Abstract
In 2009, Typhoon Morakot caused over 680 deaths and more than 20,000 landslides in Taiwan. From 2010 to 2015, the Central Geological Survey of the Ministry of Economic Affairs identified 1047 potential large-scale landslides in Taiwan, of which 103 may have affected human settlements. This paper presents an analytical procedure that can be applied to assess the possible impact of a landslide collapse on nearby settlements. In this paper, existing technologies, including interpretation of remote sensing images, hydrogeological investigation, and numerical analysis, are integrated to evaluate potential failure scenarios and the landslide scale of a specific case: the Xinzhuang landslide. GeoStudio and RAMMS analysis modes and hazard classification produced the following results: (1) evaluation of the failure mechanisms and the influence zones of large-scale landslides; (2) assessment of the migration and accumulation of the landslide mass after failure; and (3) a landslide hazard and evacuation map. The results of the case study show that this analytical procedure can quantitatively estimate potential threats to human settlements. Furthermore, it can be applied to other villages and used as a reference in disaster prevention and evacuation planning.
Highlights
Slope-land disasters include large-scale landslides, the burial of villages, landslide dams, the destruction of roads and bridges, river scouring and aggradation, and mass transport of woody debris and sediment
For potential large-scale landslides, several factors must to be noted: (a) geological drilling must penetrate into the deepest slip surface or bedrock and should not be less than 30 m; (b) the RIP method can be used for geophysical prospecting, the prospecting line should match the geological drilling position, and the prospecting depth must exceed the depth of the geological drilling; and (c) all hydrogeological units should obtain the physical, mechanical, and hydrological parameters
The purpose of the field investigation is to understand the environmental conditions contributing to slope instability, the extent and volume of the landslide, and the people and infrastructure affected by the landslide hazard
Summary
Slope-land disasters include large-scale landslides, the burial of villages, landslide dams, the destruction of roads and bridges, river scouring and aggradation, and mass transport of woody debris and sediment. The definition of a large-scale landslide often includes factors such as materials, landslide scale (depth, area, or volume), or type of movement [1,2,3,4,5]. In Taiwan, the current agreed-upon definition for a large-scale landslide is a landslide that is larger than 100,000 m3 in volume [5,6,7]. The large volume of material mobilized in a large-scale landslide can trigger accessory phenomena such as debris flows and river damming. Large-scale landslides pose a significant hazard to villages located nearby
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