Aeolian geomorphology of northeast Graham Island, Haida Gwaii (Queen Charlotte Islands), British Columbia.

摘要

This study investigates the modern aeolian morphodynamics of East Beach, Haida Gwaii, British Columbia. Qualitative assessments show this coast is host to diverse aeolian landforms maintained by strong, year-round winds and an abundant supply of sediment, despite a moist marine climate. Quantitative assessments from three models of sediment drift potential and dune mobility show high annual aeolian activity with a seasonal shift from the fall and winter months to the summer. The morphodynamics of a foredune-trough blowout complex are examined during a two-year period through topographic surveys, cross-shore profiles and a network of surface change pins. Results show the foredune plain accreted by 55 m3 m-width-1 a-1, the shoreline retreated up to 37 m while the foredune remained relatively unchanged. This study provides a detailed geomorphic assessment of a highly sensitive, yet understudied, Canadian coastal dune system.