THREE ALPINE CLIMBS in 1949. R. C. Evans
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IFP 1707 Dent Blanche – Matterhorn – Monte Rosa
Inventaire fédéral des paysages, sites et monuments naturels d'importance nationale IFP IFP 1707 Dent Blanche – Matterhorn – Monte Rosa Canton Communes Surface Valais Evolène, Zermatt 26 951 ha Le Gornergletscher et le Grenzgletscher IFP 1707 Dent Blanche – Matterhorn – Monte Rosa Stellisee Hameau de Zmutt Dent Blanche avec glacier de Ferpècle 1 IFP 1707 Dent Blanche – Matterhorn – Monte Rosa 1 Justification de l’importance nationale 1.1 Région de haute montagne au caractère naturel et sauvage, avec nombreux sommets de plus de 4000 m d’altitude 1.2 Mont Rose, massif alpin avec le plus haut sommet de Suisse 1.3 Mont Cervin, montagne emblématique à forme pyramidale 1.4 Plusieurs glaciers de grande étendue avec marges proglaciaires intactes, en particulier le Gornergletscher, l’un des plus grands systèmes glaciaires de Suisse 1.5 Marmites glaciaires, roches polies et stries glaciaires, structures représentatives des diverses formes glaciaires 1.6 Situation tectonique unique dans les Alpes suisses, superposant des unités tectoniques et des roches de provenances paléogéographiques très variées 1.7 Vastes forêts naturelles de mélèzes et d’aroles 1.8 Phénomènes glaciaires et stades morainiques remarquables et diversifiés 1.9 Zones riches en cours d’eau et lacs d’altitude 1.10 Grande richesse floristique et faunistique, comprenant de nombreuses espèces rares et endémiques 1.11 Zmutt, hameau avec des bâtiments traditionnels bien conservés 2 Description 2.1 Caractère du paysage Le site Dent Blanche-Matterhorn-Monte Rosa est une zone de haute montagne encadrée de massifs montagneux imposants dans la partie méridionale du Valais et à la frontière avec l’Italie. -
Recent Debris Flow Occurrences Associated with Glaciers in the Alps ⁎ Marta Chiarle A, , Sara Iannotti A, Giovanni Mortara A, Philip Deline B
Global and Planetary Change 56 (2007) 123–136 www.elsevier.com/locate/gloplacha Recent debris flow occurrences associated with glaciers in the Alps ⁎ Marta Chiarle a, , Sara Iannotti a, Giovanni Mortara a, Philip Deline b a CNR‐IRPI, Strada delle Cacce, 73–10135 Torino, Italy b Laboratoire EDYTEM, CNRS‐Université de Savoie, 73376 Le Bouget‐du‐Lac, France Received 12 August 2005; accepted 21 July 2006 Available online 9 January 2007 Abstract Debris flows from glacier forefields, triggered by heavy rain or glacial outbursts, or damming of streams by ice avalanches, pose hazards in Alpine valleys (e.g. the south side of Mount Blanc). Glacier‐related debris flows are, in part, a consequence of general glacier retreat and the corresponding exposure of large quantities of unconsolidated, unvegetated, and sometimes ice‐cored glacial sediments. This paper documents glacier‐related debris flows at 17 sites in the Italian, French, and Swiss Alps, with a focus on the Italian northwest sector. For each case data are provided which describe the glacier and the instability. Three types of events have been recognized, based on antecedent meteorological conditions. Type 1 (9 documented debris flows) is triggered by intense and prolonged rainfall, causing water saturation of sediments and consequent failure of large sediment volumes (up to 800000 m3). Type 2 (2 debris flows) is triggered by short rainstorms which may destabilize the glacier drainage system, with debris flow volumes up to 100000 m3. Type 3 (6 debris flows) occurs during dry weather by glacial lake outbursts or ground/buried ice melting, with debris flow volumes up to 150000 m3. -
Structural and Hazard Assessment of the Brenva Rockslide Scar (Mont-Blanc Massif, Aosta Valley, Italy)
Geophysical Research Abstracts Vol. 21, EGU2019-10867, 2019 EGU General Assembly 2019 © Author(s) 2019. CC Attribution 4.0 license. Structural and hazard assessment of the Brenva rockslide scar (Mont-Blanc massif, Aosta Valley, Italy) Michel Jaboyedoff (1), Antoine Guerin (1), François Noël (1), Fei Li (1), Marc-Henri Derron (1), Fabrizio Troilo (2), Davide Bertolo (3), and Patrick Patrick Thuegaz (3) (1) University of Lausanne, ISTE-FGSE, ISTE, Lausanne, Switzerland ([email protected]), (2) Fondazione Montagna Sicura, Courmayeur, Aosta Valley, Italy, (3) Struttura attività geologiche, Regione Autonoma Valle d’Aosta, Italy The southeastern side of Mont Blanc is constituted of high granitic peaks affected by different degree of fractur- ing. In the last hundred years, two major ice-rock avalanche events took place on the Brenva Glacier involving volumes of more than 2×106 m3. In September 2016, a volume of 35’000 m3 detached from the previous rock avalanche scar and was deposited on the higher part of the Brenva Glacier. This new event has pushed Aosta Valley Autonomous Region authorities to investigate in more detail the “Sperone della Brenva” rock mass. Between July 2017 and October 2018, three Photogrammetric Points Clouds (PPCs) were generated using structure-from-motion techniques from hundreds of pictures taken during helicopter flights. The structural analysis of PPCs enabled to identify four major fracture sets in the rock avalanche scar. By fitting planes deeply along these fractures, different potentially unstable volumes were calculated and several scenarios were defined. During autumn 2017, deformation of the rock wall was also monitored with a ground-based InSAR system. -
Hiking the Haute Route
Hiking the Haute Route 11 Days Hiking the Haute Route Experience the Haute Route or "High Road" of the Alps on this challenging itinerary designed for serious trekkers. The Haute Route connects Mont Blanc to the Matterhorn on one of the most spectacular hikes in all the Alps, showcasing majestic mountain passes, alpine pastures, glorious glaciers, storybook hamlets, and delightful alpine huts. Embrace the thrill of summiting ten passes in ten days, guided by top professional guides, and enjoy the comfort of warm hospitality at night in a string of charming alpine towns and villages. Details Testimonials Arrive: Geneva, Switzerland "Around every turn, over every pass they view continuously moves from Depart: Geneva or Zermatt, Switzerlandincredible to never to be forgotten. It really made me think of the amazing Duration: 11 Days power of nature." Jeffrey S. Group Size: 4-16 Guests Minimum Age: 18 Years Old "The sense of accomplishment that came with this trip was matched by the Activity Level: Level 4 vistas, the trails, and the scope of the . experience." Owen W. REASON #01 REASON #02 REASON #03 No one knows the Alps like Professional MT Sobek guides Custom-designed for MT MT Sobek, with four decades are the best in the Alps, all well Sobek, our Haute Route trek of experience leading trips reputed for their indispensable combines strenuous all-day here and a regular following knowledge and skillsets. treks, with carefully chosen, of Alps-loving clients. comfortable lodgings in gorgeous alpine settings. ACTIVITIES LODGING CLIMATE High-altitude hikes, challenging Charming, first-class The days can change from hot summits that involve steep trails, accommodations in alpine to cold and wet. -
The African Mattherhorn : Yes Or No? : a Structural, Geodynamical and Paleogeographical Overview
The African Mattherhorn : yes or no? : A structural, geodynamical and paleogeographical overview Autor(en): Marthaler, Michel Objekttyp: Article Zeitschrift: Bulletin für angewandte Geologie Band (Jahr): 13 (2008) Heft 2 PDF erstellt am: 25.09.2021 Persistenter Link: http://doi.org/10.5169/seals-226680 Nutzungsbedingungen Die ETH-Bibliothek ist Anbieterin der digitalisierten Zeitschriften. Sie besitzt keine Urheberrechte an den Inhalten der Zeitschriften. Die Rechte liegen in der Regel bei den Herausgebern. Die auf der Plattform e-periodica veröffentlichten Dokumente stehen für nicht-kommerzielle Zwecke in Lehre und Forschung sowie für die private Nutzung frei zur Verfügung. Einzelne Dateien oder Ausdrucke aus diesem Angebot können zusammen mit diesen Nutzungsbedingungen und den korrekten Herkunftsbezeichnungen weitergegeben werden. Das Veröffentlichen von Bildern in Print- und Online-Publikationen ist nur mit vorheriger Genehmigung der Rechteinhaber erlaubt. Die systematische Speicherung von Teilen des elektronischen Angebots auf anderen Servern bedarf ebenfalls des schriftlichen Einverständnisses der Rechteinhaber. Haftungsausschluss Alle Angaben erfolgen ohne Gewähr für Vollständigkeit oder Richtigkeit. Es wird keine Haftung übernommen für Schäden durch die Verwendung von Informationen