John Karl Bohlke
U.S. Geological Survey, Reston, VA
Activity
2017
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WATER-QUALITY RESULTS FROM THREE CHESAPEAKE BAY SHOWCASE WATERSHEDS: MONITORING AND ANALYSIS DESIGNED TO ASSESS AND INFORM RESTORATION
1 From Mountains to Coast: Biogeochemical Processes Affecting the Water Quality of the Bay in Our BackyardThursday, 30 March 20178:00 AM - 12:00 PMPotomac G
2016
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TRACKING “LAKE SHADOWS”: DISTRIBUTION AND WATER-QUALITY IMPLICATIONS OF LAKE-WATER RECHARGE ON GROUNDWATER DOWNGRADIENT FROM GLACIAL KETTLE LAKES ON CAPE COD, MASSACHUSETTS
T189 Interaction of Physical and Biogeochemical Processes at Groundwater–Surface-Water Interfaces in Rivers, Lakes, Estuaries, and Coastal Marine SettingsTuesday, 27 September 20168:00 AM - 12:00 PMRoom 501
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IN SITU DETERMINATION OF THE FATE AND FLUX OF NITRATE IN GROUNDWATER AS IT DISCHARGES THROUGH THE SURFACE SEDIMENTS INTO A GROUNDWATER FLOW-THROUGH LAKE ON WESTERN CAPE COD, MA
T250 Interaction of Physical and Biogeochemical Processes at Groundwater–Surface-Water Interfaces in Rivers, Lakes, Estuaries, and Coastal Marine Settings (Posters)Tuesday, 27 September 20169:00 AM - 6:30 PMExhibit Hall E/F
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THE FATE AND TRANSPORT OF DISSOLVED OXYGEN, INORGANIC NITROGEN AND ORGANIC CARBON DURING RECHARGE TO GROUNDWATER FROM A KETTLE LAKE ON CAPE COD, MA
T250 Interaction of Physical and Biogeochemical Processes at Groundwater–Surface-Water Interfaces in Rivers, Lakes, Estuaries, and Coastal Marine Settings (Posters)Tuesday, 27 September 20169:00 AM - 6:30 PMExhibit Hall E/F
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HYDROLOGIC AND BIOGEOCHEMICAL CONTROLS ON NITRATE MASS TRANSFER FROM CONTAMINATED GROUNDWATER INTO A GROUNDWATER FLOW-THROUGH LAKE ON CAPE COD, MA
T250 Interaction of Physical and Biogeochemical Processes at Groundwater–Surface-Water Interfaces in Rivers, Lakes, Estuaries, and Coastal Marine Settings (Posters)Tuesday, 27 September 20169:00 AM - 6:30 PMExhibit Hall E/F
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MODELING THE EFFECT OF TEMPERATURE VARIABILITY ON GROUNDWATER ARSENIC PLUMES DOWNGRADIENT OF EUTROPHIC LAKES
T134 Cycling of Arsenic and Other Associated Trace Elements in Global Geohydrological Systems and ManagementMonday, 26 September 20161:30 PM - 5:30 PMRoom 502
2015
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ISOTOPIC FINGERPRINTING OF NITRATE SOURCES IN GROUNDWATER NEAR HIGHWAY BLASTING SITES
48 Applied Geology in New England: Case Histories of Problems SolvedTuesday, 24 March 20151:30 PM - 5:30 PMGifford Room
2013
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TESTING CONCEPTUAL MODELS FOR PROCESSES CONTROLLING NITRATE REDUCTION COUPLED TO IRON(II) OXIDATION DURING A FIELD-SCALE TRANSPORT EXPERIMENT
T203 Secondary Water Quality Effects of Natural and Enhanced Attenuation of ContaminantsTuesday, 29 October 20138:00 AM - 12:00 PMRoom 303
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IS ANAEROBIC AMMONIUM OXIDATION (“ANAMMOX”) IMPORTANT FOR NITROGEN CYCLING IN GROUNDWATER?
