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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
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2 Literature review Motivation Methodology Results Future work Outline
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3 Literature review Steep declines in water level were accompanied by high rates of land subsidence. (A.M. Wilson, S. Gorelick. 1996)
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4 Motivation The Choshui River alluvial fan consists of sand, silt and clay. (Hung Wei Jia et al. 2009)
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5 Model MODFLOW-2000 (Version 1.19.01, March 25 2010) SUB (Subsidence and Aquifer-System Compaction) Package
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6 Governing equation
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7 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.
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8 Layers 1, 2 and 3 Initial Head = 0 1000 2000 STORAGE COEFFICIENT=0.1 STORAGE COEFFICIENT=6.56x10 –5 STORAGE COEFFICIENT=2.62x10 –4 Column Row 12345678910 9 8 7 6 5 4 3 2 1 0 -100 -150 -350 K = 20 [m/day] Vertical leakance value = 3x10 –6 /m T = 1000, 0.5 [m 2 /day] Vertical leakance value = 3x10 –6 /m T = 1000 [m 2 /day] 100 50 200 Layer 1 Layer 2 Layer 3 Conceptual model
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9 T( transmissivity )=1000 [m 2 /day] Conceptual model (Layer 2) T( transmissivity )=0.5 [m 2 /day]
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10 123456789 1 2 3 4 5 6 7 8 9 Discharge area (Layer 1) Recharge area (Layer 1) 02 KILOMETERS Pumping well (Layer 3) Conceptual model
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11 Results (Head) Layer 1
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12 Layer 2 Results (Head)
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13 Layer 3 Results (Head)
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14 Results Subsidence
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15 Future work Data collection Model calibration and verification
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16 Thanks for your attention
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