1,721,206 research outputs found
Study on the frost shattering phenomena of the upper Valle di S. Pellegrino (Dolomites): Field research and laboratory experimentations
No full textThe present paper illustrates a research carried out within the framework of a co-operation programme between the University of Caen (France) and the University of Modena, active in 1985-87 and concerning Geomorphology. The research was made in order io value which factors determined the asymmetrical modelling of the slopes of a Dolomitic valley with an EW orientation (the upper Valle di S. Pellegrino). The study, besides a bibliographical research, involved detailed field observations and laboratory tests; finally field and laboratory data were compared. In particular, the influence of the factors lithology, tectonics and aspect on the evolution of the valley sides was examined. The field observations (detailed gaomorphological survey and observations on fracturation conditions of the rocks of the two slopes) showed, on the one hand, the differential morphology of the valley sides and the asymmetrical distribution of the Quaternary deposits, on the other hand, the constancy of structural conditions (attitude of strata, pattern of fissurations). The bibliographical and field data supplied important indications on the constancy of the factors lithology and tectonics, while, at the same time, emerged the variability of frost shattering, due to the different aspect of the slopes. in the laboratories of the "Centre de Géomorphologie du CNRS" of Caen, determinations of physical and mechanical properties (water content, porosity, capillarity, permeability and microfissuration) of rock samples were carried out; besides experimental frost shattering was done by subjecting the above-mentioned samples to daily freeze-thaw cycles in cold rooms. From these tests data which confirmed the constancy of the factors lithology and tectonics were obtained. Therefore it seems that the asymmetrical modelling of the valley sides has been deeply influenced by the factor aspect: the North-facing slope had been longer protected by glaciers (and by these more intensively shaped) from the effects of freeze-thaw cycles; besides longer lasting snow-coverings occured after the retreat of the glaciers and occur at the present time on the Northfacing slope, where should be ensured a protective action, which is different from the one of the opposite side. On the other hand, it seems that the different exposure when the snow-covering is absent everywhere, originates more remarkable frost shattering phenomena on the South-facing slope, because of a higher frequency of temperature fluctuations around 0°C. A concise bibliographical rewiew concerning frost shattering phenomena and mechanisms is also presented
Landslides in a changing environment: evidence from past activity records in the Dolomites (Italy).
No full textBibliography concerning deepseated gravitational deformations
No full textBibliography concerning Deepseated Gravitational Deformations - II Quaternario, 3(2), 1989, pp. 131-140 - The aim of the present paper is to give information about the researches which have been carried out on deep-seated gravitational deformations all over the world. For his reason a list of publications (written in Italian, English, French and German) regarding the above mentioned phenomena is here presented. The authors show the existence of different scientific schools characterized by different approaches in the study of this subject. Moreover the evolution of theories and ideas with respect to the interpretation of the phenomena is given
Landscape sensitivity to climate changes: the significance of landslide activity records
No full textGeomorphology without borders — The history of the International Association of Geomorphologists (IAG) and reappraisal in the 35th anniversary
No full textThis paper reviews the history of the International Association of Geomorphologists (IAG), an organization formally established in 1989, but with the foundations laid at the First International Conference on Geomorphology in Manchester in 1985. It recreates the spirit of the 1980s, when the need for more efficient international cooperation on an equal basis was argued for, and outlines steps which led to its setting up. The model of operation of the IAG is presented, emphasizing membership by countries, followed by milestone institutional developments, listing of IAG officers and its Honorary Fellows. Key IAG activities are conferences, projects run by working groups, training and support programmes for early career geomorphologists, and publications. A summary of major achievements and challenges for the future concludes the paper
Records of landslide occurrence during the Holocene as environmental proxies: case studies in the Italian Dolomites.
No full textHillslope Processes and Climate Change
No full textThis chapter focuses on the relationships between hillslope processes and climate change, with special attention to the role of climate changes on the temporal and spatial occurrence of mass movements
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