Journal
GEOMORPHOLOGY
Volume 440, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.geomorph.2023.108868
Keywords
Morphologic classification; Gravel-bed river; Pool riffle; Velocity reversal hypothesis; Flow-convergence routing; Bedforms; Continuum concept
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This study analyzes the diversity of pool-riffle morphologies and mobility thresholds, and discusses the influence of flow and sediment regimes on these morphologies.
Pool-riffle sediment and flow dynamics have been studied for many years, but relatively little work has investigated how variations in flow and sediment regimes might lead to a diversity of pool-riffle morphologies. In this letter we analyze a database of quantitative and qualitative measurements from sites where pool-riffle morphologies have been studied and assess the sites relative to morphologic transitions and mobility thresholds. Results show that pool-riffle sites are stretched over a morphologic gradient of predicted bar types from scrolls to chutes and a modelled mobility gradient from threshold to low transport channels. Flow- and sediment-driven phenomenon that are relevant for pool-riffle mechanics are discussed in this context.
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