Using flow dimension sequences to interpret non-uniform aquifers with constant-rate pumping-tests: A review

Ferroud, Anouck; Rafini, Silvain; Chesnaux, Romain

doi:10.1016/j.hydroa.2018.100003

Cited by 20 publications

(18 citation statements)

References 124 publications

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“…Bourdet et al [47] developed a diagnostic plot to unify methodologies to interpret pumping test data. As reported by Renard et al [48] and Ferroud et al [49], this plot allows the identification of an appropriate conceptual model best suited to interpret the pumping test data. The method is named derivative analysis, and the most straightforward computation is reported in Equation ( 5).…”

Section: Analytical Methods For Pumping Test Analysismentioning

confidence: 87%

“…The method is named derivative analysis, and the most straightforward computation is reported in Equation ( 5). The method-consisting in the plotting of the drawdown and derivative versus time in log-log scale-allows distinguishing changes in groundwater flow regime due to variations in aquifer conditions, which are less detectable on drawdown-time plots [49,50].…”

Section: Analytical Methods For Pumping Test Analysismentioning

confidence: 99%

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Transmissivity Estimates by Specific Capacity Data of Some Fractured Italian Carbonate Aquifers

Valigi

Cambi

Checcucci

et al. 2021

Water

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Transmissivity estimates can be obtained by different approaches, mainly analytical and empirical. The application of analytical methods requires checking non-linear well losses due to turbulence and vertical flow related to partial penetration. The empirical approach relates transmissivity values to specific capacity data measured in the same well. The interpretation of available pumping tests highlights porous media solutions’ applicability in most of the step-drawdown curves analyzed. Double or triple porosity approaches are more appropriate only for wells located close to fault systems. In this work, a new relationship to estimate transmissivity by specific capacity data in some Italian carbonate aquifers is proposed. The comparison with other relationships available in the literature for similar aquifers worldwide confirms the validity of a general equation for carbonate aquifers, helping the spatial characterization of aquifer transmissivity in scarce data regions. Nonetheless, the use of equations of the same kind with different coefficients allows good results on our set of data. Results can improve the knowledge of fractured–karst aquifers by also including data from Central Italy.

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Section: Analytical Methods For Pumping Test Analysismentioning

confidence: 87%

Section: Analytical Methods For Pumping Test Analysismentioning

confidence: 99%

Transmissivity Estimates by Specific Capacity Data of Some Fractured Italian Carbonate Aquifers

Valigi

Cambi

Checcucci

et al. 2021

Water

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“…Ferroud et al () provided an in‐depth review of different interpretations and conceptual models to explain changes in flow dimensions. In fracture systems where 1< n <1.5, the basic model generally invoked assumes a single fracture controlling the initial propagation of fluid pressure ( n =1).…”

Section: Discussionmentioning

confidence: 99%

Tracking Fluid Flow in Shallow Crustal Fault Zones: 2. Insights From Cross‐Hole Forced Flow Experiments in Damage Zones

et al. 2020

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Cross-hole fluid injection tests were performed on shallow (0.5 km depth) crustal fault zones to characterize their internal flow structures on scales of 3-30 m. The data were acquired at the Grimsel Rock Laboratory, Switzerland, after the zonal isolation of damage zones in boreholes equipped with multipacker systems. We show that 80% of the pressure responses detected evolved as a power function of time due to fracture-controlled flow and were best described by a fractional model with a flow dimension (n) in the range of [1.3,1.5]. The scaling of characteristic times (t c ) and intermediate transitions in the flow dimension is shown to be inconsistent with the trend expected for normal diffusion, indicating a diffusion slowdown process caused by the spatial integration of structurally different damage zones. An analysis of the entire data set points to a subdiffusive regime where the mean squared displacement of pressure fronts, ⟨r 2 (t)⟩, scales as ⟨r 2 (t)⟩ ∝ t 0.59 , similar to an anomalous diffusion process on synthetic fractal systems. We characterize this diffusion slowdown by calculating a network connectivity exponent ( ) of 1.4, from which we estimate a fractal dimension of d f = 2.23 for the tested fault zones. Such a value close to 2.0 supports the view of fault damage zones as hierarchical systems promoting flow channeling. Our results provide further support to theoretical models of fractional flow and their application to fractured media in nature.

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“…The sequential analysis of the straight lines leads to the definition of a conceptual model (Ehlig-Economides et al 1994). The recent review by Ferroud et al (2018) illustrated diagnostic responses and their associated conceptual models. This method is a first step to identify the best mathematical model(s) that will then be used for pumping test simulations and for evaluating the operating flow rate (Bourdet et al 1983;Ehlig-Economides et al 1994;Renard et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Improving hydrogeological understanding through well-test interpretation by diagnostic plot and modelling: a case study in an alluvial aquifer in France

et al. 2021

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Using flow dimension sequences to interpret non-uniform aquifers with constant-rate pumping-tests: A review

Cited by 20 publications

References 124 publications

Transmissivity Estimates by Specific Capacity Data of Some Fractured Italian Carbonate Aquifers

Transmissivity Estimates by Specific Capacity Data of Some Fractured Italian Carbonate Aquifers

Tracking Fluid Flow in Shallow Crustal Fault Zones: 2. Insights From Cross‐Hole Forced Flow Experiments in Damage Zones

Improving hydrogeological understanding through well-test interpretation by diagnostic plot and modelling: a case study in an alluvial aquifer in France

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