Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan
Water saturation in the bedrock or colluvium is highly related to most landslide hazards, and rainfall is likely a crucial factor. The dynamic processes of onsite rock/soil mechanics could be revealed via monitoring using the electrical resistivity tomography (ERT) technique and Archie’s law. This s...
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Frontiers Media S.A.
2021-10-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.737271/full |
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| author | Wu-Nan Tsai Chien-Chih Chen Chien-Chih Chen Chih-Wen Chiang Pei-Yuan Chen Chih-Yu Kuo Chih-Yu Kuo Kuo-Lung Wang Meei-Ling Lin Rou-Fei Chen |
| author_facet | Wu-Nan Tsai Chien-Chih Chen Chien-Chih Chen Chih-Wen Chiang Pei-Yuan Chen Chih-Yu Kuo Chih-Yu Kuo Kuo-Lung Wang Meei-Ling Lin Rou-Fei Chen |
| author_sort | Wu-Nan Tsai |
| collection | DOAJ |
| description | Water saturation in the bedrock or colluvium is highly related to most landslide hazards, and rainfall is likely a crucial factor. The dynamic processes of onsite rock/soil mechanics could be revealed via monitoring using the electrical resistivity tomography (ERT) technique and Archie’s law. This study aims to investigate water saturation changes over time using time-lapse ERT images, providing a powerful method for monitoring landslide events. A fully automatic remote resistivity monitoring system was deployed to acquire hourly electrical resistivity data using a nontraditional hybrid array in the Lantai area of Yilan Taiping Mountain in Northeast Taiwan from 2019 to 2021. Six subzones in borehole ERT images were examined for the temporal and spatial resistivity variations, as well as possible pathways of the groundwater. Two representative cases of inverted electrical resistivity images varying with precipitation may be correlated with water saturation changes in the studied hillslope, implying the process of rainfall infiltration. Layers with decreased and increased electrical resistivity are also observed before sliding events. Accordingly, we suggest that high-frequency time-lapse ERT monitoring could play a crucial role in landslide early warning. |
| first_indexed | 2024-12-16T06:40:23Z |
| format | Article |
| id | doaj.art-681d9035fddd4633af3e67ed40a0d8fc |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-16T06:40:23Z |
| publishDate | 2021-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-681d9035fddd4633af3e67ed40a0d8fc2022-12-21T22:40:42ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-10-01910.3389/feart.2021.737271737271Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast TaiwanWu-Nan Tsai0Chien-Chih Chen1Chien-Chih Chen2Chih-Wen Chiang3Pei-Yuan Chen4Chih-Yu Kuo5Chih-Yu Kuo6Kuo-Lung Wang7Meei-Ling Lin8Rou-Fei Chen9Department of Earth Sciences, National Central University, Taoyuan, TaiwanDepartment of Earth Sciences, National Central University, Taoyuan, TaiwanEarthquake-Disaster and Risk Evaluation and Management Center, National Central University, Taoyuan, TaiwanInstitute of Earth Sciences, National Taiwan Ocean University, Keelung, TaiwanGraduate Institute of Hydrologic and Oceanic Sciences, National Central University, Taoyuan, TaiwanResearch Center for Applied Sciences, Academia Sinica, Taipei, TaiwanDepartment of Civil Engineering, National Taiwan University, Taipei, TaiwanDepartment of Civil Engineering, National Chi Nan University, Nantou, TaiwanDepartment of Civil Engineering, National Taiwan University, Taipei, TaiwanDepartment of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, TaiwanWater saturation in the bedrock or colluvium is highly related to most landslide hazards, and rainfall is likely a crucial factor. The dynamic processes of onsite rock/soil mechanics could be revealed via monitoring using the electrical resistivity tomography (ERT) technique and Archie’s law. This study aims to investigate water saturation changes over time using time-lapse ERT images, providing a powerful method for monitoring landslide events. A fully automatic remote resistivity monitoring system was deployed to acquire hourly electrical resistivity data using a nontraditional hybrid array in the Lantai area of Yilan Taiping Mountain in Northeast Taiwan from 2019 to 2021. Six subzones in borehole ERT images were examined for the temporal and spatial resistivity variations, as well as possible pathways of the groundwater. Two representative cases of inverted electrical resistivity images varying with precipitation may be correlated with water saturation changes in the studied hillslope, implying the process of rainfall infiltration. Layers with decreased and increased electrical resistivity are also observed before sliding events. Accordingly, we suggest that high-frequency time-lapse ERT monitoring could play a crucial role in landslide early warning.https://www.frontiersin.org/articles/10.3389/feart.2021.737271/fulltime-lapse electrical resistivity tomographyrainfall infiltrationwater saturationlandslidehazard mitigation |
| spellingShingle | Wu-Nan Tsai Chien-Chih Chen Chien-Chih Chen Chih-Wen Chiang Pei-Yuan Chen Chih-Yu Kuo Chih-Yu Kuo Kuo-Lung Wang Meei-Ling Lin Rou-Fei Chen Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan Frontiers in Earth Science time-lapse electrical resistivity tomography rainfall infiltration water saturation landslide hazard mitigation |
| title | Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan |
| title_full | Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan |
| title_fullStr | Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan |
| title_full_unstemmed | Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan |
| title_short | Electrical Resistivity Tomography (ERT) Monitoring for Landslides: Case Study in the Lantai Area, Yilan Taiping Mountain, Northeast Taiwan |
| title_sort | electrical resistivity tomography ert monitoring for landslides case study in the lantai area yilan taiping mountain northeast taiwan |
| topic | time-lapse electrical resistivity tomography rainfall infiltration water saturation landslide hazard mitigation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.737271/full |
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