A generalized variable-head borehole permeameter analysis for saturated, unsaturated, rigid or deformable porous media

Reynolds, W. D.

doi:10.1016/j.enggeo.2014.11.019

Cited by 14 publications

(1 citation statement)

References 27 publications

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“…Considerable research has been conducted regarding analytical methods for estimating K S from borehole infiltration tests in the unsaturated zone (see e.g. Reynolds 2010Reynolds , 2011Reynolds , 2013Reynolds , 2015 and citations therein). These methods generally assume a flat-bottom cylindrical test facility (e.g.…”

Section: Borehole Permeameter Equationmentioning

confidence: 99%

Using the borehole permeameter to estimate saturated hydraulic conductivity for glacially over-consolidated soils

Kindred

Reynolds

2020

Hydrogeol J

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The borehole permeameter (BP) method was developed in the 1950s by the United States Bureau of Reclamation to estimate saturated soil hydraulic conductivity (K S) in shallow boreholes completed above the water table. The approach has been improved over the years, and now accounts for flow due to pressure, gravity and soil capillarity. However, the BP method is calibrated only for normally consolidated soils and ponding depth (H) versus borehole radius (r) ratios (H/r) ≤ 22. The primary objective of this study was to recalibrate the BP method for use in glacially over-consolidated soils with H/r ranging from 0.05 to 200. Recalibration consisted of using numerically simulated steady BP flow for five representative glacially over-consolidated soils to update the BP shape function fitting parameters (Z 1 , Z 2 , Z 3) for nine specified K S values and 15 test pit and borehole configurations. Four sets of fitting parameters were determined, which apply for H/r ≤ 20, H/r ≥ 20, soil with <12% silt content, and soil with >12% silt content. Relative to specified K S , the updated shape function parameters yielded BP estimates of K S with a maximum error of 13% and an average error of 3%, whereas the original shape function parameters (developed for normally consolidated soils and H/r ≤ 22) produced a maximum K S error of 94% and an average error of 23%. The numerical simulations were also used to develop criteria for estimating time required to achieve steady BP flow, and for correcting BP estimates of K S where steady flow was not achieved.

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Section: Borehole Permeameter Equationmentioning

confidence: 99%

Using the borehole permeameter to estimate saturated hydraulic conductivity for glacially over-consolidated soils

Kindred

Reynolds

2020

Hydrogeol J

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Bailout test, HYDRUS‐2D, and analytical modeling for estimating permeability of ephemeral stream bed

Al‐Yaqoubi,

Al‐Maktoumi,

Kacimov

et al. 2024

Vadose Zone Journal

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Accurate estimation of effective saturated hydraulic conductivity (Ksat) of a vadose zone with an underlying shallow perched aquifer is challenging. Standard pumping tests and double‐ring infiltrometers are unsuitable for this purpose. Therefore, a bailout test (BOT) was conducted in nine soil pits to evaluate the hydraulic properties of the vadose zone and the subjacent shallow‐perched aquifer in a porous bed of a wadi in Oman. The analytical (Kirkham's type) and numerical (HYDRUS‐2D) models were also used. Upon instantaneous emptying, the water level rises in a pit, owing to seepage from the ambient shallow aquifer. The draw up was monitored and compared with modeling, which assumes a homogeneous or layered van Genuchten's soil. The soils of the excavated pits were characterized as sandy‐textured, gleyed, and containing calcareous and clay‐enriched layers. A good match between HYDRUS‐analytical results for layered soils and an idealized homogeneous one illustrates that BOT is a robust and quick technique for the estimating Ksat = 2–3 cm/h in the coarse‐textured wadi bed vadose zone overlaying a transient water table. BOT is better than classical auger hole tests because they test a larger soil volume through induced seepage. BOT is also more suitable for drainage trenches and other excavations, allowing for easier observation, soil sampling from the banks, and rapid dewatering.

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Evaporation-Induced Capillary Siphoning Through Hydraulically Connected Porous Domains: The Vedernikov–Bouwer Model Revisited

Kacimov

2019

Transp Porous Med

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A generalized variable-head borehole permeameter analysis for saturated, unsaturated, rigid or deformable porous media

Cited by 14 publications

References 27 publications

Using the borehole permeameter to estimate saturated hydraulic conductivity for glacially over-consolidated soils

Using the borehole permeameter to estimate saturated hydraulic conductivity for glacially over-consolidated soils

Bailout test, HYDRUS‐2D, and analytical modeling for estimating permeability of ephemeral stream bed

Evaporation-Induced Capillary Siphoning Through Hydraulically Connected Porous Domains: The Vedernikov–Bouwer Model Revisited

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