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Jeff P Raffensperger, Ph.D. (Former Employee)

Science and Products

Filter Total Items: 24

Geology, hydrology, and groundwater contamination in the vicinity of Central Chemical facility, Hagerstown, Maryland

The soil and groundwater at the Central Chemical facility, Hagerstown, Maryland, are contaminated due to the blending and production of pesticides and fertilizers during much of the 20th century. Remedial investigations focus on two operable units (OU) consisting of the surface soils and waste disposal lagoon (OU-1) and the groundwater (OU-2). The contaminants of concern (COC) for...
Authors
Trevor P. Needham, Alex R. Fiore, Scott W. Ator, Jeff P. Raffensperger, Madison B. Smith, Nicole M. Bellmyer, Caitlyn M. Dugan, Carol J. Morel

Hydrogeologic characterization of Area B, Fort Detrick, Maryland

Groundwater in the karst groundwater system at Area B of Fort Detrick in Frederick County, Maryland, is contaminated with chlorinated solvents from the past disposal of laboratory wastes. In cooperation with U.S. Army Environmental Command and U.S. Army Garrison Fort Detrick, the U.S. Geological Survey performed a 3-year study to refine the conceptual model of groundwater flow in and...
Authors
Phillip J. Goodling, Brandon Fleming, John Solder, Alexander M. Soroka, Jeff P. Raffensperger
By
Maryland-Delaware-D.C. Water Science Center

Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050

ForewordSustaining the quality of the Nation’s water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken together, these actions lead to immediate and...
Authors
John W. Clune, Paul D. Capel, Matthew P. Miller, Douglas A. Burns, Andrew J. Sekellick, Peter R. Claggett, Richard H. Coupe, Rosemary M. Fanelli, Ana Maria Garcia, Jeff P. Raffensperger, Silvia Terziotti, Gopal Bhatt, Joel D. Blomquist, Kristina G. Hopkins, Jennifer L. Keisman, Lewis C. Linker, Gary W. Shenk, Richard A. Smith, Alexander M. Soroka, James S. Webber, David M. Wolock, Qian Zhang
By
Water Resources Mission Area, Chesapeake Bay Activities, Maryland-Delaware-D.C. Water Science Center, New York Water Science Center, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC), Utah Water Science Center, Virginia and West Virginia Water Science Center

Simulated effects of sea-level rise on the shallow, fresh groundwater system of Assateague Island, Maryland and Virginia

The U.S. Geological Survey, in cooperation with the National Park Service, developed a three-dimensional groundwater-flow model for Assateague Island in eastern Maryland and Virginia to assess the effects of sea-level rise on the groundwater system. Sea-level rise is expected to increase the altitude of the water table in barrier island aquifer systems, possibly leading to adverse...
Authors
Brandon Fleming, Jeff P. Raffensperger, Phillip J. Goodling, John P. Masterson
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Virginia and West Virginia Water Science Center

Simulation of groundwater flow in the aquifer system of the Anacostia River and surrounding watersheds, Washington, D.C., Maryland, and Virginia

The U.S. Geological Survey, in cooperation with the District Department of Energy & Environment, Water Quality Division, is investigating the hydrogeology of the tidal Anacostia River watershed within Washington, D.C., with the goal of improving understanding of the groundwater-flow system and the interaction of groundwater and surface water in the watershed. To help meet this goal, a...
Authors
Jeff P. Raffensperger, Lois M. Voronin, Cheryl A. Dieter
By
Water Resources Mission Area, New Jersey Water Science Center

Estimation of base flow by optimal hydrograph separation for the conterminous United States and implications for national-extent hydrologic models

Optimal hydrograph separation (OHS) uses a two-parameter recursive digital filter that applies specific conductance mass-balance constraints to estimate the base flow contribution to total streamflow at stream gages where discharge and specific conductance are measured. OHS was applied to U.S. Geological Survey (USGS) stream gages across the conterminous United States to examine the...
Authors
Sydney Foks, Jeff P. Raffensperger, Colin A. Penn, Jessica M. Driscoll
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Colorado Water Science Center

Optimal hydrograph separation using a recursive digital filter constrained by chemical mass balance, with application to selected Chesapeake Bay watersheds

