基于PSI技术的芜湖市地面沉降时空特征分析

城市的沉降监测有利于了解区域实时高程，可为地质灾害与防护部门提供数据依据，避免因高程损失而带来的地质灾害。基于2016年1月至2017年12月共22景Sentinel-1A干涉宽幅模式影像数据，利用永久散射体合成孔径雷达干涉测量技术以及合成孔径雷达差分干涉测量技术进行芜湖市地表形变监测，并分析研究区地面沉降的时空分布特征。空间上，阐述芜湖市地面沉降的整体格局，再以道路为专题，分析了道路的沉降分布格局。时间上，以时间为基线，逐月分析地面沉降部分在年内的具体变化。结果表明：空间上，芜湖市地面沉降主要集中在长江以东的范围，呈现出由西向东逐渐增加的趋势，长江以西呈现零星漏斗式沉降分布，其中，沉降累积量也与道路的密度与建设相关，道路汇集区与修建区域的沉降累积量较大；时间上，研究区整体沉降量各月变化较均匀，其中，沉降量变化范围在6月最大，10月与11月最小。

Analysis of Temporal and Spatial Characteristics of Ground Subsidence in Wuhu City based on PSI Technology

The settlement monitoring in the city is conducive to the understanding of the regional real-time elevation, which can provide the data basis for the geological disaster and protection department to avoid the geological disasters caused by the loss of elevation. Based on January 2016 to December 2017, a total of 22 scenes Sentinel-1A wide interference pattern of imaging data, the surface deformation monitoring of Wuhu city was carried out using PSI and DInSAR technology, and the spatial and temporal distribution characteristics of ground subsidence in the study area were analyzed. In space, the overall pattern of ground subsidence in Wuhu city is expounded, and the settlement distribution pattern of the road is analyzed. In time, monthly analysis of land subsidence in the specific changes in the year. Results show that the spatially, Wuhu, the range of land subsidence mainly concentrated in the east of the Yangtze river, presents the trend of increase gradually from west to east, west of the Yangtze river region of land subsidence is sporadic funnel type distribution. Among them, the settlement accumulation is also related to the density of the roads and the construction of roads, the settlement accumulation of road gathering area and construction area is large. In terms of time, the overall settlement volume of the study area was more uniform in each month, among which the variation range of settlement volume was the largest in June, and the smallest in October and November.