Barbara J Mahler (Former Employee)
Science and Products
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Statistical analysis of major ion and trace element geochemistry of water, 1986-2006, at seven wells transecting the freshwater/saline-water interface of the Edwards aquifer, San Antonio, Texas Statistical analysis of major ion and trace element geochemistry of water, 1986-2006, at seven wells transecting the freshwater/saline-water interface of the Edwards aquifer, San Antonio, Texas
This report by the U.S. Geological Survey, in cooperation with the San Antonio Water System, describes the results of a statistical analysis of major ion and trace element geochemistry of water at seven wells transecting the freshwater/saline-water interface of the Edwards aquifer in San Antonio, Texas, either over time or in response to variations in hydrologic conditions. The data used...
Authors
Barbara Mahler
Chemical constituents in sediment in Lake Pontchartrain and in street mud and canal sediment in New Orleans, Louisiana, following Hurricanes Katrina and Rita, 2005 Chemical constituents in sediment in Lake Pontchartrain and in street mud and canal sediment in New Orleans, Louisiana, following Hurricanes Katrina and Rita, 2005
Samples of street mud, suspended and bottom sediment in canals discharging to Lake Ponchartrain, and suspended and bottom sediment in the lake were collected and analyzed for chemical constituents to help evaluate the effects of Hurricanes Katrina and Rita and the subsequent unwatering of New Orleans, Louisiana. The approach used for sampling and analysis of chemical data for the study...
Authors
Peter C. Van Metre, Jennifer T. Wilson, Arthur J. Horowitz, Stanley C. Skrobialowski, William T. Foreman, Christopher C. Fuller, Mark R. Burkhardt, Kent A. Elrick, Barbara Mahler, James J. Smith, Steven D. Zaugg
Relation of specific conductance in ground water to intersection of flow paths by wells, and associated major ion and nitrate geochemistry, Barton Springs Segment of the Edwards Aquifer, Austin, Texas, 1978-2003 Relation of specific conductance in ground water to intersection of flow paths by wells, and associated major ion and nitrate geochemistry, Barton Springs Segment of the Edwards Aquifer, Austin, Texas, 1978-2003
Understanding of karst flow systems can be complicated by the presence of solution-enlarged conduits, which can transmit large volumes of water through the aquifer rapidly. If the geochemistry at a well can be related to streamflow or spring discharge (springflow), or both, the relations can indicate the presence of recent recharge in water at the well, which in turn might indicate that...
Authors
Bradley D. Garner, Barbara Mahler
Sediment and sediment-associated contaminant transport through karst Sediment and sediment-associated contaminant transport through karst
The unusual characteristics of subterranean flow in karst aquifers allow for the transport of sediment. Kartst ground-water system are created by dissolution of the bedrock matrix coupled with structural and stratigraphic controls. As a result, high flow velocities, large-diameter openings, and turbulent flow, all necessary for the entrainment and transport of particles, are present—at...
Authors
Barbara Mahler, J.-C. Personne, F. Leo Lynch, Peter C. Van Metre
Anthropogenic contaminants as tracers in an urbanizing karst aquifer Anthropogenic contaminants as tracers in an urbanizing karst aquifer
Karst aquifers are uniquely vulnerable to contamination. In the Barton Springs segment of the karstic Edwards aquifer (Texas, U.S.A.), urban contaminants such as pesticides and volatile organic compounds frequently are detected in spring base flow. To determine whether contaminant concentrations change in response to storms, and if they therefore might act as tracers of focused recharge...
Authors
B. Mahler, N. Massei
Effects of Hurricanes Katrina and Rita on the chemistry of bottom sediments in Lake Pontchartrain, La. Effects of Hurricanes Katrina and Rita on the chemistry of bottom sediments in Lake Pontchartrain, La.
Concerns about the effect of pumping contaminated flood waters into Lake Pontchartrain following the hurricanes of 2005 prompted the U.S. Geological Survey (USGS) to sample street mud, canal-suspended sediment, and bottom sediment in Lake Pontchartain. The samples were analyzed for a wide variety of potential inorganic and organic contaminants. Results indicate that contamination of lake...
Authors
Peter C. Van Metre, Arthur J. Horowitz, Barbara Mahler, William T. Foreman, Christopher C. Fuller, Mark R. Burkhardt, Kent A. Elrick, Edward T. Furlong, Stanley C. Skrobialowski, James J. Smith, Jennifer T. Wilson, Stephen D. Zaugg
Science and Products
Filter Total Items: 13
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Filter Total Items: 24
No results found.
