SBAS-InSAR技术的广州市地面沉降监测

Monitoring of ground subsidence in Guangzhou with SBAS-InSAR technology

为了研究广州市地面沉降情况,利用覆盖广州地区的34景Sentinel-1A影像数据,基于永久散射体(PS)特征点的短基线合成孔径雷达干涉测量(SBAS-InSAR)技术进行时序分析,结果表明:研究区总体形态呈稳定状态,研究区域内存在6个沉降区,在监测时间内,研究区沉降速率为-32.1 mm/a~7.3 mm/a,累计沉降量为-92.1 mm。广州市的软土是导致沉降的主要因素,城市的工程建设以及地下水的过度开采为重要原因。

In order to study the ground settlement in Guangzhou,the timing analysis based on small baseline subset(SBAS)-interferometric synthetic aperture radar(InSAR)technology of persistent scatterer(PS)feature points was carried out using the sentinel-1A image data covering 34 scenes Guangzhou,and the results showed that the overall morphology of the study area was stable,there were 6 settlement zones in the study area,and the settlement rate in the study area was-32.1 mm/a-7.3 mm/a during the monitoring time,and the cumulative settlement was-92.1 mm.The soft soil of Guangzhou was the main factor leading to settlement,and the construction of the city's engineering and the over-exploitation of groundwater were important reasons.