Randall J Hunt, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 150
Planning and operations of the Hydrate 01 Stratigraphic Test Well, Prudhoe Bay Unit, Alaska North Slope Planning and operations of the Hydrate 01 Stratigraphic Test Well, Prudhoe Bay Unit, Alaska North Slope
The National Energy Technology Laboratory, the Japan Oil, Gas and Metals National Corporation, and the U.S. Geological Survey are leading an effort to conduct an extended gas hydrate production test in northern Alaska. The proposed production test required the drilling of an initial stratigraphic test well (STW) to confirm the geologic conditions of the proposed test site. This well was...
Authors
Timothy S. Collett, Margarita V. Zyrianova, Norihiro Okinaka, Motoi Wakatsuki, Ray Boswell, Scott Marsteller, David Minge, Stephen Crumley, David Itter, Robert D. Hunter, Ana Garcia-Ceballos, Ge Jin
NWTOPT — A hyperparameter optimization approach for selection of environmental model solver settings NWTOPT — A hyperparameter optimization approach for selection of environmental model solver settings
Hyperparameter optimization approaches were applied to improve performance and accuracy of groundwater flow models. Freely available new software, NWTOPT, is described that uses Tree of Parzen Estimators (TPE) and Random Search algorithms to optimize MODFLOW-NWTs solver settings. We ran 3500 trials on a steady-state and transient model. To quantify the performance of candidate solver...
Authors
Max William Newcomer, Randall J. Hunt
Use case development for earth monitoring, analysis, and prediction (EarthMAP)—A road map for future integrated predictive science at the U.S. Geological Survey Use case development for earth monitoring, analysis, and prediction (EarthMAP)—A road map for future integrated predictive science at the U.S. Geological Survey
Executive Summary The U.S. Geological Survey (USGS) 21st-century science strategy 2020–30 promotes a bureau-wide strategy to develop and deliver an integrated, predictive science capability that works at the scales and timelines needed to inform societally relevant resource management and protection and public safety and environmental health decisions (U.S. Geological Survey, 2021). This...
Authors
Tamara Wilson, Mark T. Wiltermuth, Karen E. Jenni, Robert Horton, Randall J. Hunt, Dee M. Williams, Vivian P. Nolan, Nicholas G. Aumen, David S. Brown, Kyle W. Blasch, Peter S. Murdoch
A scalable model-independent iterative data assimilation tool for sequential and batch estimation of high dimensional model parameters and states A scalable model-independent iterative data assimilation tool for sequential and batch estimation of high dimensional model parameters and states
Ensemble-based data assimilation (DA) methods have displayed strong potential to improve model state and parameter estimation across several disciplines due to their computational efficiency, scalability, and ability to estimate uncertainty in the dynamic states and the parameters. However, a barrier to adoption of ensemble DA methods remains. Namely, there is currently a lack of...
Authors
Ayman H. Alzraiee, Jeremy T. White, Matthew Knowling, Randall J. Hunt, Michael N. Fienen
Groundwater/surface-water interactions in the Partridge River Basin and evaluation of hypothetical future mine pits, Minnesota Groundwater/surface-water interactions in the Partridge River Basin and evaluation of hypothetical future mine pits, Minnesota
The Partridge River Basin (PRB) covers 156 square miles in northeastern Minnesota with headwaters in the Mesabi Iron Range. The basin is characterized by extensive wetlands, lakes, and streams in poorly drained and often thin glacial material overlying Proterozoic bedrock. To better understand the interaction between these extensive surface water features and the groundwater system, a...
Authors
Megan J. Haserodt, Randall J. Hunt, Michael N. Fienen, Daniel T. Feinstein
Pedigree accumulation analysis: Combining methods from community ecology and population genetics for breeding adult estimation Pedigree accumulation analysis: Combining methods from community ecology and population genetics for breeding adult estimation
Estimates of the number of successfully breeding adults (NS) in a population can predict levels of recruitment. However, assessments of NS are often difficult to obtain because encounters with adults are limited due to life-history characteristics, low abundance or other constraints associated with access to critical habitats. Alternatively, efforts to sample individuals at earlier...
Authors
Nicholas Sard, Robert D. Hunter, Edward F. Roseman, Daniel B. Hayes, Robin L . DeBruyne, Kim T Scribner
Non-USGS Publications**
Abrams, D.B., Haitjema, H.M., Feinstein, D.T. and Hunt, R.J., 2015, Field test of a Hybrid Finite-Difference and Analytic Element regional model. Groundwater. doi: 10.1111/gwat.12319.
