首页|潮汐效应对沿海多条带时序InSAR地表形变监测的影响

潮汐效应对沿海多条带时序InSAR地表形变监测的影响

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潮汐效应对沿海大范围、高精度的合成孔径雷达干涉测量(Interferometric Synthetic Aperture Radar,InSAR)技术地表形变监测的影响不可忽略.潮汐效应中的固体潮(Solid Earth Tide,SET)位移和海洋潮汐负荷(Ocean Tide Loading,OTL)位移会在时间和空间域上对沿海大范围InSAR地表形变监测产生分米级的误差,而且不同条带中地表潮汐形变时空差异性会对多条带InSAR影像拼接产生较大误差.本文针对沿海地区多条带InSAR形变时序,重点分析了潮汐效应在不同条带InSAR地表沉降监测中的影响,并采用多种潮汐位移估计方法对多条带地表潮汐形变进行改正.结果表明,研究区域不同条带时序InSAR中地表潮汐形变具有较大的时空差异性,其造成沿海地区相邻条带时序InSAR地表沉降速率差异能达到1～2 cm·a-1;通过固体潮模型、海潮负荷模型或GPS参考站网海潮位移改正,能够消除不同条带中地表潮汐形变时空差异性对时序InSAR形变结果拼接产生的空间高阶非线性误差,弥补了传统拼接方法在拟合潮汐位移偏差的不足.在大气延迟误差改正的基础上,时序InSAR形变残差的标准差(Standard Deviation,STD)由潮汐改正前的2.3 cm减少至0.75 cm;本文研究揭示了沿海地表潮汐形变改正对多条带时序InSAR形变结果拼接的重要性,可大幅提高沿海地区广域时序InSAR地表形变监测的精度.
The tidal effect on the coastal ground deformation monitoring of multi-strips InSAR time series
The impact of tidal effects on the large-scale and high-precision Interferometric Synthetic Aperture Radar(InSAR)technology for monitoring surface deformation in coastal areas cannot be ignored.Solid Earth Tide(SET)displacement and Ocean Tide Loading(OTL)displacement in tidal effects will introduce decimeter errors in time and space for large-scale InSAR surface deformation monitoring along coastal areas,and the spatio-temporal difference of tidal surface deformation in different bands will introduce large errors for multi-band InSAR image stitching.This article focuses on the impact of tidal effects on the monitoring of surface subsidence in multiple InSAR bands in coastal areas,and uses various tidal displacement estimation methods to correct for tidal surface deformation in multiple bands.The results indicate that there are significant spatio-temporal differences in tidal surface deformation in InSAR of different strip time series in the study area,which can result in a difference in surface subsidence rate of 1～2 cm ·a-1 between adjacent strip time series in coastal areas;By using solid tide models,ocean tide loading models,or GPS reference station network ocean tide displacement corrections,the spatial high-order nonlinear errors caused by the spatio-temporal differences in tidal surface deformation in different bands can be eliminated in the concatenation of InSAR time series deformation results,thus compensating for the shortcomings of traditional concatenation methods in fitting tidal displacement deviations.On the basis of the correction of the atmospheric delay error,the standard deviation(STD)of the InSAR temporal deformation residual is reduced from 2.3 cm before the tidal correction to 0.75 cm;This study demonstrates the importance of tidal deformation correction in coastal areas for the concatenation of deformation results from multiple time series InSAR,which can significantly improve the accuracy of wide-area time series InSAR surface deformation monitoring in coastal areas.

Solid Earth TideOcean Tide LoadingCoastal deformation monitoringInSARMulti strip splicing

胡文杰、彭葳、刘斌、邢学敏、朱珺、林东方

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长沙理工大学湖南省公路先进建养技术国际科技创新合作基地,长沙 410114

长沙理工大学交通运输工程学院,长沙 410114

湖南科技大学地理空间信息技术国家地方联合工程实验室,湖南湘潭 411201

固体潮 海洋潮汐负荷 沿海形变监测 InSAR 多条带拼接

国家自然科学基金湖南省自然科学基金长沙理工大学湖南省公路先进建养技术国际科技创新合作基地开放基金长沙理工大学湖南省公路先进建养技术国际科技创新合作基地开放基金湖南省自然资源厅科技项目

422040462022JJ40472kfj210802kfj19080520230118

2024

10.6038/cjg2023Q0873

地球物理学报
中国地球物理学会 中国科学院地质与地球物理研究所

地球物理学报

CSTPCD北大核心
影响因子：3.703
ISSN：0001-5733
年,卷(期)：2024.67(4)
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