|2014 - Present||Research Professor Emeritus, Boise State University ‐ Department of Geosciences|
|2014 - Present||Research Professor Emeritus, Boise State University ‐ Center for Geophysical Investigation of the Shallow Subsurface (CGISS)|
|2012 - 2016||Visiting Professor, Stanford University ‐ Department of Civil and Environmental Engineering|
|1993 - 2014||Research Professor, Boise State University ‐ Department of Geosciences|
|1993 - 2014||Research Professor, Boise State University ‐ Center for Geophysical Investigation of the Shallow Subsurface (CGISS)|
|1989 - 1993||Hydrogeologist and Subsurface Program Manager, Idaho Department of Health and Welfare ‐ INEL Oversight Program|
|1988 - 1989||Hydrogeologist and Consulting Manager, In-Situ, Inc.|
|1987 - 1988||Research Hydrogeologist, Western Research Institute|
|1983 - 1987||Research Hydrogeologist, Nebraska Geological Survey|
|2009 - 2012||Boise State University: CMG Collaborative research: Subsurface imaging and uncertainty quantification|
|National Science Foundation|
|2009 - 2012||Boise State University: Measurement and modeling hydrologic fluxes and states from aquifer to atmosphere at multiple scales|
|Army Research Office|
|2007 - 2010||Boise State University: Collaborative research: Hydrogeophysical quantification of hydraulic conductivity from electrical measurements of the effective properties of porous media|
|National Science Foundation|
|2007 - 2010||Boise State University: Hydrogeophysical methods for environmental sensing research initiatives in hydrogeophysics and hydrogeochemistry|
|U.S. Environmental Protection Agency|
|2006 - 2009||Boise State University: Hydrogeophysical methods for quantitative site characterization and imaging of fluid flow and mass transport in the shallow subsurface|
|U.S. Environmental Protection Agency|
|2004 - 2006||Boise State University: Time-lapse imaging of fluid flow and contaminant transport in the shallow subsurface|
|U.S. Environmental Protection Agency|
|2003 - 2005||Boise State University: Subcontract to prime contractor Montana State University within: Assessment of geologic carbon sequestration potential for the Northern Rockies and Great Plains region|
|U.S. Department of Energy|
|2000 - 2003||Boise State University: High-resolution 3D sedimentary architecture and transport parameter distributions in heterogeneous alluvial deposits with georadar|
|Inland Northwest Research Alliance (Idaho National Engr. and Envir. Laboratory)|
|2000 - 2003||Boise State University: Research on inverse methods applied to geophysical and hydrologic field techniques in support of development of the Boise Hydrogeophysical Research Site|
|Army Research Office|
Professional Service and Affiliations
|Member, American Geophysical Union||Member, Association of Groundwater Scientists and Engineers (NGWA)||Member, Geological Society of America||Registered Professional Geologist, #805, Idaho Board of Registration||Member, International Association of Hydrological Sciences|
- Advanced Hydrogeology
- Applied Hydrogeology
- Hydrogeophysics Seminar
- Tectonics of the Pacific Northwest
|1986||Ph.D. - Geology, Whittenberger Fellow (1981-82), University of Idaho|
|1978||M.S. - Geology, University of Idaho|
|1970||B.A. - English, Honors Major, Dartmouth College|
Center for Geophysical Investigation of the Shallow Subsurface (CGISS) and Department of Geosciences
Boise State University, Boise, ID 83725
Includes peer-reviewed articles, map publications, published comments/responses, and errata
Statistical Analysis of Aquifer Hydraulic Properties by a Continuous Pumping Tomography Test: Application to the Boise Hydrogeophysical Research Site Water Resources Research (2022)
Characterizing aquifer heterogeneity is paramount for accurate flow and transport modeling. In this work, we present a new approach for statistical analysis of hydraulic properties in continuous pumping tomography tests of a phreatic aquifer. The ...
Comment on “Aquifer Characterization Using Fiber Bragg Grating Multi-Level Monitoring System” Groundwater (2022)
Wang et al. (2022) describe the fiber Bragg grating (FBG) optical fiber transducer technology for pressure sensing in hydrologic testing applications, and in particular, for hydraulic tomography (HT) testing. As part of their Introduction section, ...
