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合成孔径雷达是近20年发展起来的一种空间对地观测技术,目前已被广泛应用于获取地表信息及地表形变。针对黄土滑坡空间尺度小、突发性强的特点,以陕西泾河南塬杏园滑坡为例,研究分析了In SAR进行黄土滑坡的特殊处理措施。自1976年以后,泾阳南塬开始大面积漫灌,地下水位不断上升,滑坡频繁发生。采用高分辨率Terra SAR数据以及小基线集In SAR技术进行了实例分析。结果不仅获得与工程勘察结果一致性强的滑坡空间分布参数,而且还获得了滑坡形变的空间分布和时间发育特征,成功探测出该滑坡的启动时间节点。滑前时间序列不但对滑坡机理分析非常重要,而且对类似滑坡的评估和预警也至关重要。
Synthetic Aperture Radar (SAR) is a kind of space-to-Earth observation technique developed in recent 20 years and has been widely used to obtain surface information and surface deformation. Aiming at the small scale and strong suddenness of loess landslide, this paper takes Apricot landslide in the south of Henan Jinghe as an example to study the special treatment measures of loess landslides in In SAR. Since 1976, a large area of floodplain began to emerge in Jingyang South Plateau, groundwater level was continuously rising and landslides frequently occurred. Case studies were conducted using high resolution Terra SAR data and a small baseline set In SAR technique. The results not only obtained the landslide spatial distribution parameters which are in good agreement with the engineering survey results, but also obtained the spatial distribution and time development characteristics of the landslide deformation, and successfully detected the start time node of the landslide. The slip-ahead time series is not only important for the analysis of landslide mechanism, but also important for the assessment and early warning of similar landslides.