基于SBAS-INSAR的德兴矿区沉降监测与分析

Monitoring and Analysis of Sedimentation in Dexing Mining Area Based on SBAS-InSAR

以江西省德兴市矿区为例,采用小基线集技术即广域差分增强系统-干涉雷达(Satellite-Based Augmentation System-Interferometric Synthetic Aperture Radar,SBAS-InSAR)技术处理该区域2018年12月29日至2019年12月24日共30景升轨哨兵1号(Sentinel-1A)数据,对该矿区进行地表沉降分析。研究结果表明,研究区内有三处明显沉降,分布在研究区的西南部、东南部以及北部,其中西南部沉降最为严重,最大年平均沉降速率为490 mm/a。针对沉降较为严重的区域选点进行特征点时序分析,结果表明,选取的特征点随着时间的推移其累积沉降量逐渐增大,并在研究时间跨度之内没有减缓的趋势,矿区持续开采诱发的地面沉降会给地质结构和周围居民的生活产生一定影响。

Taking the mining area of Dexing City in Jiangxi Province as an example,the SBAS-InSAR technology was applied to process the data of 30 elevated Sentinel-1A from 29th December,2018 to 24th December,2019,and the surface subsidence of the mining area was analyzed.The results showed that there were three obvious settlements in the study area,which were distributed in the southwest,southeast and north of the study area.The settlement in the southwest was the most serious,and the maximum annual average settlement rate was 490 mm/a.The time series analysis of feature points was carried out for the selected points in regions with serious settlement.It demonstrated that the cumulative settlement of the selected feature points increased gradually with time,and the trend did not slow down within the research time span.Land subsidence induced by continuous mining would have a certain impact on the geological structure and the lives of the surrounding residents.