Quantitative estimates of base flow are necessary to address questions concerning the vulnerability and response of the Nation’s water supply to natural and human-induced change in environmental conditions. An objective of the U.S. Geological Survey National Water-Quality Assessment Project is to determine how hydrologic systems are affected by watershed characteristics, including land...
Authors
Jeff P. Raffensperger, Anna C. Baker, Joel D. Blomquist, Jessica A. Hopple
By
Water Resources Mission Area, Chesapeake Bay Activities, Maryland-Delaware-D.C. Water Science Center, Pennsylvania Water Science Center

Hydrogeologic framework, hydrology, and refined conceptual model of groundwater flow for Coastal Plain aquifers at the Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2005-12

From 1966 to 2002, activities at the Standard Chlorine of Delaware chemical facility in New Castle County, Delaware resulted in the contamination of groundwater, soils, and wetland sediment. In 2005, the U.S. Geological Survey (USGS), in partnership with the U.S. Environmental Protection Agency, Region 3, and the Delaware Department of Natural Resources and Environmental Control began a...
Authors
Michael J. Brayton, Roberto M. Cruz, Luke Myers, James R. Degnan, Jeff P. Raffensperger
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center

Hydrogeologic characterization and assessment of bioremediation of chlorinated benzenes and benzene in wetland areas, Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2009-12

Wetlands at the Standard Chlorine of Delaware, Inc. Superfund Site (SCD) in New Castle County, Delaware, are affected by contamination with chlorobenzenes and benzene from past waste storage and disposal, spills, leaks, and contaminated groundwater discharge. In cooperation with the U.S. Environmental Protection Agency, the U.S. Geological Survey began an investigation in June 2009 to...
Authors
Michelle M. Lorah, Charles W. Walker, Anna C. Baker, Jessica A. Teunis, Emily Majcher, Michael J. Brayton, Jeff P. Raffensperger, Isabelle M. Cozzarelli
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Reston Biogeochemical Processes in Groundwater Laboratory

Old groundwater in parts of the upper Patapsco aquifer, Atlantic Coastal Plain, Maryland, USA: Evidence from radiocarbon, chlorine-36 and helium-4

Apparent groundwater ages along two flow paths in the upper Patapsco aquifer of the Maryland Atlantic Coastal Plain, USA, were estimated using 14C, 36Cl and 4He data. Most of the ages range from modern to about 500 ka, with one sample at 117 km downgradient from the recharge area dated by radiogenic 4He accumulation at more than one Ma. Last glacial maximum (LGM) water was located about...
Authors
Niel Plummer, John R. Eggleston, Jeff P. Raffensperger, Andrew G. Hunt, Gerolamo C. Casile, D. C. Andreasen
By
Water Resources Mission Area

Simulation of groundwater flow to assess future withdrawals associated with Base Realignment and Closure (BRAC) at Fort George G. Meade, Maryland

Increased groundwater withdrawals from confined aquifers in the Maryland Coastal Plain to supply anticipated growth at Fort George G. Meade (Fort Meade) and surrounding areas resulting from the Department of Defense Base Realignment and Closure Program may have adverse effects in the outcrop or near-outcrop areas. Specifically, increased pumping from the Potomac Group aquifers...
Authors
Jeff P. Raffensperger, Brandon Fleming, William S.L. Banks, Marilee A. Horn, Mark R. Nardi, David C. Andreasen
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center

Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management

The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including...
Authors
Scott W. Ator, Vicki S. Blazer, John W. Brakebill, Donald R. Cahoon, Peter R. Claggett, Thomas M. Cronin, Judith M. Denver, Christine L. Densmore, Allen C. Gellis, Cliff R. Hupp, Jurate M. Landwehr, Michael J. Langland, Christopher A. Ottinger, Milan J. Pavich, Matthew C. Perry, Scott W. Phillips, Stephen D. Preston, Jeff P. Raffensperger, Barnett A. Rattner, Nancy B. Rybicki, Debra A. Willard
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Chesapeake Bay Activities

