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Numerical simulations of oil contaminant transport in sandy coastal aquifers. Presenter : Yi-Ming Wei Adviser : Chuen-Fa Ni Date : 2011/04/21. Outline. Motivation Objectives Methodology Test example Future work. Motivation. With the increasing developments of tourist and industrial

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numerical simulations of oil contaminant transport in sandy coastal aquifers

Numerical simulations of oil contaminant transport in sandy coastal aquifers

Presenter:Yi-Ming Wei

Adviser:Chuen-Fa Ni

Date:2011/04/21

slide2

Outline

  • Motivation
  • Objectives
  • Methodology
  • Test example
  • Future work
motivation
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.

objectives
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 …

methodology hydrogeochem 2d
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.
slide9

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

slide10

Test example

Pressure head

= 85m

Variable boundary condition

Pressure head

= 84m

100 m

400 m

Impermeable bottom

slide11

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

slide12

Total head

Beach slope = 0.2

Beach slope = 0.3

slide13

12day

Beach slope = 0.2

Beach slope = 0.3

slide14

27day

Beach slope = 0.2

Beach slope = 0.3

slide15

46day

Beach slope = 0.2

Beach slope = 0.3

slide16

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)

slide17

Total head

No rainfall

I= 0.01m/day

slide18

27day

No rainfall

I= 0.01m/day

slide19

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)

slide20

Total head

no pumping well

pumping well

slide21

27day

no pumping well

pumping well

slide22

46day

no pumping well

pumping well

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