正地貌遥感影像在内蒙古土—商公路地质灾害评估中的应用

Positive landform remote sensing image:An application to the geologic disaster evaluation of Tu-Shang Highway in Inner Mongolia.

传统的遥感影像(负地貌)在目视判读时往往给人造成山脊与沟谷相反的视觉效果,在地质灾害评估应用中很难正确判读滑坡、泥石流、冻土等地质灾害的分布.而正地貌遥感影像是在分析遥感成像机理和视觉习惯的基础上生成的符合视觉习惯的三维遥感影像,能够快速、准确判读不同的地质灾害类型及分布,从而提高了工作的进度与精度.根据正地貌遥感影像在室内分析评估区内地质灾害的可能分布位置,然后进行野外踏勘,确定地质灾害特征与发育状况.结果表明土—商公路发生突发性的滑坡、崩塌、地面塌陷、泥石流等地质灾害的可能性小,但拟建公路部分地段仍有可能发生冻土冻融的灾害.

Traditional remote sensing images always cause contrary confusion for ridges and valleys in visual interpretation,so it is difficult to judge geologic disasters such as landslide,mud-rock flow,frozen earth,etc.Positive landform remote sensing images,based on analyzing the mechanism of remote sensing imaging and vision habits,have the characteristics of fitting visual habit and three dimensions.It can speedily and accurately judge the type and distribution of geologic disasters.First the possible distribution of geologic disasters in the Tu-Shang Highway was analysed based on positive landform remote sensing images in this paper,and then a field investigation was conducted to determine their characteristics and development.It is concluded that the possibility of the occurrence of sudden landslides,avalanches,surface collapses,and mud-rock flows on the Tu-Shang Highway is very small.However,in part of the sections where this highway is planned to construct,the freezing and thawing of frozen soil will occur and cause damages.