云南省保山市隆阳区地质灾害空间分布规律及易发性分区与评价

The Spatial Distribution,Prone Zoning and Evaluation of Geologic Hazards in Longyang District,Baoshan City,Yunnan Province

保山市隆阳区地处云南省西部,境内有高黎贡山、怒江、澜沧江等大型山脉和河流,地形起伏大,地层出露比较齐全,地质构造复杂,气候条件多样,人类工程活动影响强烈,这些都为地质灾害提供了很好的成灾条件。通过野外实地排查与核实发现,保山市隆阳区现状地质灾害发育,并且类型齐全。利用GIS与GPS技术将调查结果数字化到1∶10万地形、地质图上,可以看出保山市隆阳区地质灾害空间分布规律总体上呈现出北部、东南部分布较多,中部、西部分布较少的特点。在现状地质灾害调查、研究的基础上,采用"地质灾害综合危险性指数法"对保山市隆阳区进行地质灾害易发性分区,将整个保山市隆阳区划分为4个大区共11个亚区,结合成灾地质规律,对各个分区进行了详细评价,分析地质灾害形成的主要原因和诱发主导因素,并提出了相应的防治对策。

Longyang District, Baoshan City is located in the west of Yunnan Province. There are the Gaoligong Mountain, Nu River, Lancang River and some other mountains and rivers. The terrain is fluctuant, and the outcrop is completed in Longyang District. In this area, the geological structure is complicated. Also, the climate is various, and the activities of human are great. These are the good conditions for the occurrence of geologic hazards in Longyang District, Baoshan City. According to investigations in the field, we found that there are many geoIogie hazards and various types of geologic hazards are found. We digitalized the research results on the relief map and geological map with the scale of 1：100000 by using the technologies of GIS and GPS. So we can find the spatial distribution of geologic hazards in Longyang District, Baoshan City. There are more geo- logic hazards in the north and southeast than in the middle and west. After field investigations, we can carry out prone zoning using the ＂Synthetic Hazards Index Method＂. There are four great prone zones including eleven small prone zones. Finally, we evaluated every zone including the reasons why geologic hazards occur and how we can protect the estate and life by using the geological rules of geologic hazards.