数字滑坡技术及其在天台乡滑坡调查中的应用

Digital landslide technology and its application in investigation of Tiantai Town landslide

“数字滑坡”技术,是在我国前期滑坡遥感工作基础上,在现代先进信息技术支持下发展起来的滑坡遥感新技术。利用“数字滑坡技术”和滑坡前后的高分辨率卫星数据对2004年9月5日发生在中国四川省的天台乡滑坡,进行了详细调查。获取了滑坡边界、规模、各部分的滑动方向和滑动距离、运动方式、加载和减载部位及方量等数据。基于滑坡地学原理进行的分析认为义和村斜坡虽具有发生滑坡的岩性、构造及临空面基本条件,但在2004年9月5日滑坡前其总体上为一稳定斜坡,这次滑坡性质为义和村斜坡上的首次大规模滑动,滑坡的滑动方式为牵引式,规模约为2300万方,一年前修筑公路是滑坡潜在的诱发因素;滑坡发生前连续强降雨是直接触发因素。

＂Digital Landslide＂ Technique（DLT） is a new developing technique for landslide remote sensing, based on the earlier work in the early stage and supported by modem information technique. At 14：00 2004439-05, a large scale landslide occurred in Tiantai Town, Sichuan Province, China. By using DLT and satellite data of IKONOS （received before landslide occurring） and QUICK BIRD （received after landslide occurring） the landslide had been investigated in detail. Data of the boundary, size, direction and distance of the displacement of sliding blocts, position and volume of loading and unloading, and so on were obtained. Then, based on the principle of landslide-geoscience the spatial analysis was made. It was considered that although there were basic conditions of lithology, tectonic, and facing space to develop a landslide for Tiantai Town slope, which still had been a stable slope before 2004-09-05 landslide, the 2004-09-05 landslide was the first large scale movement and the slide was regressive; with a volume about 23 million m3. It was deduced that high way constructed on November 2003 was the potential inducing factor and the continuous heavy rain was the direct triggering factor for occurrence of 2004-09-05 landslide.