Submitted:
09 March 2026
Posted:
10 March 2026
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Abstract
The Dongchuan District of Kunming City lies in the transition zone between the Yunnan-Guizhou Plateau and the Sichuan Basin, hosting numerous landslides that pose a serious threat to local lives and property. Therefore, compiling a comprehensive landslide inventory and analyzing the relationships between landslide spatial distribution and influencing factors are of significant importance for geological hazard prevention. This study focuses on the Dongchuan District. High-resolution remote sensing imagery was interpreted to establish a landslide inventory, and the spatial distribution and geometric characteristics of landslides were systematically analyzed. The results show that a total of 1,623 landslides were identified, covering an area of 10.36 km². Landslides predominantly occur at elevations of 1,000-2,000 m, on slopes of 20°-45°, with aspects of 255°-285°, relief between 150-400 m, annual rainfall below 825 mm, and within a distances of 1,000 m from rivers and 3,000 m from faults. Four landslide clusters were delineated along the Xiao River Fault, highlight the significant influence of the fault on the spatial distribution of landslides. Most landslides are longitudinal in planform, with travel distances (L) of 50-450 m and heights (H) from 25 to 350 m, exhibiting allometric relationships between these parameters and volume. The mean H/L ratio is 0.56 (corresponding to a mean reach angle of 29°), significantly higher than that observed in Baoshan City (mean reach angle of 21°). The results would be helpful for further understanding landslide initiation mechanisms and spatial distribution patterns on the northern margin of the Yunnan-Guizhou Plateau and providing valuable data support for subsequent landslide hazard risk assessment in this region.
