Regional hydrological thresholds for landslides and floods in the Tiber River Basin (central Italy) |
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Authors: | P Reichenbach M Cardinali P De Vita F Guzzetti |
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Institution: | (1) CNR - IRPI, via Madonna Alta 126, I-06100 Perugia, Italy, IT |
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Abstract: | The definition of landslide warning thresholds, based on the analysis of hydrological data, is proposed. In the Tiber River
Basin of central Italy historical information on landslides and floods, for the period 1918–1990, was available from a nationwide
bibliographical and archive inventory on geohydrological catastrophes. Hydrological data were obtained from mean daily discharge
records at various gauging stations within the basin. Several hundred hydrological events, broadly defined as a series of
consecutive days having mean daily discharge exceeding a predefined value, were identified. Hydrological parameters obtained
from the discharge records were used to rank the events according to their probability to trigger mass movements or inundations
and to define regional thresholds for the occurrence of landslides and floods. The proposed approach, not lacking limitations,
has conceptual and operational advantages, among which is the possibility of using historical information on geohydrological
catastrophes.
Received: 20 November 1996 · Accepted: 25 June 1997 |
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Keywords: | Landslide Flood Regional warning threshold Hazard assessment |
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