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- W2896781855 abstract "Abstract We present a trajectory‐based technique for calculating solute transport in a porous medium that has several advantages over existing methods. Unlike streamlines, the extended trajectories are influenced by each of the important parameters governing transport, including molecular diffusion and transverse dispersion. The approach is complete and does not require any additional techniques, such as operator splitting or particle tracking, in order to account for the full dispersion tensor. The semianalytic expressions make it clear how the flow field, the concentration distribution, and the dispersion tensor contribute to the velocity field of an injected solute. The equations are valid for an arbitrary porous medium, including those with rapid spatial variations in properties, overcoming limitations faced by previous approaches based upon asymptotic techniques. A test on a layered model with sharp boundaries indicates that the extended trajectories are compatible with the results of a numerical simulator and differ from streamlines. We also describe a new form of the dispersion tensor that incorporates a known asymmetry. The trajectories indicate that the modifications of the dispersion tensor lead to more focused transport within regions of high conductivity. Finally, the trajectories are used to define a semianalytic relationship between solute travel times and variations in solute velocities along a path that may be used for tomographic imaging. In an application to the injection of a radioactive tracer into a Berea sandstone core, monitored using micropositron emission tomographic (micro‐PET) observations, the sensitivities are used to map the spatial variations of permeability within the core." @default.
- W2896781855 created "2018-10-26" @default.
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- W2896781855 date "2018-09-01" @default.
- W2896781855 modified "2023-09-30" @default.
- W2896781855 title "Calculating Trajectories Associated With Solute Transport in a Heterogeneous Medium" @default.
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- W2896781855 doi "https://doi.org/10.1029/2018wr023019" @default.
- W2896781855 hasPublicationYear "2018" @default.
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