A Numerical Study of Barometric Pumping Jeff Sondrup AgE 588 Fluid Mechanics of Porous Materials April 11, 2001.

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Presentation transcript:

A Numerical Study of Barometric Pumping Jeff Sondrup AgE 588 Fluid Mechanics of Porous Materials April 11, 2001

Presentation Outline Introduction Gas Transport & Barometric Pumping Model Description Model Results Conclusions

Subsurface Disposal Area, INEEL

VOC Background at the SDA VOCs first discovered in GW near SDA in 1987 Soil gas survey confirmed SDA pits and trenches were a VOC source Inventory search indicated sludges containing VOCs from Rocky Flats buried in SDA ( ) Primarily carbon tetrachloride (CCl 4 ) with TCE, PCE, and TCA Vadose zone vapor sampling indicates a large plume GW concentrations ND to slightly above MCL Modeling estimates GW concentrations to peak decades in the future at several times MCL ROD signed in 1994, Soil Vapor Extraction (SVE) preferred alternative Five extraction wells began operating 1996, removed ~75,000 lbs TVOCs, ~48,000 lbs CCl 4

Gas Transport Mechanisms in the Vadose Zone Advection (contaminants travel with the bulk movement of air) –Natural: water displacement, barometric pressure changes, density –Induced: drilling, soil vapor extraction (SVE) Diffusion (random motion of molecules) Sorption (contaminants adhere to the rock/soil) Vapor-Liquid Partitioning (contaminants move into and out of air-water)

Barometric Pumping

Barometric Pressure Data

Model Geometry & Grid

Hydraulic Properties of Fractured Basalt and Sediment

Properties of Carbon Tetrachloride

Barometric Pressure Data

Barometric Pressure Sine Wave Approximation

Base Case Simulation (No Barometric Pumping)

Barometric Pumping (Square Wave Approximation  t=1 day)

Barometric Pumping (Square Wave Approximation  t=10 day)

Barometric Pumping (Sine Wave Approximation  t=1 day)

CCl4 Vertical Profile (1 year)

CCl4 Vertical Profile (5 years)

CCl 4 Mass Remaining in VZ

CCl 4 Mass Accounting (Barometric Pumping, Square Wave,  t=1 day)

Conclusions Time step important when simulating BP Square wave approximation is reasonable if pressure patterns predictable and repeatable BP impact small but can be important Impact is site and event specific (depends on contaminant, location, pressure patterns, subsurface) Diffusion is the dominant mechanism BP important for passive soil venting (gas extraction)