Robert Dudley
Robert Dudley is a Supervisory Hydrologist in the New England Water Science Center.
As Chief of the Statistical and Geospatial Section, New England Water Science Center, Rob manages a diverse team of scientists involved in a wide range of interpretive water-resources investigations that include water use, quantity, and quality, geospatial applications, and remote sensing. His project work has focused on regional and national-scale statistical investigations of trends and variability of surface waters and groundwaters, and developing methods for estimating river flow using satellite imagery and altimetry data.
Professional Experience
Supervisory Hydrologist, U.S. Geological Survey, New England Water Science Center, 2021 to Present
Hydrologist, U.S. Geological Survey, New England Water Science Center, 1998 to 2021
Education and Certifications
Licensed Professional Engineer, State of Maine, 2002 to Present
M.S. Civil & Environmental Engineering, University of Maine, 1998
B.S. Mechanical Engineering, University of Maine, 1994
Honors and Awards
Department of Interior Secretary’s Diversity Award Special Emphasis Program Achievement, DOI, 2000
Joseph Seifter Award for Human Health Risk Assessment, USEPA, 2014
Science and Products
Filter Total Items: 80
Comparing trends in modeled and observed streamflows at minimally altered basins in the United States Comparing trends in modeled and observed streamflows at minimally altered basins in the United States
We compared modeled and observed streamflow trends from 1984–2016 using five statistical transfer models and one deterministic, distributed-parameter, process-based model, for 26 flow metrics at 502 basins in the United States that are minimally influenced by development. We also looked at a measure of overall model fit and average bias. A higher percentage of basins, for all models, had
Authors
Glenn A. Hodgkins, Robert W. Dudley, Amy M. Russell, Jacob H. LaFontaine
Atlantic Salmon (Salmo salar) climate scenario planning pilot report Atlantic Salmon (Salmo salar) climate scenario planning pilot report
Scenario planning is a structured process that embraces uncertainty and explores plausible alternative future conditions under different assumptions to help manage risk and prioritize actions ( Schwartz 1996, Peterson et al. 2003). It has been used by a variety of organizations to explore and help prepare for the future, lends itself well to exploring the uncertainty surrounding changing
Authors
Diane Borggaard, Dori Dick, Jonathan Star, Mike Alexander, M. Bernier, Matt Collins, Kelly Damon-Randall, Robert W. Dudley, Roger Roger Griffis, Sean Hayes, Mike Johnson, Dan Kircheis, John Kocik, Benjamin Letcher, Nate Mantua, Wendy Morrison, Keith Nislow, Vince Saba, R. Saunders, Tim Sheehan, Michelle D. Staudinger
Change points in annual peak streamflows: Method comparisons and historical change points in the United States Change points in annual peak streamflows: Method comparisons and historical change points in the United States
Change-point, or step-trend, detection is an active area of research in statistics and an area of great interest in hydrology because change points may be evidence of natural or anthropogenic changes in climatic, hydrologic, or landscape processes. A common change-point technique is the Pettitt test; however, many change-point methods are now available and testing of methods has been...
Authors
Karen R. Ryberg, Glenn A. Hodgkins, Robert W. Dudley
Low streamflow trends at human-impacted and reference basins in the United States Low streamflow trends at human-impacted and reference basins in the United States
We present a continent-scale exploration of trends in annual 7-day low streamflows at 2482 U.S. Geological Survey streamgages across the conterminous United States over the past 100, 75, and 50 years (1916–2015, 1941–2015 and 1966–2015). We used basin characteristics to identify subsets of study basins representative of reference basins with streamflow relatively free from human effects...
Authors
Robert W. Dudley, Robert M. Hirsch, Stacey A. Archfield, Annalise G. Blum, Benjamin Renard
Updating estimates of low-streamflow statistics to account for possible trends Updating estimates of low-streamflow statistics to account for possible trends
Accurate estimators of streamflow statistics are critical to the design, planning, and management of water resources. Given increasing evidence of trends in low-streamflow, new approaches to estimating low-streamflow statistics are needed. Here we investigate simple approaches to select a recent subset of the low-flow record to update the commonly used statistic of 7Q10, the annual...
