北京大兴国际机场及周边交通干道形变时序InSAR监测

北京大兴国际机场作为国际航空综合交通枢纽,开展其周边地面形变及主要交通干道的稳定性监测,对保障机场的正常运营至关重要。利用2019～2020年覆盖北京大兴国际机场的42景升轨和35景降轨Sentinel-1影像,采用StaMPS技术对机场周边地面沉降及主要交通干道稳定性进行了监测。结果表明:Sentinel-1升、降轨监测结果具有很好的一致性,90%以上的公共像元形变速率差值的绝对值小于8 mm·年^-1; 机场西部(西胡林村、十里铺村和辛安庄村附近)、机场北部(西里河村和祁各庄村附近)以及机场东北部(河北头村和西白塔村附近)地面沉降状况相对严重,局部地区年均形变速率超过-30 mm·年^-1; 形变时序结果显示在西胡林村、十里铺村和祁各庄村附近,地面累计形变分别达到了58、60和70 mm。通过提取北京大兴国际机场周围主要交通干道形变趋势分析可知,多条主要交通干道均存在不同程度的沉降趋势,存在潜在安全隐患,后续需要重点关注并持续监测。此外,对高架道路高度的反演结果显示,高架道路与周围部分地物在高度上形成鲜明对比,且与实际情况较为相符。

InSAR Monitoring on Deformation Time Series of Beijing Daxing International Airport and Its Surrounding Traffic Arteries,China

Beijing Daxing international airport is a comprehensive transportation hub for international aviation. It is very important to monitor the ground deformation around the airport and the stability of the main traffic arteries. 42 Sentinel-1 ascending orbit images and 35 Sentinel-1 descending orbit images covering the area from 2019 to 2020 were used to monitor the ground subsidence and the stability of main traffic arteries around the airport using StaMPS technology. The results show that the Sentinel-1 monitoring results have good consistency, and the absolute value of deformation rate difference of more than 90% common pixels is less than 8 mm·a^-1; in the west(near Xihulin, Shilipu and Xin'anzhuang), the north(near Xilihe and Qigezhuang)and the northeast(near Hebeitou and Xibaita)of Beijing Daxing international airport, the land subsidence is serious, and the annual average deformation rates in some areas exceed -30 mm·a^-1; the results of deformation time series show that the accumulated surface deformations in Xihulin, Shilipu and Qigezhuang reach 58, 60 and 70 mm, respectively. By analyzing the deformation trend of the main traffic arteries around Beijing Daxing international airport, it can be concluded that there are various degrees of subsidence trend in many main traffic arteries, and there are potential safety hazards, which need to be paid attention to and be monitored continuously. At the same time, the height inversion result of the elevated road shows that the height of the elevated road is in sharp contrast with some surrounding ground objects, and is relatively consistent with the actual situation.