Non-USGS Publications**

Raffensperger, J.P., 1997, Evidence and modeling of large-scale groundwater convection in Precambrian sedimentary basins, in Montañez, I.P., Gregg, J.M., and Shelton, K.L., eds., Basin-wide Diagenetic Patterns: Integrated Petrologic, Geochemical, and Hydrologic Considerations: Tulsa, OK, SEPM, No. 57, p. 15-26, http://archives.datapages.com/data/sepm_sp/SP57/Evidence_and_Modeling_of_Large-Scale.htm.
Garven, G., and Raffensperger, J.P., 1997, Hydrogeology and geochemistry of ore genesis in sedimentary basins, in Barnes, H.L., ed., Geochemistry of Hydrothermal Ore Deposits (3rd ed.): New York, John Wiley & Sons, Inc., p. 125-189.
Person, M., Raffensperger, J.P., Ge, S., and Garven, G., 1996, Basin-scale hydrogeologic modeling: Reviews of Geophysics, v. 34, no. 1, p. 61-87, https://dx.doi.org/10.1029/95RG03286.
Raffensperger, J.P., 1996, Numerical simulation of sedimentary basin-scale hydrochemical processes, in Corapcioglu, M.Y., ed., Advances in Porous Media: Amsterdam, Elsevier, Volume 3, p. 185-305.
Raffensperger, J.P., 1996, Earth's hydrosphere, in Dasch, E.J., ed., Encyclopedia of Earth Sciences: New York, Simon & Schuster Macmillan, Volume 1, p. 243-246.
Garven, G., and Raffensperger, J.P., 1996, Two-dimensional reactive-flow modeling of uranium transport in Proterozoic sedimentary basins, in Joint U.S. Geological Survey, U.S. Nuclear Regulatory Commission Workshop on Research Related to Low-level Radioactive Waste Disposal: National Center, Reston, Virginia, May 4-6, 1993: U. S. Geological Survey Water-Resources Investigations Report 95-4015, p. 196-200, https://pubs.er.usgs.gov/publication/wri954015.
Raffensperger, J.P., and Garven, G., 1995, The formation of unconformity-type uranium ore deposits 1. Coupled groundwater flow and heat transport modeling: American Journal of Science, v. 295, no. 5, p. 581-636, http://www.ajsonline.org/content/295/5/581.full.pdf+html.
Raffensperger, J.P., and Garven, G., 1995, The formation of unconformity-type uranium ore deposits 2. Coupled hydrochemical modeling: American Journal of Science, v. 295, no. 6, p. 639-696, http://www.ajsonline.org/content/295/6/639.full.pdf+html.
Evans, D.G., and Raffensperger, J.P., 1992, On the stream function for variable-density groundwater flow: Water Resources Research, v. 28, no. 8, p. 2141-2145, https://dx.doi.org/10.1029/92WR01060.
Raffensperger, J.P., and Ferrell, R.E., 1991, An empirical model of intrinsic permeability in reactive clay-bearing sands: Water Resources Research, v. 27, no. 11, p. 2835-2844, https://dx.doi.org/10.1029/91WR01570.
Raffensperger, J.P., and Ferrell, R.E., Jr., 1990, Permeant-induced changes in the permeability, microtexture, and pore structure of unconsolidated water-sensitive sediments. Proceedings of the 9th International Clay Conference, Strasbourg, 1989: Sciences Géologiques, Mémoires, v. 87, p. 75-83.

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

link
Example layer-bottom altitudes from MODFLOW-NWT.

Modeling Capabilities @ MD-DE-DC

USGS models are widely used to predict responses of hydrologic systems to changing stresses, such as increases in precipitation or ground-water pumping rates, as well as to predict the fate and movement of solutes and contaminants in water. The USGS is at the forefront of devising new techniques and computer software to solve practical problems in the study of water resources. Predictive models...
By
Maryland-Delaware-D.C. Water Science Center
link

Modeling Capabilities @ MD-DE-DC

USGS models are widely used to predict responses of hydrologic systems to changing stresses, such as increases in precipitation or ground-water pumping rates, as well as to predict the fate and movement of solutes and contaminants in water. The USGS is at the forefront of devising new techniques and computer software to solve practical problems in the study of water resources. Predictive models...
Learn More
link
Daily depths by year (dots) and sparrow hydrologic preferences (rectangles) for subpopulation F

