Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City
This study explores the influences of groundwater fluctuations in an urban area which lead to long-term ground surface subsidence using a time-series synthetic aperture radar interferometry (InSAR) technique. Unlike most prior studies that only focus on line-of-sight (LOS) deformation, assume neglig...
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Taylor & Francis Group
2024-12-01
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| Series: | Geomatics, Natural Hazards & Risk |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/19475705.2024.2375620 |
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| author | Ajay Saraswat Ya-Lun S. Tsai Jen-Yu Han |
| author_facet | Ajay Saraswat Ya-Lun S. Tsai Jen-Yu Han |
| author_sort | Ajay Saraswat |
| collection | DOAJ |
| description | This study explores the influences of groundwater fluctuations in an urban area which lead to long-term ground surface subsidence using a time-series synthetic aperture radar interferometry (InSAR) technique. Unlike most prior studies that only focus on line-of-sight (LOS) deformation, assume negligible horizontal movements, and quantify InSAR-groundwater relationship on a sparse temporal scale, this study utilized the Persistent Scatterers InSAR (PS-InSAR) technique to extract east-west and vertical displacement by decomposing Sentinel-1 ascending and descending datasets spanning from 2018 to 2022. Additionally, an approach was proposed to effectively quantify the relationship between changes in groundwater levels and vertical displacement on a daily basis. The results underwent robust validation against ground-based leveling surveys, revealing a satisfactory NRMSE of 1.06 mm/yr. Furthermore, founded on the estimated vertical displacement, three districts within Taipei City (e.g. Wugu, Xinzhuang, and Taishan) were identified as subsidence hotspots, with maximum vertical deformation rates reaching −11.77 mm/yr. Eventually, the correlation analysis and quantification between vertical displacement and daily groundwater data underscore long-term groundwater fluctuations as the primary cause of subsidence. These findings, derived from InSAR-based 2D displacements, have proven valuable in understanding groundwater-caused ground subsidence hazards in urban areas and empowering relevant stakeholders to set out corresponding adaptation and mitigation measures. |
| format | Article |
| id | doaj-art-e163c1b46e0a4797b97faa29d3e0542f |
| institution | Kabale University |
| issn | 1947-5705 1947-5713 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Taylor & Francis Group |
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| series | Geomatics, Natural Hazards & Risk |
| spelling | doaj-art-e163c1b46e0a4797b97faa29d3e0542f2024-12-12T18:11:17ZengTaylor & Francis GroupGeomatics, Natural Hazards & Risk1947-57051947-57132024-12-0115110.1080/19475705.2024.2375620Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei CityAjay Saraswat0Ya-Lun S. Tsai1Jen-Yu Han2Earth Observation and Remote Sensing Lab, Surveying and Geospatial Engineering Division, Department of Civil Engineering, National Taiwan University, Taipei, TaiwanEarth Observation and Remote Sensing Lab, Surveying and Geospatial Engineering Division, Department of Civil Engineering, National Taiwan University, Taipei, TaiwanCenter for Research on High Performance Remote Sensing and Urban Informatics, Surveying and Geospatial Engineering Division, Department of Civil Engineering, National Taiwan University, Taipei, TaiwanThis study explores the influences of groundwater fluctuations in an urban area which lead to long-term ground surface subsidence using a time-series synthetic aperture radar interferometry (InSAR) technique. Unlike most prior studies that only focus on line-of-sight (LOS) deformation, assume negligible horizontal movements, and quantify InSAR-groundwater relationship on a sparse temporal scale, this study utilized the Persistent Scatterers InSAR (PS-InSAR) technique to extract east-west and vertical displacement by decomposing Sentinel-1 ascending and descending datasets spanning from 2018 to 2022. Additionally, an approach was proposed to effectively quantify the relationship between changes in groundwater levels and vertical displacement on a daily basis. The results underwent robust validation against ground-based leveling surveys, revealing a satisfactory NRMSE of 1.06 mm/yr. Furthermore, founded on the estimated vertical displacement, three districts within Taipei City (e.g. Wugu, Xinzhuang, and Taishan) were identified as subsidence hotspots, with maximum vertical deformation rates reaching −11.77 mm/yr. Eventually, the correlation analysis and quantification between vertical displacement and daily groundwater data underscore long-term groundwater fluctuations as the primary cause of subsidence. These findings, derived from InSAR-based 2D displacements, have proven valuable in understanding groundwater-caused ground subsidence hazards in urban areas and empowering relevant stakeholders to set out corresponding adaptation and mitigation measures.https://www.tandfonline.com/doi/10.1080/19475705.2024.2375620Persistent scatterers InSAR (PS-InSAR)2D displacement analysissentinel-1Aurban land subsidence monitoringgeodetic leveling surveygroundwater well observation |
| spellingShingle | Ajay Saraswat Ya-Lun S. Tsai Jen-Yu Han Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City Geomatics, Natural Hazards & Risk Persistent scatterers InSAR (PS-InSAR) 2D displacement analysis sentinel-1A urban land subsidence monitoring geodetic leveling survey groundwater well observation |
| title | Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City |
| title_full | Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City |
| title_fullStr | Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City |
| title_full_unstemmed | Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City |
| title_short | Evaluation of groundwater-caused deformation patterns in a metropolitan area using time series InSAR and retrieval of vertical and east-west displacement: a case study in Taipei City |
| title_sort | evaluation of groundwater caused deformation patterns in a metropolitan area using time series insar and retrieval of vertical and east west displacement a case study in taipei city |
| topic | Persistent scatterers InSAR (PS-InSAR) 2D displacement analysis sentinel-1A urban land subsidence monitoring geodetic leveling survey groundwater well observation |
| url | https://www.tandfonline.com/doi/10.1080/19475705.2024.2375620 |
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