Claire R Tiedeman
Claire Tiedeman is an Emeritus Research Hydrologist in the USGS Water Resources Mission Area, Earth System Processes Division, Water Cycle Branch.
Claire Tiedeman is an Emeritus Research Hydrologist in the USGS Water Resources Mission Area, Earth System Processes Division, Water Cycle Branch. She has used field methods and modeling tools to conduct research on groundwater flow and solute transport in a wide range of complex geologic settings, including basin-scale flow systems and site-scale fractured-rock aquifers. Her research also involves development and application of methods for assessing model uncertainty.
Science and Products
Filter Total Items: 40
Effect of correlated observation error on parameters, predictions, and uncertainty
Correlations among observation errors are typically omitted when calculating observation weights for model calibration by inverse methods. We explore the effects of omitting these correlations on estimates of parameters, predictions, and uncertainties. First, we develop a new analytical expression for the difference in parameter variance estimated with and without error correlations for a simple o
Authors
Claire R. Tiedeman, Christopher T. Green
Knowledge, transparency, and refutability in groundwater models, an example from the Death Valley regional groundwater flow system
This work demonstrates how available knowledge can be used to build more transparent and refutable computer models of groundwater systems. The Death Valley regional groundwater flow system, which surrounds a proposed site for a high level nuclear waste repository of the United States of America, and the Nevada National Security Site (NNSS), where nuclear weapons were tested, is used to explore mod
Authors
Mary C. Hill, Claudia C. Faunt, Wayne Belcher, Donald S. Sweetkind, Claire R. Tiedeman, Dmitri Kavetski
Groundwater flow and water budget in the surficial and Floridan aquifer systems in east-central Florida
A numerical transient model of the surficial and Floridan aquifer systems in east-central Florida was developed to (1) increase the understanding of water exchanges between the surficial and the Floridan aquifer systems, (2) assess the recharge rates to the surficial aquifer system from infiltration through the unsaturated zone and (3) obtain a simulation tool that could be used by water-resource
Authors
Nicasio Sepúlveda, Claire R. Tiedeman, Andrew M. O'Reilly, Jeffrey B. Davis, Patrick Burger
Groundwater flow and water budget in the surficial and Floridan aquifer systems in east-central Florida
A numerical transient model of the surficial and Floridan aquifer systems in east-central Florida was developed to (1) increase the understanding of water exchanges between the surficial and the Floridan aquifer systems, (2) assess the recharge rates to the surficial aquifer system from infiltration through the unsaturated zone and (3) obtain a simulation tool that could be used by water-resource
Authors
Nicasio Sepúlveda, Claire R. Tiedeman, Andrew M. O'Reilly, Jeffery B. Davis, Patrick Burger
Enhanced dichloroethene biodegradation in fractured rock under biostimulated and bioaugmented conditions
Significant microbial reductive dechlorination of [1,2 14C] cis-dichloroethene (DCE) was observed in anoxic microcosms prepared with unamended, fractured rock aquifer materials, which were colonized in situ at multiple depths in two boreholes at the Naval Air Warfare Center (NAWC) in West Trenton, New Jersey. The lack of significant reductive dechlorination in corresponding water-only treatments i
Authors
Paul M. Bradley, Celeste A. Journey, Julie D. Kirshtein, Mary A. Voytek, Pierre J. Lacombe, Thomas E. Imbrigiotta, Francis H. Chapelle, Claire R. Tiedeman, Daniel J. Goode
Advancing electrical geophysical characterization of DNAPL-contaminated fractured rock aquifers
No abstract available.
