Application of L‐band differential SAR interferometry to subsidence rate estimation in reclaimed coastal land
Application of L‐band differential SAR interferometry to subsidence rate estimation in reclaimed coastal land
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DOI：
10.1080/01431160512331326620
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发表时间：
2005-04
影响因子：
3.4
通讯作者：
Sun Woong Kim;Chang-Wook Lee;Kyo-Young Song;Kyungduck Min;Joong-Sun Won
中科院分区：
文献类型：
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作者：
Sun Woong Kim;Chang-Wook Lee;Kyo-Young Song;Kyungduck Min;Joong-Sun Won
采用JERS - 1 L波段SAR二通差分干涉测量技术，对某滨海复垦土地的沉降速率进行了估算。由于需要基于稀疏分布野外测量的二维沉降图，因此难以获得填海过程中沉降率的测量。由于频繁的土体加载和强烈的变形梯度引起的严重的时间解相关，L‐波段是观测填海造地沉降的有效波段。我们利用来自42个地面站的磁探延伸仪获得的现场测量数据，评估了估计沉降率的准确性。由7对符合条件的沉降图生成二维沉降图。二维雷达测量值与现场数据的相关系数R为0.87，均方根误差为1.42 cm。从相邻的JERS‐1路径获得的两个干涉测量对也被用来验证结果。两种不同JERS‐1路径的独立估计值相互相关，相关系数R分别为0.97和0.80。误差的主要来源是参考DEM误差和稳定点相位波动计算的附加相位噪声。这两个源的误差为±1.27 cm。352天内最大沉降量约为60 cm。结果表明，L波段差分SAR干涉测量在地质工程应用中是一种有用的工具。
The subsidence rate in a reclaimed coastal land has been estimated by using JERS‐1 L‐band SAR two‐pass differential interferometry. Measurement of subsidence rate during reclamation is difficult to obtain as a two‐dimensional subsidence map based on sparsely distributed field measurements is required. Owing to the severe temporal decorrelation induced by frequent soil loading and intense deformation gradients, the L‐band was found to be effective for observing subsidence in reclaimed land. We evaluated the accuracy of the estimated subsidence rate using field measurements obtained by a magnetic probe extensometer from 42 ground stations. A two‐dimensional subsidence map was generated from seven qualified pairs. The correlation coefficient R between the two‐dimensional radar measurements and the in situ data was 0.87 with a rms error of 1.42 cm. Two interferometric pairs obtained from an adjoining JERS‐1 path were also used to verify the results. Independent estimations from the two different JERS‐1 paths correlated each other with correlation coefficients R of 0.97 and 0.80. The main sources of the error were the reference DEM errors and additional phase noises calculated from phase fluctuation at stable points. The error from these two sources was ±1.27 cm. The estimated maximum subsidence was about 60 cm over 352 days. The results demonstrate that L‐band differential SAR interferometry is a useful tool in geological engineering applications.