| 摘要: |
| 为探明九龙江河口地区地面沉降情况，本研究采用小基线集合成孔径雷达干涉测量（small baseline subset interferometric synthetic aperture radar, SBAS-InSAR）和永久散射体合成孔径雷达干涉测量（persistent scatterer interferometric synthetic aperture rader, PS-InSAR）技术获取了2017年1月至2022年3月地面沉降的时空分布信息和演变规律，并结合实地调查数据和水文地质调查监测资料对地面沉降成因进行了系统分析。研究结果表明：SBAS-InSAR和PS-InSAR两种方法均发现在研究期间九龙河口地区地面整体呈现出沉降趋势，SBAS-InSAR监测结果发现研究区沉降速率为6.2 mm/a；研究期间该区域的沉降中心持续扩大且沉降量呈增加趋势，最大累积沉降量达到250 mm以上，主要分布在浮宫镇中南部地区、海澄镇、东园镇中南部地区、角美镇和榜山镇东南部地区；该区域由于大量抽取地下水用于养殖，地下水位下降，引起淤泥层发生固结排水、压密，从而导致地面沉降。 |
| 关键词: 海洋地质学 地面沉降 Sentinel-1A 时序InSAR技术 九龙江河口 |
| DOI：10.3969/J.ISSN.2095-4972.20221019001 |
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| 基金项目:国家重点研发计划（2022YFF1301301）；中国地质调查局地质调查项目（1212011220944，DD20230459） |
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| Spatial-temporal variation characteristics and causes analysis of ground deformation in Jiulong River Estuary area by time series InSAR |
| LIU Chunlei,ZHANG Yuanjing,LU Chenming,LI Yasong,LI Jianfeng |
| (Fujian Provincial Key Laboratory of Water Cycling and EcoGeological Processes, Xiamen 361021, China;Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Science, Shijiazhuang 050061, China) |
| Abstract: |
| To investigate the spatial-temporal variation characteristics of ground deformation in Jiulong River Estuary area, this study development laws and causes of land subsidence in this area used the Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) technique and the Permanent Scatters Interferometric Synthetic Aperture Radar (PS-InSAR) technique to obtain spatiotemporal distribution information and evolution patterns of ground deformation from January 2017 to March 2022. In addition, we conducted a comprehensive field investigation data and hydrogeological environmental data to systematically analyze the causes of land subsidence in the study area. Results show that both SBAS-InSAR and PS-InSAR methods consistently revealed that during the study period, the surface area of Jiulong River Estuary showed a subsidence trend as a whole, with an average annual subsidence rate of 6.2 mm/a based on the SBAS-InSAR analysis. According to the development law of surface deformation in time series, the subsidence center of the study area continued to expand and the subsidence amount gradually increased. During the study, the maximum cumulative deformation amount reached more than 250 mm, mainly distributed in the central and southern part of Fugong and the central and southern parts of Haicheng and Dongyuan and in regions of Southeastern Komei and Bangshan. Due to large amount of groundwater pumped for aquaculture in this area, the groundwater level has dropped, causing the silt layer to be consolidated, drained and compacted, and resulting in ground deformation. |
| Key words: marine geology ground deformation Sentinel-1A time series InSAR Jiulong River Estuary |
