百年煤城地表沉降融合PS/SBAS InSAR监测——以徐州市为例

融合PS/SBAS算法成为当前InSAR技术的研究热点,本文通过融合PS/SBAS的优势,利用128景ALOS PALSAR影像和24景Radarsat-2影像获取了百年煤城徐州地区2007—2015年的地表形变场及变化趋势。试验结果表明:12007—2011年,徐州主要有4个沉降区,分布在沛县、丰县、铜山区和贾汪区。22012—2015年,沛县、丰县和铜山区地表沉降范围有所扩大;贾汪区地表沉降范围和速率明显减小,说明近年来贾汪区重点治理采矿塌陷工作已初步见效;另外,睢宁县县城出现明显沉降。3已有文献对沛县大屯中心区的沉降监测结果验证了试验结果是可靠的。4首次提取了徐州近8年间地表沉降的信息,可为该地区开展地表沉降调查监测与防治工作提供参考;试验方法可为全国开展地表沉降调查监测工作提供参考。

Ground Deformation over Century-long Coal Mining City Monitored through Incorporating Both PS and SBAS InSAR:A Case Study of Xuzhou

The algorithm fusion of permanent scatterers interferometric SAR (PS InSAR) and small baseline subset interferometric SAR (SBAS InSAR) has become a hot spot of InSAR technology.By fusing the advantages of PS/SBAS,128 ALOS PALSAR images (from 2007to 2011) and 24 Radarsat-2 images (from 2012 to 2015) are used to extract the ground deformation field and trend in recent 8 years over Xuzhou region with century-long coal mining history.The experiment results demonstrate that:① From 2007 to 2011,four main subsidence areas have been found in Xuzhou,locating in Peixian County,Fengxian County,Tongshan District and Jiawang District.② From 2012 to 2015,the subsidence range of Peixian County,Fengxian County and Tongshan District is expanding;however,the subsidence range and rate of Jiawang District decrease significantly.The phenomenon shows that the governance of mining subsidence in Jiawang District has achieved good results in recent years.In addition,there comes into apparent subsidence in Suining County.③ The results of this experiment has been validated by the published research results on ground subsidence in Datun Center District,Peixian County.④ The results represents the firstever subsidence information in the recent 8 years in Xuzhou,which can be applied to monitor and control the subsidence in this area.The monitoring result is of high significance for monitoring and control,prevention and mitigation of ground subsidence disaster over the region.