黄土地震古/老滑坡原始地形恢复方法研究

Restoration method of the original topography of ancient seismic landslides in loess areas

黄土地震古/老滑坡原始地形恢复是开展黄土地震古/老滑坡研究的基础。以宁夏回族自治区固原市西吉县平峰乡三合村潘沟组1号滑坡为例,利用卫星遥感解译和野外调查等技术和方法采集滑坡现今地形资料数据;并基于滑坡滑动前后滑坡体体积相等的原则,以MATLAB软件为平台,利用三维曲面插值技术恢复滑坡的原始地形,恢复后的滑坡原始地形斜坡坡面形态整体呈外凸型,坡度分布范围在12°~15°间;最后,利用黄土地貌单元的坡度分布范围和滑坡稳定性计算论证恢复结果的合理性和可行性。文章研究成果可为缺乏滑动前地形资料的黄土地震古/老滑坡原始地形的恢复提供新方法,对黄土地震古/老滑坡的研究具有重要的理论意义和工程应用价值。

Restoration of the original topography is the basis for the study of ancient seismic landslides in loess areas.The No.1 landslide in the Pangou Group,Sanhe Village,Pingfeng Township(Xiji County,Ningxia Hui Autonomous Region)was taken as an example in this paper.Satellite remote sensing interpretation and field survey were adopted to collect the current topographic data of the landslide.Based on the principle of equal volumes of landslide bodies before and after sliding,MATLAB was used to restore the original topography of the No.1 landslide using 3D surface interpolation technology.The surface shape of the restored landslide's original topography is generally convex,with a slope distribution range of 12°—15°.Finally,the rationality and feasibility of the restoration results were demonstrated by the slope distribution range of the loess geomorphic units and the landslide stability calculation.Results provide a novel approach for the restoration of the original topography of ancient seismic loess landslides that lacks the topography data before sliding,thus providing important theoretical significance and engineering application value for related studies.