基于 SBAS-InSAR 的合肥市地面沉降监测研究

文章采用短基线集合成孔径雷达干涉测量(small baseline subset interferometric synthetic aperture radar, SBAS-InSAR)技术对 Sentinel-1A 卫星升轨数据进行处理分析, 对合肥市地面形变开展监测研究。结果表明: 合肥市地面形变状态较为平稳, 大部分地区地面年平均形变速率在 $ -4 \sim 4 \, mm/a $ 之间; 年平均形变速率超过 $ 10 \, mm/a $ 的显著沉降区和抬升区各 5 处, 其中高新技术产业开发区附近具有最大沉降形变速率, 形变速率为 $ -24 \, mm/a $, 沉降量为 $ 31 \, mm $; 竹溪站附近具有最大抬升形变速率, 形变速率为 $ 12 \, mm/a $, 抬升量为 $ 20 \, mm $。综合分析表明, 合肥市地面沉降主要受断裂活动控制, 后期受工程建设扰动较大, 而地面抬升区分布主要受工程扰动控制。

In this paper, small baseline subset interferometric synthetic aperture radar (SBAS-InSAR) technology is used to process and analyze the Sentinel-1A ascending orbit data, and the monitoring research on ground deformation in Hefei City is carried out. The results show that the state of ground deformation in Hefei City is relatively stable. The average annual ground deformation rate in most areas is within -4-4 mm/a. There are five significant subsidence areas and five significant uplift areas with an average annual deformation rate exceeding 10 mm/a. Among them, there is the largest subsidence deformation rate near the high-tech industrial development zone, the deformation rate is -24 mm/a, and the subsidence amount is 31 mm; the Zhuxi station has the largest uplift deformation rate, the deformation rate is 12 mm/a, and the amount of uplift is 20 mm. Comprehensive analysis shows that the ground subsidence in Hefei City is mainly controlled by fault activity, and greatly disturbed by engineering construction in the later stage; the distribution of ground uplift area is mainly controlled by engineering disturbance.