Authors
Annalise G. Blum, Stacey A. Archfield, Robert M. Hirsch, Richard M Vogel, Julie E. Kiang, Robert W. Dudley
Drought forecasting for streams and groundwaters in northeastern United States Drought forecasting for streams and groundwaters in northeastern United States
Background When rainfall is lower than normal over an extended period, streamflows decline, groundwater levels fall, and hydrological drought can occur. Droughts can reduce the water available for societal needs, such as public and private drinking-water supplies, farming, and industry, and for ecological health, such as maintenance of water quality and natural ecosystems. Recent...
Authors
Samuel H. Austin, Robert W. Dudley
Non-USGS Publications**
Dudley, R.W., Panchang, V.G., and Newell, C.R., 2000. Application of a comprehensive modeling strategy for the management of net-pen aquaculture waste transport: Aquaculture, Elsevier Science, (187) 3-4 (2000) p. 319-349.
Dudley, R.W., Panchang, V.G., Newell, C.R., 1998. AWATS: A Net-Pen Aquaculture Waste Transport Simulator for Management Purposes: Proceedings of the twenty-sixth US-Japan Aquaculture Symposium, Durham, New Hampshire, September 16-18, 1997, US-Japan Cooperative Program in Natural Resources (UJNR) Technical Report no. 26, Ed. W. H. Howell et al., NOAA Central Library Call Number: SH3 .U5 1998, pp 215-228.
**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.
Filter Total Items: 22
Trends in 7-day-low streamflows at 174 USGS streamflow gages in the Chesapeake Bay watershed, Mid-Atlantic U.S. Trends in 7-day-low streamflows at 174 USGS streamflow gages in the Chesapeake Bay watershed, Mid-Atlantic U.S.
This data set contains U.S. Geological Survey (USGS) streamgage identification numbers, begin and end years of the periods of streamflow record tested, Sen slope trends in the annual minimum 7-day streamflow for the period of record tested, the p-values (significance) of the trends, and the trend Sen slopes standardized by the standard deviations of the residual errors defined as the...
Low-streamflow trends and basin characteristics for 2,482 U.S. Geological Survey streamgages in the conterminous U.S. Low-streamflow trends and basin characteristics for 2,482 U.S. Geological Survey streamgages in the conterminous U.S.
This data release contains drainage basin characteristics and low-streamflow trend results for 2,482 U.S. Geological Survey (USGS) streamgages in the conterminous U.S. Data include streamgage identification number, name, drainage area, latitude, longitude, percent developed land use, percent crop land use, dam storage, streamgage classification, record completeness status, and trend...
Data related to the degree of potential human influence near 2228 groundwater wells in the U.S. glacial aquifer system Data related to the degree of potential human influence near 2228 groundwater wells in the U.S. glacial aquifer system
This dataset contains information on the degree of potential human influence near 2228 groundwater wells in the U.S. glacial aquifer system. Data include well identification, name, latitude, longitude, potential-human-influence category, percent urban and crop land use in a 500 meter radius around each well, and measures of county-based groundwater use and irrigation.
Velocity, depth, and selected water quality profiles of the Lower Penobscot River Estuary in Maine, 2017 Velocity, depth, and selected water quality profiles of the Lower Penobscot River Estuary in Maine, 2017
This data release includes transect data comprising velocity and depths collected by use of an acoustic-doppler current profiler (ADCP), and vertical profile data comprising conductivity, temperature, and depth by use of a conductivity, temperature, and depth (CTD) instrument, as well as tide elevation data at specified locations in the lower Penobscot River and Penobscot Bay (the...
Model climate scenario output for the Farmington river basin, Connecticut and Massachusetts, 2036-2065 change from 1975-2004, Representative Concentration Pathways 4.5 and 8.5 Model climate scenario output for the Farmington river basin, Connecticut and Massachusetts, 2036-2065 change from 1975-2004, Representative Concentration Pathways 4.5 and 8.5
This data release provides a set of Hydrological Simulation Program--Fortran (HSPF) model files representing five EPA-selected future climate change scenarios for the Farmington River Basin in Massachusetts and Connecticut. Output from these models are intended for use as input to EPA Watershed Management Optimization Support Tool (WMOST) modeling. Climate scenarios, based on 2036-2065...
