A model of mudflow propagation downstream from the Grohovo landslide near the city of Rijeka (Croatia)
Mudflows regularly generate significant human and property losses. Analyzing mudflows is important to assess the risks and to delimit vulnerable areas where mitigation measures are required. The smoothed-particle hydrodynamics (SPH) model adopted here considers, in two phases, a granular skeleton wi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-02-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/15/293/2015/nhess-15-293-2015.pdf |
| Summary: | Mudflows regularly generate significant human and property losses. Analyzing
mudflows is important to assess the risks and to delimit vulnerable areas
where mitigation measures are required. The smoothed-particle hydrodynamics
(SPH) model adopted here considers, in two phases, a granular skeleton
with voids filled with either water or mud. The SPH depth-integrated
numerical model (Pastor et al., 2009a) used for the present simulations is a
2-D model capable of predicting the runout distance, flow velocity,
deposition pattern and the final volume of mudflows. It is based on
mathematical and rheological models.
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In this study, the main characteristics of mudflow processes that have
emerged in the past (1908) in the area downstream of the Grohovo landslide
are examined, and the more relevant parameters and attributes describing the
mudflow are presented. Principal equations that form the basis of the SPH
depth-integrated model are reviewed and applied to analyze the Grohovo
landslide and the propagation of the mudflow wave downstream of the
landslide. Based on the SPH method, the runout distance, quantities of the
deposited materials and the velocity of mudflow progression which occurred
in the past at the observed area are analyzed and qualitatively compared to
the recorded consequences of the actual event. Within the SPH simulation, the
Newtonian rheological model in the turbulent flow regime and the Bingham
rheological model were adopted and a comparison was made of the application
of the Egashira and Hungr erosion law. |
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| ISSN: | 1561-8633 1684-9981 |