United States Department of Transportation
i
Evaluating the Success of Meeting Design Objectives on Previously Constructed OOS Stream Stability Projects
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2018-08-01
[PDF-5.79 MB]
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Abstract:The ability to detect failure or impending failure of a stream stabilization project or its components is important to assuring that the bridge will be protected during high flow events. The objectives of this project were to assess the degrees of success of stream channel transition designs through bridge reaches and the suitability of these projects to transport sediment through the bridge opening. In addition to creating a methodology for assessing existing transitions, a methodology was developed that guides the design type selection process at new bridges or new channel transition projects. This process uses a rapid channel stability assessment to initially assess a site for instabilities that need to be addressed by the design. Two design checks are included as part of the method. The first check is the V/Vc analysis for assessing general trends in sediment mobilization through the bridge opening. Due to the use in this study of one dimensional HEC-RAS models to provide inputs for channel depth and velocity, the V/Vc results provide only an average-based mobilization. The second design check is the Failure Modes and Effects Analysis. This requires the designer to systematically analyze all the potential failure modes of the design and to consider solutions that reduce the risk priority numbers of design components. Incorporating these checks in the design process should help increase the likelihood of a successful channel transition design. Several observations and recommendations were made based on field observations at a limited number of sites, comparisons of imagery, and analyses described in this report.
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