Generalized linear models and input data for forecasting the probability of groundwater levels declining below specified low thresholds for the conterminous U.S. Generalized linear models and input data for forecasting the probability of groundwater levels declining below specified low thresholds for the conterminous U.S.
This dataset contains model parameters and input data (.rdata files) for 258 models derived for wells in the conterminous United States. The models are generalized linear models with a binomial response variable (logistic regression) for forecasting the probability of groundwater levels declining or maintaining below specified low thresholds for any time of the year for forecast time...
Science and Products
Filter Total Items: 80
Comparing trends in modeled and observed streamflows at minimally altered basins in the United States Comparing trends in modeled and observed streamflows at minimally altered basins in the United States
We compared modeled and observed streamflow trends from 1984–2016 using five statistical transfer models and one deterministic, distributed-parameter, process-based model, for 26 flow metrics at 502 basins in the United States that are minimally influenced by development. We also looked at a measure of overall model fit and average bias. A higher percentage of basins, for all models, had
Authors
Glenn A. Hodgkins, Robert W. Dudley, Amy M. Russell, Jacob H. LaFontaine
Atlantic Salmon (Salmo salar) climate scenario planning pilot report Atlantic Salmon (Salmo salar) climate scenario planning pilot report
Scenario planning is a structured process that embraces uncertainty and explores plausible alternative future conditions under different assumptions to help manage risk and prioritize actions ( Schwartz 1996, Peterson et al. 2003). It has been used by a variety of organizations to explore and help prepare for the future, lends itself well to exploring the uncertainty surrounding changing
Authors
Diane Borggaard, Dori Dick, Jonathan Star, Mike Alexander, M. Bernier, Matt Collins, Kelly Damon-Randall, Robert W. Dudley, Roger Roger Griffis, Sean Hayes, Mike Johnson, Dan Kircheis, John Kocik, Benjamin Letcher, Nate Mantua, Wendy Morrison, Keith Nislow, Vince Saba, R. Saunders, Tim Sheehan, Michelle D. Staudinger
Change points in annual peak streamflows: Method comparisons and historical change points in the United States Change points in annual peak streamflows: Method comparisons and historical change points in the United States
Change-point, or step-trend, detection is an active area of research in statistics and an area of great interest in hydrology because change points may be evidence of natural or anthropogenic changes in climatic, hydrologic, or landscape processes. A common change-point technique is the Pettitt test; however, many change-point methods are now available and testing of methods has been...
Authors
Karen R. Ryberg, Glenn A. Hodgkins, Robert W. Dudley
Low streamflow trends at human-impacted and reference basins in the United States Low streamflow trends at human-impacted and reference basins in the United States
We present a continent-scale exploration of trends in annual 7-day low streamflows at 2482 U.S. Geological Survey streamgages across the conterminous United States over the past 100, 75, and 50 years (1916–2015, 1941–2015 and 1966–2015). We used basin characteristics to identify subsets of study basins representative of reference basins with streamflow relatively free from human effects...
Authors
Robert W. Dudley, Robert M. Hirsch, Stacey A. Archfield, Annalise G. Blum, Benjamin Renard
Updating estimates of low-streamflow statistics to account for possible trends Updating estimates of low-streamflow statistics to account for possible trends
Accurate estimators of streamflow statistics are critical to the design, planning, and management of water resources. Given increasing evidence of trends in low-streamflow, new approaches to estimating low-streamflow statistics are needed. Here we investigate simple approaches to select a recent subset of the low-flow record to update the commonly used statistic of 7Q10, the annual...
Authors
Annalise G. Blum, Stacey A. Archfield, Robert M. Hirsch, Richard M Vogel, Julie E. Kiang, Robert W. Dudley
Drought forecasting for streams and groundwaters in northeastern United States Drought forecasting for streams and groundwaters in northeastern United States
Background When rainfall is lower than normal over an extended period, streamflows decline, groundwater levels fall, and hydrological drought can occur. Droughts can reduce the water available for societal needs, such as public and private drinking-water supplies, farming, and industry, and for ecological health, such as maintenance of water quality and natural ecosystems. Recent...
