David M Wolock, Ph.D.
David Wolock is a Supervisory Hydrologist with the USGS Water Resources Mission Area.
Science and Products
Filter Total Items: 13
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Increasing Northern Hemisphere water deficit Increasing Northern Hemisphere water deficit
A monthly water-balance model is used with CRUTS3.1 gridded monthly precipitation and potential evapotranspiration (PET) data to examine changes in global water deficit (PET minus actual evapotranspiration) for the Northern Hemisphere (NH) for the years 1905 through 2009. Results show that NH deficit increased dramatically near the year 2000 during both the cool (October through March)...
Authors
Gregory J. McCabe, David M. Wolock
Sensitivity of intermittent streams to climate variations in the USA Sensitivity of intermittent streams to climate variations in the USA
There is a great deal of interest in the literature on streamflow changes caused by climate change because of the potential negative effects on aquatic biota and water supplies. Most previous studies have primarily focused on perennial streams, and there have been only a few studies examining the effect of climate variability on intermittent streams. Our objectives in this study were to...
Authors
Ken Eng, David M. Wolock, Mike Dettinger
Variability and trends in global drought Variability and trends in global drought
Monthly precipitation (P) and potential evapotranspiration (PET) from the CRUTS3.1 data set are used to compute monthly P minus PET (PMPE) for the land areas of the globe. The percent of the global land area with annual sums of PMPE less than zero are used as an index of global drought (%drought) for 1901 through 2009. Results indicate that for the past century %drought has not changed...
Authors
Gregory J. McCabe, David M. Wolock
Streamflow of 2014: water year summary Streamflow of 2014: water year summary
The maps and graphs in this summary describe streamflow conditions for water year 2014 (October 1, 2013, to September 30, 2014) in the context of the 85-year period from 1930 through 2014, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey’s (USGS) National Streamflow Information Program (NSIP) (http://water.usgs.gov/nsip/). The period...
Authors
Xiaodong Jian, David M. Wolock, Harry L. Jenter, Steve Brady
A new approach for continuous estimation of baseflow using discrete water quality data: Method description and comparison with baseflow estimates from two existing approaches A new approach for continuous estimation of baseflow using discrete water quality data: Method description and comparison with baseflow estimates from two existing approaches
Understanding how watershed characteristics and climate influence the baseflow component of stream discharge is a topic of interest to both the scientific and water management communities. Therefore, the development of baseflow estimation methods is a topic of active research. Previous studies have demonstrated that graphical hydrograph separation (GHS) and conductivity mass balance (CMB...
Authors
Matthew P. Miller, Henry M. Johnson, David D. Susong, David M. Wolock
An objective and parsimonious approach for classifying natural flow regimes at a continental scale An objective and parsimonious approach for classifying natural flow regimes at a continental scale
Hydro-ecological stream classification-the process of grouping streams by similar hydrologic responses and, by extension, similar aquatic habitat-has been widely accepted and is considered by some to be one of the first steps towards developing ecological flow targets. A new classification of 1543 streamgauges in the contiguous USA is presented by use of a novel and parsimonious approach...
Authors
Stacey A. Archfield, Jonathan G. Kennen, Daren M. Carlisle, David M. Wolock
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Increasing Northern Hemisphere water deficit Increasing Northern Hemisphere water deficit
A monthly water-balance model is used with CRUTS3.1 gridded monthly precipitation and potential evapotranspiration (PET) data to examine changes in global water deficit (PET minus actual evapotranspiration) for the Northern Hemisphere (NH) for the years 1905 through 2009. Results show that NH deficit increased dramatically near the year 2000 during both the cool (October through March)...
Authors
Gregory J. McCabe, David M. Wolock
Sensitivity of intermittent streams to climate variations in the USA Sensitivity of intermittent streams to climate variations in the USA
There is a great deal of interest in the literature on streamflow changes caused by climate change because of the potential negative effects on aquatic biota and water supplies. Most previous studies have primarily focused on perennial streams, and there have been only a few studies examining the effect of climate variability on intermittent streams. Our objectives in this study were to...
Authors
Ken Eng, David M. Wolock, Mike Dettinger
Variability and trends in global drought Variability and trends in global drought
Monthly precipitation (P) and potential evapotranspiration (PET) from the CRUTS3.1 data set are used to compute monthly P minus PET (PMPE) for the land areas of the globe. The percent of the global land area with annual sums of PMPE less than zero are used as an index of global drought (%drought) for 1901 through 2009. Results indicate that for the past century %drought has not changed...
Authors
Gregory J. McCabe, David M. Wolock
Streamflow of 2014: water year summary Streamflow of 2014: water year summary
The maps and graphs in this summary describe streamflow conditions for water year 2014 (October 1, 2013, to September 30, 2014) in the context of the 85-year period from 1930 through 2014, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey’s (USGS) National Streamflow Information Program (NSIP) (http://water.usgs.gov/nsip/). The period...
Authors
Xiaodong Jian, David M. Wolock, Harry L. Jenter, Steve Brady
A new approach for continuous estimation of baseflow using discrete water quality data: Method description and comparison with baseflow estimates from two existing approaches A new approach for continuous estimation of baseflow using discrete water quality data: Method description and comparison with baseflow estimates from two existing approaches
Understanding how watershed characteristics and climate influence the baseflow component of stream discharge is a topic of interest to both the scientific and water management communities. Therefore, the development of baseflow estimation methods is a topic of active research. Previous studies have demonstrated that graphical hydrograph separation (GHS) and conductivity mass balance (CMB...
Authors
Matthew P. Miller, Henry M. Johnson, David D. Susong, David M. Wolock
An objective and parsimonious approach for classifying natural flow regimes at a continental scale An objective and parsimonious approach for classifying natural flow regimes at a continental scale
Hydro-ecological stream classification-the process of grouping streams by similar hydrologic responses and, by extension, similar aquatic habitat-has been widely accepted and is considered by some to be one of the first steps towards developing ecological flow targets. A new classification of 1543 streamgauges in the contiguous USA is presented by use of a novel and parsimonious approach...
Authors
Stacey A. Archfield, Jonathan G. Kennen, Daren M. Carlisle, David M. Wolock