https://scholars.lib.ntu.edu.tw/handle/123456789/571647
標題: | The relationship between surface displacement and groundwater level change and its hydrogeological implications in an alluvial fan: Case study of the choshui river, taiwan | 作者: | Lu C.-Y JYR-CHING HU Chan Y.-C Su Y.-F Chang C.-H. |
關鍵字: | Compaction; Global positioning system; Groundwater; Landforms; Monitoring; Pore pressure; Pressure distribution; Pressure effects; Subsidence; Surface measurement; Time series analysis; Global Navigation Satellite Systems; Land surface change; Monitoring wells; Pore-water pressures; Precise leveling; Surface displacement; Temporal integration; Vertical surface; Groundwater resources | 公開日期: | 2020 | 卷: | 12 | 期: | 20 | 起(迄)頁: | 1-20 | 來源出版物: | Remote Sensing | 摘要: | Balancing the demand of groundwater resources and the mitigation of land subsidence is particularly important, yet challenging, in populated alluvial fan areas. In this study, we combine multiple monitoring data derived from Multi-Temporal InSAR (MTI), GNSS (Global Navigation Satellite System), precise leveling, groundwater level, and compaction monitoring wells, in order to analyze the relationship between surface displacement and groundwater level change within the alluvial fan of the Choshui River in Taiwan. Our combined time-series analyses suggest, in a yearly time scale, that groundwater level increases with the vertical surface displacement when the effect of pore water pressure dominates. Conversely, this relationship is negative when the effect of water-mass loading predominates over pore water pressure. However, the correlation between the vertical surface displacement and the groundwater level change is consistently positive over the time scale of two decades. It is interpreted that the alluvial fan sequence in the subsurface is not fully elastic, and compaction is greater than rebound in this process. These findings were not well reported and discussed by previous studies because of insufficient monitoring data and analyses. Understanding the combined effect of groundwater level change and vertical surface displacement is very helpful for management of land subsidence and usage of groundwater resources. The spatial and temporal integration of multi-sensors can be applied to overcome the limitations associated with the single technique and provides further insights into land surface changes, particularly in highly populated alluvial fan areas. ? 2020 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85092915708&doi=10.3390%2frs12203315&partnerID=40&md5=14ae4e39b095a815bba6a700035a6ef7 https://scholars.lib.ntu.edu.tw/handle/123456789/571647 |
ISSN: | 20724292 | DOI: | 10.3390/rs12203315 |
顯示於: | 地質科學系 |
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