Authors
Samuel H. Austin, Robert W. Dudley
Non-USGS Publications**
Dudley, R.W., Panchang, V.G., and Newell, C.R., 2000. Application of a comprehensive modeling strategy for the management of net-pen aquaculture waste transport: Aquaculture, Elsevier Science, (187) 3-4 (2000) p. 319-349.
Dudley, R.W., Panchang, V.G., Newell, C.R., 1998. AWATS: A Net-Pen Aquaculture Waste Transport Simulator for Management Purposes: Proceedings of the twenty-sixth US-Japan Aquaculture Symposium, Durham, New Hampshire, September 16-18, 1997, US-Japan Cooperative Program in Natural Resources (UJNR) Technical Report no. 26, Ed. W. H. Howell et al., NOAA Central Library Call Number: SH3 .U5 1998, pp 215-228.
**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.
Filter Total Items: 22
Trends in 7-day-low streamflows at 174 USGS streamflow gages in the Chesapeake Bay watershed, Mid-Atlantic U.S. Trends in 7-day-low streamflows at 174 USGS streamflow gages in the Chesapeake Bay watershed, Mid-Atlantic U.S.
This data set contains U.S. Geological Survey (USGS) streamgage identification numbers, begin and end years of the periods of streamflow record tested, Sen slope trends in the annual minimum 7-day streamflow for the period of record tested, the p-values (significance) of the trends, and the trend Sen slopes standardized by the standard deviations of the residual errors defined as the...
Low-streamflow trends and basin characteristics for 2,482 U.S. Geological Survey streamgages in the conterminous U.S. Low-streamflow trends and basin characteristics for 2,482 U.S. Geological Survey streamgages in the conterminous U.S.
This data release contains drainage basin characteristics and low-streamflow trend results for 2,482 U.S. Geological Survey (USGS) streamgages in the conterminous U.S. Data include streamgage identification number, name, drainage area, latitude, longitude, percent developed land use, percent crop land use, dam storage, streamgage classification, record completeness status, and trend...
Data related to the degree of potential human influence near 2228 groundwater wells in the U.S. glacial aquifer system Data related to the degree of potential human influence near 2228 groundwater wells in the U.S. glacial aquifer system
This dataset contains information on the degree of potential human influence near 2228 groundwater wells in the U.S. glacial aquifer system. Data include well identification, name, latitude, longitude, potential-human-influence category, percent urban and crop land use in a 500 meter radius around each well, and measures of county-based groundwater use and irrigation.
Velocity, depth, and selected water quality profiles of the Lower Penobscot River Estuary in Maine, 2017 Velocity, depth, and selected water quality profiles of the Lower Penobscot River Estuary in Maine, 2017
This data release includes transect data comprising velocity and depths collected by use of an acoustic-doppler current profiler (ADCP), and vertical profile data comprising conductivity, temperature, and depth by use of a conductivity, temperature, and depth (CTD) instrument, as well as tide elevation data at specified locations in the lower Penobscot River and Penobscot Bay (the...
Model climate scenario output for the Farmington river basin, Connecticut and Massachusetts, 2036-2065 change from 1975-2004, Representative Concentration Pathways 4.5 and 8.5 Model climate scenario output for the Farmington river basin, Connecticut and Massachusetts, 2036-2065 change from 1975-2004, Representative Concentration Pathways 4.5 and 8.5
This data release provides a set of Hydrological Simulation Program--Fortran (HSPF) model files representing five EPA-selected future climate change scenarios for the Farmington River Basin in Massachusetts and Connecticut. Output from these models are intended for use as input to EPA Watershed Management Optimization Support Tool (WMOST) modeling. Climate scenarios, based on 2036-2065...
Generalized linear models and input data for forecasting the probability of groundwater levels declining below specified low thresholds for the conterminous U.S. Generalized linear models and input data for forecasting the probability of groundwater levels declining below specified low thresholds for the conterminous U.S.
This dataset contains model parameters and input data (.rdata files) for 258 models derived for wells in the conterminous United States. The models are generalized linear models with a binomial response variable (logistic regression) for forecasting the probability of groundwater levels declining or maintaining below specified low thresholds for any time of the year for forecast time...