摘要
为探究长沙市主城区的地表沉降情况,以2020年7月—2022年7月覆盖长沙市中心城区32景sentinel-1A数据为数据源,使用永久散射体合成孔径雷达干涉技术(PS-InSAR)和小基线集合成孔径雷达干涉技术(SBAS-InSAR)对研究区地表形变信息进行了反演,主要得到以下几点结论:1)在监测时段内,研究区域存在地面沉降问题,大部分地区地表形变趋于稳定,且最大年沉降速率约-24 mm/a,沉降较为严重且分布范围较广的区域位于望城区和开福区;2)2种反演结果在沉降区域空间分布上具有高度一致性,累计沉降量和形变速率量级上具有较小的差异和显著相关性;3)结合历史影像、地质特征、土壤特性等因素分析,发现引起长沙市主城区不均匀地面沉降的原因主要是受地质情况、建筑和道路等城市工程建设活动等因素的影响。
In order to explore the land surface subsidence in the main urban area of Changsha city,32 views sentinel-1A data covering the downtown area of Changsha city from July 2020 to July 2022 were taken as data sources.The permanent scatterer Synthetic Aperture Radar Interferometry(PSInSAR)and small baseline Ensemble Aperture Radar Interferometry(SBAS-InSAR)were used to invert the surface deformation information in the study area,and the following conclusions were obtained:1)During the monitoring period,the surface deformation in most areas tends to be stable,and the maximum annual subsidence rate is about-24 mm/a.Wangcheng district and Kaifu district are the areas with serious subsidence and wide distribution.2)The two inversion results have a high degree of consistency in the spatial distribution of subsidence area.There is a small difference and significant correlation between cumulative subsidence and deformation rate.3)Based on the analysis of historical images,geological characteristics,soil characteristics and other factors,it is found that the causes of uneven land subsidence in the main urban area of Changsha are mainly influenced by geological conditions,construction,road and other urban engineering construction activities.
作者
蔡文
刘向铜
付顶瑶
吴鹏
张峰雪
曹秋香
CAI Wen;LIU Xiangtong;FU Dingyao;WU Peng;ZHANG Fengxue;CAO Qiuxiang(School of Surveying and Geoinformation Engineering,East China University of Technology,330013,Nanchang,PRC;Key Laboratory of Mine Environmental Monitoring and Improving around Poyang Lake of Ministry of Natural Resources,East China University of Technology,330013,Nanchang,PRC;School of Earth Sciences,East China University of Technology,330013,Nanchang,PRC)
出处
《江西科学》
2023年第4期690-696,723,共8页
Jiangxi Science
基金
国家自然科学基金项目(42062013)
江西省教育厅项目(GJJ200726)
江西省防震减灾与工程地质灾害探测工程研究中心开放基金资助项目(SDGD202004)
江西省哲学社会科学重点研究基地项目(21JDJC01)。
