Glacier de Taconnaz is a hanging glacier in the Mont-Blanc area with an upper accumulation area stretching from Dôme du Goûter (4300 m a.s.l.) down to a wide ice cliff at an altitude of about 3300 m a.s.l., over which flows most of the ice accumulated upstream. During winter, ice blocks breaking off the cliff often trigger off large avalanches constituted of a mixture of snow and ice which can be devastating for the downward inhabited areas in the Chamonix valley as was the case in 1988 and 1999. The approach proposed here is twofold. It first consists of quantifying the flow regime over the accumulation area and consequently the yearly amount of ice falling off the cliff. For this purpose, a network of large stakes was first installed in June 2001 and regularly updated since. From the measured height above surface corrected with time series mass balance of two nearby glaciers, a yearly net mass balance map over the accumulation area has been established and converted into a mean discharge of 1.2 ± 0.3 × 10 6 m 3 year − 1 at the cliff. Moreover, monthly remote topographic surveys of the same stakes provided annual surface velocities, which after some assumptions led to a similar independent amount of discharge. The second part consists of trying to assess the frequency at which the collapses occur from similar monthly topographic measurements of the cliff edge position. Although the time series are still short, a single period of about 180 days seems to control the major ice falls. These data also allow for estimation of ice volumes breaking off which, associated with flow values, could help constraining the frequency of falling events.
Cold Regions Science and Technology – Elsevier
Published: Oct 1, 2006
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera