Thèse de doctorat : Université de Fribourg, 2005 ; Nr. 1480.
Rockfall represents one of the most common geomorphological processes in mountain regions and has extensively been studied in the past. Nonetheless, detailed data on frequencies (how often), volumes (how large), spatial distributions (where) or the seasonality (when) of rockfall activity remain scarce and most of the time fragmentary. Similarly, tree-ring analysis has only exceptionally been used...
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Thèse de doctorat : Université de Fribourg, 2003 ; Nr. 1407.
Im Späten Oxford und frühesten Kimmeridge herrschten im Bereich des heutigen zentralen Schweizer Juras Karbonat-dominierte Ablagerungsbedingungen auf einer flachen Plattform. An der Schwelle zwischen borealen Ablagerungsäumen im Norden und der Tethys im Süden entwickelten sich dynamische Sedimentationssysteme, unter subtropischem und semiaridem bis aridem Klima (Paläobreite von 33° bis 38°...
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In: Proceedings of SPIE, 2004, vol. 5489, p. 102
Selection of an ideal site for the new generation of Overwhelmingly Large (OWL) telescopes is dependent on many climatological and meteorological parameters. Among these are cloud cover, atmospheric humidity, aerosol content, air temperature, airflow direction, strength and turbulence. Even relatively minor changes in weather patterns can have a significant effect on seeing conditions. A...
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This paper describes the collection, checking and homogenisation of a Canadian atmospheric surface pressure database. The object of the exercise was to create a database of monthly mean surface pressure for as many stations as possible across Canada as far back in time as possible. Data sources included the World Weather Records, Monthly Climatic Data for the World Bulletins, the Global...
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In: Meteorological Applications, 2005, vol. 12, p. 77
Astronomical research at present requires that a telescope with an aperture diameter of between 50 and 100 metres be constructed within the next 10 years or so. This new generation of telescopes will be called OWL (Overwhelmingly Large), and it represents one order of magnitude increase in size over today's telescopes. Selection of an ideal site for this giant telescope is dependent on many...
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In: Geomorphology, 2005, vol. 68(3-4), p. 224
For the first time, dendrogeomorphology has been used to investigate spatial and temporal variations of rockfall activity in a protection forest. We report results of 564 cores from 135 severely injured Larix decidua Mill. trees on the west-facing Täschgufer slope, Swiss Alps. While trees sampled reached an age of 297 years on average, the oldest one attained breast height in AD 1318. For...
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In: Mémoires de Géologie (Lausanne), 2004, vol. 42, p. 1-210
The Aiguilles Rouges and Mont Blanc external massifs belong to the pre-Mesozoic basement areas of the external domain of the Alps. Before their involvement into the Alpine building (basement nappes) they registered a multiple geological evolution comprising the deposition of Neoproterozoic to Cambrian sediments and emplacement of granitoid and metabasic to ultramafic magmatic rocks of Early...
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In: Cretaceous Research, 2001, vol. 22 (2), p. 173
The Aptian–Lower Turonian hemipelagic sediments of Roter Sattel in the Swiss Prealps are well dated by planktonic foraminifera. Stacking pattern of the limestone-marl alternations and facies evolution allow the identification of sequence boundaries, transgressive surfaces, and maximum-flooding events or condensed sections on at least two hierarchical levels. Calibrated by a precise...
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In: Sedimentary Geology, 2005, vol. 1-4(3), p. 187
This study describes the coeval development of the depositional environments in three areas across the Mut Basin (Southern Turkey) throughout the Late Burdigalian (early Miocene). Antecedent topography and rapid high-amplitude sea-level change are the main controlling factors on stratigraphic architecture and sediment type. Stratigraphic evidence is observed for two high-amplitude (100–150 m)...
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Thèse de doctorat : Université de Fribourg, 2003 ; no 1417.
Les glissements de terrain profonds (> 10 m) sont généralement caractérisés par des phases d'accélération alternant avec des périodes d'accalmie, mais le plus souvent sans montrer de réelle stabilisation. Il est donc difcile d'étudier l'évolution de l'activité compte tenu de la continuité des mouvements. Pour cela, une méthode d'analyse a été mise en place an de reconnaître...
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