基于PSInSAR技术的珠海市地表沉降监测与归因分析

Subsidence monitoring and analysis of Zhuhai based on PSInSAR technology

为明确珠海市地表沉降s时序变化特征及其原因,通过PSInSAR技术对2017-2019年55景Sentinel-1A数据进行处理和分析,利用CORS站设置连续观测水准点的方法对获取的沉降结果进行验证。结果表明,该方法监测结果与水准测量成果间的相关系数R 2为0.6420,RMSE为3.8114mm/y,珠海市明显沉降区域主要分布在高栏港经济区,鸡啼门河道两侧和白蕉镇,以及横琴新区,调查发现沉降原因主要是人为的填海造陆及未固结软土下沉,其中由于工程建设导致的沉降占总沉降面积的8.74%,填海造成的沉降占17.75%,由于未固结软土下沉导致的沉降占73.51%。研究结果可为珠海市的城市建设和灾害防治提供科学依据。

To clarify the temporal variation characteristics and causes of time-series changes of surface subsidence in Zhuhai,the data of 2017-2019 years and 55 scenes Sentinel-1A were processed and analyzed by PSInSAR technology,and the settlement results were verified by setting up continuous observation leveling points at CORS station.The results show that the correlation coefficient R 2 between the monitoring results and the leveling results is 0.6420,and the RMSE is 3.8114mm/y.The remarkable settlement areas of Zhuhai are mainly distributed in Gaolan Port Economic Zone,both sides of the Jitimen River,Baijiao Town and Hengqin.It is found that the main causes of settlement was artificial land reclamation and unconsolidated soft soil subsidence.The settlement caused by the project construction accounted for 8.74%of the total settlement area,the settlement caused by reclamation made up for 17.75%,and the settlement caused by subsidence of unconsolidated soft soil occupied 73.51%.The results can provide a scientific basis for urban construction and disaster prevention in Zhuhai city.