aus diesem Online-Angebot oder durch das Fehlen von Informationen. Dies gilt auch für Inhalte Dritter, die über dieses Angebot zugänglich sind. Ein Dienst der ETH-Bibliothek ETH Zürich, Rämistrasse 101, 8092 Zürich, Schweiz, www.library.ethz.ch http://www.e-periodica.ch Bull. angew. Geol. Vol. 13/2,2008 S. 11-16 The African Matterhorn: yes or no? – a structural, geodynamical and paleogeographical overview Michel Marthaler1 Summary of a presentation given at the VSP/ASP annual convention, Sion, Switzerland, June 2008. The geological landscape in the Zermatt than a klippe the Dent Blanche nappe), a Region shows that the pyramid of the small remnant of the Lower Austro-Alpine Matterhorn appears as a small continental raft unit, from Apulian or Adiatic) origin. -
DIE VIELEN GESICHTER DER DENT D’HÉRENS Hochgebirge Wagten
ALPINE GESCHICHTE, KULTUR, ERZÄHLUNGEN T E X T /F O T OS Françoise Funk-Salamì, Zürich (ü) Walliser Landschreiber Antoni Lambien das «Weisszeh- horn»1 auf seiner Karte. Dieser Name wandelte sich später rreicht man über die Serpentinen ob Sitten das Dorf in «Wyss Zehen Horn», «Zehen Horn» und «Weiszeh- Vex am Eingang des Val d’Hérens, erscheint weit in horn»2 und ab 1820 ins französische «Dent Blanche». Der E der Ferne die unverwechselbare Kulisse der Dent Name Dent d’Hérens hingegen ist in kartografi schen d’Hérens, 4171 m. Taleinwärts gehend, verschwindet sie Zeugnissen noch relativ jung. aber schon bald wieder. Und wer sich von der dominan- Doch welcher Berg war mit «Weisszehhorn» gemeint? ten Dent Blanche in Bann ziehen lässt, wird sie in Evolène Auf alten Karten3 ist das Weisszahnhorn im Alpenhaupt- kaum mehr beachten. Trotzdem tragen sie und das Tal kamm westlich vom Matterhorn, etwa an der Stelle der den gleichen Namen. Was nicht immer so war, wurde die heutigen Dent d’Hérens, eingezeichnet. Galt also der Dent d’Hérens doch auch als Dent Blanche bezeichnet. Name ursprünglich ihr? Für den Engländer Coolidge be- Dies entspräche eher den Gegebenheiten, denn die Dent stand kein Zweifel, dass das Weisszahnhorn auf diesen Blanche, die mächtige Felspyramide über Les Haudères, Karten falsch kartiert worden war und dass damit die vom ist alles andere als weiss. Im Gegensatz zur Dent d’Hérens, Tal aus dominant und näher gelegene, heutige Dent Blan- dem mächtigen vergletscherten Zahn im Talkessel von che gemeint war. Zmutt, dessen Anblick fast in die Gebirgswelt des Pamir Dies lässt sich nachvollziehen, wenn man weiss, dass versetzt. -
Modelling Rock Wall Permafrost Degradation in the Mont Blanc Massif from the LIA to the End of the 21St Century
The Cryosphere Discuss., doi:10.5194/tc-2016-132, 2016 Manuscript under review for journal The Cryosphere Published: 7 July 2016 c Author(s) 2016. CC-BY 3.0 License. Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century Florence Magnin1, Jean-Yves Josnin1, Ludovic Ravanel1, Julien Pergaud2, Benjamin Pohl 2, Philip Deline1 1 EDYTEM Lab, Université Savoie Mont Blanc, CNRS, 73376 Le Bourget du Lac, France 2 5 Centre de Recherches de Climatologie, Biogéosciences, Université de Bourgogne Franche-Comté, CNRS, Dijon, France Correspondence to: Florence Magnin ([email protected]) 10 Abstract. High alpine rock wall permafrost is extremely sensitive to climate change. Its degradation can trigger rock falls constituting an increasing threat to socio-economical activities of highly frequented areas. Understanding of permafrost evolution is therefore crucial. This study investigates the long-term evolution of permafrost in three vertical cross-sections of rock wall sites between 3160 and 4300 m a.s.l. in the Mont Blanc massif, since LIA steady-state conditions to 2100. Simulations are forced with air temperature time series, including two contrasted air temperature scenarios for the 21st 15 century representing possible lower and upper boundaries of future climate change according to the most recent models and climate change scenarios. The model outputs for the current period (2010-2015) are evaluated against borehole temperature measurements and an electrical resistivity transect: permafrost conditions are remarkably well represented. Along the past two decades, permafrost has disappeared into the S-exposed faces up to 3300 m a.s.l., and possibly higher. -
