Time-series InSAR-based monitoring and analysis of surface deformation in the Axi mining area, Xinjiang
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摘要: 新疆阿希矿区地理环境复杂,长期的矿产资源开采致使矿区的地面发生了较为严重的沉降和变形,造成了采矿生产安全隐患和周边生态环境的破坏。为了进一步研究分析阿希矿区地面沉降时空变化特征和地表形变规律。首先,利用小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2017年2月9日—2021年4月25日获取的127景升轨Sentinel-1A影像数据进行沉降计算; 其次,将InSAR沉降监测结果与水准测量结果进行对比验证; 最后,分析了阿希矿区近5 a地面沉降时空变化特征,并研究了影响矿区地面沉降的驱动因素。结果表明,在整个监测期间内,阿希矿区地表形变呈现出整体基本趋于稳定状态、局部沉降较为明显的特征。造成矿区沉降的主要因素为矿产开采、地质构造、降水及露天矿井蓄水等。本研究可为矿区地面沉降监测以及今后地下矿物的合理开采提供科学依据。
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关键词:
- 阿希矿区 /
- SBAS-InSAR /
- 地面沉降 /
- 时空变化监测 /
- 驱动因素
Abstract: The Axi mining area in Xinjiang has a complex geographical environment. The long-term exploitation of mineral resources has caused severe ground subsidence and deformation in the mining area, as well as safety hazards of mining and production and the destruction of the surrounding ecological environment. This study aims to further investigate and analyze the spatial-temporal variation characteristics of the ground subsidence and the patterns of surface deformation in the Axi mining area. To this end, this study first calculated the land subsidence using the small baseline subset-interferometric synthetic aperture Radar (SBAS-InSAR) technique based on the 127 scenes descending Sentinel-1A images acquired from February 9, 2017 to April 25, 2021. Then, it compared the subsidence monitoring results obtained using the InSAR technique with the leveling results for verification. Finally, this study analyzed the spatial-temporal variation characteristics of land subsidence in the Axi mining area in recent five years and investigated the driving factors for the land subsidence. The results show that the surface deformation of the Axi mining area showed a roughly stable trend and significant local subsidence throughout the monitoring period. The main factors affecting the ground subsidence included mineral exploitation, geological structure, precipitation, and the impoundment of open-pit mines. This study will provide a scientific basis for ground subsidence monitoring and the future proper exploitation of underground minerals in the Axi mining area.-
Key words:
- Axi mining area /
- SBAS-InSAR /
- land subsidence /
- spatial-temporal change monitoring /
- driving factor
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