scholarly journals Application of distributed fiber optic sensing technique in land subsidence monitoring in coastal areas: a case study in Tianjin, China

2020 ◽  
Vol 382 ◽  
pp. 137-141
Author(s):  
Su-Ping Liu ◽  
Bin Shi ◽  
Kai Gu ◽  
Cheng-Cheng Zhang ◽  
Song Zhang ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Fiber Optic ◽  
Brillouin Scattering ◽  
Coastal Areas ◽  
The Novel ◽  
Fiber Optic Sensing ◽  
Monitoring Technologies ◽  
Subsidence Monitoring ◽  
Good Agreement

Abstract. Land subsidence is a worldwide geohazard caused by various factors, and its direct impact is loss of elevation, which is especially severe in coastal areas due to sea level rise. Quantifying contributions of compressed strata is significant for evaluating the subsidence. In this paper, we used distributed fiber optic sensing (DFOS) with Brillouin scattering to monitor the strain distribution along optical cables embedded in a borehole located in Tianjin, China. The novel technique revealed that the land subsidence rate was 21.2 mm a−1 from 2017 to 2019. The strata contributed to the subsidence have been identified in the range of 3 to 35 m. The results showed good agreement with those obtained by a group of extensometers. We demonstrated that DFOS could be a supplement to land subsidence monitoring technologies in coastal areas.

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

2020 ◽  
Vol 103 (3) ◽  
pp. 3043-3061
Author(s):  
Su-Ping Liu ◽  
Bin Shi ◽  
Kai Gu ◽  
Cheng-Cheng Zhang ◽  
Ji-Long Yang ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Fiber Optic ◽  
Coastal Areas ◽  
Fiber Optic Sensing ◽  
Subsidence Monitoring

scholarly journals Land subsidence monitoring using distributed fiber optic sensing with Brillouin scattering in coastal and deltaic regions

2020 ◽  
Vol 382 ◽  
pp. 95-98
Author(s):  
Kai Gu ◽  
Su-Ping Liu ◽  
Bin Shi ◽  
Yi Lu ◽  
Yue-Hua Jiang
Keyword(s):  
Land Subsidence ◽  
Land Surface ◽  
Fiber Optic ◽  
Brillouin Scattering ◽  
Surface Displacement ◽  
Yangtze River Delta ◽  
Deformation Distribution ◽  
Conventional Methods ◽  
Fiber Optic Sensing ◽  
Subsidence Monitoring

Abstract. Excessive withdrawal of groundwater in coastal and deltaic regions is one of the main reasons which induce land subsidence in these areas. Land surface displacement monitoring with conventional methods is not able to pinpoint subsurface compacting, which is very challenging. Instead of groups of extensometers, we apply distributed fiber optic sensing (DFOS) with Brillouin scattering in vertical boreholes to identify the deformation distribution along the entire borehole with meter-scale spatial resolution. We here present 10 boreholes with depths range from 100 to 600 m with DFOS monitoring along the east coastal line of Jiangsu and Shanghai since 2015, and 1 borehole of 300 m in depth in Yangtze River delta since 2012. The results provide clear images on the deformation distribution along entire boreholes, by identifying the main contributors to the subsidence and the deformation evolutionary processes, with stable long-term monitoring performance. Hence, we demonstrate that DFOS can open window into subsurface deformation and could be important complementary to conventional methods to understand the land subsidence processes in coastal and deltaic regions.