Filter Total Items: 106
Statistical analysis of major ion and trace element geochemistry of water, 1986-2006, at seven wells transecting the freshwater/saline-water interface of the Edwards aquifer, San Antonio, Texas Statistical analysis of major ion and trace element geochemistry of water, 1986-2006, at seven wells transecting the freshwater/saline-water interface of the Edwards aquifer, San Antonio, Texas
This report by the U.S. Geological Survey, in cooperation with the San Antonio Water System, describes the results of a statistical analysis of major ion and trace element geochemistry of water at seven wells transecting the freshwater/saline-water interface of the Edwards aquifer in San Antonio, Texas, either over time or in response to variations in hydrologic conditions. The data used...
Authors
Barbara Mahler
Chemical constituents in sediment in Lake Pontchartrain and in street mud and canal sediment in New Orleans, Louisiana, following Hurricanes Katrina and Rita, 2005 Chemical constituents in sediment in Lake Pontchartrain and in street mud and canal sediment in New Orleans, Louisiana, following Hurricanes Katrina and Rita, 2005
Samples of street mud, suspended and bottom sediment in canals discharging to Lake Ponchartrain, and suspended and bottom sediment in the lake were collected and analyzed for chemical constituents to help evaluate the effects of Hurricanes Katrina and Rita and the subsequent unwatering of New Orleans, Louisiana. The approach used for sampling and analysis of chemical data for the study...
Authors
Peter C. Van Metre, Jennifer T. Wilson, Arthur J. Horowitz, Stanley C. Skrobialowski, William T. Foreman, Christopher C. Fuller, Mark R. Burkhardt, Kent A. Elrick, Barbara Mahler, James J. Smith, Steven D. Zaugg
Relation of specific conductance in ground water to intersection of flow paths by wells, and associated major ion and nitrate geochemistry, Barton Springs Segment of the Edwards Aquifer, Austin, Texas, 1978-2003 Relation of specific conductance in ground water to intersection of flow paths by wells, and associated major ion and nitrate geochemistry, Barton Springs Segment of the Edwards Aquifer, Austin, Texas, 1978-2003
Understanding of karst flow systems can be complicated by the presence of solution-enlarged conduits, which can transmit large volumes of water through the aquifer rapidly. If the geochemistry at a well can be related to streamflow or spring discharge (springflow), or both, the relations can indicate the presence of recent recharge in water at the well, which in turn might indicate that...
Authors
Bradley D. Garner, Barbara Mahler
Sediment and sediment-associated contaminant transport through karst Sediment and sediment-associated contaminant transport through karst
The unusual characteristics of subterranean flow in karst aquifers allow for the transport of sediment. Kartst ground-water system are created by dissolution of the bedrock matrix coupled with structural and stratigraphic controls. As a result, high flow velocities, large-diameter openings, and turbulent flow, all necessary for the entrainment and transport of particles, are present—at...
Authors
Barbara Mahler, J.-C. Personne, F. Leo Lynch, Peter C. Van Metre
Anthropogenic contaminants as tracers in an urbanizing karst aquifer Anthropogenic contaminants as tracers in an urbanizing karst aquifer
Karst aquifers are uniquely vulnerable to contamination. In the Barton Springs segment of the karstic Edwards aquifer (Texas, U.S.A.), urban contaminants such as pesticides and volatile organic compounds frequently are detected in spring base flow. To determine whether contaminant concentrations change in response to storms, and if they therefore might act as tracers of focused recharge...
Authors
B. Mahler, N. Massei
Effects of Hurricanes Katrina and Rita on the chemistry of bottom sediments in Lake Pontchartrain, La. Effects of Hurricanes Katrina and Rita on the chemistry of bottom sediments in Lake Pontchartrain, La.
Concerns about the effect of pumping contaminated flood waters into Lake Pontchartrain following the hurricanes of 2005 prompted the U.S. Geological Survey (USGS) to sample street mud, canal-suspended sediment, and bottom sediment in Lake Pontchartain. The samples were analyzed for a wide variety of potential inorganic and organic contaminants. Results indicate that contamination of lake...
Authors
Peter C. Van Metre, Arthur J. Horowitz, Barbara Mahler, William T. Foreman, Christopher C. Fuller, Mark R. Burkhardt, Kent A. Elrick, Edward T. Furlong, Stanley C. Skrobialowski, James J. Smith, Jennifer T. Wilson, Stephen D. Zaugg