David Parkhurst (Former Employee)
Science and Products
Filter Total Items: 30
PHREEQCI--A graphical user interface to the geochemical model PHREEQC
No abstract available.
Authors
S.R. Charlton, D.L. Parkhurst
User's guide to PHREEQC (Version 2): A computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations
PHREEQC version 2 is a computer program written in the C programming language that is designed to perform a wide variety of low-temperature aqueous geochemical calculations. PHREEQC is based on an ion-association aqueous model and has capabilities for (1) speciation and saturation-index calculations; (2) batch-reaction and one-dimensional (1D) transport calculations involving reversible reactions,
Authors
David L. Parkhurst, C.A.J. Appelo
PHREEQCI: A graphical user interface for the geochemical computer program PHREEQC
PhreeqcI is a Windows-based graphical user interface for the geochemical computer program PHREEQC. PhreeqcI provides the capability to generate and edit input data files, run simulations, and view text files containing simulation results, all within the framework of a single interface. PHREEQC is a multipurpose geochemical program that can perform speciation, inverse, reaction-path, and 1D advecti
Authors
Scott R. Charlton, Clifford L. Macklin, David L. Parkhurst
Ground-water-quality assessment of the central Oklahoma Aquifer, Oklahoma — Geochemical and geohydrologic investigations
Ground-water samples, core samples, and hydrologic measurements were obtained in the Central Oklahoma Aquifer as part of the pilot National Water-Quality Assessment Program. This report examines ground-water recharge and discharge, the potentiometric surface, the chemical and isotopic composition of ground water, and the abundances and textures of minerals in core materials to determine the rates
Authors
David L. Parkhurst, Scott C. Christenson, George N. Breit
User's guide to PHREEQC, a computer program for speciation, reaction-path, advective-transport, and inverse geochemical calculations
PHREEQC is a computer program written in the C programming language that is designed to perform a wide variety of aqueous geochemical calculations. PHREEQC is based on an ion-association aqueous model and has capabilities for (1) speciation and saturation-index calculations, (2) reaction-path and advective-transport calculations involving specified irreversible reactions, mixing of solutions, mine
Authors
D.L. Parkhurst
An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH, version 2.0
NETPATH is an interactive Fortran 77 computer program used to interpret net geochemical mass-balance reactions between an initial and final water along a hydrologic flow path. Alternatively, NETPATH computes the mixing proportions of two to five initial waters and net geochemical reactions that can account for the observed composition of a final water. The program utilizes previously defined chemi
Authors
Niel Plummer, Eric C. Prestemon, David L. Parkhurst
Ground-water-quality assessment of the Central Oklahoma Aquifer, Oklahoma; analysis of available water-quality data through 1987
No abstract available.
Authors
David L. Parkhurst, Scott C. Christenson, Jamie L. Schlottmann
Ground-water-quality assessment of the Central Oklahoma Aquifer, Oklahoma: Geochemical and geohydrologic investigations
The National Water-Quality Assessment pilot project for the Central Oklahoma aquifer examined the chemical and isotopic composition of ground water, the abundances and textures of minerals in core samples, and water levels and hydraulic properties in the flow system to identify geochemical reactions occurring in the aquifer and rates and directions of ground-water flow. The aquifer underlies 3,000
Authors
David L. Parkhurst, Scott C. Christenson, George N. Breit
An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH
No abstract available.
Authors
Niel Plummer, E.C. Prestemon, D.L. Parkhurst
Geohydrology and water quality of the Roubidoux Aquifer, northeastern Oklahoma
The Roubidoux aquifer is an important source of freshwater for public supplies, commerce, industry, and rural water districts in northeastern Oklahoma. Ground-water withdrawals from the aquifer in 1981 were estimated to be 4.8 million gallons per day, of which about 90 percent was withdrawn in Ottawa County. Wells drilled at the beginning of the 20th century originally flowed at the land surface,
Authors
Scott C. Christenson, David L. Parkhurst, Roy W. Fairchild
Ground-water quality assessment of the central Oklahoma aquifer, Oklahoma - Analysis of available water-quality data through 1987
Beginning in 1986, the Congress annually has appropriated funds for the U.S. Geological Survey to test and refine concepts for a National Water-Quality Assessment (NAWQA) Program. The long-term goals of a full-scale program would be to:Provide a nationally consistent description of current water-quality conditions for a large part of the Nation's surface- and ground-water resources;Define long-ter
Authors
David L. Parkhurst, Scott C. Christenson, Jamie L. Schlottmann
A computer program incorporating Pitzer's equations for calculation of geochemical reactions in brines
The program named PHRQPITZ is a computer code capable of making geochemical calculations in brines and other electrolyte solutions to high concentrations using the Pitzer virial-coefficient approach for activity-coefficient corrections. Reaction-modeling capabilities include calculation of (1) aqueous speciation and mineral-saturation index, (2) mineral solubility, (3) mixing and titration of aque
Authors
Niel Plummer, D.L. Parkhurst, G.W. Fleming, S.A. Dunkle
Science and Products
Filter Total Items: 30
PHREEQCI--A graphical user interface to the geochemical model PHREEQC
No abstract available.
