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Groundwater pumping to remediate groundwater pollutionPowerPoint Presentation

Groundwater pumping to remediate groundwater pollution

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Groundwater pumping to remediate groundwater pollution

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Groundwater pumping to remediate groundwater pollution

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Groundwater pumping to remediate groundwater pollution

March 5, 2002

- 1) Squares
- 2) FieldTrip: McClellan
- 3) Finite Element Modeling

- Oxford Dictionary says
- “a geometric figure with four equal sites and four right angles”

- Units within a flow net are curvilinear figures…
- In certain cases, squares will be formed
- Constant head boundary…

- No flow crosses the boundary of a flowline !
- If interval between equipotential lines and interval between flowlines is constant, then volume of water within each curvilinear unit is the same…

- Flowlines are perpendicular to equipotential lines
- One way to assume that Q’s are equal is to construct the flownet with curvilinear squares
- Streamlines are perpendicular to constant head boundaries
- Equipotential lines are perpendicular to no-flow boundaries

- In heterogeneous soil, the tangent law is satisfied at the boundary
- If flow net is drawn such that squares exist in one part of the formation, squares also exist in areas with the same K

a1

K1

K2

a2

- Determine feasible flow rates
- Determine range of influence
- Determine required decrease of water table
- Calculate well spacings

- Well discharge under steady state can be determined using

- Well discharge under steady state can be determined using

- Well discharge under steady state WITH surface recharge can be determined using

- In homogeneous soil:

- Wells have flow rate between 1 and 100 gpm
- Some wells are in clay, others in sand

- Change the derivative into a finite difference D

- 1) Subdivide the flow region into finite blocks or subregions (discretization) such that different K values can be assigned to each block and the differentials can be converted to finite differences

- 2) Write the flow equation in algebraic form (using finite difference or finite elements) for each node or block

- 3) Use “numerical methods” to solve the resulting ‘n’ equations in ‘n’ unknowns for h subject to boundary and initial conditions

- Boundaries: h left = 10, h right = 3
- Initial conditions h = 0
- K is homogeneous = 3
- Delta x = 2