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Article
Open AccessProbabilistic reconstruction via machine-learning of the Po watershed aquifer system (Italy)
A machine-learning-based methodology is proposed to delineate the spatial distribution of geomaterials across a large-scale three-dimensional subsurface system. The study area spans the entire Po River Basin i...
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Article
Open AccessSensitivity-based Parameter Calibration of Single- and Dual-continuum Coreflooding Simulation Models
Our study is keyed to the development of a viable framework for the stochastic characterization of coreflooding simulation models under two- and three-phase flow conditions taking place within a core sample in...
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Article
Open AccessSensitivity Analysis and Quantification of the Role of Governing Transport Mechanisms and Parameters in a Gas Flow Model for Low-Permeability Porous Media
Recent models represent gas (methane) migration in low-permeability media as a weighted sum of various contributions, each associated with a given flow regime. These models typically embed numerous chemical/ph...
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Article
Open AccessStatistical Characterization of Heterogeneous Dissolution Rates of Calcite from In situ and Real-Time AFM Imaging
The evolution of the surface topography of a calcite crystal subject to dissolution is documented through in situ real-time imaging obtained via atomic force microscopy (AFM). The dissolution process takes pla...
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Chapter and Conference Paper
Geogenic Arsenic Release by Iron-Oxides Reductive Dissolution in Aquifer Systems
We focus on modeling geogenic arsenic mobilization induced by Fe-oxides reductive dissolution and aim at a preliminary assessment of the potential of such a mechanism to release arsenic under conditions that a...
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Article
Grid convergence for numerical solutions of stochastic moment equations of groundwater flow
We provide qualitative and quantitative assessment of the results of a grid convergence study in terms of (a) the rate/order of convergence and (b) the grid convergence index, GCI, associated with the numerica...
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Article
Probabilistic analysis of risk and mitigation of deepwater well blowouts and oil spills
The development of robust risk assessment procedures for offshore oil and gas operations is a major element for the assessment of the potential feedback between planned activities and the environment. We illus...
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Article
Correction to: A Class-Kriging Predictor for Functional Compositions with Application to Particle-Size Curves in Heterogeneous Aquifers
The original version of this article unfortunately contained a mistake. In ”Acknowledgment” the Grant Agreement No. was incorrect. The correct number is No. 636811.
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Article
Adaptive POD model reduction for solute transport in heterogeneous porous media
We study the applicability of a model order reduction technique to the solution of transport of passive scalars in homogeneous and heterogeneous porous media. Transport dynamics are modeled through the advecti...
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Article
Dimensionality reduction for efficient Bayesian estimation of groundwater flow in strongly heterogeneous aquifers
We focus on the Bayesian estimation of strongly heterogeneous transmissivity fields conditional on data sampled at a set of locations in an aquifer. Log-transmissivity, Y, is modeled as a stochastic Gaussian proc...
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Article
Uncertainty quantification of overpressure buildup through inverse modeling of compaction processes in sedimentary basins
This study illustrates a procedure conducive to a preliminary risk analysis of overpressure development in sedimentary basins characterized by alternating depositional events of sandstone and shale layers. The...
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Article
Characterization of Bimolecular Reactive Transport in Heterogeneous Porous Media
We characterize the role of preferential pathways in controlling the dynamics of bimolecular reactive transport in a representative model of a heterogeneous porous medium. We examine a suite of numerical simul...
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Article
Analytical expressions for three-phase generalized relative permeabilities in water- and oil-wet capillary tubes
We analyze three-phase flow of immiscible fluids taking place within an elementary capillary tube with circular cross-section under water- and oil-wet conditions. We account explicitly for momentum transfer be...
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Article
A Class-Kriging Predictor for Functional Compositions with Application to Particle-Size Curves in Heterogeneous Aquifers
This work addresses the problem of characterizing the spatial field of soil particle-size distributions within a heterogeneous aquifer system. The medium is conceptualized as a composite system, characterized ...
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Article
Statistical scaling of geometric characteristics in stochastically generated pore microstructures
We analyze the statistical scaling of structural attributes of virtual porous microstructures that are stochastically generated by thresholding Gaussian random fields. Characterization of the extent at which r...
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Chapter and Conference Paper
Alternative to Multifractal Analysis of Scalable Random Variables Applied to Measured and Estimated Soil Properties at an Arizona Field Site
Many earth, environmental, ecological, biological, physical, astrophysical and financial variables exhibit random space-time fluctuations; symmetric, non-Gaussian frequency distributions of increments characte...
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Chapter
Anisotropic Mesh and Time Step Adaptivity for Solute Transport Modeling in Porous Media
We assess the impact of space-time mesh adaptivity on the modeling of solute transport in porous media. This approach allows an automatic selection of both the spatial mesh and the time step on the basis of a ...
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Article
Three-Phase Permeabilities: Upscaling, Analytical Solutions and Uncertainty Analysis in Elementary Pore Structures
Immiscible three-phase flow in a rigid porous medium is upscaled from the pore to the continuum (Darcy) scale through homogenization relying on multiple scale expansion. We solve the Stokes flow problem at the...
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Article
A kriging approach based on Aitchison geometry for the characterization of particle-size curves in heterogeneous aquifers
We consider the problem of predicting the spatial field of particle-size curves (PSCs) from a sample observed at a finite set of locations within an alluvial aquifer near the city of Tübingen, Germany. We inte...
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Article
A reduced-order model for Monte Carlo simulations of stochastic groundwater flow
We explore the ability of the greedy algorithm to serve as an effective tool for the construction of reduced-order models for the solution of fully saturated groundwater flow in the presence of randomly distri...
