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Source Terms

Source Terms. Constant Concentration Injection Well Recharge. May be introduced at the boundary or in the interior of the model. Q. Constant Concentration (Z&B, p. 283). c s. e.g., NAPL source area. at boundary. Injection Well. Qc s. well. Recharge. R, c s.

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Source Terms

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  1. Source Terms • Constant Concentration • Injection Well • Recharge May be introduced at the boundary or in the interior of the model

  2. Q Constant Concentration (Z&B, p. 283) cs e.g., NAPL source area at boundary

  3. Injection Well Qcs well

  4. Recharge R, cs Mass Flux = R (x y)cs

  5. Problem Set #3 Source Terms and Chemical Reactions • Constant Concentration • Injection Well • Recharge • retardation • 1st order decay

  6. Confined layers Problem Set #3 Two Layers This screen shows a constant concentration source. Contours of head are also shown.

  7. Note the water table Flow field for an unconfined upper layer with areal recharge and a recharge source cell.

  8. Problem Set #3 Parts 1 and 2: Produce breakthrough curves under different assumptions about the source term and chemical reactions.

  9. Numerical error caused by high Peclet number Problem Set #3 – Part 3 - Remediation TVD Solution

  10. Central Finite Difference Solution 100 m grid spacing

  11. Numerical error caused by high Peclet number Problem Set #3 – Part 3 - Remediation TVD Solution

  12. Cr < 1 Courant Number Pe < 4 Peclet Number

  13. 50 m grid Pumping well is represented by 4 nodes

  14. TVD solution 50 m grid spacing upper left node in the pumping complex Peclet number = 2.5 100 m grid spacing Peclet number = 5

  15. TVD Solution 50 m grid – near center of pumping complex 100 m grid

  16. TVD Solution 50 m grid – upper left node of pumping complex 55 50 100 m grid Central difference 50 m grid – near center of pumping complex 60 100 m grid 50

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