T170 Understanding Contaminant Fate and Transport in Unconsolidated Aquifers—A Session on the Occasion of 30 Years of Long-Term Research at the Cape Cod Toxic Substances Hydrology Field SiteMonday, 28 October 20131:00 PM - 5:00 PMRoom 302
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MOLECULAR QUANTIFICATION OF IN SITU EXPRESSION OF FUNCTIONAL GENES IN ANAMMOX AND DENITRIFYING COMMUNITIES IN THE CAPE COD AQUIFER
T170 Understanding Contaminant Fate and Transport in Unconsolidated Aquifers—A Session on the Occasion of 30 Years of Long-Term Research at the Cape Cod Toxic Substances Hydrology Field SiteMonday, 28 October 20131:00 PM - 5:00 PMRoom 302
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SOIL, PLANT, AND TERRAIN CONTROLS ON NATURAL PERCHLORATE IN A DESERT LANDSCAPE—AMARGOSA DESERT RESEARCH SITE, NEVADA
34 Hydrogeology (Posters)Sunday, 27 October 20139:00 AM - 6:30 PMHall D
2010
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EFFECTS OF GEOLOGICAL HETEROGENEITY on APPARENT REACTION RATES AND ISOTOPE FRACTIONATION
T36 Advances in Understanding Aquifer Heterogeneity and Multi-Scale Flow and Transport in Porous and Fractured Media (Posters)Sunday, 31 October 20108:00 AM - 6:00 PMHall D
2008
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Source and Transport Controls on the Movement of Nitrate to Public Supply Wells in Selected Principal Aquifers of the United States
77 A Celebration of Soil Science, Solute Transport, and National-Scale Water-Quality Research: In Honor of Jacob RubinWednesday, 8 October 20081:30 PM - 5:30 PM
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Perchlorate as An Agricultural Contaminant in Groundwater- Isotopic Signatures of Sources and Biodegradation
64 Subsurface Fate and Transport of Agricultural ContaminantsTuesday, 7 October 20088:00 AM - 12:00 PM
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ISOTOPIC TRACING OF NATURAL AND SYNTHETIC PERCHLORATE IN THE ENVIRONMENT
23 Applications of Isotope Geochemistry in Environmental GeologyFriday, 25 April 20088:20 AM - 12:00 PM
2006
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NATURAL AND ANTHROPOGENIC NITRATE IN GROUND WATER: HIGH PLAINS AQUIFER
T187 Water-Quality Issues in Sole-Source and Principal Aquifers in the U.S.Wednesday, 25 October 20068:00 AM - 12:00 PM
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RECHARGE-DISCHARGE RELATIONSHIPS ON FLOODPLAINS INFLUENCE BIOGEOCHEMICAL PROCESSING OF FLOODWATER NITROGEN AND EXPORT BACK TO RIVERS
T13 Detecting and Characterizing Fluxes of Water and Dissolved Constituents Across the Groundwater Surface-water Interface ISunday, 22 October 20068:00 AM - 12:00 PM
2005
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ASSESSING NITRIFICATION AND ITS EFFECT ON NITROGEN TRANSPORT WITHIN A GROUNDWATER CONTAMINANT PLUME ON CAPE COD USING MULTIPLE ISOTOPIC AND BIOGEOCHEMICAL APPROACHES
T244 Quantifying Controls on Microbial Reaction Rates in Subsurface Environments IIWednesday, 19 October 20051:30 PM - 5:30 PM
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RATES OF REDOX REACTIONS DERIVED FROM DATED GROUNDWATERS WITH APPLICATIONS TO AGRICULTURAL WATERSHEDS
T140 Dissolution, Precipitation, and Redox Reaction Kinetics in AquifersTuesday, 18 October 20058:00 AM - 12:00 PM
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ISOTOPIC IDENTIFICATION OF NATURAL AND ANTHROPOGENIC PERCHLORATE AND NITRATE IN GROUNDWATER
T141 Naturally Occurring Perchlorate (and Other Oxyanions) in the Hydrologic Cycle—Origins, Accumulation, Transformations, and TransportTuesday, 18 October 20058:00 AM - 12:00 PM
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THE EXPANDING SCOPE OF HYPORHEIC-ZONE INVESTIGATIONS IN STREAMS, RIVERS, AND WETLANDS: CONNECTING SMALL-SCALE STORAGE PROCESSES WITH REACH-SCALE CUMULATIVE EFFECTS
T43 Stream-Hyporheic Interactions: Hydrology, Geochemistry, and BiologySunday, 16 October 20051:30 PM - 5:30 PM
2004
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DENITRIFICATION AND PALEORECHARGE CONDITIONS IN A REGIONAL UNCONFINED AQUIFER SYSTEM
T202 Dissolved Gases as Indicators of Geochemical and Hydrogeologic ProcessesWednesday, 10 November 20048:00 AM - 12:00 PM
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SOURCES AND ISOTOPIC CHARACTERISTICS OF VADOSE-ZONE NITRATE IN ARID REGIONS
T137 Vadose Zone Nitrogen: Sources, Fate, and TransportTuesday, 9 November 20048:00 AM - 12:00 PM
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ENVIRONMENTAL ISOTOPE FORENSICS OF PERCHLORATE CONTAMINATION
99 Environmental Geoscience IIMonday, 8 November 20041:30 PM - 5:30 PM
2001
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DETERMINING SOURCES OF NITRATE AND RESIDENCE TIMES OF GROUNDWATER DISCHARGING FROM SPRINGS IN A KARST SYSTEM DURING VARIABLE RECHARGE CONDITIONS
T143 Geochemistry of Karst Waters: A Window on Hydrogeology and BiotaWednesday, 7 November 20011:30 PM - 5:30 PM