Coding and Statistical Data Capabilities @ MD-DE-DC

This site is dedicated to Coding and Statistical Data that is produced and analyzed by scientists at the MD-DE-DC WSC. We use many tools at the USGS including software exclusively developed for, sometimes written by the USGS.
By
Maryland-Delaware-D.C. Water Science Center
link

Coding and Statistical Data Capabilities @ MD-DE-DC

This site is dedicated to Coding and Statistical Data that is produced and analyzed by scientists at the MD-DE-DC WSC. We use many tools at the USGS including software exclusively developed for, sometimes written by the USGS.
Learn More
link
MD-DE-DC Water Science Center

Groundwater Capabilities @ MD-DE-DC

Our region's water supply comes from streams and rivers, groundwater, and reservoirs. Areas not served by public-water supply rely on groundwater withdrawn from fractured rock aquifers in western Maryland, or surficial (water table) and confined aquifers in southern Maryland, Delaware, Washington, D.C., and the Eastern Shore. Groundwater research works to improve our understanding of groundwater...
By
Maryland-Delaware-D.C. Water Science Center
link

Groundwater Capabilities @ MD-DE-DC

Our region's water supply comes from streams and rivers, groundwater, and reservoirs. Areas not served by public-water supply rely on groundwater withdrawn from fractured rock aquifers in western Maryland, or surficial (water table) and confined aquifers in southern Maryland, Delaware, Washington, D.C., and the Eastern Shore. Groundwater research works to improve our understanding of groundwater...
Learn More
link
USGS-Chesapeake Bay Program Watershed Model Image 1

USGS-Chesapeake Bay Program Watershed Model

The USGS is collaborating with the Chesapeake Bay Program (CBP) to incorporate the USGS Potomac Watershed and Chesapeake Bay Virginia Watershed models into Phase 5 of the Chesapeake Bay Watershed Model (CBWM).
By
Virginia and West Virginia Water Science Center
link

USGS-Chesapeake Bay Program Watershed Model

The USGS is collaborating with the Chesapeake Bay Program (CBP) to incorporate the USGS Potomac Watershed and Chesapeake Bay Virginia Watershed models into Phase 5 of the Chesapeake Bay Watershed Model (CBWM).
Learn More

MODFLOW-NWT model with SWI2 used to evaluate the water-table response of sea-level rise and change in recharge, Assateague Island, Maryland and Virginia:

A three-dimensional groundwater flow model, MODFLOW-NWT with the SWI2 module, was developed to provide a better understanding of the fresh groundwater system of Assateague Island, Maryland and Virginia. Groundwater flow on Assateague Island was simulated to evaluate the effects of sea-level rise and changes in recharge on the depth to freshwater below the land surface, changes in...
By
Maryland-Delaware-D.C. Water Science Center

Base flow estimation via optimal hydrograph separation at CONUS watersheds and comparison to the National Hydrologic Model - Precipitation-Runoff Modeling System by HRU calibrated version

Optimal hydrograph separation (OHS) is a two-component, hydrograph separation method that uses a two-parameter, recursive digital filter (RDF) constrained via chemical mass balance to estimate the base flow contribution to a stream or river (Rimmer and Hartman, 2014; Raffensperger et al., 2017). A recursive digital filter distinguishes between high-frequency and low-frequency discharge...
By
Water Resources Mission Area

Hydrograph-separation results for 225 streams in the Chesapeake Bay watershed derived by using PART, HYSEP (Fixed, Local minimum, Slide), BFI, and a Recursive Digital Filter with streamflow data ranging from 1913 through 2016

This U.S. Geological Survey (USGS) data release contains daily-mean streamflow and estimated-daily base flow for 225 stream gages in the Chesapeake Bay watershed ranging from 1913 to 2016 (beginning and end dates may vary). There is a table containing hydrograph-separation results by six methods for 225 sites (Hydrograph_separation_results_for_225_streams_in_the_Chesapeake_Bay_watershed)...
By
Chesapeake Bay Activities, New Jersey Water Science Center
MD-DE-DC WSC Capabilities Sites

MD-DE-DC WSC Capabilities Sites

We’ve created a series of websites, thematically named to characterize our work as our “Capabilities”, working interdependently with a diverse array...

