甘肃省宕昌县地质灾害发育特征与形成条件分析

宕昌县是甘肃省地质灾害最为发育的县之一。在充分研究区域自然地质环境资料的基础上,以遥感解译结合地面调查为技术手段,采用点、线、面相结合的调查方式,完成了宕昌县地质灾害详细调查工作。调查研究结果表明,宕昌地质灾害主要发育类型为泥石流、滑坡及崩塌,具有黄土、碎石土、基岩地区地质灾害典型特征;从时空分布规律上来看,宕昌县地质灾害具有集中性与区域差异性;形成条件包括地形地貌、地质构造、地层结构、降雨和人类工程活动。

Formation Conditions and Development Characteristics of Geological Hazards in Tanchang County of Gansu Province

In the matter of geological hazards, Tanchang County is in extraordinarily severe situation in Gansu Province. Through the analysis of the data of regional geological environment, a detailed investigation of geological hazards in Tanchang County is completed by means of remote sensing interpretation and field investigation, in the manner of the combination of point, line, and area surveying. Results from the investigation show that mudslides, landslide, and collapse are the main types of geological hazards with the typical characteristics of geological hazards in loess-bedrock region. Landscape, geological structure, stratum structure, rainfall, and human engineering activity should be considered as the main formation conditions of geological hazards.