Debris transport in a temperate valley glacier: Haut Glacier d'Arolla, Valais, Switzerland

This paper considers the role of structural glaciology in debris entrainment, transport and deposition at Haut Glacier d'Arolla, a temperate valley glacier in Valais, Switzerland. Sedimentological descriptions and clast analysis have been used to identify relationships between ice structure and debris transport. Relationships identified are (1) debris associated with crevasse traces, (2) the folding of rockfall material incorporated within primary stratification to form medial moraines and (3) dirt cones and englacial debris layers associated with reactivated crevasse traces. A conceptual model is introduced to summarize the manner in which ice structures at Haut Glacier d'Arolla control entrainment and deposition of debris.