196,290 research outputs found
Pericolosità geomorfologiche e vulnerabilità lungo i sentieri turistici dell’ambiente alpino: proposta metodologica per la loro individuazione e rappresentazione
No full textPericolosità geomorfologiche ed elementi di vulnerabilità lungo alcuni sentieri dell’Alta Valtellina
No full textIncremento del rischio geomorfologico e turismo naturalistico. Il caso del “sentiero glaciologico” della Valle dei forni (Alta Valtellina, SO)
No full textPast surface instability of Miage debris-covered glacier tongue (Mont Blanc Massif, Italy): a decadal-scale tree-ring-based reconstruction
No full textDebris-covered glaciers may host several biological forms that colonize the debris cover, especially if the glacier tongue reaches sufficiently low altitudes (down to about 1700 m a.s.l. at Miage Glacier, Western Italian Alps) thus allowing also tree growth. Supraglacial trees colonizing the debris-covered tongue are strongly influenced in growth and distribution by substrate characteristics and instability. The tree age distribution at Miage Glacier presents a positive gradient towards the glacier terminus, which was found to be related to the decreasing glacier surface velocity. By analysing tree-ring growth anomalies on the glacier and at a control site at the tree line over the 20-year period 1987-2006, it was found that trees growing on the glacier presented the highest percentages of abrupt growth changes (AGCs)>+70% with respect to the four previous years. Considering tree displacement on the glacier surface over the same 20-year period and the recorded AGCs, it was found that the central-lower portion of the southern lobe towards the margins was the most unstable. The temporal analysis of AGC>+40% confirmed a period of higher glacier surface instability, reaching a maximum in the years 1988 (on lobe S) and 1989 (on lobe N), probably related to the passage of a kinematic wave in the glacier tongue. Our analysis suggests that supraglacial trees hold useful information on the glacier tongue dynamics and that both AGC>+70% and AGC>+40% may be used as a proxy for substrate instability in spatio-temporal reconstructions in the Alpine environment
Correction to: Estimating the Potential of Archaeo-historical Data in the Definition of Geomorphosites and Geo-educational Itineraries in the Central Po Plain (N Italy)
No full textThe original version of this article unfortunately contained a mistake. The authors’ family names/first names have been inverted. The correct author names are listed above
Geomorfositi glaciali: il caso del Ghiacciaio del Miage, un debris covered glacier dalle caratteristiche particolari.
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