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Using SUB model to predict long-term land subsidence in Yunlin and Chiayi areas

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

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Using SUB model to predict long-term land subsidence in Yunlin and Chiayi areas

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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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