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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Educational webtool illustrating groundwater age effects on contaminant trends in wells Educational webtool illustrating groundwater age effects on contaminant trends in wells
No abstract available.
Authors
John Karl Böhlke, Bryant C. Jurgens, David J. Uselmann, Sandra M. Eberts
Accuracy of travel time distribution (TTD) models as affected by TTD complexity, observation errors, and model and tracer selection Accuracy of travel time distribution (TTD) models as affected by TTD complexity, observation errors, and model and tracer selection
Analytical models of the travel time distribution (TTD) from a source area to a sample location are often used to estimate groundwater ages and solute concentration trends. The accuracies of these models are not well known for geologically complex aquifers. In this study, synthetic datasets were used to quantify the accuracy of four analytical TTD models as affected by TTD complexity...
Authors
Christopher T. Green, Yong Zhang, Bryant C. Jurgens, J. Jeffrey Starn, Matthew K. Landon
Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s-2000s Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s-2000s
A regional assessment of multi-decadal changes in nitrate concentrations was done using historical data and a spatially stratified non-biased approach. Data were stratified into physiographic subregions on the basis of geomorphology and soils data to represent zones of historical recharge and discharge patterns in the basin. Data were also stratified by depth to represent a shallow zone...
Authors
Karen R. Burow, Bryant C. Jurgens, Kenneth Belitz, Neil M. Dubrovsky
Status and understanding of groundwater quality in the Madera, Chowchilla Study Unit, 2008: California GAMA Priority Basin Project Status and understanding of groundwater quality in the Madera, Chowchilla Study Unit, 2008: California GAMA Priority Basin Project
Groundwater quality in the approximately 860-square-mile Madera and Chowchilla Subbasins (Madera-Chowchilla study unit) of the San Joaquin Valley Basin was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The study unit is located in California's Central Valley region in parts of Madera, Merced, and Fresno Counties...
Authors
Jennifer L. Shelton, Miranda S. Fram, Kenneth Belitz, Bryant C. Jurgens
TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data
TracerLPM is an interactive Excel® (2007 or later) workbook program for evaluating groundwater age distributions from environmental tracer data by using lumped parameter models (LPMs). Lumped parameter models are mathematical models of transport based on simplified aquifer geometry and flow configurations that account for effects of hydrodynamic dispersion or mixing within the aquifer...
Authors
Bryant C. Jurgens, J.K. Böhlke, Sandra M. Eberts
Hydrogeology, water chemistry, and transport processes in the zone of contribution of a public-supply well in Albuquerque, New Mexico, 2007-9 Hydrogeology, water chemistry, and transport processes in the zone of contribution of a public-supply well in Albuquerque, New Mexico, 2007-9
The National Water-Quality Assessment Program (NAWQA) of the U.S. Geological Survey began a series of groundwater studies in 2001 in representative aquifers across the Nation in order to increase understanding of the factors that affect transport of anthropogenic and natural contaminants (TANC) to public-supply wells. One of 10 regional-scale TANC studies was conducted in the Middle Rio...
Authors
Laura M. Bexfield, Bryant C. Jurgens, Dianna M. Crilley, Scott C. Christenson
Science and Products
Filter Total Items: 21
No Result Found
Filter Total Items: 60
Educational webtool illustrating groundwater age effects on contaminant trends in wells Educational webtool illustrating groundwater age effects on contaminant trends in wells
No abstract available.
Authors
John Karl Böhlke, Bryant C. Jurgens, David J. Uselmann, Sandra M. Eberts
Accuracy of travel time distribution (TTD) models as affected by TTD complexity, observation errors, and model and tracer selection Accuracy of travel time distribution (TTD) models as affected by TTD complexity, observation errors, and model and tracer selection
Analytical models of the travel time distribution (TTD) from a source area to a sample location are often used to estimate groundwater ages and solute concentration trends. The accuracies of these models are not well known for geologically complex aquifers. In this study, synthetic datasets were used to quantify the accuracy of four analytical TTD models as affected by TTD complexity...
Authors
Christopher T. Green, Yong Zhang, Bryant C. Jurgens, J. Jeffrey Starn, Matthew K. Landon
Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s-2000s Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s-2000s
A regional assessment of multi-decadal changes in nitrate concentrations was done using historical data and a spatially stratified non-biased approach. Data were stratified into physiographic subregions on the basis of geomorphology and soils data to represent zones of historical recharge and discharge patterns in the basin. Data were also stratified by depth to represent a shallow zone...
Authors
Karen R. Burow, Bryant C. Jurgens, Kenneth Belitz, Neil M. Dubrovsky
Status and understanding of groundwater quality in the Madera, Chowchilla Study Unit, 2008: California GAMA Priority Basin Project Status and understanding of groundwater quality in the Madera, Chowchilla Study Unit, 2008: California GAMA Priority Basin Project
Groundwater quality in the approximately 860-square-mile Madera and Chowchilla Subbasins (Madera-Chowchilla study unit) of the San Joaquin Valley Basin was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The study unit is located in California's Central Valley region in parts of Madera, Merced, and Fresno Counties...
Authors
Jennifer L. Shelton, Miranda S. Fram, Kenneth Belitz, Bryant C. Jurgens
TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data
TracerLPM is an interactive Excel® (2007 or later) workbook program for evaluating groundwater age distributions from environmental tracer data by using lumped parameter models (LPMs). Lumped parameter models are mathematical models of transport based on simplified aquifer geometry and flow configurations that account for effects of hydrodynamic dispersion or mixing within the aquifer...
Authors
Bryant C. Jurgens, J.K. Böhlke, Sandra M. Eberts
Hydrogeology, water chemistry, and transport processes in the zone of contribution of a public-supply well in Albuquerque, New Mexico, 2007-9 Hydrogeology, water chemistry, and transport processes in the zone of contribution of a public-supply well in Albuquerque, New Mexico, 2007-9
The National Water-Quality Assessment Program (NAWQA) of the U.S. Geological Survey began a series of groundwater studies in 2001 in representative aquifers across the Nation in order to increase understanding of the factors that affect transport of anthropogenic and natural contaminants (TANC) to public-supply wells. One of 10 regional-scale TANC studies was conducted in the Middle Rio...
Authors
Laura M. Bexfield, Bryant C. Jurgens, Dianna M. Crilley, Scott C. Christenson