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Investigation of Rainfall-Induced Landslides at the Hillslopes of Guwahati Region, Assam
Abstract Landslides constitute a major hydrogeological hazard component of the natural disasters that affect most of the hilly regions around the globe. The impact of rainwater infiltration in causing landslides is widely recognized. A landslide study has a two-way approach; local scale (slope stability analysis) and regional scale (landslide susceptibility and hazard assessment). For any of the above-mentioned approach, the determination of infiltration capacity, hydraulic conductivity and characterization of the soil strength behaviour under different wetting and seepage conditions are the first and foremost steps. Hillslopes mostly consist of residual soils in unsaturated condition, thus rendering the conventional soil mechanics approach to be inadequate for the assessment of the stability of such slopes. To assess the potential susceptibility to rainfall-induced landslide, an effective modelling of the changes in water content and matric suction in response to rainfall infiltration is essential. Local scale approach gives a framework to address the slope stability and the effect of the various parameters in detailed manner. To address the uncertainty issues, probabilistic methods are developed. Models based on infinite slope stability model coupled with a hydrological model, within a grid-based GIS framework, is developed to evaluate the stability condition of a region. The simulation results of such models can be used to generate landslide susceptibility and hazards map of a particular region.
Investigation of Rainfall-Induced Landslides at the Hillslopes of Guwahati Region, Assam
Abstract Landslides constitute a major hydrogeological hazard component of the natural disasters that affect most of the hilly regions around the globe. The impact of rainwater infiltration in causing landslides is widely recognized. A landslide study has a two-way approach; local scale (slope stability analysis) and regional scale (landslide susceptibility and hazard assessment). For any of the above-mentioned approach, the determination of infiltration capacity, hydraulic conductivity and characterization of the soil strength behaviour under different wetting and seepage conditions are the first and foremost steps. Hillslopes mostly consist of residual soils in unsaturated condition, thus rendering the conventional soil mechanics approach to be inadequate for the assessment of the stability of such slopes. To assess the potential susceptibility to rainfall-induced landslide, an effective modelling of the changes in water content and matric suction in response to rainfall infiltration is essential. Local scale approach gives a framework to address the slope stability and the effect of the various parameters in detailed manner. To address the uncertainty issues, probabilistic methods are developed. Models based on infinite slope stability model coupled with a hydrological model, within a grid-based GIS framework, is developed to evaluate the stability condition of a region. The simulation results of such models can be used to generate landslide susceptibility and hazards map of a particular region.
Investigation of Rainfall-Induced Landslides at the Hillslopes of Guwahati Region, Assam
Sarma, Chiranjib Prasad (author) / Dey, Arindam (author) / Krishna, A. Murali (author)
2019-08-20
13 pages
Article/Chapter (Book)
Electronic Resource
English
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