Preprints
https://doi.org/10.5194/egusphere-2024-164
https://doi.org/10.5194/egusphere-2024-164
29 Jan 2024
 | 29 Jan 2024
Status: this preprint is open for discussion.

Geomorphological and geomorphometrical characterization of subglacial channels on Devon Island, Nunavut, Canada

Simona F. Ruso, Anna Grau Galofre, and Gordon R. Osinski

Abstract. Subglacial channels are morphologically and morphometrically distinct in comparison to fluvial channels, yet their identification from remote sensing data is still problematic. To contribute to the current set of criteria used to identify such channels, we performed detailed field observations of two subglacial channel networks on Devon Island, Nunavut, Canada. In planform, these channels are isolated, finger-like networks that drain into a main stem and have distinct cross-sectional and longitudinal profiles. Cross-sections are flat-bottomed with steep walls and longitudinal profiles are convex and exhibit undulations, typical of pressurized water flow (i.e., subglacial flow). To facilitate remote sensing identification, we interrogated how well-known scaling relationships capturing hydraulics and mass balance dynamics of fluvial systems differ in subglacial channels. Scaling relationships typically used to discern connections between discharge and channel and catchment size in fluvial systems were applied to both networks, yielding trends distinct from the fluvial literature. We suggest that the weakly correlated relationship we found between channel discharge and the size of the drainage area indicates a discrete point or line source of water, such as a moulin or crevasse. 

Simona F. Ruso, Anna Grau Galofre, and Gordon R. Osinski

Status: open (until 23 Mar 2024)

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Simona F. Ruso, Anna Grau Galofre, and Gordon R. Osinski
Simona F. Ruso, Anna Grau Galofre, and Gordon R. Osinski

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Short summary
We attempt to enhance the current diagnostic criteria for channels formed under ice sheets by applying mathematical relationships commonly used to describe the correlation between river size and discharge. Our analysis reveals a unique relationship between channel size and drainage area size, which we have interpreted to represent formation under an ice sheet. These relationships can be applied to extremely remote environments to discuss glaciation in locations with accessibility constraints.