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地面沉降是中国乃至世界许多地区面临的严重环境地质问题,合成孔雷达干涉测量(In SAR)技术是地面沉降监测的主要手段。雅加达与中国上海、广州等城市在环境上具有相似性,也是21世纪海上丝绸之路的重要节点城市。以雅加达为例研究地面沉降监测方法技术,既为中国沿海城市的地面沉降防治提供借鉴,又为“一带一路”战略提供有用数据。基于2010年6月—2011年3月期间获取的12景3m空间分辨率的Terra SAR-X数据,围绕小基线子集(SBAS)和两轨法开展了研究。SBAS获取的平均沉降速率图显示,在雅加达西北部、东部及靠近东雅加达的勿加泗市北侧有5个明显的沉降中心,最大沉降速率可达9cm/a。对两轨法差分干涉图序列的分析发现,勿加泗市北侧沉降中心2010年12月—2011年1月期间44天的沉降量达到6cm,具有显著的非线性形变特征。研究表明,采用高分辨率SAR数据,合理应用In SAR技术,能够为雅加达及其类似城市的地面沉降防控提供支持。
Land subsidence is a serious environmental and geological problem in many parts of China and even in the world. Synthetic borehole interferometry (In SAR) is the main means of land subsidence monitoring. Jakarta and China Shanghai, Guangzhou and other cities in the environmental similarity, but also the twenty-first Century Maritime Silk Road, an important node in the city. Taking Jakarta as an example to study the technology of ground subsidence monitoring methods, it not only provides reference for the prevention and control of land subsidence in coastal cities in China, but also provides useful data for the “Belt and Road” strategy. Based on the Terra SAR-X data of 12 scenes with spatial resolution of 3 m obtained from June 2010 to March 2011, the study was conducted on a small baseline subset (SBAS) and two-track method. The average sedimentation rates obtained by SBAS show that there are 5 distinct subsidence centers to the northwest of Jakarta, to the east, and to the north of Bekasi, near East Jakarta, with a maximum sedimentation rate of up to 9 cm / a. The analysis of the two-track differential interferogram reveals that the settlement of 44 days during December 2010 to January 2011 in the sedimentation center to the north of Bekasi reaches 6 cm with significant nonlinear deformation. Research shows that the use of high-resolution SAR data and the rational application of In SAR technology can support ground subsidence prevention and control in Jakarta and similar cities.