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SPECIAL GEOTECHNICAL ENGINEERING PROBLEMS WITH CHANNEL SLOPES

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032031,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13756) @2003
Authors:   D.K. McCook
Keywords:   Sapping, slope stability, seepage, piping, dispersive clay, blocky structure

Bioengineering is most effective in protecting bank soils from the erosive forces of flowing water acting against otherwise unprotected streambanks. Bioengineering measures increase stream roughness and slow the water velocity near the slope face. They also provide armoring and reinforcement of the surface soils. However, some problems with instability and excessive erosion of streambanks are not readily solved by bioengineering techniques alone. Problems involving rotational failures of streambanks, piping /sapping of bank soils, and shallow slides in highly plastic soils are difficult to solve using only bioengineering techniques. Erosion on streambanks in highly dispersive clay soils also cannot be addressed with bioengineering measures alone. Engineers and planners must recognize and understand these special instability problems with underlying geotechnical causes.

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