城市地面沉降水准测量与InSAR监测对比分析

Comparative Analysis of Urban Land Subsidence Leveling and InSAR Monitoring

阐述了城市地面沉降监测中水准测量与InSAR(in⁃terferometric synthetic aperture radar)监测的适用性,分析了地面沉降水准测量数据平差中单点起算和拟稳基准起算对沉降的数学模型,提出了多期水准测量结果与InSAR监测结果的对比分析方法。以杭州市为例,利用2014年、2017年、2019年、2020年、2021年共5期一、二等水准观测数据和2015—2017年、2017—2019年、2017—2020年、2019—2021年共4期InSAR监测数据,研究发现地面沉降水准测量数据平差中采用拟稳基准更有利于对沉降的分析研究,大量的水准测量结果与InSAR监测结果验证数据组表明两者具有明显的线性关系,两种技术方法对地面沉降的诠释整体表现一致,吻合较好。将两种技术方法有效融合的建设思路,可以为新一线城市规划和地面沉降监控提供科学的决策依据。

This paper expounds the applicability of leveling and InSAR monitoring in urban land subsidence monitoring,analyzes the mathematical models of single-point calculation and quasi-stable datum calculation for subsidence in the adjust⁃ment of land subsidence leveling data,and proposes multiphase leveling results and InSAR Comparative analysis meth⁃od of monitoring results.Taking Hangzhou City as an exam⁃ple,using the first and second level observation data of the five phases of 2014,2017,2019,2020 and 2021 and the four phases of InSAR monitoring data of 2015-2017,2017-2019,2017-2020 and 2019-2021,the research found that The use of quasi-stable datums in the adjustment of land subsidence level⁃ing data is more conducive to the analysis and research of sub⁃sidence.A large number of leveling results and InSAR moni⁃toring results verify that the data sets have an obvious linear relationship.The overall performance of the interpretation is consistent,and the agreement is fine.The construction idea of effectively integrating the two technical methods can pro⁃vide a scientific decision-making basis for the planning of new first-tier cities and monitoring of land subsidence.