Assessment of channel dynamics,in-stream structures and post-project channel adjustments in North Carolina and its implications to effective stream restoration |
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Authors: | Jerry R Miller R Craig Kochel |
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Institution: | (1) Institute of Watershed Research and Management, Western Carolina University, Cullowhee, NC 28723, USA;(2) Department of Geology and Environmental Center, Bucknell University, Lewisburg, PA 17837, USA |
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Abstract: | Site assessment and monitoring data were analyzed for 26 stream restoration projects in North Carolina where the channel was
reconfigured. Post-project changes in channel capacity were highly variable from site to site, but more than 60% of the projects
underwent, on average at a given site, at least a 20% change in channel capacity. An analysis of site and basin geomorphology
revealed that large post-construction adjustments were associated with highly dynamic stream channels characterized by a combination
of high sediment transport capacity, large sediment supply, and/or easily eroded bank materials. In-stream structures along
dynamic, reconfigured channels also exhibited high incidences of damage. Thus, the design and construction of channels in
a state of equilibrium, which do not exhibit excessive erosion or deposition along highly dynamic rivers is currently problematic.
In light of these findings, a conceptual framework based on geomorphic parameters is put forth to assess the likelihood of
project success early in the design process to (1) eliminate high risk sites from consideration of channel reconfiguration
and (2) improve upon the implemented management strategies that are ultimately used. It is also argued that where space permits
an enhanced natural channel, adjustment approach is likely to be more effective than projects based on natural channel design. |
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