Paul Barlow (Former Employee)
Science and Products
Filter Total Items: 46
Optimization techniques using MODFLOW-GWM
An important application of optimization codes such as MODFLOW-GWM is to maximize water supply from unconfined aquifers subject to constraints involving surface-water depletion and drawdown. In optimizing pumping for a fish hatchery in a bedrock aquifer system overlain by glacial deposits in eastern Wisconsin, various features of the GWM-2000 code were used to overcome difficulties associated with
Authors
Anna Grava, Daniel T. Feinstein, Paul M. Barlow, Tullia Bonomi, Fabiola Buarne, Charles Dunning, Randall J. Hunt
Use of multi-node wells in the Groundwater-Management Process of MODFLOW-2005 (GWM-2005)
Many groundwater wells are open to multiple aquifers or to multiple intervals within a single aquifer. These types of wells can be represented in numerical simulations of groundwater flow by use of the Multi-Node Well (MNW) Packages developed for the U.S. Geological Survey’s MODFLOW model. However, previous versions of the Groundwater-Management (GWM) Process for MODFLOW did not allow the use of m
Authors
David P. Ahlfeld, Paul M. Barlow
Understanding and managing the effects of groundwater pumping on streamflow
Groundwater is a critical resource in the United States because it provides drinking water, irrigates crops, supports industry, and is a source of water for rivers, streams, lakes, and springs. Wells that pump water out of aquifers can reduce the amount of groundwater that flows into rivers and streams, which can have detrimental impacts on aquatic ecosystems and the availability of surface water.
Authors
Stanley A. Leake, Paul M. Barlow
Streamflow depletion by wells--Understanding and managing the effects of groundwater pumping on streamflow
Groundwater is an important source of water for many human needs, including public supply, agriculture, and industry. With the development of any natural resource, however, adverse consequences may be associated with its use. One of the primary concerns related to the development of groundwater resources is the effect of groundwater pumping on streamflow. Groundwater and surface-water systems are
Authors
Paul M. Barlow, Stanley A. Leake
WTAQ version 2-A computer program for analysis of aquifer tests in confined and water-table aquifers with alternative representations of drainage from the unsaturated zone
The computer program WTAQ simulates axial-symmetric flow to a well pumping from a confined or unconfined (water-table) aquifer. WTAQ calculates dimensionless or dimensional drawdowns that can be used with measured drawdown data from aquifer tests to estimate aquifer hydraulic properties. Version 2 of the program, which is described in this report, provides an alternative analytical representation
Authors
Paul M. Barlow, Allen F. Moench
Documentation for the State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005)
Many groundwater-management problems are concerned with the control of one or more variables that reflect the state of a groundwater-flow system or a coupled groundwater/surface-water system. These system state variables include the distribution of heads within an aquifer, streamflow rates within a hydraulically connected stream, and flow rates into or out of aquifer storage. This report documents
Authors
David P. Ahlfeld, Paul M. Barlow, Kristine M. Baker
Saltwater intrusion in coastal regions of North America
Saltwater has intruded into many of the coastal aquifers of the United States, Mexico, and Canada, but the extent of saltwater intrusion varies widely among localities and hydrogeologic settings. In many instances, the area contaminated by saltwater is limited to small parts of an aquifer and to specific wells and has had little or no effect on overall groundwater supplies; in other instances, sal
Authors
Paul M. Barlow, Eric G. Reichard
GWM-2005 - A Groundwater-Management Process for MODFLOW-2005 with Local Grid Refinement (LGR) Capability
This report describes the Groundwater-Management (GWM) Process for MODFLOW-2005, the 2005 version of the U.S. Geological Survey modular three-dimensional groundwater model. GWM can solve a broad range of groundwater-management problems by combined use of simulation- and optimization-modeling techniques. These problems include limiting groundwater-level declines or streamflow depletions, managing g
Authors
David P. Ahlfeld, Kristine M. Baker, Paul M. Barlow
GSFLOW - Coupled Ground-Water and Surface-Water Flow Model Based on the Integration of the Precipitation-Runoff Modeling System (PRMS) and the Modular Ground-Water Flow Model (MODFLOW-2005)
The need to assess the effects of variability in climate, biota, geology, and human activities on water availability and flow requires the development of models that couple two or more components of the hydrologic cycle. An integrated hydrologic model called GSFLOW (Ground-water and Surface-water FLOW) was developed to simulate coupled ground-water and surface-water resources. The new model is bas
Authors
Steven L. Markstrom, Richard G. Niswonger, R. Steven Regan, David E. Prudic, Paul M. Barlow
Simulation of Hydrologic-System Responses to Ground-Water Withdrawals in the Hunt-Annaquatucket-Pettaquamscutt Stream-Aquifer System, Rhode Island
A numerical-modeling study was done to better understand hydrologic-system responses to ground-water withdrawals in the Hunt-Annaquatucket-Pettaquamscutt (HAP) stream-aquifer system of Rhode Island. System responses were determined by use of steady-state and transient numerical ground-water-flow models. These models were initially developed in the late 1990s as part of a larger study of the stream
Authors
Paul M. Barlow, Lance J. Ostiguy
Simulation-optimization modeling to assist conjunctive management of stream-aquifer systems of Rhode Island
No abstract available.
Authors
Paul M. Barlow, Gregory E. Granato, David P. Ahlfeld
Groundwater modeling
No abstract available.
