Learning from streambank failures at bridge crossings: A biotechnical streambank stabilization project in warm regions
نویسنده
چکیده
In a biotechnical streambank stabilization project, researchers visited and assessed 22 bridge and stream crossings in east half f Texas of the United States. Researchers rarely observed streams in dynamic equilibrium if bridge structures severely interfered ith the streams. Numerous streambank failures were observed and documented. A primary problem noted was the treatment of he edge between the built and natural environment. Failure sites almost always have rigid treatments such as concrete armor on he boundary between the bridge structure and the stream. Such a fixed, rigid treatment could not allow any self-adjustment of tream dimension or profile, which in turn resulted in failures on the bridge structures including piers and abutments. Biotechnical ngineering offers an alternative to treat the edge between built and natural environment and provide a buffer to absorb erosive orces from the flow onto built structures. While these techniques are often used in the cooler areas of the United States, there are ignificant challenges to the application of this technology in warm regions, specifically in the Plant Hardiness Zones 8–10 defined y the U.S. Department of Agriculture. It is primarily because short dormant periods in warm regions restrict the construction eriod for implementing the live cutting technique, an important method in biotechnical engineering. This paper describes a streambank stabilization project implemented in Texas of the United States, where the research team ssessed and analyzed streambank failure causes at bridge crossings in warm regions, and addressed warm region construction ssues encountered during the project. The paper further discusses the design process, implemented result, and monitoring of he built biotechnical streambank stabilization project. 2005 Elsevier B.V. All rights reserved.
منابع مشابه
Dennis A . Lyn , John F . Newton Approaches to the Design of Biotechnical Streambank Stabilization Volume III — Design Guidelines
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