Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 11, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL098211
Keywords
reservoir landslide; fiber optic sensing; thermo-hydro-mechanical interactions; main driver; multi-physical evolution processes; extreme climate impacts
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Funding
- National Key Research and Development Program of China [2018YFC1505104]
- National Natural Science Foundation of China [42077235, 41722209]
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This study presents an innovative fiber-optic nerve system based on weak-reflection fiber Bragg grating to monitor a giant landslide in the Three Gorges Reservoir region in China. The system can measure and image the spatiotemporal distributions of temperature, moisture, and strain along boreholes in near real-time, providing unique insights into the subsurface thermo-hydro-mechanical link and the trigger of accelerated movements.
Reservoir landslides are typical geohazards with sophisticated thermo-hydro-mechanical interactions. However, direct observations of subsurface multi-physical processes in bank slopes remain rare. Herein we present the design, implementation and evaluation of an innovative fiber-optic nerve system based on weak-reflection fiber Bragg grating to monitor a giant landslide located in the Three Gorges Reservoir region, China. The system is capable of measuring and imaging spatiotemporal distributions of temperature, moisture and strain along boreholes in near real-time. Such visual profiles offer unique insights into the subsurface thermo-hydro-mechanical link between external conditions and geotechnical deformation, making it possible to decipher the substantial trigger of accelerated movements. Multi-physical responses at depths of interest also enable us to better understand the evolution mechanism of reservoir landslides. Fiber-optic nerve sensing can synergize with remote sensing and surface-based technologies to build a space-sky-ground-subsurface integrated monitoring system for landslides.
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