Authors
S.R. Charlton, D.L. Parkhurst
User's guide to PHREEQC (Version 2): A computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations
PHREEQC version 2 is a computer program written in the C programming language that is designed to perform a wide variety of low-temperature aqueous geochemical calculations. PHREEQC is based on an ion-association aqueous model and has capabilities for (1) speciation and saturation-index calculations; (2) batch-reaction and one-dimensional (1D) transport calculations involving reversible reactions,
Authors
David L. Parkhurst, C.A.J. Appelo
PHREEQCI: A graphical user interface for the geochemical computer program PHREEQC
PhreeqcI is a Windows-based graphical user interface for the geochemical computer program PHREEQC. PhreeqcI provides the capability to generate and edit input data files, run simulations, and view text files containing simulation results, all within the framework of a single interface. PHREEQC is a multipurpose geochemical program that can perform speciation, inverse, reaction-path, and 1D advecti
Authors
Scott R. Charlton, Clifford L. Macklin, David L. Parkhurst
Ground-water-quality assessment of the central Oklahoma Aquifer, Oklahoma — Geochemical and geohydrologic investigations
Ground-water samples, core samples, and hydrologic measurements were obtained in the Central Oklahoma Aquifer as part of the pilot National Water-Quality Assessment Program. This report examines ground-water recharge and discharge, the potentiometric surface, the chemical and isotopic composition of ground water, and the abundances and textures of minerals in core materials to determine the rates
Authors
David L. Parkhurst, Scott C. Christenson, George N. Breit
User's guide to PHREEQC, a computer program for speciation, reaction-path, advective-transport, and inverse geochemical calculations
PHREEQC is a computer program written in the C programming language that is designed to perform a wide variety of aqueous geochemical calculations. PHREEQC is based on an ion-association aqueous model and has capabilities for (1) speciation and saturation-index calculations, (2) reaction-path and advective-transport calculations involving specified irreversible reactions, mixing of solutions, mine
Authors
D.L. Parkhurst
An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH, version 2.0
NETPATH is an interactive Fortran 77 computer program used to interpret net geochemical mass-balance reactions between an initial and final water along a hydrologic flow path. Alternatively, NETPATH computes the mixing proportions of two to five initial waters and net geochemical reactions that can account for the observed composition of a final water. The program utilizes previously defined chemi
Authors
Niel Plummer, Eric C. Prestemon, David L. Parkhurst
Ground-water-quality assessment of the Central Oklahoma Aquifer, Oklahoma; analysis of available water-quality data through 1987
No abstract available.
Authors
David L. Parkhurst, Scott C. Christenson, Jamie L. Schlottmann
Ground-water-quality assessment of the Central Oklahoma Aquifer, Oklahoma: Geochemical and geohydrologic investigations
The National Water-Quality Assessment pilot project for the Central Oklahoma aquifer examined the chemical and isotopic composition of ground water, the abundances and textures of minerals in core samples, and water levels and hydraulic properties in the flow system to identify geochemical reactions occurring in the aquifer and rates and directions of ground-water flow. The aquifer underlies 3,000
Authors
David L. Parkhurst, Scott C. Christenson, George N. Breit
An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH
No abstract available.
Authors
Niel Plummer, E.C. Prestemon, D.L. Parkhurst
Geohydrology and water quality of the Roubidoux Aquifer, northeastern Oklahoma
The Roubidoux aquifer is an important source of freshwater for public supplies, commerce, industry, and rural water districts in northeastern Oklahoma. Ground-water withdrawals from the aquifer in 1981 were estimated to be 4.8 million gallons per day, of which about 90 percent was withdrawn in Ottawa County. Wells drilled at the beginning of the 20th century originally flowed at the land surface,
Authors
Scott C. Christenson, David L. Parkhurst, Roy W. Fairchild
Ground-water quality assessment of the central Oklahoma aquifer, Oklahoma - Analysis of available water-quality data through 1987
Beginning in 1986, the Congress annually has appropriated funds for the U.S. Geological Survey to test and refine concepts for a National Water-Quality Assessment (NAWQA) Program. The long-term goals of a full-scale program would be to:Provide a nationally consistent description of current water-quality conditions for a large part of the Nation's surface- and ground-water resources;Define long-ter
Authors
David L. Parkhurst, Scott C. Christenson, Jamie L. Schlottmann
A computer program incorporating Pitzer's equations for calculation of geochemical reactions in brines
The program named PHRQPITZ is a computer code capable of making geochemical calculations in brines and other electrolyte solutions to high concentrations using the Pitzer virial-coefficient approach for activity-coefficient corrections. Reaction-modeling capabilities include calculation of (1) aqueous speciation and mineral-saturation index, (2) mineral solubility, (3) mixing and titration of aque
Authors
Niel Plummer, D.L. Parkhurst, G.W. Fleming, S.A. Dunkle