Authors
Judith Robinson, Timothy Johnosn, Lee Slater, Dimitrios Ntarlagiannis, Pierre Lacombe, Frederick D. Day-Lewis, John W. Lane, Carole D. Johnson, Allen M. Shapiro, Claire R. Tiedeman, Daniel J. Goode
Multiple well-shutdown tests and site-scale flow simulation in fractured rocks
A new method was developed for conducting aquifer tests in fractured-rock flow systems that have a pump-and-treat (P&T) operation for containing and removing groundwater contaminants. The method involves temporary shutdown of individual pumps in wells of the P&T system. Conducting aquifer tests in this manner has several advantages, including (1) no additional contaminated water is withdrawn, and
Authors
Claire R. Tiedeman, Pierre J. Lacombe, Daniel J. Goode
Biochemical indicators for the bioavailability of organic carbon in ground water
The bioavailability of total organic carbon (TOC) was examined in ground water from two hydrologically distinct aquifers using biochemical indicators widely employed in chemical oceanography. Concentrations of total hydrolyzable neutral sugars (THNS), total hydrolyzable amino acids (THAA), and carbon‐normalized percentages of TOC present as THNS and THAA (referred to as “yields”) were assessed as
Authors
F. H. Chapelle, P. M. Bradley, D.J. Goode, C. Tiedeman, P.J. Lacombe, K. Kaiser, R. Benner
Contamination in fractured-rock aquifers: Research at the former Naval Air Warfare Center, West Trenton, New Jersey
The U.S. Geological Survey and cooperators are studying chlorinated solvents in a fractured sedimentary rock aquifer underlying the former Naval Air Warfare Center (NAWC), West Trenton, New Jersey. Fractured-rock aquifers are common in many parts of the United States and are highly susceptible to contamination, particularly at industrial sites. Compared to 'unconsolidated' aquifers, there can be m
Authors
Daniel J. Goode, Claire R. Tiedeman, Pierre J. Lacombe, Thomas E. Imbrigiotta, Allen M. Shapiro, Francis H. Chapelle
OPR-PPR, a computer program for assessing data importance to model predictions using linear statistics
The OPR-PPR program calculates the Observation-Prediction (OPR) and Parameter-Prediction (PPR) statistics that can be used to evaluate the relative importance of various kinds of data to simulated predictions. The data considered fall into three categories: (1) existing observations, (2) potential observations, and (3) potential information about parameters. The first two are addressed by the OPR
Authors
Matthew J. Tonkin, Claire R. Tiedeman, D. Matthew Ely, Mary C. Hill
Model calibration and issues related to validation, sensitivity analysis, post-audit, uncertainty evaluation and assessment of prediction data needs
When simulating natural and engineered groundwater flow and transport systems, one objective is to produce a model that accurately represents important aspects of the true system. However, using direct measurements of system characteristics, such as hydraulic conductivity, to construct a model often produces simulated values that poorly match observations of the system state, such as hydraulic hea
Authors
Claire R. Tiedeman, Mary C. Hill
Effective groundwater model calibration: With analysis of data, sensitivities, predictions, and uncertainty
Methods and guidelines for developing and using mathematical modelsTurn to Effective Groundwater Model Calibration for a set of methods and guidelines that can help produce more accurate and transparent mathematical models. The models can represent groundwater flow and transport and other natural and engineered systems. Use this book and its extensive exercises to learn methods to fully exploit th
Authors
Mary C. Hill, Claire R. Tiedeman
Science and Products
Filter Total Items: 40
Effect of correlated observation error on parameters, predictions, and uncertainty
Correlations among observation errors are typically omitted when calculating observation weights for model calibration by inverse methods. We explore the effects of omitting these correlations on estimates of parameters, predictions, and uncertainties. First, we develop a new analytical expression for the difference in parameter variance estimated with and without error correlations for a simple o
Authors
Claire R. Tiedeman, Christopher T. Green
Knowledge, transparency, and refutability in groundwater models, an example from the Death Valley regional groundwater flow system
This work demonstrates how available knowledge can be used to build more transparent and refutable computer models of groundwater systems. The Death Valley regional groundwater flow system, which surrounds a proposed site for a high level nuclear waste repository of the United States of America, and the Nevada National Security Site (NNSS), where nuclear weapons were tested, is used to explore mod
Authors
Mary C. Hill, Claudia C. Faunt, Wayne Belcher, Donald S. Sweetkind, Claire R. Tiedeman, Dmitri Kavetski
Groundwater flow and water budget in the surficial and Floridan aquifer systems in east-central Florida
A numerical transient model of the surficial and Floridan aquifer systems in east-central Florida was developed to (1) increase the understanding of water exchanges between the surficial and the Floridan aquifer systems, (2) assess the recharge rates to the surficial aquifer system from infiltration through the unsaturated zone and (3) obtain a simulation tool that could be used by water-resource
Authors
Nicasio Sepúlveda, Claire R. Tiedeman, Andrew M. O'Reilly, Jeffrey B. Davis, Patrick Burger
Groundwater flow and water budget in the surficial and Floridan aquifer systems in east-central Florida
A numerical transient model of the surficial and Floridan aquifer systems in east-central Florida was developed to (1) increase the understanding of water exchanges between the surficial and the Floridan aquifer systems, (2) assess the recharge rates to the surficial aquifer system from infiltration through the unsaturated zone and (3) obtain a simulation tool that could be used by water-resource
Authors
Nicasio Sepúlveda, Claire R. Tiedeman, Andrew M. O'Reilly, Jeffery B. Davis, Patrick Burger
Enhanced dichloroethene biodegradation in fractured rock under biostimulated and bioaugmented conditions
Significant microbial reductive dechlorination of [1,2 14C] cis-dichloroethene (DCE) was observed in anoxic microcosms prepared with unamended, fractured rock aquifer materials, which were colonized in situ at multiple depths in two boreholes at the Naval Air Warfare Center (NAWC) in West Trenton, New Jersey. The lack of significant reductive dechlorination in corresponding water-only treatments i
Authors
Paul M. Bradley, Celeste A. Journey, Julie D. Kirshtein, Mary A. Voytek, Pierre J. Lacombe, Thomas E. Imbrigiotta, Francis H. Chapelle, Claire R. Tiedeman, Daniel J. Goode
Advancing electrical geophysical characterization of DNAPL-contaminated fractured rock aquifers
No abstract available.
