Abstract
A slope unit is commonly used as calculation unit for regional landslide analysis. However, the capacity of the slope unit to reflect the geomorphological features of actual landslides still needs to be verified. This is because such accurate representation is critical to ensure the physical meaning of results from subsequent landslide stability analysis. This paper presents work conducted on landslides and slope extraction in two areas in China: The Jiangjia Gully area (Yunnan Province) and Fengjie County (Chongqing Municipality). Ground-based light detection and ranging (LiDAR) data are combined with field landslide terrace measurements to allow for the comparison of slope unit extraction methods (conventional vs. MIA-HSU) in terms of their ability to reflect the geomorphological features of shallow and deep-seated landslides. The results indicate that slope unit boundaries extracted by the conventional method do not match the geomorphological variations of actual landslides, and the method is therefore deficient in meaningfully extracting slope units for further landslide analysis. By contrast, slope units obtained using the MIA-HSU method accurately reflects the geomorphological features of both shallow and deep-seated landslides, and thus provides clearer geomorphological meaning and more reasonable calculation units for regional landslide assessment and prediction.
Highlights
A slope unit is commonly used as the calculation unit in regional landslide assessment and prediction [1,2,3,4,5]
We investigated the capacity of slope units delineated by the conventional method and the MIA-HSU method to extract the geomorphological features of actual landslides, to provide calculation units that can truly reflect slope geomorphology for regional landslide prediction and assessment
This is critical to ensure that the results of subsequent landslide stability analysis have practical physical meaning, and that the location of impending landslides can be identified accurately based on predictions from slope units
Summary
A slope unit is commonly used as the calculation unit in regional landslide assessment and prediction [1,2,3,4,5]. We investigated the capacity of slope units delineated by the conventional method and the MIA-HSU method to extract the geomorphological features of actual landslides, to provide calculation units that can truly reflect slope geomorphology for regional landslide prediction and assessment. To this end, an area prone to shallow landslides, known as the Jiangjia Gully area in Yunnan Province, China was selected, as well as an area prone to deep-seated landslides, in Fengjie County in the Three Gorges Reservoir area in Chongqing, China. Slope units extracted by the conventional method and the MIA-HSU method are compared with the geomorphological features of actual landslides to validate the methodology
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