Impacts of the 2003 and 2015 Summer Heatwaves on Permafrost-Affected Rock-Walls in the Mont Blanc Massif
Science of the Total Environment 609 (2017) 132–143 Contents lists available at ScienceDirect Science of the Total Environment journal homepage: www.elsevier.com/locate/scitotenv Impacts of the 2003 and 2015 summer heatwaves on permafrost-affected rock-walls in the Mont Blanc massif L. Ravanel a,⁎,F.Magnina,b, P. Deline a a EDYTEM Lab, University Savoie Mont Blanc — CNRS, 73376 Le Bourget-du-Lac, France b Department of Geosciences, University of Oslo, 0316 Oslo, Norway HIGHLIGHTS GRAPHICAL ABSTRACT • Exceptionally large numbers of rockfalls reported in the Alps in 2003 and 2015, years characterized by a summer heatwave. • The frequency of rockfalls in summer 2015 was comparable to the one of summer 2003 in the Mont Blanc massif. • Rockfalls occurred in permafrost- affected areas, generally at a shallow depth. article info abstract Article history: Rockfall is one of the main geomorphological processes that affects the evolution and stability of rock-walls. At Received 26 December 2016 high elevations, rockfall is largely climate-driven, very probably because of the warming of rock-wall permafrost. Received in revised form 6 July 2017 So with the ongoing global warming that drives the degradation of permafrost, the related hazards for people and Accepted 7 July 2017 infrastructure could continue to increase. Available online 20 July 2017 The heatwave of summer 2015, which affected Western Europe from the end of June to August, had a serious im- Editor: D. Barcelo pact on the stability of high-altitude rock-walls, including those in the Mont Blanc massif. A network of observers allowed us to survey the frequency and intensity of rock-wall morphodynamics in 2015, and to verify its relation- Keywords: ship with permafrost. -
Haute Route Von Zinal INMITTEN EINES MAJESTÄTI TEXT/FOTOS Mario Colonel, Servoz (F)
TOURENTIPP Der Aufstieg zur Cabane d’Arpittettaz bietet eine wunderbare Sicht auf das Zinalrothorn. Die Haute Route von Zinal INMITTEN EINES MAJESTÄTI TEXT/FOTOS Mario Colonel, Servoz (F) as Zinaltal – oder Val d’Anniviers – im Wallis ist ein wahres Bijou im Herzen der Alpen.Manche D halten es für eine der schönsten Gegenden in den Alpen überhaupt.Ein Kranz von Gipfeln mit Höhen über 4000 m bildet ein Amphitheater von wahrhaft majestäti- schen Dimensionen:Dent Blanche,Grand Cornier,Col Durand als Südgrenze,Obergabelhorn,Zinalrothorn und Bishorn schliessen den Kreis im Norden ab.Dazu olonel C kommen pittoreske Dörfer wie Grimentz,in denen die io r Ma : s Chalets aus Tannenholz mit ihren Balkonen und steilen o t o F Dächern schon seit Jahrhunderten die Hänge des Tals zu imitieren scheinen.Und dies am Fuss von Bergen,deren Grate und Zacken atemberaubende Formen bilden.Ski- touren in diesem Gebiet stellen eine Herausforderung dar,der nur gut trainierte und ausgerüstete Skitourenfah- rer gewachsen sind. Eine alpine Skitour Frühling im Winter durch ein selten begangenes Gebiet. Aufstieg zum Glacier Es war Ende April. Der Winter war harmlos gewesen,und de Moming es hatte wenig geschneit.Wir hatten uns für eine schöne Route entschieden:von der Cabane de Tracuit via Bishorn in die Cabane d’Arpittettaz,weiter zur Zinalrothorn- schulter und hinunter zur Cabane du Mountet und even- tuell noch in den Col Durand. Der Aufstieg zur Cabane de Tracuit erwies sich als ziemlich abenteuerlich. Es war geradezu heiss und drückend,der Schnee schwer und anspruchsvoll. Glücklicherweise herrschte nur ge- ringe Lawinengefahr,weil nur wenig Schnee lag. -
Grandes Jorasses, Pointe Croz
After suffering the acrimony of the climbing 97 [ GRANDES JORASSES, community, this way of climbing, as old as alpin- ism, has rapidly become widespread and is now an integral part of the mountaineer’s arsenal. Isn’t POINTE CROZ [4110m] it more comfortable to have one’s hands in warm LESCHAUX BASIN gloves round the handles of ice axes than to crimp on the edge of a snowy crack in -5° temperatures? Just like training on sports crags, practicing dry No Siesta tooling on bolted cliffs allows climbers to quickly become at home with these techniques. In recent years, the number of dry-tooling crags has increased greatly and, thanks to the ‘reasonableness’ of new Difficulty: VI 