Abstract: Taking the geological hazards of Wuxi County map in the upper reaches of Daning River and Dachang map in the middle reaches of Daning River as an example, the development characteristics of geological hazards in the upper and middle reaches of Daning River were expounded and the differences between the development of geological hazards in the upper and middle reaches were compared. Meanwhile, their internal causes were also analyzed. The results show that: the geological hazards in Wuxi County are dominated by small-scale collapse, debris flow and landslides, among which the number of landslides is the largest. However, in recent years, the frequency of landslides and debris flows is relatively higher, and the damage caused by them is also more serious. The geological hazards in the map of Dachang are dominated by large and medium-sized landslides, whose harm is the most serious. Due to the differences in stratigraphic lithology, topography, geological structure and river erosion, there are obvious differences in the development characteristics of geological hazards between Wuxi and Dachang.

Key words: environmental engineering, Daning River, geological hazards, Wuxi County map, Dachang map

摘要： 以大宁河上游的巫溪县幅和大宁河中游的大昌幅地质灾害为例，阐明大宁河上游及中游的地质灾害发育特征，并将上游及中游的地质灾害发育差 异进行对比，分析其内在成因。结果表明：巫溪县幅地质灾害以小规模的滑坡、崩塌和泥石流为主，其中以滑坡数量最多，但近年来崩塌和泥石流发生 的频率较高，其造成的危害也较为严重；大昌幅地质灾害以大中型滑坡为主，其造成的危害也最为严重；由于地层岩性、地形地貌、地质构造及河流侵 蚀等方面的不同，巫溪县幅地质灾害与大昌幅地质灾害发育特征存在明显差异。

关键词: 环境工程, 大宁河, 地质灾害, 巫溪县幅, 大昌幅