Research interests:
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analytical and numerical techniques for simulation of flow/transport in saturated/unsaturated, porous/fractured media;
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development of regional/site scale conceptual and numerical models; evaluation of conceptual model uncertainties; ontological trees;
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parameter estimation; characterization of heterogeneity of subsurface flow medium; high-resolution stochastic imaging (tomography); stochastic inverse analysis; geostatistical and Monte-Carlo Markov-Chain methods;
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scale effects in properties of porous/fractured media; Lévy (alpha-stable) distributions; fractal formalism;
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subsurface fluid dynamics and contaminant transport; well hydraulics; exploration and protection of groundwater resources; design of groundwater-supply systems; capture-zone analyses;
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decision support, model-based decision making, impact evaluation of uncertainties on decision making; risk assessment;
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quantification of uncertainty associated with estimates, predictions, and conceptual model elements;
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model selection; model ranking; Maximum Likelihood Bayesian Averaging (MLBA); Generalized Likelihood Uncertainty Estimation (GLUE);
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evaluation of information content; data-worth analyses; global sensitivity and uncertainty analyses;
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optimal design of environmental management activities (characterization, data acquisition; remediation; monitoring); experiment design aiming reduction of data gaps and uncertainties; optimal design of monitoring networks; decision trees;
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General Information Theory (GIT); Fuzzy sets; Rough sets; Bayesian techniques; Information Gap Decision Theory; Bayesian Information Gap (BIG) Decision Theory;
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single- and multi-objective optimization methods; global/local techniques; Levenberg-Marquardt and Particle Swarm methods;
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model abstraction; model reduction; response surfaces; machine learning; reduced order modeling; support vector machines, support vector regression, non-negative matrix factorization; blind source separation; big-data analytics;
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high-performance programming, computing and parallelization using heterogeneous multi-processor clusters (supercomputers); code development