Interpretation of a Pumping Test with Interference from a Neighboring Well

Weber, Simon; Chapuis, Robert P.

doi:10.1111/gwat.12014

Cited by 15 publications

(12 citation statements)

References 9 publications

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“…Weber and Chapuis (2013) showed in fact that in an isotropic aquifer, the difference on the T and S values with either infinitesimal or finite diameter wells is small when the interfering well is taken into account, but can be important when it is neglected.…”

Section: Application On Numerical Data Setsmentioning

confidence: 99%

“…The methods presented in this article are based on two existing methods: Papadopulos (1965) for the anisotropy; and Weber and Chapuis (2013) for the interferences between wells. Both of these methods apply to confined, horizontal and homogenous aquifers of infinite extent.…”

Section: Theoretical Aspectsmentioning

confidence: 99%

“…As a consequence, from now on and to simplify the following equations, the pumping well will again be considered to be at the origin of the coordinate system. Similarly to Weber and Chapuis (2013), Equation 5 can be written as follows:…”

Section: Theoretical Aspectsmentioning

confidence: 99%

“…More iteration steps may be used if the difference between two successive T values is not small enough. Weber and Chapuis (2013) proposed new methods based on the Cooper and Jacob (1946) equation and the superposition principle to interpret pumping test data under the influence of an interfering well that was in operation before the tested well.…”

Section: Introductionmentioning

confidence: 99%

“…This article presents two methods, developed similarly to the Weber and Chapuis (2013) method and based on the Papadopulos (1965) equation, to interpret pumping test data influenced by an interfering well in a confined anisotropic aquifer. The first method applies if the interfering well has been in operation before the tested well, and the second one if the pumping test has started before the pumping in the interfering well.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Interpreting a Pumping Test Influenced by Another Well in an Anisotropic Aquifer

Weber¹,

Chapuis

Duhaime

2013

Groundwater

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In confined aquifers the influence of neighboring active wells is often neglected when interpreting a pumping test. This can, however, lead to an erroneous interpretation of the pumping test data. This article presents simple methods to evaluate the transmissivity tensor and storativity of an anisotropic confined aquifer when there is an interfering well in the neighborhood of the tested well. Two methods have been developed depending on whether the tested well or the interfering well is the first in operation. These new methods yield better estimates of the hydraulic parameters than when the influence of the interfering well is neglected. These methods have then been used on data obtained from numerical models with an interfering well and the results have been compared to an analytical method that neglects the influence of the interfering well. The methods require knowledge of the pumping rate of the interfering well and the time elapsed since the pumping started in each well. If the interfering well started pumping before the tested well, the method does not require knowledge of the aquifer piezometric level at the beginning of the test, which is often unknown in this case. As for the method without interference, at least three monitoring wells (MWs) are needed, the position of which influences the accuracy of the estimated parameters. Some recommendations concerning MWs position have been given to get more accurate results according to the sought parameter.

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Section: Application On Numerical Data Setsmentioning

confidence: 99%

Section: Theoretical Aspectsmentioning

confidence: 99%

Section: Theoretical Aspectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Interpreting a Pumping Test Influenced by Another Well in an Anisotropic Aquifer

Weber¹,

Chapuis

Duhaime

2013

Groundwater

Self Cite

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Steady state analytical solutions for pumping in a fully bounded rectangular aquifer

Xin

et al. 2015

Water Resources Research

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Using the Schwartz-Christoffel conformal mapping method together with the complex variable techniques, we derive steady state analytical solutions for pumping in a rectangular aquifer with four different combinations of impermeable and constant-head boundaries. These four scenarios include: (1) one constant-head boundary and three impermeable boundaries, (2) two pairs of orthogonal impermeable and constant-head boundaries, (3) three constant-head boundaries and one impermeable boundary, and (4) four constant-head boundaries. For these scenarios, the impermeable and constant-head boundaries can be combined after applying the mapping functions, and hence only three image wells exist in the transformed plane, despite an infinite number of image wells in the real plane. The closed-form solutions reflect the advantage of the conformal mapping method, though the method is applicable for the aspect ratio of the rectangle between 1/10.9 and 10.9/1 due to the limitation in the numerical computation of the conformal transformation from a half plane onto an elongated region (i.e., so-called ''crowding'' phenomenon). By contrast, for an additional scenario with two parallel constant-head boundaries and two parallel impermeable boundaries, an infinite series of image wells is necessary to express the solution, since it is impossible to combine these two kinds of boundaries through the conformal transformation. The usefulness of the results derived is demonstrated by an application to pumping in a finite coastal aquifer.

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Forest fire effects on groundwater in a coastal aquifer (Ravenna, Italy)

Giambastiani

Greggio

Nobili

et al. 2018

Hydrological Processes

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We examined the fire-induced changes in groundwater recharge rate. This aspect is particularly important in the case of large forested areas growing over a coastal aquifer affected by saltwater intrusion. In the Ravenna coastal area (Italy), pine forests grow on coastal dune belts, overlying a sandy unconfined aquifer, which is strongly affected by marine ingression. Three groundwater profiles across the forest and perpendicular to the coastline were monitored for groundwater level, physical, and chemical parameters. The aims were to define groundwater quality, recharge rate, freshwater volume, and highlight change, which occurred after a forest fire with reference to pre-fire conditions. Analytical solutions based on Darcy Law and the Dupuit Equation were applied to calculate unconfined flow and compare recharge rates among the profiles. The estimated recharge rates increased in the partially and completely burnt areas (219 and 511 mm year −1 , respectively) compared with the pristine pine forest area (73 mm year −1 ). Although pre-fire conditions were similar in all monitored profiles, a post-fire decrease in salinity was observed across the burnt forest, along with an increase in infiltration and freshwater lens thickness. This was attributed to decrease canopy interception and evapotranspiration caused by vegetation absence after the fire. This research provided an example of positive forest fire feedback on the quantity and quality of fresh groundwater resources in a lowland coastal aquifer affected by saltwater intrusion, with limited availability of freshwater resources. The fire provided an opportunity to evaluate a new forest management approach and consider the restoration and promotion of native dune herbaceous vegetation.

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Interpretation of a Pumping Test with Interference from a Neighboring Well

Cited by 15 publications

References 9 publications

Interpreting a Pumping Test Influenced by Another Well in an Anisotropic Aquifer

Interpreting a Pumping Test Influenced by Another Well in an Anisotropic Aquifer

Steady state analytical solutions for pumping in a fully bounded rectangular aquifer

Forest fire effects on groundwater in a coastal aquifer (Ravenna, Italy)

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