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| Titel |
HIRESSS: a physically based slope stability simulator for HPC applications |
| VerfasserIn |
G. Rossi, F. Catani, L. Leoni, S. Segoni, V. Tofani |
| 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 ; 13, no. 1 ; Nr. 13, no. 1 (2013-01-25), S.151-166 |
| Datensatznummer |
250017539
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| Publikation (Nr.) |
 copernicus.org/nhess-13-151-2013.pdf |
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| Zusammenfassung |
HIRESSS (HIgh REsolution Slope Stability Simulator) is a physically based
distributed slope stability simulator for analyzing shallow landslide
triggering conditions in real time and on large areas using parallel
computational techniques. The physical model proposed is composed of two
parts: hydrological and geotechnical. The hydrological model receives the
rainfall data as dynamical input and provides the pressure head as
perturbation to the geotechnical stability model that computes the factor
of safety (FS) in probabilistic terms. The hydrological model is based on an
analytical solution of an approximated form of the Richards equation under
the wet condition hypothesis and it is introduced as a modeled form of
hydraulic diffusivity to improve the hydrological response. The geotechnical
stability model is based on an infinite slope model that takes into account
the unsaturated soil condition. During the slope stability analysis the
proposed model takes into account the increase in strength and cohesion due
to matric suction in unsaturated soil, where the pressure head is negative.
Moreover, the soil mass variation on partially saturated soil caused by
water infiltration is modeled.
The model is then inserted into a Monte Carlo simulation, to manage the
typical uncertainty in the values of the input geotechnical and hydrological
parameters, which is a common weak point of deterministic models. The Monte
Carlo simulation manages a probability distribution of input parameters
providing results in terms of slope failure probability. The developed
software uses the computational power offered by multicore and
multiprocessor hardware, from modern workstations to supercomputing facilities
(HPC), to achieve the simulation in reasonable runtimes, compatible with
civil protection real time monitoring.
A first test of HIRESSS in three different areas is presented to evaluate
the reliability of the results and the runtime performance on large areas. |
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