D-InSAR技术用于水西沟火区地表沉降的分析

Analysis of surface subsidence in Shuixigou sealed fire area by using D-InSAR technology

为掌握准南煤田水西沟火区地表沉降变化规律,采用差分干涉测量方法,对2014年10月至2015年10月Sentinel-1数据进行处理,获得11组干涉图、差分干涉图、去平地效应图、相位解缠效果图和地面形变图。对比分析了2014年和2015年沉降分布图像,结果表明火区地下煤火燃烧导致的沉降范围大体一致,沉降高低值呈现相似规律变化。结合遥感技术接受或者拒绝了因温度和植被的异常像元确定的火区范围,圈定出较为精确的A、B、C、D、E共5个裂隙位置,并发现这5个位置沉降高低值变化不一。其中A、B、C位置地表沉降最大值随着时间变化一直减小,D、E位置地表沉降最大值先增大后减小;C位置沉降幅度变化最小,相对较稳定。应用表明,利用差分干涉方法监测地下煤火燃烧区地表沉降是可行的,且具有一定的准确性。

In order to master the change law of surface subsidence in Shuixigou sealed fire area of Zhunnan Coalfield,the Sentinel-1 data from October 2014 to October 2015 were processed by differential interferometry method,and 11 sets of interferograms,differential interferograms,deplaning effect maps,unwrapping effect maps,and ground deformation maps were obtained.Comparing and analyzing the subsidence distribution images in 2014 and 2015,it shows that the subsidence range caused by underground coal fire in the study fire area is roughly the same,and the subsidence value shows similar regular changes.Combining remote sensing technology to accept or reject the sealed fire area determined by the abnormal pixels of temperature and vegetation,five more precise fissure positions A,B,C,D and E are delineated,and the five positions have different changes in subsidence values.Among them,the maximum value of surface subsidence of A,B,and C decreases with time,and the maximum value of surface subsidence of D and E increases first and then decreases;the change in subsidence of C has the smallest change and is relatively stable.The application shows that it is feasible and accurate to use differential interferometry to monitor the ground surface subsidence in underground coal fire combustion areas.