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Science and Products

Filter Total Items: 24

Geology, hydrology, and groundwater contamination in the vicinity of Central Chemical facility, Hagerstown, Maryland

The soil and groundwater at the Central Chemical facility, Hagerstown, Maryland, are contaminated due to the blending and production of pesticides and fertilizers during much of the 20th century. Remedial investigations focus on two operable units (OU) consisting of the surface soils and waste disposal lagoon (OU-1) and the groundwater (OU-2). The contaminants of concern (COC) for...
Authors
Trevor P. Needham, Alex R. Fiore, Scott W. Ator, Jeff P. Raffensperger, Madison B. Smith, Nicole M. Bellmyer, Caitlyn M. Dugan, Carol J. Morel

Hydrogeologic characterization of Area B, Fort Detrick, Maryland

Groundwater in the karst groundwater system at Area B of Fort Detrick in Frederick County, Maryland, is contaminated with chlorinated solvents from the past disposal of laboratory wastes. In cooperation with U.S. Army Environmental Command and U.S. Army Garrison Fort Detrick, the U.S. Geological Survey performed a 3-year study to refine the conceptual model of groundwater flow in and...
Authors
Phillip J. Goodling, Brandon Fleming, John Solder, Alexander M. Soroka, Jeff P. Raffensperger
By
Maryland-Delaware-D.C. Water Science Center

Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050

ForewordSustaining the quality of the Nation’s water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken together, these actions lead to immediate and...
Authors
John W. Clune, Paul D. Capel, Matthew P. Miller, Douglas A. Burns, Andrew J. Sekellick, Peter R. Claggett, Richard H. Coupe, Rosemary M. Fanelli, Ana Maria Garcia, Jeff P. Raffensperger, Silvia Terziotti, Gopal Bhatt, Joel D. Blomquist, Kristina G. Hopkins, Jennifer L. Keisman, Lewis C. Linker, Gary W. Shenk, Richard A. Smith, Alexander M. Soroka, James S. Webber, David M. Wolock, Qian Zhang
By
Water Resources Mission Area, Chesapeake Bay Activities, Maryland-Delaware-D.C. Water Science Center, New York Water Science Center, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC), Utah Water Science Center, Virginia and West Virginia Water Science Center

Simulated effects of sea-level rise on the shallow, fresh groundwater system of Assateague Island, Maryland and Virginia

The U.S. Geological Survey, in cooperation with the National Park Service, developed a three-dimensional groundwater-flow model for Assateague Island in eastern Maryland and Virginia to assess the effects of sea-level rise on the groundwater system. Sea-level rise is expected to increase the altitude of the water table in barrier island aquifer systems, possibly leading to adverse...
Authors
Brandon Fleming, Jeff P. Raffensperger, Phillip J. Goodling, John P. Masterson
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Virginia and West Virginia Water Science Center

Simulation of groundwater flow in the aquifer system of the Anacostia River and surrounding watersheds, Washington, D.C., Maryland, and Virginia

The U.S. Geological Survey, in cooperation with the District Department of Energy & Environment, Water Quality Division, is investigating the hydrogeology of the tidal Anacostia River watershed within Washington, D.C., with the goal of improving understanding of the groundwater-flow system and the interaction of groundwater and surface water in the watershed. To help meet this goal, a...
Authors
Jeff P. Raffensperger, Lois M. Voronin, Cheryl A. Dieter
By
Water Resources Mission Area, New Jersey Water Science Center

Estimation of base flow by optimal hydrograph separation for the conterminous United States and implications for national-extent hydrologic models

Optimal hydrograph separation (OHS) uses a two-parameter recursive digital filter that applies specific conductance mass-balance constraints to estimate the base flow contribution to total streamflow at stream gages where discharge and specific conductance are measured. OHS was applied to U.S. Geological Survey (USGS) stream gages across the conterminous United States to examine the...
Authors
Sydney Foks, Jeff P. Raffensperger, Colin A. Penn, Jessica M. Driscoll
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Colorado Water Science Center

Optimal hydrograph separation using a recursive digital filter constrained by chemical mass balance, with application to selected Chesapeake Bay watersheds

