From rainfall to slope instability: an automatic GIS procedure for susceptibility analyses over wide areas
The paper proposes an automatic procedure in geographic information system (GIS) for the analysis and prediction of landslides due to rainfall events over wide areas. It runs, for each unit cell, a hydrological balance based on the Curve Number method (USDA-SCS 1985–1986), computing the evolution of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2015-07-01
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| Series: | Geomatics, Natural Hazards & Risk |
| Online Access: | http://dx.doi.org/10.1080/19475705.2013.877087 |
| Summary: | The paper proposes an automatic procedure in geographic information system (GIS) for the analysis and prediction of landslides due to rainfall events over wide areas. It runs, for each unit cell, a hydrological balance based on the Curve Number method (USDA-SCS 1985–1986), computing the evolution of groundwater as a result of precipitation and then checks the overcoming, or not, of limit equilibrium conditions of the land in the domain of interest. The mathematical model was implemented in the free and open source GIS GRASS. For any sequence of consecutive days of rain, according to the conditions of soil moisture prior to the time history under study, the hydro-geotechnical model allows (1) the determination of the oscillations of the phreatic table, (2) the part of saturated soil and (3) the slope stability analysis, by taking into proper account the pore pressures buildup. The results of this procedure are returned in raster format, allowing an easy and intuitive interpretation of the land mass sensitivity to meteoric actions. The suggested procedure was applied on an extensive kinematic phenomenon surrounding the city of Santo Stefano d’Aveto (Liguria, Italy). The realized maps of landslide susceptibility are in excellent agreement with what is evident on site. |
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| ISSN: | 1947-5705 1947-5713 |