Gravity estimation of groundwater mass balance of sandy aquifers in the land subsidence-hit region of Yunlin County, Taiwan

Chen, Kuan‐Hung; Hwang, Cheinway; Tanaka, Yoshiyuki; Chang, Ping-Yu

doi:10.1016/j.enggeo.2023.107021

Cited by 6 publications

(2 citation statements)

References 36 publications

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“…Moreover, there is a variety of dynamics associated with land subsidence that require further study. The dynamics include the change of porosity and permeability due to soil compaction [25], subsidence in sandy aquifers [26][27][28], and the integration of subsidence and salinity intrusion in unconfined aquifers [29].…”

Section: Advances In Land Subsidence Studies In Aquifersmentioning

confidence: 99%

Land Subsidence Due to Groundwater Exploitation in Unconfined Aquifers: Experimental and Numerical Assessment with Computational Fluid Dynamics

Chalá,

Quiñones-Bolaños,

Mehrvar

2024

Water

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Land subsidence is a global challenge that enhances the vulnerability of aquifers where climate change and driving forces are occurring simultaneously. To comprehensively analyze this issue, integrated modeling tools are essential. This study advances the simulation of subsidence using Computational Fluid Dynamics (CFD); it assessed the effects of exploitation and recharge of groundwater on the vertical displacement of coarse and fine sands in a laboratory-scale aquifer. A model was developed by integrating the Navier–Stokes equations to study the groundwater flow and Terzaghi’s law for the vertical displacement of sands. The boundary conditions used were Dirichlet based on the changes in the hydraulic head over time. The specific storage coefficient was used to calibrate the model. The findings confirmed that subsidence occurs at slower rates in soil with fine sands with average particle diameters of 0.39 mm than in coarse sands with average particle diameters of 0.67 mm. The maximum discrepancy between the experimental and the numerical reaffirms that CFD platforms can be used to simulate subsidence dynamics and potentially allow the simultaneous simulation of other dynamics. Concluding remarks and recommendations are highlighted considering the up-to-date advances and future work to improve the research on subsidence in unconfined aquifers.

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Section: Advances In Land Subsidence Studies In Aquifersmentioning

confidence: 99%

Land Subsidence Due to Groundwater Exploitation in Unconfined Aquifers: Experimental and Numerical Assessment with Computational Fluid Dynamics

Chalá,

Quiñones-Bolaños,

Mehrvar

2024

Water

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“…Faults serve as pathways and channels for water movement, increasing the potential for infiltration. Meanwhile, the distribution of fractures as pathways and for infiltration [21], [22].…”

Section: Complete Bouguer Anomaly (Cba)mentioning

confidence: 99%

Geological Structure Model for Recharge Area in Patuha Geothermal Field

Indriani,

Anjasmara,

Utama

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Geothermal sustainability requires geological structure analysis using gravity methods for groundwater management. Geological structure analysis reviews fault data. Geological structure as a pathway for fluid movement for groundwater management in the research area, especially the Patuha Geothermal Field, West Java. This study uses global gravity model, terrestrial gravity, DEM, and geological data. The gravity method applied in this research involves calculations for latitude correction, free air correction, bouguer correction and terrain correction. The final results of this research are free air anomaly, complete Bouguer anomaly, and model evaluation (MRSE, MRE, and MAE). Free air anomaly results from free air correction of global gravity model data. DEM topography analyzes free air anomaly. The FAA data model evaluated RMSE at 1.27, MRE at 0.004, and MAE at 0.83. 138.02–280.26 mgal is the FAA range. The research area’s elevation range is 836–2431 m. Topography and free air anomaly correlate 0.75. Positive high connection. Mountains and plateaus may have positive gravity anomalies. Free air, bouguer, terrain, and CBA are applied to global gravity model data. The CBA model evaluation indicates quality. RMSE is 1.47, MRE is 0.012, and MAE is 1.11. CBA fluctuation implies fault spread. Faults serve as water flow conduits and channels, increasing the risk of infiltration. Meanwhile, cracks are being distributed as conduits and for infiltration. This research forms the basis for developing and increasing geothermal production so that further studies are needed regarding the influence of geological structures for reservoir in geothermal areas.

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Evaluating the Safety and Control Scheme of Coastal Railway Using Land Subsidence Coupling Model

Yang,

Jia,

Yang

et al. 2023

KSCE J Civ Eng

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Gravity estimation of groundwater mass balance of sandy aquifers in the land subsidence-hit region of Yunlin County, Taiwan

Cited by 6 publications

References 36 publications

Land Subsidence Due to Groundwater Exploitation in Unconfined Aquifers: Experimental and Numerical Assessment with Computational Fluid Dynamics

Land Subsidence Due to Groundwater Exploitation in Unconfined Aquifers: Experimental and Numerical Assessment with Computational Fluid Dynamics

Geological Structure Model for Recharge Area in Patuha Geothermal Field

Evaluating the Safety and Control Scheme of Coastal Railway Using Land Subsidence Coupling Model

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