Handbook for Predicting Stream Meander Migration and Supporting Software (2004) / Chapter Skim
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11.1 INTRODUCTION Problems associated with riverbank erosion and channel migration have plagued societies reliant on engineered river crossings for thousands of years. Engineers have dealt with these problems by attempting to site bridges in particularly stable or laterally constrained reaches, over-engineering bridges to withstand all but catastrophic erosion, or building bridges that are easy to replace.
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For highway engineering purposes, a stream channel can be considered unstable if the rate or magnitude of change is such that the planning, location, design, or maintenance considerations for a highway crossing are significantly affected during the life of the facility. The kinds of changes that are of concern are (1)
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3span rivers and their floodways, only the bents and pilings within the channelized section have deep foundations, whereas those located on the floodplain or marginal to the channel may have shallow foundations. When channel migration removes a significant amount of bankline underneath a bridge, floodplain bents and pilings with shallow foundations may become exposed and undermined and may potentially fail.
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tified early, major floods can cause significant channel migration over the duration of the flood event. In these cases, the U.S.
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