基于InSAR和小波变换的不均匀沉降段识别——以京津高铁北京段为例  

Identification of Uneven Land Subsidence Segment Based on the InSAR and Wavelet Transformation: A Case Study of Beijing Section of Beijing-Tianjin High-Speed Railway

作　　者：朱锋[1,2,3] 宫辉力[1,2,3] 李小娟[1,2,3] 周超凡[1,2,3] 陈蓓蓓 

机构地区：[1]首都师范大学三维信息获取与应用教育部重点实验室,北京100048 [2]北京市城市环境过程与数字模拟国家重点实验室培育基地,北京100048 [3]首都师范大学资源环境与旅游学院,北京100048

出　　处：《地理与地理信息科学》2014年第1期23-27,F0002,共6页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(41171335/D010702);国家自然科学基金重点项目(41130744/D0107);国家973计划前期研究专项课题(2012CB723403);北京市自然科学基金项目(8101002);北京岩溶水资源勘查评价工程

摘　　要：地面沉降尤其是不均匀地面沉降对高速铁路运营安全具有重要影响,该文利用永久散射体干涉测量(PS-InSAR)技术及小波变换提取京津高铁北京段沿线的不均匀沉降信息,得到以下结论:1)北京平原地面沉降主要发生在昌平、顺义、朝阳及通州,最大地面沉降速度-30.64mm/a,其中朝阳区和通州区的不均匀沉降最为严重;2)京津高铁北京段存在3个主要的不均匀沉降段,其长度分别为18.84km、11.06km、3.6km,不均匀沉降段占该线路总长度的62.97%。研究表明,PS-InSAR方法可以获取区域地面沉降的空间分布趋势,小波变换可以有效去除数据噪声,从而利于铁路沿线不均匀沉降信息的提取。Land subsidence especially uneven land subsidence has an important influence to the high-speed railway. In this paper, PS-InSAR technology was used to obtain the spatial character of the land subsidence in Beijing plain. On the basis, using the wavelet transformation to remove the noise included the land subsidence data of the Beijing-Tianjin high-speed railway within Beijing,and taking the wavelet reconstruction to construct the data whose noise has been removed. Some important conclusions were acquired as follows： 1） Land subsidence phenomenon appeared mostly in Changping, Shunyi, Chaoyang and Tongzhou, the maximum land subsidence rate was -30.64 mm/a, the uneven land subsidence was serious in Chaoyang and Tongzhou which contained the high-speed railway. 2） Three uneven land subsidence sections can be recognized along the railway, the length was 18.84 km, 11.06 km and 3.6 km separately,the length occupied 62. 97% of the total length. This research showed that the PS- InSAR could extract the land subsidence information and the wavelet transformation could remove the noise within the data, with these ways, the uneven land subsidence information could be retried more conveniently.

关 键 词：京津高铁 不均匀沉降 PS-INSAR 小波变换 

分 类 号：P642.26[天文地球—工程地质学] P225[天文地球—地质矿产勘探]