In-situ permeability measurements with direct push techniques: Phase II topical report

Lowry, William E.; Mason, N.; Chipman, Veraun; Kisiel, K.; Stockton, J.

doi:10.2172/773872

Cited by 19 publications

(18 citation statements)

References 2 publications

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“…6 times less than those in cored holes drilled by soil samplers; this effect was particularly evident in soils with low permeability. Lowry et al (1999), Butler et al (2007 and Liu et al (2008Liu et al ( , 2009) also emphasised that the disturbance produced by tool compaction is a major limitation. The effect of soil disturbance is an unavoidable problem for most DP-based approaches, with no obvious practical solution.…”

Section: Occurrence Of Turbulent Flowmentioning

confidence: 99%

A constant-head pumping test method using direct-push equipment for in situ hydraulic conductivity measurements

et al. 2012

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A novel direct-push (DP) probe was developed for in situ hydraulic conductivity measurements in unconfined sandy aquifers. It is a small-diameter tool with an intake screen and a built-in pressure transducer, and is directly pushed into the ground. Hydraulic conductivity k is estimated by pumping from an aquifer through the intake screen and, while doing so, measuring flow rate and water pressure. This paper describes first the DP system and then the procedures for estimating k values. The finite-element method was employed to obtain intake factors that correlate the measurements with the k values, and these intake factors were compared with those proposed for conventional borehole packer tests. Laboratory and field experiments were also performed to assess the usability of the DP equipment. The results showed that the k estimates obtained from the new probe agreed with those obtained by other methods. The results of this assessment indicate that the proposed DP technique is a promising tool for simple and rapid in situ measurements of hydraulic conductivity. Limitations to the technology are discussed, and further work is suggested.

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Section: Occurrence Of Turbulent Flowmentioning

confidence: 99%

A constant-head pumping test method using direct-push equipment for in situ hydraulic conductivity measurements

et al. 2012

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“…The primary analysis method for the DPP uses the pumping‐induced head gradient (Δ h ) between the two transducers (Figures 2a and 2b). Once that gradient has stabilized, K is calculated with a simple expression based on the spherical form of Darcy’s Law (Lowry et al 1999):…”

Section: The Direct‐push Permeametermentioning

confidence: 99%

“…An important advantage of these two analysis methods is that both the pumping‐induced head gradient (Δ h ) and the pressure head change (Δ p i ) are minimally affected by the zone of compaction created during tool advancement (Lowry et al 1999). Even when compaction creates a low K zone in the vicinity of the DPP, that zone will have a very small impact on Δ h and Δ p i and thus the K estimate.…”

Section: The Direct‐push Permeametermentioning

confidence: 99%

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Characterizing Hydraulic Conductivity with the Direct‐Push Permeameter

Butler¹,

Dietrich

Wittig

et al. 2007

Groundwater

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The direct-push permeameter (DPP) is a promising approach for obtaining high-resolution information about vertical variations in hydraulic conductivity (K) in shallow unconsolidated settings. This small-diameter tool, which consists of a short screened section with a pair of transducers inset in the tool near the screen, is pushed into the subsurface to a depth at which a K estimate is desired. A short hydraulic test is then performed by injecting water through the screen at a constant rate (less than 4 L/min) while pressure changes are monitored at the transducer locations. Hydraulic conductivity is calculated using the injection rate and the pressure changes in simple expressions based on Darcy's Law. In units of moderate or higher hydraulic conductivity (more than 1 m/d), testing at a single level can be completed within 10 to 15 min. Two major advantages of the method are its speed and the insensitivity of the K estimates to the zone of compaction created by tool advancement. The potential of the approach has been assessed at two extensively studied sites in the United States and Germany over a K range commonly faced in practical field investigations (0.02 to 500 m/d). The results of this assessment demonstrate that the DPP can provide high-resolution K estimates that are in good agreement with estimates obtained through other means.

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“…The bulk of the water table aquifer groundwater flow occurs within these higher conductivity sand layers. (Phifer, et al, 1996;Lowry, et al, 1999; Table 7 provides water level data for selected DCPRB wells. As shown at well cluster DCB-20 there is a downward gradient all the way into the Gordon Aquifer.…”

Section: D-area Coal Pile Runoff Basin (Dcprb) Hydrogeologymentioning

confidence: 99%

D-Area Coal Pile Runoff Basin Sulfate Reduction Literature Review and Feasibility Report

Phifer¹

2002

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In-situ permeability measurements with direct push techniques: Phase II topical report

Cited by 19 publications

References 2 publications

A constant-head pumping test method using direct-push equipment for in situ hydraulic conductivity measurements

A constant-head pumping test method using direct-push equipment for in situ hydraulic conductivity measurements

Characterizing Hydraulic Conductivity with the Direct‐Push Permeameter

D-Area Coal Pile Runoff Basin Sulfate Reduction Literature Review and Feasibility Report

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