论文部分内容阅读
针对兰州市1986—2016年间降雨型滑坡灾害的空间分布特征,该文基于ArcGIS,利用核密度估算方法分析滑坡点,通过多次测试比较确定了估算的最优距离阈值,得到概化程度高、数值变化平滑的栅格密度,并结合研究区内高程、坡度以及地质环境揭示了降雨型黄土滑坡灾害的空间分布特征。研究表明:滑坡点沿着黄河及其支流沿岸分布,密集程度有“两高两低”分布特点,高程、坡度与滑坡多发存在相关性,城关区滑坡点最多且呈环状分布,西固区次之,其他区较少。
Aiming at the spatial distribution characteristics of rainfall-type landslide disaster in Lanzhou city from 1986 to 2016, based on ArcGIS, the landslide point is analyzed by using kernel density estimation method, and the optimal distance threshold is determined through comparison of many tests. The grid density of the change of the numerical value is smoothed. The spatial distribution of the rainfall-type loess landslide disaster is revealed by combining the elevation, slope and the geological environment in the study area. The research shows that the landslide is distributed along the banks of the Yellow River and its tributaries, and the intensity is distributed in “two highs and two lows”. The elevation and slope are related to the multiple landslides. Solid area second, less in other areas.