Bryant C Jurgens
Groundwater is an important source of drinking water in the United States. In order to assess the status and long-term sustainability of this important resource, I use environmental tracers, geochemical modeling, and statistical methods to understand the age structure, geochemical processes, and trends affecting water-quality in aquifers.
Science and Products
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Large decadal-scale changes in uranium and bicarbonate in groundwater of the irrigated western U.S Large decadal-scale changes in uranium and bicarbonate in groundwater of the irrigated western U.S
Samples collected about one decade apart from 1105 wells from across the U.S. were compiled to assess whether uranium concentrations in the arid climate are linked to changing bicarbonate concentrations in the irrigated western U.S. Uranium concentrations in groundwater were high in the arid climate in the western U.S, where uranium sources are abundant. Sixty-four wells (6%) were above...
Authors
Karen R. Burow, Kenneth Belitz, Neil M. Dubrovsky, Bryant C. Jurgens
Potential corrosivity of untreated groundwater in the United States Potential corrosivity of untreated groundwater in the United States
Corrosive groundwater, if untreated, can dissolve lead and other metals from pipes and other components in water distribution systems. Two indicators of potential corrosivity—the Langelier Saturation Index (LSI) and the Potential to Promote Galvanic Corrosion (PPGC)—were used to identify which areas in the United States might be more susceptible to elevated concentrations of metals in...
Authors
Kenneth Belitz, Bryant C. Jurgens, Tyler D. Johnson
A partial exponential lumped parameter model to evaluate groundwater age distributions and nitrate trends in long-screened wells A partial exponential lumped parameter model to evaluate groundwater age distributions and nitrate trends in long-screened wells
A partial exponential lumped parameter model (PEM) was derived to determine age distributions and nitrate trends in long-screened production wells. The PEM can simulate age distributions for wells screened over any finite interval of an aquifer that has an exponential distribution of age with depth. The PEM has 3 parameters – the ratio of saturated thickness to the top and bottom of the...
Authors
Bryant C. Jurgens, John Karl Bohlke, Leon J. Kauffman, Kenneth Belitz, Bradley K. Esser
Regional oxygen reduction and denitrification rates in groundwater from multi-model residence time distributions, San Joaquin Valley, USA Regional oxygen reduction and denitrification rates in groundwater from multi-model residence time distributions, San Joaquin Valley, USA
Rates of oxygen and nitrate reduction are key factors in determining the chemical evolution of groundwater. Little is known about how these rates vary and covary in regional groundwater settings, as few studies have focused on regional datasets with multiple tracers and methods of analysis that account for effects of mixed residence times on apparent reaction rates. This study provides...
Authors
Christopher T. Green, Bryant C. Jurgens, Yong Zhang, Jeffrey Starn, Michael J. Singleton, Bradley K. Esser
Effects of seasonal operation on the quality of water produced by public-supply wells Effects of seasonal operation on the quality of water produced by public-supply wells
Seasonal variability in groundwater pumping is common in many places, but resulting effects of seasonal pumping stress on the quality of water produced by public-supply wells are not thoroughly understood. Analysis of historical water-quality samples from public-supply wells completed in deep basin-fill aquifers in Modesto, California (134 wells) and Albuquerque, New Mexico (95 wells)...
Authors
Laura M. Bexfield, Bryant C. Jurgens
A ternary age-mixing model to explain contaminant occurrence in a deep supply well A ternary age-mixing model to explain contaminant occurrence in a deep supply well
The age distribution of water from a public-supply well in a deep alluvial aquifer was estimated and used to help explain arsenic variability in the water. The age distribution was computed using a ternary mixing model that combines three lumped parameter models of advection-dispersion transport of environmental tracers, which represent relatively recent recharge (post- 1950s) containing...
Authors
Bryant C. Jurgens, Laura M. Bexfield, Sandra M. Eberts
Science and Products
Filter Total Items: 21
No Result Found
Filter Total Items: 60
Large decadal-scale changes in uranium and bicarbonate in groundwater of the irrigated western U.S Large decadal-scale changes in uranium and bicarbonate in groundwater of the irrigated western U.S
Samples collected about one decade apart from 1105 wells from across the U.S. were compiled to assess whether uranium concentrations in the arid climate are linked to changing bicarbonate concentrations in the irrigated western U.S. Uranium concentrations in groundwater were high in the arid climate in the western U.S, where uranium sources are abundant. Sixty-four wells (6%) were above...
Authors
Karen R. Burow, Kenneth Belitz, Neil M. Dubrovsky, Bryant C. Jurgens
Potential corrosivity of untreated groundwater in the United States Potential corrosivity of untreated groundwater in the United States
Corrosive groundwater, if untreated, can dissolve lead and other metals from pipes and other components in water distribution systems. Two indicators of potential corrosivity—the Langelier Saturation Index (LSI) and the Potential to Promote Galvanic Corrosion (PPGC)—were used to identify which areas in the United States might be more susceptible to elevated concentrations of metals in...
Authors
Kenneth Belitz, Bryant C. Jurgens, Tyler D. Johnson
A partial exponential lumped parameter model to evaluate groundwater age distributions and nitrate trends in long-screened wells A partial exponential lumped parameter model to evaluate groundwater age distributions and nitrate trends in long-screened wells
A partial exponential lumped parameter model (PEM) was derived to determine age distributions and nitrate trends in long-screened production wells. The PEM can simulate age distributions for wells screened over any finite interval of an aquifer that has an exponential distribution of age with depth. The PEM has 3 parameters – the ratio of saturated thickness to the top and bottom of the...
Authors
Bryant C. Jurgens, John Karl Bohlke, Leon J. Kauffman, Kenneth Belitz, Bradley K. Esser
Regional oxygen reduction and denitrification rates in groundwater from multi-model residence time distributions, San Joaquin Valley, USA Regional oxygen reduction and denitrification rates in groundwater from multi-model residence time distributions, San Joaquin Valley, USA
Rates of oxygen and nitrate reduction are key factors in determining the chemical evolution of groundwater. Little is known about how these rates vary and covary in regional groundwater settings, as few studies have focused on regional datasets with multiple tracers and methods of analysis that account for effects of mixed residence times on apparent reaction rates. This study provides...
Authors
Christopher T. Green, Bryant C. Jurgens, Yong Zhang, Jeffrey Starn, Michael J. Singleton, Bradley K. Esser
Effects of seasonal operation on the quality of water produced by public-supply wells Effects of seasonal operation on the quality of water produced by public-supply wells
Seasonal variability in groundwater pumping is common in many places, but resulting effects of seasonal pumping stress on the quality of water produced by public-supply wells are not thoroughly understood. Analysis of historical water-quality samples from public-supply wells completed in deep basin-fill aquifers in Modesto, California (134 wells) and Albuquerque, New Mexico (95 wells)...
Authors
Laura M. Bexfield, Bryant C. Jurgens
A ternary age-mixing model to explain contaminant occurrence in a deep supply well A ternary age-mixing model to explain contaminant occurrence in a deep supply well
The age distribution of water from a public-supply well in a deep alluvial aquifer was estimated and used to help explain arsenic variability in the water. The age distribution was computed using a ternary mixing model that combines three lumped parameter models of advection-dispersion transport of environmental tracers, which represent relatively recent recharge (post- 1950s) containing...
Authors
Bryant C. Jurgens, Laura M. Bexfield, Sandra M. Eberts