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000000437 0247_ $$2DOI$$a10.1016/S0169-7722(01)00143-7
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000000437 084__ $$2WoS$$aEnvironmental Sciences
000000437 084__ $$2WoS$$aGeosciences, Multidisciplinary
000000437 084__ $$2WoS$$aWater Resources
000000437 1001_ $$0P:(DE-Juel1)129548$$aVanderborght, J.$$b0$$uFZJ
000000437 245__ $$aEstimation of local scale dispersion from local breakthrough curves during a tracer test in a heterogeneous aquifer : the Lagrangian approach
000000437 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2002
000000437 300__ $$a141 - 171
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000000437 440_0 $$03225$$aJournal of Contaminant Hydrology$$v54$$x0169-7722
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000000437 520__ $$aThe local scale dispersion tensor, D-d, is a controlling parameter for the dilution of concentrations in a solute: plume that is displaced by groundwater flow in a heterogeneous aquifer. In this paper, we estimate the local scale dispersion froth time series or breakthrough curves, BTCs, of Br- concentrations that were measured at several pints in a fluvial aquifer during a natural gradient tracer test at Krauthausen. Locally Measured BTCs were characterized by equivalent convection dispersion parameters: equivalent velocity, nu(eq)(x) and expected equivalent dispersivity, <lambda(eq)(x)>. A Lagrangian framework was used to approximately predict these equivalent parameters in terns of the spatial covariance of log(e) transformed conductivity and the local scale dispersion coefficient.The approximate Lagrangian theory illustrates that <lambda(eq)(x)> increases with increasing travel distance and is much larger than the local scale dispersivity, lambda(d). A sensitivity analysis indicates that <lambda(eq)(x)> is predominantly determined by the transverse component of the local scale dispersion and by the correlation scale of the hydraulic conductivity in the transverse to flow direction whereas it is relatively insensitive to the longitudinal component of the local scale dispersion. By comparing predicted <lambda(eq)(x)> for a range of D-d values with <lambda(eq)(x)> obtained from locally measured BTCs, the transverse component of D-d, D-dT, was estimated. The estimated transverse local scale dispersivity, lambda(dT) = D-dT/U-1 (U-1 = mean advection velocity) is in the order of 10(1)-10(2) mm, which is relatively large but realistic for the fluvial gravel sediments at Krauthausen. (C) 2002 Elsevier Science B.V. All rights reserved.
000000437 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000000437 65320 $$2Author$$aheterogeneous aquifers
000000437 65320 $$2Author$$adilution
000000437 65320 $$2Author$$abreakthrough curses
000000437 65320 $$2Author$$adispersion
000000437 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b1$$uFZJ
000000437 773__ $$0PERI:(DE-600)1494766-3$$a10.1016/S0169-7722(01)00143-7$$gVol. 54, p. 141 - 171$$p141 - 171$$q54<141 - 171$$tJournal of contaminant hydrology$$v54$$x0169-7722$$y2002
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000000437 9141_ $$y2002
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