Source Terms Constant Concentration Injection Well Recharge May be introduced at the boundary or in...
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Source Terms
• Constant Concentration
• Injection Well
• Recharge
May be introduced at the boundary or inthe interior of the model
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Q
Constant Concentration(Z&B, p. 283)
cs
at boundary
e.g., NAPL source area
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Injection Well
Qcs
well
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Recharge
R, cs
Mass Flux = R (x y) cs
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Problem Set #3Source Terms and Chemical Reactions
• Constant Concentration
• Injection Well
• Recharge
• retardation• 1st order decay
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Problem Set #3Two Layers
This screen shows aconstant concentrationsource. Contours ofhead are also shown.
Confined layers
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Note the water table
Flow field for anunconfined upper layerwith areal recharge anda recharge source cell.
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Problem Set #3
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Parts 1 and 2: Producebreakthrough curves underdifferent assumptions aboutthe source term and chemicalreactions.
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Problem Set #3 – Part 3 - Remediation
TVD Solution
Numerical error causedby high Peclet number
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Concentration vs. Time at pumping well
Central Finite Difference Solution
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Problem Set #3 – Part 3 - Remediation
TVD Solution
Numerical error causedby high Peclet number
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Courant Numberx
tvCr
Cr < 1
Peclet Numberx
D
xvPe
Pe < 4
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Pumping well isrepresented by 4 nodes
50 m grid
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100 m grid spacingPeclet number = 5
50 m grid spacingupper left node in the pumping complexPeclet number = 2.5
TVD solution
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100 m grid 50 m grid – near centerof pumping compex
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TVD Solution