Abstract
The morphometric characteristics of a basin have a significant effect on landslide occurrence and can provide valuable information related to rainfall-induced shallow landslides. Basin morphometric parameters (e.g. average slope, relief and Melton ratio) can be correlated to landslide triggering factors such as rainfall intensity and duration. In this study, the physically-based model TRIGRS was used to determine rainfall intensity and duration (I-D) thresholds for shallow landslides in 93 small basins in the Colombian Andes. The results show highly variable thresholds, even for basins in the same region that are very close together. Different morphometric parameters were calculated for each basin and their effect on the threshold (power-law curves) characteristics was analysed. The morphometric parameters with greater effect on the threshold position (in the I-D graph) are mainly related to the slope gradient, but other elements (e.g. soil properties and basin area), that are important to consider in a physically-based methodology for defining rainfall thresholds, are also described. This analysis is useful for a better understanding of the factors affecting the threshold variability. It could be significant in the subsequent validation of rainfall thresholds defined using this methodology and its implementation in a landslide early warning system in areas for which landslide inventories are not available.
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