Landslide Risk Evaluation in Typical Karst Mountainous Areas: A Case on the Western Hubei Area, China
DOI:
https://doi.org/10.36777/ag2023.2.1.9Keywords:
Landslides, Risk Evaluation, Karst Mountain Area, Information Value MethodAbstract
The challenging geological conditions of hilly and mountainous areas, combined with intensive human engineering activities, contribute to a high frequency of landslides. This problem is particularly pronounced in karst mountainous areas, where complex geological conditions, pronounced karst features, variable stratigraphy, and highly dissected terrain increase landslide susceptibility. Therefore, evaluating landslide risk in representative karst mountainous areas and establishing a robust risk assessment framework are essential for effective disaster prevention and management. In this study, landslide risk in Jianshi County was evaluated at the county scale using the Information Value (IV) method. Eight factors, namely elevation, slope, aspect, distance from roads, distance from rivers, distance from geological structures, vegetation cover, and engineering geological rock group, were selected as the main conditioning factors for assessing landslide susceptibility. Land use and rainfall were subsequently considered as the primary triggering factors for assessing landslide hazard. The results indicate that, in typical karst mountainous areas, zones of high landslide susceptibility and high vulnerability tend to overlap, resulting in a spatial concentration of high-risk areas. The factors selected in this study can serve as representative indicators for landslide risk assessment in similar karst mountainous environments. Moreover, the identified spatial characteristics of landslide risk provide a useful reference for risk assessment in other regions with comparable geological and topographical conditions. These findings can support the development of more targeted landslide risk management, prevention, and mitigation strategies in karst mountainous areas.
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