Bryant C. Jurgens
YOU?
Author Swipe
View article: The Systematics of Stable Hydrogen (δ<sup>2</sup>H) and Oxygen (δ<sup>18</sup>O) Isotopes and Tritium (<sup>3</sup>H) in the Hydrothermal System of the Yellowstone Plateau Volcanic Field, USA
The Systematics of Stable Hydrogen (δ<sup>2</sup>H) and Oxygen (δ<sup>18</sup>O) Isotopes and Tritium (<sup>3</sup>H) in the Hydrothermal System of the Yellowstone Plateau Volcanic Field, USA Open
To improve our understanding of hydrothermal activity on the Yellowstone Plateau volcanic field, we collected and analyzed a large data set of δ 2 H, δ 18 O, and the 3 H concentrations of circum‐neutral and alkaline waters. We find that (a…
View article: Basin‐scale responses of groundwater‐resource quality to drought and recovery, San Joaquin Valley, California
Basin‐scale responses of groundwater‐resource quality to drought and recovery, San Joaquin Valley, California Open
Groundwater‐resource quality is assumed to be less responsive to drought compared to that of surface water due to relatively long transit times of recharge to drinking‐supply wells. Here, we evidence dynamic perturbations in aquifer pressu…
View article: Correction to “Salinity Trends in a Groundwater System Supplemented by 50 Years of Imported Colorado River Water”
Correction to “Salinity Trends in a Groundwater System Supplemented by 50 Years of Imported Colorado River Water” Open
[This corrects the article DOI: 10.1021/acsestwater.3c00239.].
View article: Salinity Trends in a Groundwater System Supplemented by 50 Years of Imported Colorado River Water
Salinity Trends in a Groundwater System Supplemented by 50 Years of Imported Colorado River Water Open
The Indio subbasin of the Coachella Valley is a desert area of southern California where a growing population depends primarily on groundwater for drinking and agricultural uses. The aquifer system has been supplemented with Colorado River…
View article: Karst Groundwater Vulnerability Determined by Modeled Age and Residence Time Tracers
Karst Groundwater Vulnerability Determined by Modeled Age and Residence Time Tracers Open
Karst aquifers are a vital groundwater resource globally, but features such as rapid recharge and conduit flow make them highly vulnerable to land‐surface contamination. We apply environmental age tracers to the south‐central Texas Edwards…
View article: Over a third of groundwater in USA public-supply aquifers is Anthropocene-age and susceptible to surface contamination
Over a third of groundwater in USA public-supply aquifers is Anthropocene-age and susceptible to surface contamination Open
The distribution of groundwater age is useful for evaluating the susceptibility and sustainability of groundwater resources. Here, we compute the aquifer-scale cumulative distribution function to characterize the age distribution for 21 Pr…
View article: Effects of imported recharge on fluoride trends in groundwater used for public supply in California
Effects of imported recharge on fluoride trends in groundwater used for public supply in California Open
Fluoride is a naturally occurring element in groundwater that supports bone and dental health at low concentrations but can cause health problems at elevated concentrations in drinking water. This study investigates spatial and temporal tr…
View article: Critical Aquifer Overdraft Accelerates Degradation of Groundwater Quality in California's Central Valley During Drought
Critical Aquifer Overdraft Accelerates Degradation of Groundwater Quality in California's Central Valley During Drought Open
Drought‐induced pumpage has precipitated dramatic groundwater‐level declines in California's Central Valley over the past 30 yr, but the impacts of aquifer overdraft on water quality are poorly understood. This study coupled over 160,000 m…
View article: Groundwater residence time estimates obscured by anthropogenic carbonate
Groundwater residence time estimates obscured by anthropogenic carbonate Open
In central California, irrigation seepage perturbs groundwater inorganic carbon chemistry and complicates radiocarbon dating.
