兰州地区滑坡风险因素及其与区域构造的关系

滑坡作为一种典型的环境地质灾害，其危害日趋严重。利用地理信息系统及空间分析技术分析了兰州地区滑坡风险的主要影响因素、滑坡风险分布规律及其与地形地貌和地质构造的关系，得到的主要结论为：兰州地区滑坡受地形地貌和地质构造影响较大；滑坡风险分布的集中程度为南部基岩山区和黄土梁区坡度较陡峭区域的滑坡分布较为密集，属于滑坡高风险区，而北部黄土丘陵区坡度平缓区域的滑坡分布比较分散，属于滑坡低风险区；研究区域内滑坡风险相对集中的区域面积较小，而相对分散的区域面积较大；滑坡风险沿市区两山成带状分布，且分布趋势与黄河北岸的北西西向断层、西固北岸的北北西向断层以及黄河以南的北北西向断层方向一致。

Factors of regional landslide risk and correlation between landslide and geology structure in Lanzhou area

Landslide is one of typical environment geological hazards, whose risk becomes more and more serious. This study made the research on several influence factors of landslide hazards in Lanzhou by using GIS and spatial analysis. Through researching the distribution rule of the regional landslides it is discovered and found that hazard of landslide has a high correlation with geology structure and terrain. Landslide distribution centralizes in bedrock of south area and loess girder area where has cragged slope, which belongs to high risk zone, and decentralizes in lo- ess hill of north area where has flat slope, which belongs to low risk zone. Area of comparatively centralized landsil- de risk is smaller than that of comparatively decentralized landsilde risk. Landslide distribution is along the city north-south hill in study area, and whose distribution trend is consistent with directions of NWW fault in northern bank of Yellow River, NNW fault in northern xigu district and NNW fault in southern bank of Yellow River.