台风暴雨诱发滑坡具有突发性,调查难度较大。以台风“利奇马”期间发生的山早滑坡为例,基于滑坡发生前的升轨哨兵一号2017年9月12日至2019年8月9日的24景数据,采用SBAS-InSAR技术分析了该时段滑坡的时序累积变形,并结合气象资料进一步分析了滑坡体地表形变的规律。结果表明,山早滑坡发生前的形变主要划分为滑坡体蠕变阶段、滑坡体前缘变形显著增加并向坡体中部逐渐扩大阶段、滑坡体后缘加速变形阶段3个阶段;滑坡体上InSAR监测点垂直方向的形变速率及累积变形数据显示坡体前缘及中部形变速率和累计变形较小,变形主要集中在滑坡体的后缘,其形变速率和累计沉降最大分别可达40 mm/a和320 mm
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