Authors
Leonard F. Konikow, Thomas E. Reilly, Paul M. Barlow, Clifford I. Voss
Science and Products
Filter Total Items: 46
Optimization techniques using MODFLOW-GWM
An important application of optimization codes such as MODFLOW-GWM is to maximize water supply from unconfined aquifers subject to constraints involving surface-water depletion and drawdown. In optimizing pumping for a fish hatchery in a bedrock aquifer system overlain by glacial deposits in eastern Wisconsin, various features of the GWM-2000 code were used to overcome difficulties associated with
Authors
Anna Grava, Daniel T. Feinstein, Paul M. Barlow, Tullia Bonomi, Fabiola Buarne, Charles Dunning, Randall J. Hunt
Use of multi-node wells in the Groundwater-Management Process of MODFLOW-2005 (GWM-2005)
Many groundwater wells are open to multiple aquifers or to multiple intervals within a single aquifer. These types of wells can be represented in numerical simulations of groundwater flow by use of the Multi-Node Well (MNW) Packages developed for the U.S. Geological Survey’s MODFLOW model. However, previous versions of the Groundwater-Management (GWM) Process for MODFLOW did not allow the use of m
Authors
David P. Ahlfeld, Paul M. Barlow
Understanding and managing the effects of groundwater pumping on streamflow
Groundwater is a critical resource in the United States because it provides drinking water, irrigates crops, supports industry, and is a source of water for rivers, streams, lakes, and springs. Wells that pump water out of aquifers can reduce the amount of groundwater that flows into rivers and streams, which can have detrimental impacts on aquatic ecosystems and the availability of surface water.
Authors
Stanley A. Leake, Paul M. Barlow
Streamflow depletion by wells--Understanding and managing the effects of groundwater pumping on streamflow
Groundwater is an important source of water for many human needs, including public supply, agriculture, and industry. With the development of any natural resource, however, adverse consequences may be associated with its use. One of the primary concerns related to the development of groundwater resources is the effect of groundwater pumping on streamflow. Groundwater and surface-water systems are
Authors
Paul M. Barlow, Stanley A. Leake
WTAQ version 2-A computer program for analysis of aquifer tests in confined and water-table aquifers with alternative representations of drainage from the unsaturated zone
The computer program WTAQ simulates axial-symmetric flow to a well pumping from a confined or unconfined (water-table) aquifer. WTAQ calculates dimensionless or dimensional drawdowns that can be used with measured drawdown data from aquifer tests to estimate aquifer hydraulic properties. Version 2 of the program, which is described in this report, provides an alternative analytical representation
Authors
Paul M. Barlow, Allen F. Moench
Documentation for the State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005)
Many groundwater-management problems are concerned with the control of one or more variables that reflect the state of a groundwater-flow system or a coupled groundwater/surface-water system. These system state variables include the distribution of heads within an aquifer, streamflow rates within a hydraulically connected stream, and flow rates into or out of aquifer storage. This report documents
Authors
David P. Ahlfeld, Paul M. Barlow, Kristine M. Baker
Saltwater intrusion in coastal regions of North America
Saltwater has intruded into many of the coastal aquifers of the United States, Mexico, and Canada, but the extent of saltwater intrusion varies widely among localities and hydrogeologic settings. In many instances, the area contaminated by saltwater is limited to small parts of an aquifer and to specific wells and has had little or no effect on overall groundwater supplies; in other instances, sal
Authors
Paul M. Barlow, Eric G. Reichard
GWM-2005 - A Groundwater-Management Process for MODFLOW-2005 with Local Grid Refinement (LGR) Capability
This report describes the Groundwater-Management (GWM) Process for MODFLOW-2005, the 2005 version of the U.S. Geological Survey modular three-dimensional groundwater model. GWM can solve a broad range of groundwater-management problems by combined use of simulation- and optimization-modeling techniques. These problems include limiting groundwater-level declines or streamflow depletions, managing g
Authors
David P. Ahlfeld, Kristine M. Baker, Paul M. Barlow
GSFLOW - Coupled Ground-Water and Surface-Water Flow Model Based on the Integration of the Precipitation-Runoff Modeling System (PRMS) and the Modular Ground-Water Flow Model (MODFLOW-2005)
The need to assess the effects of variability in climate, biota, geology, and human activities on water availability and flow requires the development of models that couple two or more components of the hydrologic cycle. An integrated hydrologic model called GSFLOW (Ground-water and Surface-water FLOW) was developed to simulate coupled ground-water and surface-water resources. The new model is bas
Authors
Steven L. Markstrom, Richard G. Niswonger, R. Steven Regan, David E. Prudic, Paul M. Barlow
Simulation of Hydrologic-System Responses to Ground-Water Withdrawals in the Hunt-Annaquatucket-Pettaquamscutt Stream-Aquifer System, Rhode Island
A numerical-modeling study was done to better understand hydrologic-system responses to ground-water withdrawals in the Hunt-Annaquatucket-Pettaquamscutt (HAP) stream-aquifer system of Rhode Island. System responses were determined by use of steady-state and transient numerical ground-water-flow models. These models were initially developed in the late 1990s as part of a larger study of the stream
Authors
Paul M. Barlow, Lance J. Ostiguy
Simulation-optimization modeling to assist conjunctive management of stream-aquifer systems of Rhode Island
No abstract available.
Authors
Paul M. Barlow, Gregory E. Granato, David P. Ahlfeld
Groundwater modeling
No abstract available.
Authors
Leonard F. Konikow, Thomas E. Reilly, Paul M. Barlow, Clifford I. Voss
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government