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Land subsidence monitoring in sinking coastal areas using distributed fiber optic sensing: a case study

Author

Listed:
  • Su-Ping Liu

    (Nanjing University
    University of Leeds)

  • Bin Shi

    (Nanjing University)

  • Kai Gu

    (Nanjing University)

  • Cheng-Cheng Zhang

    (Nanjing University)

  • Ji-Long Yang

    (China Geological Survey)

  • Song Zhang

    (Nanjing University)

  • Peng Yang

    (Nanjing University)

Abstract

A number of coastal areas have been suffering from severe land subsidence, which draws worldwide attention. Quantifying the subsidence and the contribution of each compacting stratum is crucial to study its development mechanism. In this paper, the distributed fiber optic sensing (DFOS) technique based on Brillouin scattering was adopted to monitor land subsidence in a 100-m-deep borehole located in Tianjin, China. Vertical strain profile was obtained by a kind of fixed-point cable embedded in the borehole, and the DFOS-based land subsidence system successfully achieved a 2-year-period in-situ investigation of the soft soil. The results revealed that the land subsidence rate was 21.6 mm/a after 2017, and the strata deformation measurements were refined up to each 5-m-thickness in vertical direction. The compression strata were localized at shallow strata (3.4–38.4 m), and the dominant contributors were soft soil strata at depth of 3.4 m to 18.4 m that the contribution of every 5 m thick stratum from top to bottom was 34.4%, 27% and 19.1%, respectively. The subsidence and strata contribution obtained by DFOS were in good agreement with those of extensometers. The groundwater fluctuations and additional loading may be the significant triggering factors of the compaction of the soft soil. This study showed that the DFOS-based measurement is an effective approach for land subsidence monitoring and will be a supplement to existing techniques in coastal areas.

Suggested Citation

  • Su-Ping Liu & Bin Shi & Kai Gu & Cheng-Cheng Zhang & Ji-Long Yang & Song Zhang & Peng Yang, 2020. "Land subsidence monitoring in sinking coastal areas using distributed fiber optic sensing: a case study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 103(3), pages 3043-3061, September.
    • Handle: RePEc:spr:nathaz:v:103:y:2020:i:3:d:10.1007_s11069-020-04118-1
    DOI: 10.1007/s11069-020-04118-1
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    References listed on IDEAS

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    1. Stijn Temmerman & Patrick Meire & Tjeerd J. Bouma & Peter M. J. Herman & Tom Ysebaert & Huib J. De Vriend, 2013. "Ecosystem-based coastal defence in the face of global change," Nature, Nature, vol. 504(7478), pages 79-83, December.
    2. Jun Wang & Wei Gao & Shiyuan Xu & Lizhong Yu, 2012. "Evaluation of the combined risk of sea level rise, land subsidence, and storm surges on the coastal areas of Shanghai, China," Climatic Change, Springer, vol. 115(3), pages 537-558, December.
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    Cited by:

    1. Su-Ping Liu & Bin Shi & Kai Gu & Cheng-Cheng Zhang & Jian-Hui He & Jing-Hong Wu & Guang-Qing Wei, 2021. "Fiber-optic wireless sensor network using ultra-weak fiber Bragg gratings for vertical subsurface deformation monitoring," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 109(3), pages 2557-2573, December.

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