Chapter 3 - Laboratory Testing Setup and Test Plan 39-48
Chapter 4 - Clear-Water Laboratory Testing Results 49-70
Chapter 5 - Live-Bed Laboratory Testing Results 71-84
Chapter 6 - Rigid-Bed Laboratory Testing Results 85-94
Chapter 7 - Computational Applications 95-108
Chapter 8 - Revised Contraction Scour Analysis: Appraisal, Results, and Applications 109-154
Chapter 9 - Observations, Conclusions, and Suggested Research 155-160
References 161-164
Abbreviations and Acronyms 165-168

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