摘要
定量研究滑坡的空间分布特征对研究滑坡灾害的孕育发展具有重要意义。以陕西省宁强县滑坡为例,采用变维分形方法,探讨滑坡在空间分布上的变维分形特征。结果表明:区域滑坡与不同影响因子,即高程、起伏度、坡度、距河流距离、距断裂带距离和地层岩性之间全部呈一阶累积和变维分形分布特征,且分形维数分别是0.511 1、1.135 7、1.290 6、0.903 8、1.189 5、0.979 9。由此可见滑坡对于不同影响因子的敏感度由高到低分别是坡度>距断裂带距离>起伏度>地层岩性>距河流距离>高程。上述研究表明用变维分形理论来研究滑坡的空间分布特征是完全可行的,它能够定量地反映滑坡的空间分布与各影响因素之间的敏感性关系,特别是对于GIS空间叠加分析时权重的确定有着重要的意义。
Quantitative research on characteristics of spatial distribution of landslide is important for analysis of inoculation and development of landslide. Because the fractal can reveal the fine structure hidden in the com- plex and chaotic phenomena, and it is gradually applied to the study of landslide. Taking the landslide of Ningqiang, Shaanxi as an example, this research discussed the fractal structure characteristics of single-land- slide and large-area landslide systems, and the calculation of fractal dimension and variable fractal dimension. The results show that the relationship between the landslide and the influence factor, i.e. elevation, landform amplitude, slope, distances from fiver and fault, and lithology fits the first-order accumulated variable dimen- sion fractal distribution, and the fractal dimension is 0. 511,1, 1. 135,7, 1. 290,6, 0. 903,8, 1. 189,5 and 0. 979,9, respectively. Thus the sensitivity of these influence factors to landslide is in the descending order as slope 〉 distance from fault 〉 landform amplitude 〉 lithology 〉 distance from river 〉 elevation. This research in- dicates that the variable dimension fractal theory is completely feasible to study the spatial distribution charac- teristics of landslide, and it can quantitatively reflect the spatial distribution of landslide and the sensitivity of the influence factor to landslide; it is especially important for the GIS spatial overlay analysis to determine the weight.
出处
《现代地质》
CAS
CSCD
北大核心
2014年第2期443-448,共6页
Geoscience
基金
西北大学科学研究基金项目(12NW32)
西北大学科研启动基金项目(PR12076)
陕西省社会科学界2012年度重大理论与现实问题研究项目(2012Z029)
关键词
滑坡
变维分形
空间分布
陕西宁强
landslide
variable fractal
spatial distribution
Ningqiang,Shaanxi
