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Discharge magnitude and frequency as a control on proglacial fluvial sedimentary systems



Discharge magnitude and frequency as a control on proglacial fluvial sedimentary systems



IAHS-AISH Publication 276(Pages 297-303



Recent work on active, inactive and Quaternary proglacial outwash plains or sandur, subjected to contrasting magnitude and frequency regimes has yielded new insights into the controls on sandur evolution. This paper provides a review of recent research on magnitude and frequency in proglacial systems. The primary objective of this paper is to demonstrate that sandur influenced by repeated high magnitude flooding (jokulhlaups) are dominated by large-scale bar systems (jokulhlaup bars), which are unrelated to normal, low magnitude-high frequency flows which occur between floods. Jokulhlaup bars scale to flood-channel widths, and their upper surfaces are topographically higher than, and unaffected by, between-flood flows. Large gravel bars are distinctive from large bars in sandy braided rivers, where the dominant discharge is less than bankfull, and large bars grow by amalgamation of smaller bars.

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