Mathematical methods are developed to solve this very challenging, ill-posed problem that has a variety of applications. Emphasis is placed on pollution source identification, paleo-climate inference through perched aquifer field data, and real-time atmospheric pollution tracking. People previously or currently involved are: Sandrine Baun, Eric Kenney, Dan Cornacchiulo, Dr. Juliana Atmadja (EarthTech), Tim Tolley, Professor Dave Miller (UConn), and Professor Rachid Ababou (Polytechnic University of Toulouse, France).	Inverse methods are applied for polarimetric radar calibration using rain gauge data. Advanced sampling techniques are employed for improving the computational efficiency in satelite-based rainfall prediction error propagation algorithms. People previously or currently involved are: Sandrine Baun, Marios Anagnostou, Professor Faisal Hossain (Tennesee Technological University), and Professor Manos Anagnostou (UConn).
Numerical and physical modeling is being conducted to study the effects of aperiodic external stresses (i.e., wells with oscillatory pumping schedules) on the mixing properties and thus on the remediation potential of ground water aquifers. People previously or currently involved are: Peter Oates (MIT), Elsa Loehmann, and Professor Rene Chevray (Columbia University).	Elements of chaos theory are applied to facilitate the design of estuarine, human intervention induced, modifications in order to manage and improve the water quality of estuaries. Numerical models that predict the ground water-surface water interactions are developed and tested with experimental data. People previously or currently involved are: Cathy Marcincevage (University of Illinois), Dr. Andrei Novikov (PANYNJ), and Dr. Fawaz Habel.
Research is conducted on various aspects of flow and transport processes in fractured, variably saturated media. Issues such as upscaling, tunnel ground water inflows, watershed management and dual-phase flows are being investigated. People previously or currently involved are: Farhad Nadim, Cary Talbot, Dan Cornacchiulo, Dr. Daniele Cesano, and Professor Rachid Ababou (Polytechnic University of Toulouse, France).	Numerical methods are developed and applied to a variety of problems, such as characterizing the spatial patterns of Arsenic in NW Bangladesh, enhancing resistivity inversion using kriging, hydrogeological data fusion, and (even) mortgage-based security assessment. People previously or currently involved are: Brian Tracy, Dan Cornacchiulo, Professor Faisal Hossain (Tennesee Technological University), John Lane (USGS), and Professor John Stiver (University of Notre Dame).