Quantitative estimates of base flow are necessary to address questions concerning the vulnerability and response of the Nation’s water supply to natural and human-induced change in environmental conditions. An objective of the U.S. Geological Survey National Water-Quality Assessment Project is to determine how hydrologic systems are affected by watershed characteristics, including land...
Authors
Jeff P. Raffensperger, Anna C. Baker, Joel D. Blomquist, Jessica A. Hopple
By
Water Resources Mission Area, Chesapeake Bay Activities, Maryland-Delaware-D.C. Water Science Center, Pennsylvania Water Science Center

Hydrogeologic framework, hydrology, and refined conceptual model of groundwater flow for Coastal Plain aquifers at the Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2005-12

From 1966 to 2002, activities at the Standard Chlorine of Delaware chemical facility in New Castle County, Delaware resulted in the contamination of groundwater, soils, and wetland sediment. In 2005, the U.S. Geological Survey (USGS), in partnership with the U.S. Environmental Protection Agency, Region 3, and the Delaware Department of Natural Resources and Environmental Control began a...
Authors
Michael J. Brayton, Roberto M. Cruz, Luke Myers, James R. Degnan, Jeff P. Raffensperger
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center

Hydrogeologic characterization and assessment of bioremediation of chlorinated benzenes and benzene in wetland areas, Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2009-12

Wetlands at the Standard Chlorine of Delaware, Inc. Superfund Site (SCD) in New Castle County, Delaware, are affected by contamination with chlorobenzenes and benzene from past waste storage and disposal, spills, leaks, and contaminated groundwater discharge. In cooperation with the U.S. Environmental Protection Agency, the U.S. Geological Survey began an investigation in June 2009 to...
Authors
Michelle M. Lorah, Charles W. Walker, Anna C. Baker, Jessica A. Teunis, Emily Majcher, Michael J. Brayton, Jeff P. Raffensperger, Isabelle M. Cozzarelli
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Reston Biogeochemical Processes in Groundwater Laboratory

Old groundwater in parts of the upper Patapsco aquifer, Atlantic Coastal Plain, Maryland, USA: Evidence from radiocarbon, chlorine-36 and helium-4

Apparent groundwater ages along two flow paths in the upper Patapsco aquifer of the Maryland Atlantic Coastal Plain, USA, were estimated using 14C, 36Cl and 4He data. Most of the ages range from modern to about 500 ka, with one sample at 117 km downgradient from the recharge area dated by radiogenic 4He accumulation at more than one Ma. Last glacial maximum (LGM) water was located about...
Authors
Niel Plummer, John R. Eggleston, Jeff P. Raffensperger, Andrew G. Hunt, Gerolamo C. Casile, D. C. Andreasen
By
Water Resources Mission Area

Simulation of groundwater flow to assess future withdrawals associated with Base Realignment and Closure (BRAC) at Fort George G. Meade, Maryland

Increased groundwater withdrawals from confined aquifers in the Maryland Coastal Plain to supply anticipated growth at Fort George G. Meade (Fort Meade) and surrounding areas resulting from the Department of Defense Base Realignment and Closure Program may have adverse effects in the outcrop or near-outcrop areas. Specifically, increased pumping from the Potomac Group aquifers...
Authors
Jeff P. Raffensperger, Brandon Fleming, William S.L. Banks, Marilee A. Horn, Mark R. Nardi, David C. Andreasen
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center

Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management

The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including...
Authors
Scott W. Ator, Vicki S. Blazer, John W. Brakebill, Donald R. Cahoon, Peter R. Claggett, Thomas M. Cronin, Judith M. Denver, Christine L. Densmore, Allen C. Gellis, Cliff R. Hupp, Jurate M. Landwehr, Michael J. Langland, Christopher A. Ottinger, Milan J. Pavich, Matthew C. Perry, Scott W. Phillips, Stephen D. Preston, Jeff P. Raffensperger, Barnett A. Rattner, Nancy B. Rybicki, Debra A. Willard
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Chesapeake Bay Activities

