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| Titel |
Hydrological modelling of a slope covered with shallow pyroclastic deposits from field monitoring data |
| VerfasserIn |
R. Greco, L. Comegna, E. Damiano, A. Guida, L. Olivares, L. Picarelli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 10 ; Nr. 17, no. 10 (2013-10-16), S.4001-4013 |
| Datensatznummer |
250085960
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| Publikation (Nr.) |
 copernicus.org/hess-17-4001-2013.pdf |
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| Zusammenfassung |
| A one-dimensional hydrological model of a slope covered with pyroclastic
materials is proposed. The soil cover is constituted by layers of loose
volcanic ashes and pumices, with a total thickness between 1.8 m and 2.5 m,
lying upon a fractured limestone bedrock. The mean inclination of the slope
is around 40°, slightly larger than the friction angle of the
ashes. Thus, the equilibrium of the slope, significantly affected by the
cohesive contribution exerted by soil suction in unsaturated conditions, may
be altered by rainfall infiltration. The model assumes a single homogeneous
soil layer occupying the entire depth of the cover, and takes into account
seasonally variable canopy interception of precipitation and root water
uptake by vegetation, mainly constituted by deciduous chestnut woods with a
dense underbrush growing during late spring and summer. The bottom boundary
condition links water potential at the soil–bedrock interface with the
fluctuations of the water table of the aquifer located in the fractured
limestone, which is conceptually modelled as a linear reservoir. Most of the
model parameters have been assigned according to literature indications or
from experimental data. Soil suction and water content data measured between
1 January 2011 and 20 July 2011 at a monitoring station installed along the
slope allowed the remaining parameters to be identified. The calibrated model,
which reproduced very closely the data of the calibration set, has been
applied to the simulation of the hydrological response of the slope to the
hourly precipitation record of 1999, when a large flow-like landslide was
triggered close to the monitored location. The simulation results show that
the lowest soil suction ever attained occurred just at the time the
landslide was triggered, indicating that the model is capable of predicting
slope failure conditions. |
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