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苏州地区位于中国苏锡常地面沉降带,地面沉降严重影响了该地区的经济社会发展,因此对其进行地面沉降监测具有重要的意义。本文基于SBAS In SAR方法,利用27景ERS-2 SAR数据,反演了苏州地区2007-2010年地表年平均沉降速率分布图和时序沉降变化图,分析了该时间段地表沉降的时空演化特征。结果表明,在整个研究观测期,苏州地区整体呈现出“老区沉降趋缓,新区沉降较快”的特点。老城区(姑苏区及邻近的吴中区)地面沉降趋于缓和,年平均沉降速率在10 mm/a以下,无明显的沉降中心;而相对新发展的区域(相城区、工业园区和吴江区)则表现出明显的沉降特征,沉降速率普遍大于10 mm/a。其中,相城区年平均沉降速率大约为10~20 mm/a,局部地区沉降严重,速率可达或超过20 mm/a;工业园区年平均沉降速率约20 mm/a,最大累计沉降量在50 mm左右。吴江区地面沉降最为严重,表现出面积广、速率大的特点,其年平均沉降速率在20 mm/a左右,最大累计沉降量可达60 mm以上。
The Suzhou area is located in the land subsidence zone of the Chinese Soviet Union, Wuxi and Changzhou, and the land subsidence has seriously affected the economic and social development in the area. Therefore, it is of great significance to conduct land subsidence monitoring. Based on the SBAS In SAR method, the ERS-2 SAR data of 27 years are used to invert the annual mean annual sedimentation rate distribution and time series changes in Suzhou from 2007 to 2010. The temporal and spatial evolution characteristics of the surface subsidence are analyzed. The results showed that throughout the study period, the whole area of Suzhou showed the following characteristics: “the settling of old areas slowed down and the settlement of new areas was fast”. The land subsidence tends to be eased in the old urban area (Gusu District and the adjacent Wuzhong District). The annual average subsidence rate is below 10 mm / a with no apparent subsidence center. However, relatively new developed areas (Xiangcheng District, Industrial Park and Wujiang District ) Shows obvious sedimentation characteristics, the settlement rate is generally greater than 10 mm / a. Among them, the average annual sedimentation rate in Xiangcheng District is about 10-20 mm / a, and the settlement in some areas is serious at a rate up to or exceeding 20 mm / a. The average sedimentation rate in industrial parks is about 20 mm / a and the maximum cumulative settlement is 50 mm or so. The land subsidence is the most serious in Wujiang District, showing a wide area and a large velocity. The annual average sedimentation rate is about 20 mm / a and the maximum cumulative settlement is up to 60 mm.