Understanding rainfall-landslide relationships in man-modified environments: a case-history from Caramanico Terme, Italy |
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Authors: | J Wasowski |
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Institution: | (1) Cnr-Cerist c/o Ist. Geol. Appl. Geotec. Politecnico di Bari, via Orabona 4, I-70125 Bari, Italy Fax: +39 80 556 7944, IT |
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Abstract: | The expansion of Caramanico Terme in this century has led to the urbanization of marginally stable valley slopes, and this
has coincided with the apparent acceleration of landslide processes. Recent landslides on man-modified slopes were caused,
but not necessarily triggered, by heavy precipitation (antecedent moisture was a more critical factor than the amount of storm
rainfall). Because no important landslides on natural slopes in the same period were reported in the Caramanico area, a clear
distinction must be made between natural settings and those modified by man when determining rainfall thresholds for predictive
purposes. In recently urbanized mountainous environments, the thresholds used to assess landslide hazards should not be weighted
too heavily on old historical records of precipitation and associated mass movements. Instead, more weight ought to be given
to the period following the occurrence of any major anthropogenic and natural (e.g. high-magnitude earthquake) modification
of slope setting.
Received: 19 October 1996 · Accepted: 25 June 1997 |
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Keywords: | Rainfall Landslide Man-modified slope Italy |
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