TY - JOUR
T1 - Frequency dependent hydraulic properties estimated from oscillatory pumping tests in an unconfined aquifer
AU - Rabinovich, Avinoam
AU - Barrash, Warren
AU - Cardiff, Michael
AU - Hochstetler, David L.
AU - Bakhos, Tania
AU - Dagan, Gedeon
AU - Kitanidis, Peter K.
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - Oscillatory pumping tests were conducted at the Boise Hydrogeophysical Research Site. A periodic pressure signal is generated by pumping and injecting water into the aquifer consecutively and the pressure response is recorded at many points around the source. We present and analyze the data from the field test after applying Fourier analysis. We then match the data with a recently derived analytical solution for homogeneous formations to estimate the equivalent aquifer properties: conductivity K, specific storage Ss and specific yield Sy. The estimated values are shown to be in agreement with previous estimates conducted at this site. We observe variations in the estimated parameters with different oscillation periods of pumping. The trend of the parameters with changing period is discussed and compared to predictions by existing theory and laboratory experiments dealing with dynamic effective properties. It is shown that the results are qualitatively consistent with recent works on effective properties of formations of spatially variable properties in oscillatory flow. To grasp the impact of heterogeneity, a simple configuration is proposed, helping explain the observed increase in effective conductivity with decreasing period.
AB - Oscillatory pumping tests were conducted at the Boise Hydrogeophysical Research Site. A periodic pressure signal is generated by pumping and injecting water into the aquifer consecutively and the pressure response is recorded at many points around the source. We present and analyze the data from the field test after applying Fourier analysis. We then match the data with a recently derived analytical solution for homogeneous formations to estimate the equivalent aquifer properties: conductivity K, specific storage Ss and specific yield Sy. The estimated values are shown to be in agreement with previous estimates conducted at this site. We observe variations in the estimated parameters with different oscillation periods of pumping. The trend of the parameters with changing period is discussed and compared to predictions by existing theory and laboratory experiments dealing with dynamic effective properties. It is shown that the results are qualitatively consistent with recent works on effective properties of formations of spatially variable properties in oscillatory flow. To grasp the impact of heterogeneity, a simple configuration is proposed, helping explain the observed increase in effective conductivity with decreasing period.
KW - Effective properties
KW - Equivalent properties
KW - Field tests
KW - Oscillatory pumping
KW - Periodic pumping
KW - Specific yield
UR - http://www.scopus.com/inward/record.url?scp=84947032712&partnerID=8YFLogxK
U2 - 10.1016/j.jhydrol.2015.08.021
DO - 10.1016/j.jhydrol.2015.08.021
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AN - SCOPUS:84947032712
SN - 0022-1694
VL - 531
SP - 2
EP - 16
JO - Journal of Hydrology
JF - Journal of Hydrology
ER -