**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.
Science and Products
Filter Total Items: 150
Planning and operations of the Hydrate 01 Stratigraphic Test Well, Prudhoe Bay Unit, Alaska North Slope Planning and operations of the Hydrate 01 Stratigraphic Test Well, Prudhoe Bay Unit, Alaska North Slope
The National Energy Technology Laboratory, the Japan Oil, Gas and Metals National Corporation, and the U.S. Geological Survey are leading an effort to conduct an extended gas hydrate production test in northern Alaska. The proposed production test required the drilling of an initial stratigraphic test well (STW) to confirm the geologic conditions of the proposed test site. This well was...
Authors
Timothy S. Collett, Margarita V. Zyrianova, Norihiro Okinaka, Motoi Wakatsuki, Ray Boswell, Scott Marsteller, David Minge, Stephen Crumley, David Itter, Robert D. Hunter, Ana Garcia-Ceballos, Ge Jin
NWTOPT — A hyperparameter optimization approach for selection of environmental model solver settings NWTOPT — A hyperparameter optimization approach for selection of environmental model solver settings
Hyperparameter optimization approaches were applied to improve performance and accuracy of groundwater flow models. Freely available new software, NWTOPT, is described that uses Tree of Parzen Estimators (TPE) and Random Search algorithms to optimize MODFLOW-NWTs solver settings. We ran 3500 trials on a steady-state and transient model. To quantify the performance of candidate solver...
Authors
Max William Newcomer, Randall J. Hunt
Use case development for earth monitoring, analysis, and prediction (EarthMAP)—A road map for future integrated predictive science at the U.S. Geological Survey Use case development for earth monitoring, analysis, and prediction (EarthMAP)—A road map for future integrated predictive science at the U.S. Geological Survey
Executive Summary The U.S. Geological Survey (USGS) 21st-century science strategy 2020–30 promotes a bureau-wide strategy to develop and deliver an integrated, predictive science capability that works at the scales and timelines needed to inform societally relevant resource management and protection and public safety and environmental health decisions (U.S. Geological Survey, 2021). This...
Authors
Tamara Wilson, Mark T. Wiltermuth, Karen E. Jenni, Robert Horton, Randall J. Hunt, Dee M. Williams, Vivian P. Nolan, Nicholas G. Aumen, David S. Brown, Kyle W. Blasch, Peter S. Murdoch
A scalable model-independent iterative data assimilation tool for sequential and batch estimation of high dimensional model parameters and states A scalable model-independent iterative data assimilation tool for sequential and batch estimation of high dimensional model parameters and states
Ensemble-based data assimilation (DA) methods have displayed strong potential to improve model state and parameter estimation across several disciplines due to their computational efficiency, scalability, and ability to estimate uncertainty in the dynamic states and the parameters. However, a barrier to adoption of ensemble DA methods remains. Namely, there is currently a lack of...
Authors
Ayman H. Alzraiee, Jeremy T. White, Matthew Knowling, Randall J. Hunt, Michael N. Fienen
Groundwater/surface-water interactions in the Partridge River Basin and evaluation of hypothetical future mine pits, Minnesota Groundwater/surface-water interactions in the Partridge River Basin and evaluation of hypothetical future mine pits, Minnesota
The Partridge River Basin (PRB) covers 156 square miles in northeastern Minnesota with headwaters in the Mesabi Iron Range. The basin is characterized by extensive wetlands, lakes, and streams in poorly drained and often thin glacial material overlying Proterozoic bedrock. To better understand the interaction between these extensive surface water features and the groundwater system, a...
Authors
Megan J. Haserodt, Randall J. Hunt, Michael N. Fienen, Daniel T. Feinstein
Pedigree accumulation analysis: Combining methods from community ecology and population genetics for breeding adult estimation Pedigree accumulation analysis: Combining methods from community ecology and population genetics for breeding adult estimation
Estimates of the number of successfully breeding adults (NS) in a population can predict levels of recruitment. However, assessments of NS are often difficult to obtain because encounters with adults are limited due to life-history characteristics, low abundance or other constraints associated with access to critical habitats. Alternatively, efforts to sample individuals at earlier...
Authors
Nicholas Sard, Robert D. Hunter, Edward F. Roseman, Daniel B. Hayes, Robin L . DeBruyne, Kim T Scribner
Non-USGS Publications**
Abrams, D.B., Haitjema, H.M., Feinstein, D.T. and Hunt, R.J., 2015, Field test of a Hybrid Finite-Difference and Analytic Element regional model. Groundwater. doi: 10.1111/gwat.12319.
**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.
*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