Assessment of the effects of regional channel stability and sediment transport on roadway hydraulic structures : final report.
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2014-06-01
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Abstract:Rivers and streams evolve all the time. As a result, no stream channel is absolutely stable. Channels evolve at various speeds both vertically (degradation/aggradation) and horizontally (meander
migration). They also respond to man-made changes ranging from in-stream modifications (such
as bridges) to watershed changes (such as land use change and urbanization). Failure to consider
these dynamics could result in costly repairs and even disastrous collapse. The current practice
of using HEC-RAS in TxDOT to calculate local scour around hydraulic structures does not fully
consider the effects of regional channel stabilities. The lengthy Federal Highway Administration
(FHWA) publications on steam instabilities (e.g., HEC-11, 18, 20, and 23 series) are not consulted
unless risks are apparent. In addition, there are no clear guidelines on how to address the problem
in the current TxDOT Hydraulic Design Manual. A comprehensive investigation of the subject
and synthetic study are needed. This final report is the compilation of all the interim technical
memorandums submitted to TxDOT during the course of this project.
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