Non-USGS Publications**

Raffensperger, J.P., 1997, Evidence and modeling of large-scale groundwater convection in Precambrian sedimentary basins, in Montañez, I.P., Gregg, J.M., and Shelton, K.L., eds., Basin-wide Diagenetic Patterns: Integrated Petrologic, Geochemical, and Hydrologic Considerations: Tulsa, OK, SEPM, No. 57, p. 15-26, http://archives.datapages.com/data/sepm_sp/SP57/Evidence_and_Modeling_of_Large-Scale.htm.
Garven, G., and Raffensperger, J.P., 1997, Hydrogeology and geochemistry of ore genesis in sedimentary basins, in Barnes, H.L., ed., Geochemistry of Hydrothermal Ore Deposits (3rd ed.): New York, John Wiley & Sons, Inc., p. 125-189.
Person, M., Raffensperger, J.P., Ge, S., and Garven, G., 1996, Basin-scale hydrogeologic modeling: Reviews of Geophysics, v. 34, no. 1, p. 61-87, https://dx.doi.org/10.1029/95RG03286.
Raffensperger, J.P., 1996, Numerical simulation of sedimentary basin-scale hydrochemical processes, in Corapcioglu, M.Y., ed., Advances in Porous Media: Amsterdam, Elsevier, Volume 3, p. 185-305.
Raffensperger, J.P., 1996, Earth's hydrosphere, in Dasch, E.J., ed., Encyclopedia of Earth Sciences: New York, Simon & Schuster Macmillan, Volume 1, p. 243-246.
Garven, G., and Raffensperger, J.P., 1996, Two-dimensional reactive-flow modeling of uranium transport in Proterozoic sedimentary basins, in Joint U.S. Geological Survey, U.S. Nuclear Regulatory Commission Workshop on Research Related to Low-level Radioactive Waste Disposal: National Center, Reston, Virginia, May 4-6, 1993: U. S. Geological Survey Water-Resources Investigations Report 95-4015, p. 196-200, https://pubs.er.usgs.gov/publication/wri954015.
Raffensperger, J.P., and Garven, G., 1995, The formation of unconformity-type uranium ore deposits 1. Coupled groundwater flow and heat transport modeling: American Journal of Science, v. 295, no. 5, p. 581-636, http://www.ajsonline.org/content/295/5/581.full.pdf+html.
Raffensperger, J.P., and Garven, G., 1995, The formation of unconformity-type uranium ore deposits 2. Coupled hydrochemical modeling: American Journal of Science, v. 295, no. 6, p. 639-696, http://www.ajsonline.org/content/295/6/639.full.pdf+html.
Evans, D.G., and Raffensperger, J.P., 1992, On the stream function for variable-density groundwater flow: Water Resources Research, v. 28, no. 8, p. 2141-2145, https://dx.doi.org/10.1029/92WR01060.
Raffensperger, J.P., and Ferrell, R.E., 1991, An empirical model of intrinsic permeability in reactive clay-bearing sands: Water Resources Research, v. 27, no. 11, p. 2835-2844, https://dx.doi.org/10.1029/91WR01570.
Raffensperger, J.P., and Ferrell, R.E., Jr., 1990, Permeant-induced changes in the permeability, microtexture, and pore structure of unconsolidated water-sensitive sediments. Proceedings of the 9th International Clay Conference, Strasbourg, 1989: Sciences Géologiques, Mémoires, v. 87, p. 75-83.

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

link
Example layer-bottom altitudes from MODFLOW-NWT.

Modeling Capabilities @ MD-DE-DC

USGS models are widely used to predict responses of hydrologic systems to changing stresses, such as increases in precipitation or ground-water pumping rates, as well as to predict the fate and movement of solutes and contaminants in water. The USGS is at the forefront of devising new techniques and computer software to solve practical problems in the study of water resources. Predictive models...
By
Maryland-Delaware-D.C. Water Science Center
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Modeling Capabilities @ MD-DE-DC

USGS models are widely used to predict responses of hydrologic systems to changing stresses, such as increases in precipitation or ground-water pumping rates, as well as to predict the fate and movement of solutes and contaminants in water. The USGS is at the forefront of devising new techniques and computer software to solve practical problems in the study of water resources. Predictive models...
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Daily depths by year (dots) and sparrow hydrologic preferences (rectangles) for subpopulation F