View article: A multi-tracer and well-bore flow profile approach to determine occurrence, movement, and sources of perchlorate in groundwater
A multi-tracer and well-bore flow profile approach to determine occurrence, movement, and sources of perchlorate in groundwater Open
The purpose of this study is to determine the occurrence, movement, and sources of perchlorate in groundwater using a comprehensive set of environmental tracers coupled with discrete borehole data. Potential sources of perchlorate to groun…
View article: Groundwater development leads to decreasing arsenic concentrations in the San Joaquin Valley, California
Groundwater development leads to decreasing arsenic concentrations in the San Joaquin Valley, California Open
In the San Joaquin Valley (SJV), California, about 10% of drinking water wells since 2010 had arsenic concentrations above the US maximum contaminant level of 10 μg/L. High concentrations of arsenic are often associated with high pH (great…
View article: Identifying areas of degrading and improving groundwater-quality conditions in the State of California, USA, 1974–2014
Identifying areas of degrading and improving groundwater-quality conditions in the State of California, USA, 1974–2014 Open
Areas of improving and degrading groundwater-quality conditions in the State of California were assessed using spatial weighting of a new metric for scoring wells based on constituent concentrations and the direction and magnitude of a tre…
View article: DGMETA (version 1)—Dissolved gas modeling and environmental tracer analysis computer program
DGMETA (version 1)—Dissolved gas modeling and environmental tracer analysis computer program Open
First posted January 8, 2021 For additional information, contact: NAWQA Science TeamU.S. Geological Survey12201 Sunrise Valley Drive, MS 413Reston, VA 20192–0002 DGMETA (Dissolved Gas Modeling and Environmental Tracer Analysis) is a Micros…
View article: Time scales of arsenic variability and the role of high-frequency monitoring at three water-supply wells in New Hampshire, USA
Time scales of arsenic variability and the role of high-frequency monitoring at three water-supply wells in New Hampshire, USA Open
Groundwater geochemistry, redox process classification, high-frequency physicochemical and hydrologic measurements, and climate data were analyzed to identify controls on arsenic (As) concentration changes. Groundwater was monitored in two…
View article: Arsenic variability and groundwater age in three water supply wells in southeast New Hampshire
Arsenic variability and groundwater age in three water supply wells in southeast New Hampshire Open
View article: Tritium as an indicator of modern, mixed, and premodern groundwater age
Tritium as an indicator of modern, mixed, and premodern groundwater age Open
First posted September 4, 2019 For additional information, contact: Chief Scientist, NAWQAU.S. Geological Survey2201 Sunrise Valley Drive, MS 413Reston, VA 20192-0002 Categorical classification of groundwater age is often used for the asse…
View article: Delineation of spatial extent, depth, thickness, and potential volume of aquifers used for domestic and public water-supply in the Central Valley, California
Delineation of spatial extent, depth, thickness, and potential volume of aquifers used for domestic and public water-supply in the Central Valley, California Open
First posted September 5, 2019 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 Identification of the groundwater resources used for d…
View article: Quantifying anthropogenic contributions to century-scale groundwater salinity changes, San Joaquin Valley, California, USA
Quantifying anthropogenic contributions to century-scale groundwater salinity changes, San Joaquin Valley, California, USA Open
Total dissolved solids (TDS) concentrations in groundwater tapped for beneficial uses (drinking water, irrigation, freshwater industrial) have increased on average by about 100 mg/L over the last 100 years in the San Joaquin Valley, Califo…
View article: Hydrogeologic controls and geochemical indicators of groundwater movement in the Niles Cone and southern East Bay Plain groundwater subbasins, Alameda County, California
Hydrogeologic controls and geochemical indicators of groundwater movement in the Niles Cone and southern East Bay Plain groundwater subbasins, Alameda County, California Open
First posted February 1, 2018 Revised February 1, 2019 For additional information, contact: Director, California Water Science Center6000 J Street, Placer HallSacramento, CA 95819 Beginning in the 1970s, Alameda County Water District began…
View article: Tritium deposition in precipitation in the United States, 1953–2012
Tritium deposition in precipitation in the United States, 1953–2012 Open
First posted August 1, 2018 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 Tritium is a radioactive isotope of hydrogen (half-life i…
View article: Regional Variability of Nitrate Fluxes in the Unsaturated Zone and Groundwater, Wisconsin,<scp>USA</scp>
Regional Variability of Nitrate Fluxes in the Unsaturated Zone and Groundwater, Wisconsin,<span>USA</span> Open
Process‐based modeling of regional fluxes to groundwater is critical for understanding and managing water quality, but the complexity of reactive transport processes makes implementation a challenge. This study introduces a regional vertic…
View article: ARSENIC VARIABILITY AND GEOCHEMICAL TIME SERIES AT A DOMESTIC BEDROCK WELL IN SOUTHEAST NEW HAMPSHIRE
ARSENIC VARIABILITY AND GEOCHEMICAL TIME SERIES AT A DOMESTIC BEDROCK WELL IN SOUTHEAST NEW HAMPSHIRE Open
Various (5+) fracture zones• Generally, >100 feet depth
View article: Radium mobility and the age of groundwater in public-drinking-water supplies from the Cambrian-Ordovician aquifer system, north-central USA
Radium mobility and the age of groundwater in public-drinking-water supplies from the Cambrian-Ordovician aquifer system, north-central USA Open
High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers (3H, 3Hetrit, SF6, 14C and 4Herad) of groundwater age from 80 public-s…
View article: A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA
A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA Open
Intense demand for water in the Central Valley of California and related increases in groundwater nitrate concentration threaten the sustainability of the groundwater resource. To assess contamination risk in the region, we developed a hyb…
View article: Using groundwater age distributions to understand changes in methyl tert-butyl ether (MtBE) concentrations in ambient groundwater, northeastern United States
Using groundwater age distributions to understand changes in methyl tert-butyl ether (MtBE) concentrations in ambient groundwater, northeastern United States Open
View article: 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 Open
View article: Potential corrosivity of untreated groundwater in the United States
Potential corrosivity of untreated groundwater in the United States Open
First posted July 12, 2016 For additional information, contact: Chief Scientist, National Water-Quality Assessment (NAWQA) Project U.S. Geological Survey Denver Federal Center West 6th Avenue and Kipling Street Lakewood, CO 80225 http://wa…