基于小基线DInSAR技术的典型地区沉降监测

Settlement monitoring in typical area based on small baseline DInSAR technology

为了有效地监测城市地面沉降情况,以2003—2010年该区52景ASAR数据为研究对象,利用小基线DInSAR技术方法,通过连接、干涉、解缠、轨道精炼和去平、反演、二次反演、地理编码等步骤,对反演出的实验区2003—2010年的形变速率进行时序序列分析。结果表明:实验区地面抬升沉降主要分布在A区、B区、C区、D区(最大沉降速率达到每年11.1 mm),抬升区域主要分布在A区和D区(最大抬升速率达到每年9.2 mm),其余大部分地区的沉降和抬升速率不太明显。通过与以往的沉降研究成果进行对比,验证了该技术在地面表沉降监测中的可靠性和准确性,为后期研究及预测实验区地面沉降及抬升提供理论依据。

In order to effectively monitor the subsidence of urban land,52 map ASAR data from 2003 to 2010 in the area were taken as the research object,and the small baseline DInSAR technology was used to retrieve the data of a certain area from 2003 to 2010 through the steps of connection,interference,decoupling,orbit refining and leveling,inversion,secondary inversion and geocoding.The results showed that the uplift and subsidence are mainly distributed in area A,B,C and D(the maximum subsidence rate is 11.1 mm per year).The uplift area is mainly distributed in area A and D(the maximum uplift rate is 9.2 mm per year).The subsidence and uplift rate in most other areas is not obvious.The reliability and accuracy of this technology in surface subsidence monitoring are verified by comparing with previous research results,which provides theoretical basis for later research and prediction of settlement and uplift of test area.