Monitoring Surface Deformation in Xi’an City from 2019 to 2022 Based on Sentinel-1A Data
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摘要:
西安是中国地面沉降和地裂缝等地质灾害集中发育的地区之一。西安市的地面沉降与地下水超采密切相关。近年来，西安市持续开展的地下水人工回灌，地下水位有所恢复。笔者采用小基线集干涉测量InSAR技术对西安城区 2019 年1月至2022年8月期间的 47景升轨 Sentinel-1A 数据进行处理， 获取了西安地区最新的地面形变特征。研究发现，随着地下水位回升，西安市目前地面沉降已经有效缓解，典型沉降区鱼化寨、电子城等已经出现了地面回弹现象，大范围的地面沉降几乎不可见，仅在城区东南处见零星分布的沉降区。地下水位变化是导致地表回弹的重要原因。无论是电子城区域还是鱼化寨区域，其地表抬升形变已经度过土层快速变形的弹性形变时期。总体回弹量在安全范围，对周边的地铁及建筑的影响有限。
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关键词:
- 西安 /
- 地面回弹 /
- 地下水 /
- 地面沉降 /
- 小基线集干涉测量InSAR技术
Abstract:Xi’an is one of the areas in China where geological hazards such as ground subsidence and ground fissures are concentrated and developed. Ground subsidence in Xi’an is closely related to groundwater over–extraction. In recent years, groundwater levels have recovered as a result of the ongoing artificial recharge of groundwater in Xi’an. In this paper, 47 scenes of Sentinel-1A data from January 2019 to August 2022 in the urban area of Xi’an were processed using the small baseline subset InSAR technique to obtain the latest ground deformation characteristics of the Xi’an area. The main results obtained in this paper are as follows: with the groundwater level starting to rebound, ground subsidence in Xi’an has now been effectively alleviated, and ground rebound has been observed in typical subsidence areas such as Yuyuanzhai and Electronic City, etc. Extensive ground subsidence is hardly visible, and only scattered subsidence areas are seen in the southeast of the urban area. Changes in the groundwater table are an important cause of ground rebound. The surface uplift deformation in both the Electronic City area and the Yuhuazhai area has already passed the elastic deformation period of rapid soil deformation. The overall amount of rebound is within the safe range and the impact on the surrounding metro and buildings is limited.
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Key words:
- Xi’an /
- rebound deformation /
- groundwater /
- land subsidence /
- small baseline subsets InSAR technique
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