Funded by the U.S. Environmental Protection Agency:

Use of Borehole Geophysics for Groundwater Investigations at Hazardous Waste Sites (Co-Principal Investigator), funded for about $500K per year for three years.
Use borehole tools and interpretation strategies developed in previous project (described below) in field situations. Improve tools and strategies from information learned at field sites. Borehole information to be integrated to obtain spatial variability of hydrogeologic parameters for site. Information to be used in stochastic contaminant transport models. Systematic investigation of water quality sampling techniques in boreholes, addressing the question of how representative the borehole water is of the formation pore water.

Downhole Sensing Methods for Hazardous Waste Site Monitoring (Co-Principal Investigator), funded for about $300K per year for three years.
Survey existing methods for borehole logging and make recommendations for their use in groundwater investigations at hazardous waste sites. Develop new borehole tools and interpretation techniques specifically designed for shallow groundwater investigations. Conduct laboratory and field experiments on thermal groundwater flow meter.

Site Characterization for Hazardous Waste Sites, Principle Investigator, funded for $843K for three years.
Task A:
 Use of Fractal Methods for Generation of Synthetic Datasets and Scientific Visualization in the Modeling of Groundwater Flow and Transport, S. Tyler, Co-Principle Investigator. Development of fractal algorithms that reproduce important aspects of natural heterogeneity; development of gridding algorithms for sparse data for the purpose of using sparse data with scientific visualization software; development of computer graphic methods to simultaneously visualize 3-dimensional model input data (such as hydraulic conductivity) along with 3-dimensional transient output data from models.

Task B: Site Characterization for Hazardous Waste Sites Using Geophysical Methods, R. Bochicchio, Co-Principle Investigator. Field work using geophysical methods to help characterize hazardous waste sites at various places all over the country.

Geothermal Environmental Impact Assessment: An Approach to Monitoring Groundwater Impacts from Development, Conversion and Waste Disposal (Co-Principal Investigator), funded for about $125K per year for three years.
Overall project objective was to develop a systematized groundwater monitoring methodology for aquifers that are potentially affected by geothermal resource development.

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Funded by the U.S. National Science Foundation:

Collaborative Research: Stochastic Methods for Fractional Partial Differential Equations, funded for $992K (UNR $564K, DRI $428K), for three years.
Co-Principal Investigators: David Benson (DRI) Mark Meerschaert, (UNR Math Dept), Stephen Wheatcraft, (UNR Geological Sciences). Development of the stochastic theory of fractional advection-dispersion.

Investigation of Fractional-Order, Non-Gaussian Solute Transport, funded for $390K for three years.
Co-Principal Investigators: David Benson (DRI) , Mark Meerschaert (UNR Math Dept), Stephen Wheatcraft, (UNR Geological Sciences). Further development of the theory of fractional advection-dispersion.

A Physico-Chemical Approach to the Development of Salt Water Intrusion Models, Co-Principal Investigator, funded for $155K for two years.
Development of new models for density-coupled transport processes that improve on the interaction between density coupling and diffusion and dispersion processes. Includes development of theoretical, numerical and laboratory models. Physical models are intended to provide verification data sets useful for numerical model validation.

Funded by the U.S. Department of Energy:

A Chaotic-Dynamical Conceptual Model to Describe Fluid Flow and Contaminant Transport in a Fractured Vadose Zone, Principal Investigator, funded for $180K for three years.
Joint project with Lawrence Berkeley Lab and Idaho National Engineering Lab to develop chaotic-dynamical models of unsaturated fracture flow, test them in the laboratory and at a field site in Idaho.

Salt Water Intrusion Modeling of Amchitka Island, Alaska, Principal Investigator, funded for $14,700 for one year.
Development of a density-coupled flow and transport model of the groundwater system on Amchitka Island, Alaska.

Examination of the Fractal Characteristics of Solute Transport in Porous Media with Field Scale Heterogeneity (Co-Principal Investigator), funded at about $200K per year for three years.
Examination of the fractal nature of aquifer heterogeneity. Interpretation of dispersion problems with respect to fractal geometry. Fractal nature of fracture flow and transport in tuffs at Yucca Mountain. Examination of basic transport theory in porous media in light of fractal geometry.

Radionuclide Migration - Nevada Test Site (NTS) (Principal Investigator), funded for six years, at about $120K per year.
Develop 3-d model of tritium and Chloride-36 transport from a nuclear explosion cavity to a pumping well, based on field study in Frenchman Flat, NTS. Develop model of variably-saturated flow beneath 2-d vertical line source of infiltration from canal at same site. Determine tritium transport times from canal to saturated zone and recirculation effects to 3-d model.

Marshall Islands Groundwater Hydrology (Principal Investigator), funded for about $65K, for three years.
Describe and define quantitatively the groundwater hydraulics of small atoll islands for purposes of predicting radionuclide transport and development of water supply. Development of predictive model of groundwater system, including tidal responses. Development of new D.C. resistivity techniques for determination of salinity vs. depth for accurate delineation of fresh-water lens and transition zone.