Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan
Study region: The Ailiao-Laonong river basin in the northern Pingtung Plain, Taiwan. Study focus: Probing groundwater in the Pingtung Plain is essential because of water shortages and rising water demand. The feasibility of artificial groundwater recharge has been investigated through seismic veloci...
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| Materialtyp: | Artikel |
| Språk: | English |
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Elsevier
2025-04-01
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| Serie: | Journal of Hydrology: Regional Studies |
| Ämnen: | |
| Länkar: | http://www.sciencedirect.com/science/article/pii/S2214581825000916 |
| _version_ | 1826550566170394624 |
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| author | Tzu-Yi Lien Emmy Tsui-Yu Chang Hou-Sheng Cheng Ta-Kang Yeh |
| author_facet | Tzu-Yi Lien Emmy Tsui-Yu Chang Hou-Sheng Cheng Ta-Kang Yeh |
| author_sort | Tzu-Yi Lien |
| collection | DOAJ |
| description | Study region: The Ailiao-Laonong river basin in the northern Pingtung Plain, Taiwan. Study focus: Probing groundwater in the Pingtung Plain is essential because of water shortages and rising water demand. The feasibility of artificial groundwater recharge has been investigated through seismic velocity variations. This study employed an innovative and cost-effective seismological approach to examine the responses of river and groundwater recharge, and to evaluate recharge constructions associated with a dredging project conducted in southern Taiwan in 2023. Seismic velocity changes (dv/v) were determined from four years of continuous seismic data applying seismic interferometric analysis and cross-correlation functions (CCFs) between seismic stations to reconstruct an ambient seismic wavefield. Uneven coherence responses along the causal and acausal axes of the CCFs can be used to determine the direction of signal propagation within the wavefield. New hydrological insights for the region: We firstly show the temporal alteration of CCF responses along the direction of station pairs across rivers. Larger response amplitudes of causal and acausal of the CCFs indicated the ambient noise sources are aligned with groundwater transport directions in the Ailiao-Laonong basin. Seismic pairs across the Laonong River exhibited flow direction changes during the rainy season (June to September), revealing groundwater and river water exchanges in this area. Amplified source signals present the enhancing recharge from the north bank of Ailiao Creek during typhoon season. These findings suggest that the optimal period for groundwater recharge is from June to September, with construction completion ideally by June. Results show that during the dry season, the primary source of groundwater recharge is from the east mountain, whereas during the wet season, the recharge source is predominantly from the north. This study demonstrates the alternating process of recharging and drainage between groundwater and river water levels. |
| first_indexed | 2025-03-14T06:39:22Z |
| format | Article |
| id | doaj.art-eb9d4b380f28488c9bd86a3eac4ca4f3 |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2025-03-14T06:39:22Z |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-eb9d4b380f28488c9bd86a3eac4ca4f32025-03-05T05:23:32ZengElsevierJournal of Hydrology: Regional Studies2214-58182025-04-0158102267Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern TaiwanTzu-Yi Lien0Emmy Tsui-Yu Chang1Hou-Sheng Cheng2Ta-Kang Yeh3Department of Real Estate and Built Environment, National Taipei University, Taiwan; Corresponding author.Institute of Oceanography, National Taiwan University, TaiwanInstitute of Oceanography, National Taiwan University, TaiwanDepartment of Real Estate and Built Environment, National Taipei University, TaiwanStudy region: The Ailiao-Laonong river basin in the northern Pingtung Plain, Taiwan. Study focus: Probing groundwater in the Pingtung Plain is essential because of water shortages and rising water demand. The feasibility of artificial groundwater recharge has been investigated through seismic velocity variations. This study employed an innovative and cost-effective seismological approach to examine the responses of river and groundwater recharge, and to evaluate recharge constructions associated with a dredging project conducted in southern Taiwan in 2023. Seismic velocity changes (dv/v) were determined from four years of continuous seismic data applying seismic interferometric analysis and cross-correlation functions (CCFs) between seismic stations to reconstruct an ambient seismic wavefield. Uneven coherence responses along the causal and acausal axes of the CCFs can be used to determine the direction of signal propagation within the wavefield. New hydrological insights for the region: We firstly show the temporal alteration of CCF responses along the direction of station pairs across rivers. Larger response amplitudes of causal and acausal of the CCFs indicated the ambient noise sources are aligned with groundwater transport directions in the Ailiao-Laonong basin. Seismic pairs across the Laonong River exhibited flow direction changes during the rainy season (June to September), revealing groundwater and river water exchanges in this area. Amplified source signals present the enhancing recharge from the north bank of Ailiao Creek during typhoon season. These findings suggest that the optimal period for groundwater recharge is from June to September, with construction completion ideally by June. Results show that during the dry season, the primary source of groundwater recharge is from the east mountain, whereas during the wet season, the recharge source is predominantly from the north. This study demonstrates the alternating process of recharging and drainage between groundwater and river water levels.http://www.sciencedirect.com/science/article/pii/S2214581825000916Groundwater flow directionRiver groundwater exchangeGroundwater rechargeRiver dredgingSeismic velocity |
| spellingShingle | Tzu-Yi Lien Emmy Tsui-Yu Chang Hou-Sheng Cheng Ta-Kang Yeh Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan Journal of Hydrology: Regional Studies Groundwater flow direction River groundwater exchange Groundwater recharge River dredging Seismic velocity |
| title | Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan |
| title_full | Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan |
| title_fullStr | Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan |
| title_full_unstemmed | Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan |
| title_short | Unveiling river-groundwater interactions through time-variable seismic velocity in northern Pingtung Plain, southern Taiwan |
| title_sort | unveiling river groundwater interactions through time variable seismic velocity in northern pingtung plain southern taiwan |
| topic | Groundwater flow direction River groundwater exchange Groundwater recharge River dredging Seismic velocity |
| url | http://www.sciencedirect.com/science/article/pii/S2214581825000916 |
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