Channel Morphology of Unglaciated Confined Channels
(Information Compiled by A. Bryden)
Channels in unglaciated valleys that are confined are considered to be directly connected to hillslope processes. This morphology is characterized by steep-gradient channels confined on both banks by bedrock or the valley wall. Channel confinement by the valley wall exposes the channel to hillslope processes such as debris flows and landslides. Even with sediment supply from the hillslope processes, the steep gradient leads to channel morphologies indicative of a high transport capacity.
The channel morphology of a confined unglaciated valley can vary over short distances. Step-pool morphologies are common, although bedrock, cascade, and even plane-bed sections can also be present.
Unglaciated Confined Channel, Cache La Poudre River
(Photo by E. Wohl)