Search Results - "Neuman, S. P."

Maximum likelihood Bayesian averaging of uncertain model predictions by Neuman, S P

“…Hydrologic analyses typically rely on a single conceptual-mathematical model. Yet hydrologic environments are open and complex, rendering them prone to…”
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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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Scalable statistics of correlated random variables and extremes applied to deep borehole porosities by Guadagnini, A, Neuman, S. P, Nan, T, Riva, M, Winter, C. L

“…We analyze scale-dependent statistics of correlated random hydrogeological variables and their extremes using neutron porosity data from six deep boreholes, in…”
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Extended power-law scaling of air permeabilities measured on a block of tuff by Siena, M, Guadagnini, A, Riva, M, Neuman, S. P

“…We use three methods to identify power-law scaling of multi-scale log air permeability data collected by Tidwell and Wilson on the faces of a laboratory-scale…”
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Extended power-law scaling of heavy-tailed random air-permeability fields in fractured and sedimentary rocks by Guadagnini, A, Riva, M, Neuman, S. P

“…We analyze the scaling behaviors of two field-scale log permeability data sets showing heavy-tailed frequency distributions in three and two spatial…”
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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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On the identification of Dragon Kings among extreme-valued outliers by Riva, M, Neuman, S P, Guadagnini, A

“…Extreme values of earth, environmental, ecological, physical, biological, financial and other variables often form outliers to heavy tails of empirical…”
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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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Data assimilation and parameter estimation via ensemble Kalman filter coupled with stochastic moment equations of transient groundwater flow by Panzeri, M., Riva, M., Guadagnini, A., Neuman, S. P.

“…Key Points Embedding stochastic moment equations of flow in ensemble Kalman filter Avoiding need for Monte Carlo simulations in ensemble Kalman filter Avoiding…”
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A comparison of seven geostatistically based inverse approaches to estimate transmissivities for modeling advective transport by groundwater flow by Zimmerman, D. A., Marsily, G., Gotway, C. A., Marietta, M. G., Axness, C. L., Beauheim, R. L., Bras, R. L., Carrera, J., Dagan, G., Davies, P. B., Gallegos, D. P., Galli, A., Gómez‐Hernández, J., Grindrod, P., Gutjahr, A. L., Kitanidis, P. K., Lavenue, A. M., McLaughlin, D., Neuman, S. P., RamaRao, B. S., Ravenne, C., Rubin, Y.

“…This paper describes the first major attempt to compare seven different inverse approaches for identifying aquifer transmissivity. The ultimate objective was…”
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Anisotropic statistical scaling of vadose zone hydraulic property estimates near Maricopa, Arizona by Guadagnini, A., Neuman, S. P., Schaap, M. G., Riva, M.

“…Fluid flow and mass transport in the vadose zone are strongly influenced by spatial variability in soil hydraulic properties. It has become common to…”
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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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Type curve interpretation of a cross-hole pneumatic injection test in unsaturated fractured tuff by Illman, Walter A., Neuman, Shlomo P.

“…Cross‐hole pneumatic injection tests have been conducted in 16 vertical and inclined boreholes in unsaturated fractured tuffs at the Apache Leap Research Site…”
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Conditioning mean steady state flow on hydraulic head and conductivity through geostatistical inversion by Hernandez, A F, Neuman, S P, Guadagnini, A, Carrera, J

“…Nonlocal moment equations allow one to render deterministically optimum predictions of flow in randomly heterogeneous media and to assess predictive…”
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Maximum likelihood Bayesian averaging of spatial variability models in unsaturated fractured tuff by Ye, Ming, Neuman, Shlomo P., Meyer, Philip D.

“…Hydrologic analyses typically rely on a single conceptual‐mathematical model. Yet hydrologic environments are open and complex, rendering them prone to…”
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Nonlocal and localized analyses of conditional mean steady state flow in bounded, randomly nonuniform domains: 1. Theory and computational approach by Guadagnini, Alberto, Neuman, Shlomo P.

“…We consider the effect of measuring randomly varying hydraulic conductivitiesK(x) on one's ability to predict numerically, without resorting to either Monte…”
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Nonlocal and localized analyses of conditional mean steady state flow in bounded, randomly nonuniform domains: 2. Computational examples by Guadagnini, Alberto, Neuman, Shlomo P.

“…In paper 1 [Guadagnini and Neuman, this issue] of this two‐part series we presented exact nonlocal equations for first and second conditional ensemble moments…”
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Type-curve estimation of statistical heterogeneity by Neuman, Shlomo P., Guadagnini, Alberto, Riva, Monica

“…The analysis of pumping tests has traditionally relied on analytical solutions of groundwater flow equations in relatively simple domains, consisting of one or…”
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Stochastic groundwater models in practice by Neuman, S P

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