TY - JOUR
AU - Shen, Qi
AB - Sinusoidal pumping tests have been widely used to determine aquifer hydraulic properties because of the advantages of separable background pressure, lower disposal costs for contaminated water and shorter time to reach relative stability. Previous studies focusing on sinusoidal pumping tests were mainly based on Darcy’s law, which considers the hydraulic gradient to be a linear function of specific discharge. This study investigated the non-Darcian effect on sinusoidal pumping tests, where the aquifer leakage and wellbore storage effects are also taken into account. Type-curve analysis results suggested that a larger inertial force coefficient (β) or a smaller leakage coefficient (B) results in a smaller drawdown amplitude. The aquifer drawdown always lags behind the change in sinusoidal pumping rate. A larger β or B results in a larger delay time between a change in the pumping rate and the drawdown. The sensitivity analysis indicated that the drawdown is more sensitive to the change in β, B or the radius of the well casing (rc) at early times of pumping. Besides, at later times the drawdown is most sensitive to rc, second to B, and least sensitive to β. Considering the special time-delay characteristics of drawdown, a new delay effect method was proposed to estimate the inertial force coefficient, hydraulic conductivity, and leakage coefficient of the confined aquifer. The applicability and robustness of this method were demonstrated in a field pumping test conducted in an aquitard-aquifer system at the Savannah River Site, South Carolina, USA.
TI - Non-Darcian effect on a sinusoidal pumping test in a leaky confined aquifer
JF - Hydrogeology Journal
DO - 10.1007/s10040-023-02618-5
DA - 2023-06-01
UR - https://www.deepdyve.com/lp/springer-journals/non-darcian-effect-on-a-sinusoidal-pumping-test-in-a-leaky-confined-8mwspaPmbY
SP - 931
EP - 946
VL - 31
IS - 4
DP - DeepDyve
ER -