Flow dimensions corresponding to hydrogeologic conditions

Walker, Douglas D.; Roberts, R. B.

doi:10.1029/2002wr001511

Cited by 41 publications

(31 citation statements)

References 20 publications

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“…The curve-fitting procedure can be expanded so that in addition to fitting the drawdown data to a type-curve, the drawdown derivative (defined as ds/dlog(t)) data can be fitted to a derivative typecurve as well (Spane and Wurstner, 1993). A rule of thumb for inferring the flow dimension from the drawdown derivative's slope, at late times, is to use dZ2 (1Kslope) (Walker and Roberts, 2003).…”

Section: Flow-dimension Analysis Of Interference Testsmentioning

confidence: 99%

The conceptualization of a channel network through macroscopic analysis of pumping and tracer tests in fractured chalk

Kurtzman

Nativ

Adar

2005

Journal of Hydrology

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Section: Flow-dimension Analysis Of Interference Testsmentioning

confidence: 99%

The conceptualization of a channel network through macroscopic analysis of pumping and tracer tests in fractured chalk

Kurtzman

Nativ

Adar

2005

Journal of Hydrology

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“…11a). Additional analysis can be applied for further model evaluation like flow dimension analysis as indicated by, for example, Walker et al (2003), Maréchal et al (2008), and Cello et al (2009).…”

Section: Comparison With Measured Datamentioning

confidence: 99%

Representation of water abstraction from a karst conduit with numerical discrete-continuum models

Reimann

Giese²,

Geyer³

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Karst aquifers are characterized by highly conductive conduit flow paths embedded in a less conductive fissured and fractured matrix, resulting in strong permeability contrasts with structured heterogeneity and anisotropy. Groundwater storage occurs predominantly in the fissured matrix. Hence, most mathematical karst models assume quasi-steady-state flow in conduits neglecting conduitassociated drainable storage (CADS). The concept of CADS considers storage volumes, where karst water is not part of the active flow system but hydraulically connected to conduits (for example karstic voids and large fractures). The disregard of conduit storage can be inappropriate when direct water abstraction from karst conduits occurs, e.g., largescale pumping. In such cases, CADS may be relevant. Furthermore, the typical fixed-head boundary condition at the karst outlet can be inadequate for water abstraction scenarios because unhampered water inflow is possible.The objective of this work is to analyze the significance of CADS and flow-limited boundary conditions on the hydraulic behavior of karst aquifers in water abstraction scenarios. To this end, the numerical discrete-continuum model MODFLOW-2005 Conduit Flow Process Mode 1 (CFPM1) is enhanced to account for CADS. Additionally, a fixed-head limited-flow (FHLQ) boundary condition is added that limits inflow from constant head boundaries to a user-defined threshold. The effects and the proper functioning of these modifications are demonstrated by simplified model studies. Both enhancements, CADS and FHLQ boundary, are shown to be useful for water abstraction scenarios within karst aquifers. An idealized representation of a large-scale pumping test in a karst conduit is used to demonstrate that the enhanced CFPM1 is able to adequately represent water abstraction processes in both the conduits and the matrix of real karst systems, as illustrated by its application to the Cent Fonts karst system.

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“…Das Konzept der Strömungsdimensionalität zur Beschreibung der Geometrie hydraulisch aktivierter Kluftnetze hat deshalb vermehrt Akzeptanz gefunden, weil es hilft, die Wegigkeiten von Strömungen im Gebirge zu beschreiben [14]. Die Dimension der Strömung n ist dabei der Exponent+1 um den sich die durchströmte Fläche einer Kluft mit der radialen Entfernung vom Bohrloch ändert.…”

Section: Dimension Der Strömungunclassified

The use of transient pressure analysis at the Dounreay Shaft Isolation Project

Pollard¹,

Jones²,

Whitfield³

2009

Geomechanics and Tunnelling

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This paper provides an assessment of the use of pressure fall-off data during the Dounreay Shaft Isolation Project. The instrumentation controlling the injection of grout monitors and records both the pressure and the flow rate throughout the process, so pressure fall-off data is collected during any pauses to, and at the end of, each grout injection. The shapes of the pressure fall-off vs time curves have been examined qualitatively and categorised. The fall-off data has also been examined using PanSystem well test software, which creates the pressure change and pressure derivative curves, then attempts to simulate the fall-off curve by iteration after selection of a flow and boundary model chosen from the wide range available. The implications that the shapes of the pressure and derivative curves and the flow and boundary models have for the grout curtain have been examined. The caveats that surround the quantitative use of results from PanSystem analyses for a cement grout rather than a Newtonian fluid are discussed.

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Flow dimensions corresponding to hydrogeologic conditions

Cited by 41 publications

References 20 publications

The conceptualization of a channel network through macroscopic analysis of pumping and tracer tests in fractured chalk

The conceptualization of a channel network through macroscopic analysis of pumping and tracer tests in fractured chalk

Representation of water abstraction from a karst conduit with numerical discrete-continuum models

The use of transient pressure analysis at the Dounreay Shaft Isolation Project

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