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• W2051278154 abstract "Abstract. Knickpoints often form in bedrock rivers in response to base-level lowering. These knickpoints can migrate upstream without dissipating. In the case of alluvial rivers, an impulsive lowering of base level due to, for example, a fault associated with an earthquake or dam removal commonly produces smooth, upstream-progressing degradation; the knickpoint associated with suddenly lowered base level quickly dissipates. Here, however, we use experiments to demonstrate that under conditions of Froude-supercritical flow over an alluvial bed, an instantaneous drop in base level can lead to the formation of upstream-migrating knickpoints that do not dissipate. The base-level fall can generate a single knickpoint, or multiple knickpoints. Multiple knickpoints take the form of cyclic steps, that is, trains of upstream-migrating bedforms, each bounded by a hydraulic jump upstream and downstream. In our experiments, trains of knickpoints were transient, eventually migrating out of the alluvial reach as the bed evolved to a new equilibrium state regulated with lowered base level. Thus the allogenic perturbation of base-level fall can trigger the autogenic generation of multiple knickpoints which are sustained until the alluvial reach recovers a graded state." @default.
• W2051278154 created "2016-06-24" @default.
• W2051278154 creator A5026545794 @default.
• W2051278154 creator A5084512283 @default.
• W2051278154 date "2014-05-05" @default.
• W2051278154 modified "2023-10-03" @default.
• W2051278154 title "Multiple knickpoints in an alluvial river generated by a single instantaneous drop in base level: experimental investigation" @default.
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• W2051278154 doi "https://doi.org/10.5194/esurf-2-271-2014" @default.
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