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.

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.

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.

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

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 LAND SUBSIDENCE MONITORING USING PS-InSAR TECHNIQUE FOR L-BAND SAR DATA

2016 ◽  
Vol XLI-B7 ◽  
pp. 995-997 ◽  
Author(s):  
S. Thapa ◽  
R. S. Chatterjee ◽  
K. B. Singh ◽  
D. Kumar
Keyword(s):  
Time Series ◽  
Land Subsidence ◽  
Land Surface ◽  
Surface Deformation ◽  
Underground Mining ◽  
Ground Surface ◽  
Sar Interferometry ◽  
Persistent Scatterer Interferometry ◽  
Long Time ◽  
Subsidence Monitoring

Differential SAR-Interferometry (D-InSAR) is one of the potential source to measure land surface motion induced due to underground coal mining. However, this technique has many limitation such as atmospheric in homogeneities, spatial de-correlation, and temporal decorrelation. Persistent Scatterer Interferometry synthetic aperture radar (PS-InSAR) belongs to a family of time series InSAR technique, which utilizes the properties of some of the stable natural and anthropogenic targets which remain coherent over long time period. In this study PS-InSAR technique has been used to monitor land subsidence over selected location of Jharia Coal field which has been correlated with the ground levelling measurement. This time series deformation observed using PS InSAR helped us to understand the nature of the ground surface deformation due to underground mining activity.

scholarly journals Is There Deep-Seated Subsidence in the Houston-Galveston Area?

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Jiangbo Yu ◽  
Guoquan Wang ◽  
Timothy J. Kearns ◽  
Linqiang Yang
Keyword(s):  
Land Subsidence ◽  
Groundwater Level ◽  
Land Surface ◽  
The Past ◽  
Subsidence Rate ◽  
Different Depths ◽  
Subsidence Monitoring ◽  
Near Future ◽  
Land Subsidence Rate

Long-term continuous groundwater level and land subsidence monitoring in the Houston-Galveston area indicates that, during the past two decades (1993–2012), the groundwater head has been increasing and the overall land subsidence rate has been decreasing. Assuming that the hydraulic head in the aquifer will reach or exceed the preconsolidation level in the near future, will subsidence in the Houston-Galveston area eventually cease? The key to answer this question is to identify if there is deep-seated subsidence in this area. This study investigated the recent subsidence observed at different depths in the Houston-Galveston area. The subsidence was recorded by using 13 borehole extensometers and 76 GPS antennas. Four of the GPS antennas are mounted on the deep-anchored inner pipes of borehole extensometers. We conclude that recent subsidence (1993–2012) in the Houston-Galveston area was dominated by the compaction of sediments within 600 m below the land surface. Depending on the location of specific sites, the compaction occurred within the Chicot aquifer and part or all of the Evangeline aquifer. No measurable compaction was observed within the Jasper aquifer or within deeper strata. Deep-seated subsidence is not likely occurring in the Houston-Galveston area.

Sign in / Sign up

Export Citation Format

Share Document