| 闫安,韩劲松,李守庆,赵智嵘,王怀静,刘畅.基于综合危险性指数法的地质灾害易发性评价——以芜湖市为例[J].地质找矿论丛,2025,40(4):558-566 |
| 基于综合危险性指数法的地质灾害易发性评价——以芜湖市为例 |
| Geological Hazard Susceptibility Assessment Based on the Comprehensive Hazard Index Method: A Case Study of Wuhu City |
| 投稿时间：2025-10-20 修订日期：2025-11-23 |
| DOI：10.6053/j.issn.1001-1412.2025.04.013 |
| 中文关键词: 易发性评价 综合危险性指数法 地质灾害 核密度 GIS 芜湖市 |
| 英文关键词:susceptibility assessment comprehensive hazard index method geological hazard kernel density GIS Wuhu City |
| 基金项目:安徽省芜湖市“十四五”地质灾害防治规划专项项目“芜湖市地质灾害防治规划项目”（WH01CG2021FW2189）资助。 |
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| 中文摘要: |
| 为明确芜湖市地质灾害孕育条件、成灾机制及风险等级，支撑该市地质灾害“双控”防治工作，针对该市受自然条件与人类工程活动影响形成的地质灾害隐患展开研究。本次研究采用综合危险性指数法，结合芜湖市地质数据、数字高程模型（DEM）、遥感影像等资料，借助ArcGIS空间分析技术，选取高程、坡度、降雨量、断裂缓冲区、地灾点核密度、工程地质岩组6项指标分级赋值，开展易发性评价。结果显示，芜湖市地质灾害易发性分为四类区域：不易发区4 199 km2 （占69.9 %）、低易发区1 026 km2 （占17.1 %）、中易发区317 km2 （占5.3 %）、高易发区465 km2 （占7.7 %）；高、中易发区主要位于低山丘陵，90 %以上灾害点及孕灾点分布在海拔50 m以上区域，新增地质灾害点及孕灾点多在坡度20°以上区域，灾害时间集中于5-9月汛期。研究表明，芜湖市地质灾害受地形、岩土体、降雨等多种因素影响，易发性分区可为“隐患点+风险区”双控提供指导。 |
| 英文摘要: |
| To elucidate the formation conditions, triggering mechanisms, and risk magnitudes of geological hazards in Wuhu City, and to underpin the city’s dual-control initiatives for geological hazard prevention and mitigation, this study examines the geological hazard risks subject to the combined influence of natural conditions and human engineering activities. The study adopted a comprehensive hazard index method, incorporating geological datasets of Wuhu City, digital elevation models (DEM), and remote sensing imagery. By leveraging ArcGIS spatial analysis technology, six indicators-including elevation, slope gradient, precipitation, fault buffer zones, kernel density of geological hazard points, and engineering geological rock groups-were assigned graded scores for the purpose of conducting geological hazard susceptibility evaluations. The findings reveal that the geological hazard susceptibility of Wuhu City can be classified into four zones: low susceptibility (4,199 km2, accounting for 69.9 %), moderate susceptibility (1,026 km2, accounting for 17.1 %), high susceptibility (317 km2, accounting for 5.3 %), and very high susceptibility (465 km2, accounting for 7.7 %). Notably, high-susceptibility and moderate-susceptibility zones are concentrated in the low mountain and hilly regions of the city. More than 90% of existing geological hazard sites and potential hazard locations are located at elevations exceeding 50 meters, while newly emerged and potential hazard sites are predominantly distributed on slopes with a gradient steeper than 20 degrees. Temporally, geological hazards in the region are concentrated during the flood season, from May to September. The research findings demonstrate that geological hazards in Wuhu City are influenced by multiple factors, namely topography, geotechnical conditions, and precipitation. The geological hazard susceptibility zoning map derived from this study provides a scientific basis for implementing dual-control measures targeting both potential hazard sites and high-risk zones. |
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