| Titre | Hydrological implications of periglacial expansion in the Peyto Glacier catchment, Canadian Rockies |
| Auteur | Hopkinson, C; Demuth, M N; Sitar, M |
| Source | Proceedings of the Remote Sensing and Hydrology 2010 Symposium; 2010 p. 1-4 |
| Année | 2010 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110105 |
| Réunion | Remote Sensing and Hydrology 2010 Symposium; Jackson Hole, Wyoming; US; Septembre 27-30, 2010 |
| Document | livre |
| Lang. | anglais |
| Media | papier |
| Formats | pdf |
| Province | Alberta |
| SNRC | 82N/10 |
| Lat/Long OENS | -117.0000 -116.5000 51.7500 51.5000 |
| Sujets | milieu hydrologique; glaciers; levés glaciaires; télédétection; glaciologie; hydrogéologie; géophysique; géologie des dépôts meubles/géomorphologie |
| Illustrations | location maps; plots |
| |
| Programme | Les sciences de la Terre à l'appui de la caractérisation, à l'échelle nationale, des impacts des changements climatiques sur la masse continentale canadienne, Géosciences de changements
climatiques |
| Résumé | (disponible en anglais seulement)
Multi-temporal photogrammetric and LiDAR-based DEMs collected over the Peyto Glacier (1949, 1966, 1993, 2000, 2010) were analysed to quantify rates of glacial
and periglacial volumetric change. During this time, exposed glacier ice area has reduced by 18% from 14.2 to 11.6 km2, while the actively downwasting lateral moraine area has increased by 70% from 0.53 to 0.90 km2. This opposite trend results in an
exponential increase in the periglacial areal proportion of actively downwasting surfaces. Mean annual volumetric loss from the glacier surface has been 14 × 106 m3, with active moraine downwasting accounting for a further 0.6 × 106 m3 (4.5%).
Moraine volumetric losses from 2000 to 2010 were >6%, with an additional >2% in small hanging glacier and perennial snow patch areas. These results indicate that while Peyto Glacier is undergoing continuous retreat, runoff from periglacial areas
ignored in the mass balance record account for up to 8% of contemporary losses from basin storage. LiDAR data were essential to this analysis, as accurate stratification of glacial and periglacial volumetric changes are not normally feasible using
traditional field and photogrammetric mass balance techniques. |
| GEOSCAN ID | 288871 |
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