云南省新平县地质灾害与线性构造的相关性研究

Relationship research between geo-hazard and linear structure in Xinping County of Yunnan Province

新平县因其特殊的地理和地质环境，地质灾害高发。采用ETM753与全色波段融合的空间分辨率为15m的遥感图像作为解译的底图，提取四级线性构造信息，应用地理信息系统构建标准格网对线性构造的频率和密度进行分析，配以方位频率、方位密度和平均方位密度统计，采用盒计维数法获取线性构造分维特征，将地质灾害与线性构造分析统计结果作叠加分析，研究表明：区内的线性构造主要分布在中部和东部频率值为3条，4km^2～8条/4km^2和密度值为3～4km／4km^2的区域，NE-SW和NNW-SSE向的线性构造主要控制不稳定斜坡和滑坡发育，NW-SE向线性构造主要控制泥石流发育，全县的线性构造分维值在中国西南地区偏高为1．760。验证了线性构造与地质灾害的正相关性。

Because of special geographical and geological environment, geo-hazards often occurred in Xinping County. ETM753 bands and panchromatic band were fused to get a remote image with 15m spatial resolution, and it was used as an interpretation images to extract linear structures of four degrees.GIS was applied to construct standard grids to do frequency analysis and density analysis, orientation frequency, orientation density and average orientation density were used to do statistics, fractal box dimension method was used to get fractal dimension feature. Then geo-hazards and linear structure analysis and statistics results were used to do overlay analysis, research shows that high frequency linear structures and density linear structures mainly distribute in the middle and eastern region, the linear structures of NE-SW and NNW-SSE orientation mainly control unstable slopes and landslides, the linear structures of NW-SE orientation mainly control debris-flows, the fractal dimension of Xinping County is 1.760, this number is higher in the southwest of China. This research proves that the linear structures and the geo-hazards have positive correlation relationship.