Search Results - "Neuman, S.P"

EnKF coupled with groundwater flow moment equations applied to Lauswiesen aquifer, Germany by Panzeri, M., Riva, M., Guadagnini, A., Neuman, S.P.

“…•Traditional EnKF assimilation requires computationally intensive MC simulations.•Coupling EnKF with moment equations (MEs) eliminates this need and…”
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Theory and generation of conditional, scalable sub‐ G aussian random fields by Panzeri, M., Riva, M., Guadagnini, A., Neuman, S.P.

“…Abstract Many earth and environmental (as well as a host of other) variables, Y , and their spatial (or temporal) increments, Δ Y , exhibit non‐Gaussian…”
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Theory and generation of conditional, scalable sub‐Gaussian random fields by Panzeri, M., Riva, M., Guadagnini, A., Neuman, S.P.

“…Many earth and environmental (as well as a host of other) variables, Y, and their spatial (or temporal) increments, ΔY, exhibit non‐Gaussian statistical…”
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Comparison of Ensemble Kalman Filter groundwater-data assimilation methods based on stochastic moment equations and Monte Carlo simulation by Panzeri, M., Riva, M., Guadagnini, A., Neuman, S.P.

“…•Traditional EnKF assimilation requires computationally intensive MC simulations.•There is no general theory to determine a priori the number of MC…”
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Anisotropic statistical scaling of soil and sediment texture in a stratified deep vadose zone near Maricopa, Arizona by Guadagnini, A., Neuman, S.P., Schaap, M.G., Riva, M.

“…We analyze the statistical scaling properties of vertical and horizontal increments in soil and sediment texture data measured to a depth of 15m over an area…”
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Three-dimensional saturated-unsaturated flow with axial symmetry to a partially penetrating well in a compressible unconfined aquifer by Tartakovsky, G.D, Neuman, S.P

“…1 A new analytical solution is presented for the delayed response process characterizing flow to a partially penetrating well in an unconfined aquifer. The new…”
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Non-local and localized analyses of non-reactive solute transport in bounded randomly heterogeneous porous media: Theoretical framework by Morales-Casique, Eric, Neuman, Shlomo P., Guadagnini, Alberto

“…Solute transport in randomly heterogeneous media is described by stochastic transport equations that are typically solved via Monte Carlo simulation. A…”
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On the geostatistical characterization of hierarchical media by Neuman, S.P, Riva, M, Guadagnini, A

“…The subsurface consists of porous and fractured materials exhibiting a hierarchical geologic structure, which gives rise to systematic and random spatial and…”
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Inverse stochastic moment analysis of steady state flow in randomly heterogeneous media by Hernandez, A.F, Neuman, S.P, Guadagnini, A, Carrera, J

“…Nonlocal stochastic moment equations have been used successfully to analyze steady state and transient flow in randomly heterogeneous media conditional on…”
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Nonlocal and localized analyses of nonreactive solute transport in bounded randomly heterogeneous porous media: Computational analysis by Morales-Casique, Eric, Neuman, Shlomo P., Guadagnini, Alberto

“…In a companion paper we presented exact (though implicit and not closed) nonlocal conditional first and second moment equations for nonreactive…”
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Sensitivity analysis and assessment of prior model probabilities in MLBMA with application to unsaturated fractured tuff by Ye, M, Neuman, S.P, Meyer, P.D, Pohlmann, K

“…Previous application of maximum likelihood Bayesian model averaging (MLBMA, Neuman (2002, 2003)) to alternative variogram models of log air permeability data…”
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Blueprint for perturbative solution of flow and transport in strongly heterogeneous composite media using fractal and variational multiscale decomposition by Neuman, S.P

“…This paper offers a blueprint for extending perturbative ensemble moment (and potentially other, e.g., Gaussian or perturbative Karhunen-Loéve) solutions of…”
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Transient flow in bounded randomly heterogeneous domains. 1. Exact conditional moment equations and recursive approximations by Tartakovsky, D.M. (University of Arizona, Tucson.), Neuman, S.P

“…We consider the effect of measuring randomly varying local hydraulic conductivities K(x) on one's ability to predict transient flow within bounded domains,…”
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On the tensorial nature of advective porosity by Neuman, Shlomo P.

“…Field tracer tests indicate that advective porosity, the quantity relating advective velocity to Darcy flux, may exhibit directional dependence. Hydraulic…”
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Conditional stochastic averaging of steady state unsaturated flow by means of Kirchhoff transformation by Tartakovsky, D.M, Neuman, S.P, Lu, Z

“…We consider the effect of measuring randomly varying soil hydraulic properties on one's ability to predict steady state unsaturated flow subject to random…”
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Transient effective hydraulic conductivities under slowly and rapidly varying mean gradients in bounded three-dimensional random media by Tartakovsky, D.M. (University of Arizona, Tucson.), Neuman, S.P

“…We have shown elsewhere [Tartakovsky and Neuman, this issue (a)] that in randomly heterogeneous media, the ensemble mean transient flux is generally nonlocal…”
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Transient flow in bounded randomly heterogeneous domains. 2. Localization of conditional mean equations and temporal nonlocality effects by Tartakovsky, D.M. (University of Arizona, Tucson.), Neuman, S.P

“…In randomly heterogeneous porous media one cannot predict flow behavior with certainty. One can, however, render optimum unbiased predictions of such behavior…”
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