Fiber Optic Pressure Measurements Open Up New Experimental Possibilities in Hydrogeology Groundwater (2022)
Fiber-optic (FO) technology is being used increasingly for measurement methods in a variety of environmental applications. However, FO pressure transducers are rarely used in hydrogeological applications. We review the current state of Fabry-Pérot interferometry-based FO ...
Aquifer Imaging with Oscillatory Hydraulic Tomography: Application at the Field Scale Groundwater (2020)
Modeling and laboratory experiments have demonstrated the ability of oscillatory hydraulic tomography (OHT) to characterize heterogeneity in aquifer hydraulic properties. In OHT, a location is stressed via periodic pumping/injection at a set frequency, and the ...
Hydraulic Tomography: 3D Hydraulic Conductivity, Fracture Network, and Connectivity in Mudstone Groundwater (2020)
We present the first demonstration of hydraulic tomography (HT) to estimate the three‐dimensional (3D) hydraulic conductivity (K) distribution of a fractured aquifer at high‐resolution field scale (HRFS), including the fracture network and connectivity through it. ...
The Hydrogeologic Information in Cross-Borehole Complex Conductivity Data from an Unconsolidated Conglomeratic Sedimentary Aquifer Geophysics (2016)
Accurate estimation of the hydrological properties of near-surface aquifers is important because these properties strongly influence groundwater flow and solute transport. Laboratory-based investigations have indicated that induced polarization (IP) properties of porous media may be ...
Frequency Dependent Hydraulic Properties Estimated from Oscillatory Pumping Tests in an Unconfined Aquifer Journal of Hydrology (2015)
Oscillatory pumping tests were conducted at the Boise Hydrogeophysical Research Site. A periodic pressure signal is generated by pumping and injecting water into the aquifer consecutively and the pressure response is recorded at many points ...
Analytical and Semi-Analytical Tools for the Design of Oscillatory Pumping Tests Groundwater (2015)
Oscillatory pumping tests—in which ﬂow is varied in a periodic fashion—provide a method for understanding aquifer heterogeneity that is complementary to strategies such as slug testing and constant-rate pumping tests. During oscillatory testing, pressure data ...
Hydraulic Tomography: Continuity and Discontinuity of High-K and Low-K Zones Groundwater (2015)
Hydraulic tomography is an emerging ﬁeld and modeling method that provides a continuous hydraulic conductivity (K) distribution for an investigated region. Characterization approaches that rely on interpolation between one-dimensional (1D) proﬁles have limited ability to ...
Electrical-Hydraulic Relationships Observed for Unconsolidated Sediments in the Presence of a Cobble Framework Water Resources Research (2014)
Mechanistic models now exist to predict hydraulic conductivity (K) from the spectral-induced polarization (SIP) response of granular media. We examined the predictions of such a model on unconsolidated coarse fluvial sediments and compared them to ...
Data Processing for Oscillatory Pumping Tests Journal of Hydrology (2014)
Characterizing the subsurface is important for many hydrogeologic projects such as site remediation and groundwater resource exploration. Methods based on the analysis of conventional pumping tests have the notable disadvantage that at a certain distance, ...
Estimating Unsaturated Hydraulic Functions for Coarse Sediment from a Field-Scale Infiltration Experiment Vadose Zone Journal (2014)
A field-scale infiltration experiment was conducted in coarse conglomeratic soil with high gravel fraction. Unsaturated flow properties were estimated from modeling of infiltration using the van Genuchten–Mualem model and a Metropolis–Hasting optimization scheme. Results provide ...
Estimating Hydrologic Parameters from Water Table Dynamics Using Coupled Hydrologic and Ground-Penetrating Radar Inversion 2014 15th International Conference on Ground Penetrating Radar (2014)
During water table drawdown the differential relationship between hydraulic conductivity and the distance above the water saturated zone (SZ) leads to delay in drainage and stretching of the transition zone. The ground-penetrating radar (GPR) reflection ...
Hydraulic Conductivity Imaging from 3-D Transient Hydraulic Tomography at Several Pumping/Observation Densities Water Resources Research (2013)
3-D Hydraulic tomography (3-D HT) is a method for aquifer characterization whereby the 3-D spatial distribution of aquifer flow parameters (primarily hydraulic conductivity, K) is estimated by joint inversion of head change data from multiple ...
