| Abstrakt: |
Different parts of the Indian state of Himachal Pradesh are prone to the landslide hazards owing to its topographic, tectonic and climatic characteristics. Every year, especially during monsoon season, the state is hit by landslide disasters resulting in various environmental and socio-economic losses. As rainfall is one of the major triggering factors of landslides; determination of thresholds for landslides occurrence is one of the effective methods to provide adequate information about the rainfall conditions which can trigger landslide hazard. In the present study, the rainfall thresholds resulting in landslide events were analysed using a software distribution THRESH. The study area includes landslide hazard prone areas of Lesser Himalayan Region. Six rainfall stations representing the study area were selected for the investigations. Two distinct rainfall thresholds, recent–antecedent and intensity duration, have been taken into consideration for the analysis and comparison of data. Furthermore, the obtained threshold results have been validated by comparing the results with exiting data corresponding to two major landslide events, i.e., Kotrupi and Dhalli, in the study area. The study established that the magnitude of rainfall at selected sites exceeded the threshold values, resulting in the initiation of landslide events. |
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