Research paperObservations of particle movement in a monitoring well using the colloidal borescope
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Individual and joint inversion of head and flux data by geostatistical hydraulic tomography
2021, Advances in Water ResourcesCitation Excerpt :The most popular technique for quantifying groundwater flux in the field was based on dilution tests (Drost et al., 1968; Jamin et al., 2015; Schneider et al., 2019), where the dilution of an injected tracer inside a screened borehole or within packers is used to estimate the horizontal groundwater flux. Other approaches, such as the colloidal borescope (Kearl, 1997), the point velocity probe (Labaky et al., 2007) or the in-situ permeable flow sensor (Ballard et al., 1996), can also measure the horizontal groundwater flux. A comprehensive review of the groundwater velocity measurement approaches is provided by Devlin (2020).
Characterisation of fractured carbonate aquifers using ambient borehole dilution tests
2020, Journal of HydrologyAn innovative tool for groundwater velocity measurement compared with other tools in laboratory and field tests
2019, Journal of Hydrology XCitation Excerpt :The unit is best deployed with velocities greater than 50 cm.day−1. The Colloidal Borescope (Kearl, 1997; Kearl et al., 1999) is a tool employing direct observation of particles in the well screen. These measured velocities are averaged to obtain a mean Darcy flux.
An In-Well Point Velocity Probe for the rapid determination of groundwater velocity at the centimeter-scale
2018, Journal of HydrologyCitation Excerpt :More recently, other methods of direct groundwater velocity measurement have been developed. Examples of in-well techniques include the point dilution method, the colloidal borescope, the passive flux meter, the heat-pulse flowmeter, and the acoustic Doppler flowmeter (Drost et al., 1968; Hatfield et al., 2004; Kearl, 1997; Kerfoot, 1988; Wilson et al., 2001). In-well techniques can assess spatial variability across a site economically by redeploying probes in multiple wells.
A simple reason explains why it is so difficult to assess groundwater ages and contamination ages
2017, Science of the Total EnvironmentCitation Excerpt :The first mixing occurs in the borehole wall: a damaged and/or poorly sealed wall creates vertical hydraulic short-circuits between aquifer layers (Chapuis and Sabourin, 1989; Chesnaux et al., 2006) and mixes waters down to the screen where water is sampled. The second mixing takes place within the well screen and filter pack, and its probability increases with the filter pack length (Kearl, 1997; Zinn and Konikow, 2007; Berthold and Börner, 2008; Baudron et al., 2014). This paper does not examine the two man-made processes.
VelProbePE: An automated spreadsheet program for interpreting point velocity probe breakthrough curves
2012, Computers and Geosciences