Aquifer Heterogeneity Characterization with Oscillatory Pumping: Sensitivity Analysis and Imaging Potential Water Resources Research (2013)
 Periodic pumping tests, in which a fluid is extracted during half a period, then reinjected, have been used historically to estimate effective aquifer properties. In this work, we suggest a modified approach to periodic ...
Recognizing and Modeling Variable Drawdown Due to Evapotranspiration in a Semiarid Riparian Zone Considering Local Differences in Vegetation and Distance from a River Source Water Resources Research (2013)
Riparian zones in semiarid regions often exhibit high rates of evapotranspiration (ET) in spite of low-soil moisture content due to the presence of phreatophytic vegetation that is able to withdraw water from shallow aquifers. This ...
Three-Dimensional Stochastic Estimation of Porosity Distribution: Benefits of Using Ground-Penetrating Radar Velocity Tomograms in Simulated-Annealing-Based or Bayesian Sequential Simulation Approaches Water Resources Research (2012)
Estimation of the three-dimensional (3-D) distribution of hydrologic properties and related uncertainty is a key for improved predictions of hydrologic processes in the subsurface. However it is difficult to gain high-quality and high-density hydrologic information ...
A Field Proof-of-Concept of Aquifer Imaging Using 3-D Transient Hydraulic Tomography with Modular, Temporarily-Emplaced Equipment Water Resources Research (2012)
Hydraulic tomography is a field scale aquifer characterization method capable of estimating 3-D heterogeneous parameter distributions, and is directly sensitive to hydraulic conductivity (K), thus providing a useful data source for improving flow and transport ...
3-D Transient Hydraulic Tomography in Unconfined Aquifers with Fast Drainage Response Water Resources Research (2011)
We investigate, through numerical experiments, the viability of three-dimensional transient hydraulic tomography (3DTHT) for identifying the spatial distribution of groundwater flow parameters (primarily, hydraulic conductivity K) in permeable, unconfined aquifers. To invert the large amount ...
Hydrological Parameter Estimations from a Conservative Tracer Test with Variable-Density Effects at the Boise Hydrogeophysical Research Site Water Resources Research (2011)
Reliable predictions of groundwater flow and solute transport require an estimation of the detailed distribution of the parameters (e.g., hydraulic conductivity, effective porosity) controlling these processes. However, such parameters are difficult to estimate because of ...
Modeling Slug Tests in Unconfined Aquifers Taking into Account Water Table Kinematics, Wellbore Skin and Inertial Effects Journal of Hydrology (2011)
Two models for slug tests conducted in unconfined aquifers are developed by (a) extending the unconfined KGS solution to oscillatory responses, yielding a model referred to herein as the unified model, and (b) replacing the ...
Joint Inversion of Steady-State Hydrologic and Self-Potential Data for 3D Hydraulic Conductivity Distribution at the Boise Hydrogeophysical Research Site Journal of Hydrology (2011)
We combine sedimentological, hydraulic and geophysical information to characterize the 3D distribution of transport properties of an heterogeneous aquifer. We focus on the joint inversion of hydraulic head and self-potential measurements collected during an extensive ...
Information Content of Slug Tests for Estimating Hydraulic Properties in Realistic, High-Conductivity Aquifer Scenarios Journal of Hydrology (2011)
A recently developed unified model for partially-penetrating slug tests in unconfined aquifers (Malama et al., in press) provides a semi-analytical solution for aquifer response at the wellbore in the presence of inertial effects and wellbore ...
Inversion of Multiple Intersecting High-Resolution Crosshole GPR Profiles for Hydrological Characterization at the Boise Hydrogeophysical Research Site Journal of Applied Geophysics (2011)
The integration of geophysical data into the subsurface characterization problem has been shown in many cases to significantly improve hydrological knowledge by providing information at spatial scales and locations that is unattainable using conventional hydrological ...
Examining the Influence of Heterogeneous Porosity Fields on Conservative Solute Transport Journal of Contaminant Hydrology (2009)
It is widely recognized that groundwater flow and solute transport in natural media are largely controlled by heterogeneities. In the last three decades, many studies have examined the effects of heterogeneous hydraulic conductivity fields on ...