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| Titel |
Soil slips and debris flows on terraced slopes |
| VerfasserIn |
G. B. Crosta, P. Negro, P. Frattini |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 3, no. 1/2 ; Nr. 3, no. 1/2, S.31-42 |
| Datensatznummer |
250000662
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| Publikation (Nr.) |
 copernicus.org/nhess-3-31-2003.pdf |
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| Zusammenfassung |
| Terraces cover large
areas along the flanks of many alpine and prealpine valleys. Soil slips
and soil slips-debris flows are recurrent phenomena along terraced slopes.
These landslides cause damages to people, settlements and cultivations.
This study investigates the processes related to the triggering of soil
slip-debris flows in these settings, analysing those occurred in
Valtellina (Central Alps, Italy) on November 2000 after heavy prolonged
rainfalls. 260 landslides have been recognised, mostly along the northern
valley flank. About 200 soil slips and slumps occurred in terraced areas
and a third of them evolved into debris flows. Field work allowed to
recognise the settings at soil slip-debris flow source areas. Landslides
affected up to 2.5 m of glacial, fluvioglacial and anthropically reworked
deposits overlying metamorphic basement. Laboratory and in situ tests
allowed to characterise the geotechnical and hydraulic properties of the
terrains involved in the initial failure. Several stratigraphic and
hydrogeologic factors have been individuated as significant in determining
instabilities on terraced slopes. They are the vertical changes of
physical soil properties, the presence of buried hollows where groundwater
convergence occurs, the rising up of perched groundwater tables, the
overflow and lateral infiltration from superficial drainage network, the
runoff concentration by means of pathways and the insufficient drainage of
retaining walls. |
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