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Modeling Long-term Land Subsidence in Yunlin and Chiayi Areas Using SUB Model

This study presented by Chiou-Shiang Hung on 2010/10/07 explores the prediction of land subsidence in Yunlin and Chiayi areas using the MODFLOW-2000 SUB package model. The research includes literature review, motivation behind the study, methodology, results, and future work. The conceptual model consists of three layers with different hydraulic properties, depicting variations in subsidence and hydraulic conductivity. The study emphasizes the importance of monitoring water levels for understanding land subsidence phenomena in the region.

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Modeling Long-term Land Subsidence in Yunlin and Chiayi Areas Using SUB Model

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  1. Using SUB model to predict long-term land subsidence in Yunlin and Chiayi areas Presenter : Chiou-Shiang Hung Adviser : Chuen-Fa Ni Date : 2010/10/07

  2. Outline • Literature review • Motivation • Methodology • Results • Future work

  3. Literaturereview • Steep declines in water level were accompanied by high rates of land subsidence. (A.M. Wilson, S. Gorelick. 1996)

  4. Motivation • TheChoshui River alluvial fan consists of sand, silt and clay. (Hung Wei Jiaet al. 2009)

  5. Model • MODFLOW-2000(Version 1.19.01, March 25 2010) • SUB (Subsidence and Aquifer-SystemCompaction) Package

  6. Governing equation

  7. Governing equation Kv is the vertical hydraulic conductivity. h is the hydraulic head. Ssk is the specific storage. t is time △b is the change in thickness. Sskv is the inelastic specific storage. Sske is the elastic specific storage. bo is the initial thickness. △h is the change in hydraulic head.

  8. Conceptual model 1000 2000 Layers 1, 2 and 3 Initial Head = 0 Column 1 2 3 4 5 6 7 8 9 10 10 STORAGE COEFFICIENT=0.1 9 Layer 1 8 Row 7 6 5 Layer 2 4 3 0 STORAGE COEFFICIENT=6.56x10–5 2 1 -100 Layer 3 100 K = 20 [m/day] STORAGE COEFFICIENT=2.62x10–4 Vertical leakance value = 3x10–6/m 50 T = 1000, 0.5 [m2/day] -150 Vertical leakance value = 3x10–6/m 200 T = 1000 [m2/day] -350

  9. Conceptual model (Layer 2) T(transmissivity)=1000 [m2/day] T(transmissivity)=0.5 [m2/day]

  10. Conceptual model 1 2 3 4 5 6 7 8 9 10 10 9 8 Discharge area (Layer 1) 7 Recharge area (Layer 1) 6 Pumping well (Layer 3) 5 4 3 2 1 0 2 KILOMETERS

  11. Results (Head) Layer 1

  12. Results (Head) Layer 2

  13. Results (Head) Layer 3

  14. Results Subsidence

  15. Future work • Data collection • Model calibration and verification

  16. Thanks for your attention

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