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- W18842488 abstract "Researchers have proposed several thresholds to predict the transition from unstable to stable states in incised channels. One of the most frequently applied is the 35Wm -2 threshold of specific stream power. However this threshold has not formally been tested in environments distinct from its origin. An approach integrating GIS and hydrologic relationships was developed to calculate specific stream power and shear stress at over 1000 sites in Fairfax County, Virginia, USA. Analysis indicated that specific stream power did not discriminate between stable and unstable sites, even when the dominant substrate material was incorporated into the analysis. Substrate type provided a greater influence statistically on channel stability than values of specific stream power, but substrate type alone did not discriminate between stable and unstable sites. Although the research methods failed to provide any practical evidence to support the notion of a stability threshold of specific stream power, dominant geomorphic theory predicts that channel stability is controlled by thresholds. The research concluded that within the geographic scope of the studied environments, no stream power thresholds appear to predict the attainment of stability in incised channels when using the adopted research methods. In absence of further refinement of such GIS methods, stream managers and researchers should continue to seek practical stability thresholds using high resolution hydraulic modelling at suitable spatial scales." @default.
- W18842488 created "2016-06-24" @default.
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- W18842488 date "2007-01-01" @default.
- W18842488 modified "2023-09-22" @default.
- W18842488 title "Testing specific stream power thresholds of channel stability with GIS" @default.
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