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Episodic sediment supply, past glaciation, and slow responses to disturbance make small mountain streams transitional alluvial regimes in which nonequilibrium conditions are common. Bed load effective discharge in these streams is on average a low-magnitude, high-frequency event, but is highly variable. Using a two-phase sediment transport model and long-term discharge records, we distinguish between three types of streams; streams in which gravel (sediment > 8 mm diameter) moves frequently and effective discharge occurs during gravel transport (Frequently Mobile Gravel (FMG)), streams in which gravel moves infrequently but effective discharge nonetheless occurs during gravel transport (Infrequently Mobile Gravel (IMG)), and streams in which sand (sediment |
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