Abstract

The construction of paraglacial alluvial fans commenced during deglaciation and was dependent upon the temporary abundance of glacially formed debris. Correlation and regression analyses for five groups of fans located within the Interior valleys of south-central British Columbia, indicate that fan gradient is significantly related to the relative relief, area, height, and slope of associated basins. These factors exerted an influence upon fan geometry through processes of stream and mud-flow deposition.Paraglacial fans are distinguished from fans of arid regions by their steeper gradients and a weaker statistical relationship of fan gradient with basin parameters which is subject to greater variation between local regions. This is attributed to the plentiful supply of glacial drift and local changes in its character. Since the basins of most paraglacial fans were formed preglacially, whereas arid region fans and associated basins were formed concurrently, a weaker control of basin character upon fan geometry is to be expected for the former.

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