Numerical simulations of oil contaminant transport in sandy coastal aquifers
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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


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Outline coastal aquifers

  • Motivation

  • Objectives

  • Methodology

  • Test example

  • Future work


Motivation
Motivation coastal aquifers

  • 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.


Numerical simulations of oil contaminant transport in sandy coastal aquifers

彭薩科拉海灘 coastal aquifers(Pensacola)


Objectives
Objectives coastal aquifers

  • 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 coastal aquifers-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.


Numerical simulations of oil contaminant transport in sandy coastal aquifers


Numerical simulations of oil contaminant transport in sandy coastal aquifers

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


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Test example coastal aquifers

Pressure head

= 85m

Variable boundary condition

Pressure head

= 84m

100 m

400 m

Impermeable bottom


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Slope coastal aquifers

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


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Total head coastal aquifers

Beach slope = 0.2

Beach slope = 0.3


Numerical simulations of oil contaminant transport in sandy coastal aquifers

12day coastal aquifers

Beach slope = 0.2

Beach slope = 0.3


Numerical simulations of oil contaminant transport in sandy coastal aquifers

27day coastal aquifers

Beach slope = 0.2

Beach slope = 0.3


Numerical simulations of oil contaminant transport in sandy coastal aquifers

46day coastal aquifers

Beach slope = 0.2

Beach slope = 0.3


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Recharge coastal aquifers

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)


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Total head coastal aquifers

No rainfall

I= 0.01m/day


Numerical simulations of oil contaminant transport in sandy coastal aquifers

27day coastal aquifers

No rainfall

I= 0.01m/day


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Pumping well coastal aquifers

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)


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Total head coastal aquifers

no pumping well

pumping well


Numerical simulations of oil contaminant transport in sandy coastal aquifers

27day coastal aquifers

no pumping well

pumping well


Numerical simulations of oil contaminant transport in sandy coastal aquifers

46day coastal aquifers

no pumping well

pumping well


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Future work coastal aquifers


Numerical simulations of oil contaminant transport in sandy coastal aquifers

Thanks for your attention coastal aquifers