WANG Peng,SHI Bo,ZHANG Bin,et al.Deformation Monitoring of the Baihetan Ultra-High Arch Dam Surface Using Short Temporal Baseline Subset GB-InSAR[J].Geomatics and Information Science of Wuhan University,2026,51(7):1440-1451.
WANG Peng,SHI Bo,ZHANG Bin,et al.Deformation Monitoring of the Baihetan Ultra-High Arch Dam Surface Using Short Temporal Baseline Subset GB-InSAR[J].Geomatics and Information Science of Wuhan University,2026,51(7):1440-1451.DOI:10.13203/j.whugis20250043
Deformation Monitoring of the Baihetan Ultra-High Arch Dam Surface Using Short Temporal Baseline Subset GB-InSAR
The conventional dam deformation monitoring method has been demonstrated to be capable of reflecting the displacement of typical dam sections and elevations. However
the density of measuring points is often inadequate
with important parts consequently being missed. Ground-based synthetic aperture radar interferometry (GB-InSAR) has emerged as an effective means of monitoring regional deformation of dam surfaces. Nevertheless
the precision of long-term sequential monitoring is frequently compromised by atmospheric disturbances
which significantly impede the ability to obtain reliable deformation measurements through single-master time series InSAR analysis.
Methods
2
In order to address this issue
improvements were made to the GB-InSAR time series technology. The optimized approach used continuous imagery acquired during periods of stable meteorological conditions to compute average image sequences
which were then used to construct short temporal baseline interferometric pairs. Atmospheric phase correction was then applied to the interferograms using high-quality pixel (HQP) identified in stable regions
enabling precise deformation inversion. The proposed method was applied to the long-term deformation monitoring of the Baihetan ultra-high hyperbolic arch dam. A comparative analysis was conducted between the time-series GB-InSAR results and the traditional monitoring method
based on the accurate identification of HQP across the dam surface.
Results
2
Except for localized regions affected by the sidelobe effect of deep outlets
the deformation sequences derived from both methods at multiple plumbline observation sites exhibit a high degree of consistency
with root mean square error values of approximately 2 mm. Furthermore
the deformation center of the dam
as identified by the GB-InSAR technique
is located at the top of the 16th dam section
which is consistent with the results obtained from numerical simulations.
Conclusions
2
The proposed method has the capacity to overcome the interference of severe atmospheric variations in near-water regions and address the issue of diurnal deformation signals being mixed with atmospheric phases in GB-InSAR
which facilitates high-precision measurements of long-term dam surface deformation. The approach provides critical technical support for safety analysis and structural deformation interpretation of high arch dams.
关键词
Keywords
references
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