Sen Zhang, Zhenjiang Meng, Chong Xu, Wen Fan, Xin Liang, Fan Zhang, Yufei Song, Chao Li, Xu Zhang
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引用次数: 0
Abstract
Against intensified climate change, landslide risk is rising. The Chinese Loess Plateau, with distinctive lithology, complex terrain and strong human activity, is sensitive to moisture changes and engineering disturbance, making it a typical region for landslide development. However, regional-scale spatial distribution patterns and scale-dependent factor relationships remain insufficiently understood. Taking Baota District, Yan’an as a case study, we selected eight factors and integrated field investigation, UAV verification, landslide number density (LND), landslide area percentage (LAP), frequency ratio (FR), and GeoDetector analysis. Field investigation shows that landslide traces mainly occur in loess ridge-gully terrain, valley-bank slopes and engineering-affected areas, with small shallow failures predominating and large old landslides showing multi-stage deformation. Spatial analysis indicates concentrations at elevations of 1000–1100 m, slopes of 30–40°, 550–600 mm mean annual precipitation, within 1000 m of rivers and roads, in Quaternary units, and in forest and grassland areas. GeoDetector shows marked area-class differences in factor explanatory power for individual landslide-trace area variation: slope is prominent in several classes, whereas stratigraphy, elevation and aspect become more important in others. Representative enhanced interactions include slope–aspect, slope–land use and slope–stratigraphy for smaller traces; elevation–aspect, elevation–slope and slope–aspect for intermediate sizes; and slope–distance to rivers for the largest traces. Overall, these scale-dependent associations occur within a regional setting characterized by steep topography, favorable conditions for water circulation, and frequent human activities. These findings provide a reference for differentiated landslide investigation and prevention in loess hilly-gully regions.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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