Coding and Statistical Data Capabilities @ MD-DE-DC

This site is dedicated to Coding and Statistical Data that is produced and analyzed by scientists at the MD-DE-DC WSC. We use many tools at the USGS including software exclusively developed for, sometimes written by the USGS.
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Maryland-Delaware-D.C. Water Science Center
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Coding and Statistical Data Capabilities @ MD-DE-DC

This site is dedicated to Coding and Statistical Data that is produced and analyzed by scientists at the MD-DE-DC WSC. We use many tools at the USGS including software exclusively developed for, sometimes written by the USGS.
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MD-DE-DC Water Science Center

Groundwater Capabilities @ MD-DE-DC

Our region's water supply comes from streams and rivers, groundwater, and reservoirs. Areas not served by public-water supply rely on groundwater withdrawn from fractured rock aquifers in western Maryland, or surficial (water table) and confined aquifers in southern Maryland, Delaware, Washington, D.C., and the Eastern Shore. Groundwater research works to improve our understanding of groundwater...
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Maryland-Delaware-D.C. Water Science Center
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Groundwater Capabilities @ MD-DE-DC

Our region's water supply comes from streams and rivers, groundwater, and reservoirs. Areas not served by public-water supply rely on groundwater withdrawn from fractured rock aquifers in western Maryland, or surficial (water table) and confined aquifers in southern Maryland, Delaware, Washington, D.C., and the Eastern Shore. Groundwater research works to improve our understanding of groundwater...
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USGS-Chesapeake Bay Program Watershed Model Image 1

USGS-Chesapeake Bay Program Watershed Model

The USGS is collaborating with the Chesapeake Bay Program (CBP) to incorporate the USGS Potomac Watershed and Chesapeake Bay Virginia Watershed models into Phase 5 of the Chesapeake Bay Watershed Model (CBWM).
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Virginia and West Virginia Water Science Center
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USGS-Chesapeake Bay Program Watershed Model

The USGS is collaborating with the Chesapeake Bay Program (CBP) to incorporate the USGS Potomac Watershed and Chesapeake Bay Virginia Watershed models into Phase 5 of the Chesapeake Bay Watershed Model (CBWM).
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MODFLOW-NWT model with SWI2 used to evaluate the water-table response of sea-level rise and change in recharge, Assateague Island, Maryland and Virginia:

A three-dimensional groundwater flow model, MODFLOW-NWT with the SWI2 module, was developed to provide a better understanding of the fresh groundwater system of Assateague Island, Maryland and Virginia. Groundwater flow on Assateague Island was simulated to evaluate the effects of sea-level rise and changes in recharge on the depth to freshwater below the land surface, changes in...
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Maryland-Delaware-D.C. Water Science Center

Base flow estimation via optimal hydrograph separation at CONUS watersheds and comparison to the National Hydrologic Model - Precipitation-Runoff Modeling System by HRU calibrated version

Optimal hydrograph separation (OHS) is a two-component, hydrograph separation method that uses a two-parameter, recursive digital filter (RDF) constrained via chemical mass balance to estimate the base flow contribution to a stream or river (Rimmer and Hartman, 2014; Raffensperger et al., 2017). A recursive digital filter distinguishes between high-frequency and low-frequency discharge...
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Water Resources Mission Area

Hydrograph-separation results for 225 streams in the Chesapeake Bay watershed derived by using PART, HYSEP (Fixed, Local minimum, Slide), BFI, and a Recursive Digital Filter with streamflow data ranging from 1913 through 2016

This U.S. Geological Survey (USGS) data release contains daily-mean streamflow and estimated-daily base flow for 225 stream gages in the Chesapeake Bay watershed ranging from 1913 to 2016 (beginning and end dates may vary). There is a table containing hydrograph-separation results by six methods for 225 sites (Hydrograph_separation_results_for_225_streams_in_the_Chesapeake_Bay_watershed)...
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Chesapeake Bay Activities, New Jersey Water Science Center
MD-DE-DC WSC Capabilities Sites

MD-DE-DC WSC Capabilities Sites

We’ve created a series of websites, thematically named to characterize our work as our “Capabilities”, working interdependently with a diverse array...

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