AI SearchEvaluation of landslides triggered by groundwater fluctuations in mountainous areas by using 3D groundwater modeling : a case study of Doi Chang village, Chiang Rai, Thailand
Call Number: AIT Thesis no.GE-24-04 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. GE-24-04Publication details: Pathum Thani, Thailand : Asian Institute of Technology, 2025Description: 283 leaves : ill.+ 1 online resourceSubject(s): Online resources: Dissertation note: Thesis (M. Sc.) - Asian Institute of Technology, 2025 Summary: Groundwater fluctuations are a major factor in slope instability and landslide initiation, especially in mountainous terrains with complex hydrogeological settings. However, the mechanisms by which fluctuating groundwater levels influence slope failure are not yet fully understood. This study aims to investigate the relationship between groundwater fluctuations and landslide occurrence by applying 3D geological modeling and groundwater modeling. The research focuses on a case study in a landslide-prone area in Doi Chang Village, Chiang Rai Province, Thailand.A detailed geological and hydrogeological investigation incorporated field mapping, borehole logging, electrical resistivity imaging, and soil laboratory testing. Based on these datasets, a 3D Engineering Geological Model was constructed to represent the subsurface conditions accurately. These models were then used to develop a numerical groundwater flow model using the MODFLOW model to simulate groundwater responses under variable rainfall recharge scenarios.The results demonstrate a strong correlation between rising groundwater levels and increased pore water pressure within the shallow colluvial layer, reducing effective stress and potential slope failure. Model calibration and validation against observed groundwater level data confirmed the reliability of the simulation. Prediction analyses further revealed that a 20% increase in rainfall could elevate groundwater to critical thresholds. In contrast, scenarios with subsurface drainage showed significant groundwater drawdown, indicating their effectiveness in mitigating landslide risk.This study contributes to a better understanding of groundwater-induced slope failure. It highlights the utility of integrating 3D geological modeling with groundwater model simulations in landslide hazard assessment and mitigation planning.
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A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geotechnical and Earth Resources Engineering
Thesis (M. Sc.) - Asian Institute of Technology, 2025
Groundwater fluctuations are a major factor in slope instability and landslide initiation, especially in mountainous terrains with complex hydrogeological settings. However, the mechanisms by which fluctuating groundwater levels influence slope failure are not yet fully understood. This study aims to investigate the relationship between groundwater fluctuations and landslide occurrence by applying 3D geological modeling and groundwater modeling. The research focuses on a case study in a landslide-prone area in Doi Chang Village, Chiang Rai Province, Thailand.A detailed geological and hydrogeological investigation incorporated field mapping, borehole logging, electrical resistivity imaging, and soil laboratory testing. Based on these datasets, a 3D Engineering Geological Model was constructed to represent the subsurface conditions accurately. These models were then used to develop a numerical groundwater flow model using the MODFLOW model to simulate groundwater responses under variable rainfall recharge scenarios.The results demonstrate a strong correlation between rising groundwater levels and increased pore water pressure within the shallow colluvial layer, reducing effective stress and potential slope failure. Model calibration and validation against observed groundwater level data confirmed the reliability of the simulation. Prediction analyses further revealed that a 20% increase in rainfall could elevate groundwater to critical thresholds. In contrast, scenarios with subsurface drainage showed significant groundwater drawdown, indicating their effectiveness in mitigating landslide risk.This study contributes to a better understanding of groundwater-induced slope failure. It highlights the utility of integrating 3D geological modeling with groundwater model simulations in landslide hazard assessment and mitigation planning.
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