Mots-clés
Cycle gel-dégel ; Dynamique de versant ; Eboulement ; Haute montagne ; Himalaya ; Insolation ; Montagne ; Neige ; Népal ; Température ; Température de surfaceFreeze-thaw cycle ; High mountain ; Himalaya ; Insolation ; Mountain ; Nepal ; Rockfall ; Slope dynamics ; Snow ; Surface temperature ; TemperatureAlta montaña ; Ciclo hielo-deshielo ; Derrumbe ; Dinámica de vertiente ; Insolación ; Montaña ; Nieve ; Temperatura ; Temperatura de superficieRockfall activity in the Kangchenjunga area, Nepal Himalaya
The Permafrost Young Researchers Network (PYRN). Special issue
Auteur(s) et Affiliation(s)
REGMI, D.
Central Dep. of Geography, Tribhuvan Univ., Kathmandu, Nepal
WATANABE, T.
Graduate School of Environmental Science and Fac. of Environmental Earth Sciences, Hokkaido Univ., Sapporo, Japon
LEWKOWICZ, A.
Univ., Ottawa, Canada
Description :
Rockfall activity and related environmental factors (i.e. bedrock thermal regime and precipitation) were monitored through most of one year at elevations between 4600 m and 6800 m in the Kangchenjunga valley of the Nepal Himalaya to identify rockfall dynamics, estimate rockfall frequency for different aspects, and assess temporal and spatial variations in rockfall activity. Rockfall activity on north-facing slopes is mainly controlled by insolation relating to solar elevation and showed an abrupt increase in the pre-monsoon season. Rockfall activity on east-, west- and south-facing slopes is controlled by the duration and effectiveness of sunshine and accumulation of snow. The north-facing slope has a small diurnal range of rock surface temperatures and exhibits seasonal freeze-thaw, whereas the other aspects show frequent diurnal freeze-thaw. These differences result in seasonal rockfall activity on the north-facing slope and the infrequent release of large debris and year-round rockfall activity on the other aspects.
Type de document :
Article de monographie
Source :
Permafrost and periglacial processes, issn : 1045-6740, 2009, vol. 20, n°. 4, p. 390-398, nombre de pages : 9, Références bibliographiques : 14 ref.
Date :
2009
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)