Abstract
Abstract Onyx River has three characteristic reaches, bedrock incision, moraine breaches, and alluvial. Antecedent geomorphological events control the slope of these reaches and to some extent the bed material. Coarse bed materials occur in the steep reaches of the bedrock and moraine breach channels. Discharge hydrographs and flow-duration curves reveal a division into two flow regimes with a hiatus at about 1 m3/s. The modern channel form and pattern and distribution of bed materials may be related to these flow regimes. Channel-in-channel features, berms, overspill channels, and longitudinal bars are related to flow characteristics. The evolution of the river and its terraces is discussed in terms of changes in discharge and sediment supply. Prominent terraces are explained in terms of relative contributions of water and sediment from Wright Lower Glacier and from other glaciers. The terraces reflect climatic changes and their chronology is related to recent glacier activity and changes in level of Lak...
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