
科学技术与工程

中国技术经济学会
SBAS-InSAR Time Series Deformation and Its Response in Ground Monitoring Datasets in Tianjin LNG Dock
Chao SUN , Ya-nan CHEN , Wen-xing FENG , Bing-chuan YAN , Fu-li YAN
Science Technology and Engineering ›› 2024, Vol. 24 ›› Issue (15) : 6502 -6509.
In order to investigate the effectiveness of an integrated space-ground monitoring technology that consists of spaceborne radar interferometry, global navigation and positioning system (GNSS) deformation monitoring, underground displacement sensor monitoring, and pipeline stress-strain monitoring in major oil and gas infrastructure SBAS-InSAR technology to extract long-term surface deformation data in the Tianjin LNG (liquefied natural gas) terminal area was employed. Additionally, the relationship between ground GNSS surface displacement, multi-depth displacement meters, pipeline strain sensor data, and synchronous SBAS-InSAR surface deformation data was examined. Furthermore, the temporal variation patterns of rainfall-drought cycles was analyzed. The findings of this study indicate that the non-uniform settlement in the Tianjin LNG terminal area was most significant over the three-year period from May 2019 to April 2022, with a maximum value of -394 mm. Analysis of the temporal deformation data derived from SBAS-InSAR revealed subsidence deformation ranging from 15 ~ 53 mm, while ground displacement measured by GNSS exhibited responses ranging from 9 ~ 57 mm. There was a strong correlation and consistency between the two measurements. The changes in SBAS-InSAR surface deformation were closely linked to precipitation, as observed by multi-depth displacement meters at depths of 1 m, 2 m, and 3 m. These changes demonstrated significant fluctuations between the rainy and dry seasons, exhibiting good synchronization. This suggests that the characteristics of SBAS-InSAR surface deformation can effectively depict the displacement patterns of underground soil layers. Additionally, the surface subsidence measured by SBAS-InSAR showed a positive correlation with underground pipeline strain, indicating that SBAS-InSAR surface deformation data serve as a reliable indicator for assessing the strain in underground pipelines. The integrated application of spaceborne radar interferometry, ground-based GNSS deformation monitoring, underground displacement sensor monitoring, and pipeline stress-strain monitoring in a space-ground integrated monitoring system can provide valuable insights for the future development of pipeline safety monitoring technologies.
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