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Numerical simulations of oil contaminant transport in sandy coastal aquifers

Explore oil spill impacts on sandy coastal aquifers using numerical simulations. Investigate oil penetration, groundwater pollution, & influencing factors. Methodology involves HYDROGEOCHEM-2D model. Test examples illustrate fluid flow, chemical transport, and reactions through media.

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Numerical simulations of oil contaminant transport in sandy coastal aquifers

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  1. Numerical simulations of oil contaminant transport in sandy coastal aquifers Presenter：Yi-Ming Wei Adviser：Chuen-Fa Ni Date：2011/04/21

  2. Outline • Motivation • Objectives • Methodology • Test example • Future work

  3. Motivation • With the increasing developments of tourist and industrial estates in coastal area,different sources of contaminants can be discharged into the sea. • Marine pollution：Oil spills happen when people make mistakes or are careless andcause an oil tanker to leak oil into theocean.

  4. 彭薩科拉海灘(Pensacola)

  5. Objectives • when a petroleum spill reaches the beaches, there may be deeper penetration in the soil, which depends on sand grain size, so causing serious damages to the ecosystem. • how much and how deep oil is transported into the beaches. • Whether oil polluted groundwater or not. (3)Other factor of influence oil transportation ： tidal、wave、 beach slope、pumping well、recharge water …

  6. Methodology-HYDROGEOCHEM-2D • Acoupled model of fluid flow, thermal transport, and • HYDROGEOCHEMical transport through saturated- • unsaturated media. • Deal with equilibrium and kinetic reaction in terms • of reaction networks. • Incorporate the effect of precipitation /dissolution • on the change of pore size, hydraulic conductivity, • and diffusion/dispersion.

  7. Flow Equations

  8. Reactive Chemical Transport Equations The rate of mass accumulation The net rate of mass flux due to advection The net mass flux due to dispersion and diffusion, The source/sink term corresponding to artificial injection and/or withdrawal The rate of mass production and reduction due to chemical reactions and radioactive decay

  9. Test example Pressure head = 85m Variable boundary condition Pressure head = 84m 100 m 400 m Impermeable bottom

  10. Slope 1.0 mole/liter ( C6H6) Beach slope = 0.2、0.3 Pressure head = 85m Pressure head = 84m No rainfall 100 m 400 m Impermeable bottom

  11. Total head Beach slope = 0.2 Beach slope = 0.3

  12. 12day Beach slope = 0.2 Beach slope = 0.3

  13. 27day Beach slope = 0.2 Beach slope = 0.3

  14. 46day Beach slope = 0.2 Beach slope = 0.3

  15. Recharge I= 0.01m/day Beach slope = 0.2 Pressure head = 85m Pressure head = 84m 100 m 400 m Impermeable bottom 1.0 mole/liter ( C6H6)

  16. Total head No rainfall I= 0.01m/day

  17. 27day No rainfall I= 0.01m/day

  18. Pumping well 1.0 mole/liter ( C6H6) Beach slope = 0.2 Pressure head = 85m Pressure head = 84m No rainfall 100 m 400 m Impermeable bottom -20 m2/day(抽水)

  19. Total head no pumping well pumping well

  20. 27day no pumping well pumping well

  21. 46day no pumping well pumping well

  22. Future work

  23. Thanks for your attention

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