Authors
Judith Robinson, Timothy Johnosn, Lee Slater, Dimitrios Ntarlagiannis, Pierre Lacombe, Frederick D. Day-Lewis, John W. Lane, Carole D. Johnson, Allen M. Shapiro, Claire R. Tiedeman, Daniel J. Goode
Multiple well-shutdown tests and site-scale flow simulation in fractured rocks
A new method was developed for conducting aquifer tests in fractured-rock flow systems that have a pump-and-treat (P&T) operation for containing and removing groundwater contaminants. The method involves temporary shutdown of individual pumps in wells of the P&T system. Conducting aquifer tests in this manner has several advantages, including (1) no additional contaminated water is withdrawn, and
Authors
Claire R. Tiedeman, Pierre J. Lacombe, Daniel J. Goode
Biochemical indicators for the bioavailability of organic carbon in ground water
The bioavailability of total organic carbon (TOC) was examined in ground water from two hydrologically distinct aquifers using biochemical indicators widely employed in chemical oceanography. Concentrations of total hydrolyzable neutral sugars (THNS), total hydrolyzable amino acids (THAA), and carbon‐normalized percentages of TOC present as THNS and THAA (referred to as “yields”) were assessed as
Authors
F. H. Chapelle, P. M. Bradley, D.J. Goode, C. Tiedeman, P.J. Lacombe, K. Kaiser, R. Benner
Contamination in fractured-rock aquifers: Research at the former Naval Air Warfare Center, West Trenton, New Jersey
The U.S. Geological Survey and cooperators are studying chlorinated solvents in a fractured sedimentary rock aquifer underlying the former Naval Air Warfare Center (NAWC), West Trenton, New Jersey. Fractured-rock aquifers are common in many parts of the United States and are highly susceptible to contamination, particularly at industrial sites. Compared to 'unconsolidated' aquifers, there can be m
Authors
Daniel J. Goode, Claire R. Tiedeman, Pierre J. Lacombe, Thomas E. Imbrigiotta, Allen M. Shapiro, Francis H. Chapelle
OPR-PPR, a computer program for assessing data importance to model predictions using linear statistics
The OPR-PPR program calculates the Observation-Prediction (OPR) and Parameter-Prediction (PPR) statistics that can be used to evaluate the relative importance of various kinds of data to simulated predictions. The data considered fall into three categories: (1) existing observations, (2) potential observations, and (3) potential information about parameters. The first two are addressed by the OPR
Authors
Matthew J. Tonkin, Claire R. Tiedeman, D. Matthew Ely, Mary C. Hill
Model calibration and issues related to validation, sensitivity analysis, post-audit, uncertainty evaluation and assessment of prediction data needs
When simulating natural and engineered groundwater flow and transport systems, one objective is to produce a model that accurately represents important aspects of the true system. However, using direct measurements of system characteristics, such as hydraulic conductivity, to construct a model often produces simulated values that poorly match observations of the system state, such as hydraulic hea
Authors
Claire R. Tiedeman, Mary C. Hill
Effective groundwater model calibration: With analysis of data, sensitivities, predictions, and uncertainty
Methods and guidelines for developing and using mathematical modelsTurn to Effective Groundwater Model Calibration for a set of methods and guidelines that can help produce more accurate and transparent mathematical models. The models can represent groundwater flow and transport and other natural and engineered systems. Use this book and its extensive exercises to learn methods to fully exploit th
Authors
Mary C. Hill, Claire R. Tiedeman