Application of distributed fiber optic sensing technique in land subsidence monitoring

2015 ◽  
Vol 5 (5) ◽  
pp. 587-597 ◽  
Author(s):  
Jinghong Wu ◽  
Hongtao Jiang ◽  
Jingwen Su ◽  
Bin Shi ◽  
Yuehua Jiang ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Fiber Optic ◽  
Fiber Optic Sensing ◽  
Subsidence Monitoring

scholarly journals Monitoring Land Subsidence With The Combination of Persistent Scatterer Interferometry Techniques And Distributed Fiber Optic Sensing Techniques: A Case Study In Suzhou, China

2021 ◽  
Author(s):  
Hongwei Sang ◽  
Bin Shi ◽  
Dan Zhang ◽  
Suping Liu ◽  
Yi Lu
Keyword(s):  
Land Subsidence ◽  
Land Surface ◽  
Fiber Optic ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Persistent Scatterer Interferometry ◽  
Persistent Scatterer ◽  
Fiber Optic Sensing ◽  
Over Exploitation ◽  
Monitoring Technologies

Abstract Land subsidence is a global geo-hazard caused by various natural and human factors, and it directly threatens the safety of the environment and infrastructures. Investigating the mechanism of land subsidence is becoming more and more important. In this paper, we use the Persistent Scatterer Interferometry (PSI) technique combining the Distributed Fiber Optic Sensing (DFOS) technique to detect the spatial-temporal distributions of land subsidence and investigate the stratum deformation characteristics in Shengze, Suzhou. By analyzing Sentinel-1A date between 2017 and 2019 with the PSI technique and the deformation date derived by the DFOS technique, we conclude that the land surface deformations are mostly affected by the transitional exploitation of groundwater. The average Line-Of-Sight (LOS) deformation rate is mostly concentrated in -3 to 2.2 mm/yr, and a maximum subsidence rate of up to -16.9 mm/yr is observed in four industrial areas. Meanwhile, the DFOS-derived results reveal that the compression strata are mostly concentrated in 41.2-137.9 m depth, which is closely associated with the pore water pressure in the second confined aquifer. And it also reveals that the groundwater over-exploitation may be the significant triggering factor of the subsidence in the study area. The InSAR-derived results are also evaluated by the deformation time series obtained by the DFOS technique. The combination of those two new sensing and monitoring technologies enables us to highlight the large deformation area and reveal the mechanism of its subsidence, which is conducive to urban development, disaster risk management, and rational exploitation and management of groundwater in Suzhou.

Improved distributed fiber optic sensing system based on single-ended double-pulse input Brillouin scattering

2014 ◽  
Author(s):  
Tianying Chang ◽  
Ruijuan Yang ◽  
Yongliang Wang ◽  
David Y. Li ◽  
Lei Jia ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Brillouin Scattering ◽  
Double Pulse ◽  
Pulse Input ◽  
Sensing System ◽  
Fiber Optic Sensing

scholarly journals Monitoring Strategic Hydraulic Infrastructures by Brillouin Distributed Fiber Optic Sensors

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 188
Author(s):  
Manuel Bertulessi ◽  
Daniele Fabrizio Bignami ◽  
Ilaria Boschini ◽  
Marco Brunero ◽  
Maddalena Ferrario ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Strain Gauges ◽  
Mountain Valley ◽  
Concrete Members ◽  
Strain Monitoring ◽  
Hydropower Plants ◽  
Complex Structural ◽  
Monitoring Technologies

We present a case study of a Structural Health Monitoring (SHM) hybrid system based on Brillouin Distributed Fiber Optic Sensors (D-FOS), Vibrating Wire (VW) extensometers and temperature probes for an existing historical water penstock bridge positioned in a mountain valley in Valle d’Aosta Region, Northwestern Italy. We assessed Brillouin D-FOS performances for this kind of infrastructure, characterized by a complex structural layout and located in a harsh environment. A comparison with the more traditional strain monitoring technology offered by VW strain gauges was performed. The D-FOS strain cable has been bonded to the concrete members using a polyurethane-base adhesive, ensuring a rigid strain transfer. The raw data from all sensors are interpolated on a unique general timestamp with hourly resolution. Strain data from D-FOS and VW strain gauges are then corrected from temperature effects and compared. Considering the inherent differences between the two monitoring technologies, results show a good overall matching between strain time series collected by D-FOS and VW sensors. Brillouin D-FOS proves to be a good solution in terms of performance and economic investment for SHM systems on complex infrastructures such as hydropower plants, which involve extensive geometry combined with the need for detailed and continuous strain monitoring.

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