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Sampling Radius of a Porous Cup Sampler: Experimental Results
Author(s) -
Morrison R. D.,
Lowery B.
Publication year - 1990
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1990.tb02254.x
Subject(s) - potassium bromide , radius , sampling (signal processing) , water content , porosity , moisture , analytical chemistry (journal) , volume (thermodynamics) , soil test , potassium , environmental science , soil science , chemistry , mineralogy , hydrology (agriculture) , materials science , soil water , chromatography , geology , composite material , physics , geotechnical engineering , optics , thermodynamics , computer security , organic chemistry , detector , computer science
Laboratory experiments were conducted to examine the radius of soil (sand) sampled (S r ) by a porous cup sampler. S r was defined by the detection of potassium bromide (KBr) in a sample when KBr was injected at horizontal distances of 5, 10, 15, 30, and 45 cm from the sampler. For quasi‐static soil moisture conditions, the relation between S r as defined by the arrival time of KBr (t) at the sampler (evacuated with a constant vacuum of 70kPa) after it was injected at a distance (x) was described by t = 1.4x 2.3 . As expected, desaturation occurred most rapidly near the sampler (0‐5 cm). The amount of KBr collected on a mass balance basis was greatest when KBr was injected near the sampler and decreased with injection distance. The injection of KBr into the soil at a prescribed distance from the sampler was a better method for predicting S r for a given time than change in matric potential of the soil.