5 M7 A1 ‘No Siesta: just the name worries a lot of alpinists. The north face and the first people to repeat the routers, there have never been any conflicts with Vertical height: 1000m route, François Marsigny and Olivier Larios in September 1997, have forged for it a solid reputation. ‘bare-hand’ climbers. Like many alpinists, I came to Time: 3 hrs 30 min for the approach/2 to 3 days for the Statistically, the greatest chances of success are for an assault at the beginning of autumn: quite long mountaineering from rock climbing. I have retained route/5 hrs for the descent days, potentially clement temperatures, snow that sticks on the first 20 and final few metres… if the a deep respect for the rock, and obviously I wouldn’t Gear: 2 sets of Aliens, 2 sets of Camalots up to blue 3, wires, preceding months have been rainy. -
Modelling Rock Wall Permafrost Degradation in the Mont Blanc Massif from the LIA to the End of the 21St Century
The Cryosphere, 11, 1813–1834, 2017 https://doi.org/10.5194/tc-11-1813-2017 © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century Florence Magnin1, Jean-Yves Josnin1, Ludovic Ravanel1, Julien Pergaud2, Benjamin Pohl2, and Philip Deline1 1EDYTEM Lab, Université Savoie Mont Blanc, CNRS, 73376 Le Bourget du Lac, France 2Centre de Recherches de Climatologie, Biogéosciences, Université de Bourgogne Franche-Comté, CNRS, Dijon, France Correspondence to: Florence Magnin (fl[email protected]) Received: 31 May 2016 – Discussion started: 7 July 2016 Revised: 19 May 2017 – Accepted: 20 June 2017 – Published: 4 August 2017 Abstract. High alpine rock wall permafrost is extremely sen- are site specific and extrapolation to other sites is limited by sitive to climate change. Its degradation has a strong impact the imbrication of local topographical and transient effects. on landscape evolution and can trigger rockfalls constituting an increasing threat to socio-economical activities of highly frequented areas; quantitative understanding of permafrost evolution is crucial for such communities. This study investi- 1 Introduction gates the long-term evolution of permafrost in three vertical cross sections of rock wall sites between 3160 and 4300 m The IPCC Fifth Assessment Report (AR5) has drawn a above sea level in the Mont Blanc massif, from the Little Ice global increase in permafrost temperature -
Brenva Glacier, Mont Blanc Massif, Italy) Using Indirect Sources: Methods, Results and Validation ⁎ Carlo D'agata A, , Antonio Zanutta B
Global and Planetary Change 56 (2007) 57–68 www.elsevier.com/locate/gloplacha Reconstruction of the recent changes of a debris-covered glacier (Brenva Glacier, Mont Blanc Massif, Italy) using indirect sources: Methods, results and validation ⁎ Carlo D'Agata a, , Antonio Zanutta b a “Ardito Desio” Earth Science Department, University of Milan, Via Mangiagalli, 34, 20133 Milan, Italy b DISTART, Faculty of Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy Received 21 September 2005; accepted 21 July 2006 Available online 5 October 2006 Abstract A quantitative analysis was performed with the aim of identifying changes in the volume and thickness of the Brenva Glacier tongue (Mont Blanc Massif, Italy) in the second half of the 20th century. This analysis was based on the comparison of digital elevation models (DEMs) derived from historical records, specifically maps (1959, 1971, 1983, 2003) and photogrammetric surveys (1991, 1997). The DEMs were generated by means of a digital photogrammetric workstation, with semi-automatic and automatic procedures. Problems relating to the identification of the control points in the photos had to be resolved in order to define the external orientation. An unconventional photogrammetric methodology, based on the identification of homologous points in zones considered outside of the glacier area, was adopted to insert the surveys into a single reference system. Furthermore, along with the photogrammetric data, DEMs derived from digitized historical maps were generated and compared to define changes in the geometry of the glacier tongue. The results indicated a positive long-term glacier tongue balance. In fact, between 1959 and 2003, there was an increase of 22.6×106 m3, equal to an average thickness of ca.+34 m (+0.7 m a−1 w.e.).