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
No Result Found
Filter Total Items: 134
Controls on old and new water contributions to stream flow at some nested catchments in Vermont, USA Controls on old and new water contributions to stream flow at some nested catchments in Vermont, USA
Factors controlling the partitioning of old and new water contributions to stream flow were investigated for three events in four catchments (three of which were nested) at Sleepers River Research Watershed in Danville, Vermont. In the 1993 snowmelt period, two-component isotopic hydrograph separations showed that new water (meltwater) inputs to the stream ranged widely from 41 to 74%...
Authors
J. B. Shanley, C. Kendall, T. E. Smith, D.M. Wolock, Jeffery J. McDonnell
Trends and temperature sensitivity of moisture conditions in the conterminous United States Trends and temperature sensitivity of moisture conditions in the conterminous United States
Observed (1895-1999) trends in climatic moisture conditions in the conterminous United States (US) characterized by (1) annual precipitation minus annual potential evapotranspiration (PMPE), (2) annual surplus (water that eventually becomes streamflow), and (3) annual deficit (the amount of water that must be supplied by irrigation to grow vegetation at an optimum rate) are examined. The
Authors
G.J. McCabe, D.M. Wolock
Spatial and statistical differences between 1:250,000- and 1:24,000-scale digital soil databases Spatial and statistical differences between 1:250,000- and 1:24,000-scale digital soil databases
In this study, 1:250,000- and 1:24,000-scale digital soil databases for Kansas were compared statistically and spatially. The soil attributes used in this comparison were soil permeability, percent clay, and hydrologic group. Results indicate that, although the two databases were correlated, the potential exists for substantial site-specific variability between them. The largest...
Authors
K. E. Juracek, D.M. Wolock
Differences in topographic characteristics computed from 100- and 1000-m resolution digital elevation model data Differences in topographic characteristics computed from 100- and 1000-m resolution digital elevation model data
Topographic characteristics computed from 100- and 1000-m resolution digital elevation model (DEM) data are compared for 50 locations representing varied terrain in the conterminous USA. The topographic characteristics are three parameters used extensively in hydrological research and modelling - slope (S), specific catchment area (A(s)) and a wetness index computed as the logarithm of...
Authors
D.M. Wolock, G.J. McCabe
General-circulation-model simulations of future snowpack in the western United States General-circulation-model simulations of future snowpack in the western United States
April 1 snowpack accumulations measured at 311 snow courses in the western United States (U.S.) are grouped using a correlation-based cluster analysis. A conceptual snow accumulation and melt model and monthly temperature and precipitation for each cluster are used to estimate cluster-average April 1 snowpack. The conceptual snow model is subsequently used to estimate future snowpack by...
Authors
G.J. McCabe, D.M. Wolock
Estimates of runoff using water-balance and atmospheric general circulation models Estimates of runoff using water-balance and atmospheric general circulation models
The effects of potential climate change on mean annual runoff in the conterminous United States (U.S.) are examined using a simple water-balance model and output from two atmospheric general circulation models (GCMs). The two GCMs are from the Canadian Centre for Climate Prediction and Analysis (CCC) and the Hadley Centre for Climate Prediction and Research (HAD). In general, the CCC GCM...
Authors
D.M. Wolock, G.J. McCabe
Explaining spatial variability in mean annual runoff in the conterminous United States Explaining spatial variability in mean annual runoff in the conterminous United States
The hydrologic concepts needed in a water-balance model to estimate the spatial variation in mean annual runoff for the 344 climate divisions in the conterminous United States (U.S.) were determined. The concepts that were evaluated were the climatic supply of water (precipitation), climatic demand for water (potential evapotranspiration), seasonality in supply and demand, and soil...
Authors
David M. Wolock, Gregory J. McCabe
Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds
No abstract available.
Authors
Yvonne H. Baevsky, Gregory B. Lawrence, David M. Wolock, Douglas A. Burns, Peter S. Murdoch
Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York
The effects of basin size on low-flow stream chemistry and subsurface contact time were examined for a part of the Neversink River watershed in southern New York State. Acid neutralizing capacity (ANC), the sum of base cation concentrations (SBC), pH and concentrations of total aluminum (Al), dissolved organic carbon (DOC) and silicon (Si) were measured during low stream flow at the...
Authors
D.M. Wolock, J. Fan, G.B. Lawrence
Climate change and the detection of trends in annual runoff Climate change and the detection of trends in annual runoff
This study examines the statistical likelihood of detecting a trend in annual runoff given an assumed change in mean annual runoff, the underlying year-to-year variability in runoff, and serial correlation of annual runoff. Means, standard deviations, and lag-1 serial correlations of annual runoff were computed for 585 stream gages in the conterminous United States, and these statistics...
Authors
G. J. McCabe, D.M. Wolock
Scale and modeling issues in water resources planning Scale and modeling issues in water resources planning
Resource planners and managers interested in utilizing climate model output as part of their operational activities immediately confront the dilemma of scale discordance. Their functional responsibilities cover relatively small geographical areas and necessarily require data of relatively high spatial resolution. Climate models cover a large geographical, i.e. global, domain and produce...
Authors
H.F. Lins, D.M. Wolock, G.J. McCabe
STATSGO soil characteristics for the conterminous United States STATSGO soil characteristics for the conterminous United States
This digital data release consists of an ARC/INFO grid and associated INFO tables. The grid is called MUID and has STATSGO (U.S. Department of Agriculture, 1994) soil mapping unit identifiers gridded on a 1-kilometer resolution for the conterminous United States. The INFO tables have soil characteristics data in them. The ITEMS in the tables are weighted average values for several soil
Authors
David M. Wolock
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Controls on old and new water contributions to stream flow at some nested catchments in Vermont, USA Controls on old and new water contributions to stream flow at some nested catchments in Vermont, USA
Factors controlling the partitioning of old and new water contributions to stream flow were investigated for three events in four catchments (three of which were nested) at Sleepers River Research Watershed in Danville, Vermont. In the 1993 snowmelt period, two-component isotopic hydrograph separations showed that new water (meltwater) inputs to the stream ranged widely from 41 to 74%...
Authors
J. B. Shanley, C. Kendall, T. E. Smith, D.M. Wolock, Jeffery J. McDonnell
Trends and temperature sensitivity of moisture conditions in the conterminous United States Trends and temperature sensitivity of moisture conditions in the conterminous United States
Observed (1895-1999) trends in climatic moisture conditions in the conterminous United States (US) characterized by (1) annual precipitation minus annual potential evapotranspiration (PMPE), (2) annual surplus (water that eventually becomes streamflow), and (3) annual deficit (the amount of water that must be supplied by irrigation to grow vegetation at an optimum rate) are examined. The
Authors
G.J. McCabe, D.M. Wolock
Spatial and statistical differences between 1:250,000- and 1:24,000-scale digital soil databases Spatial and statistical differences between 1:250,000- and 1:24,000-scale digital soil databases
In this study, 1:250,000- and 1:24,000-scale digital soil databases for Kansas were compared statistically and spatially. The soil attributes used in this comparison were soil permeability, percent clay, and hydrologic group. Results indicate that, although the two databases were correlated, the potential exists for substantial site-specific variability between them. The largest...
Authors
K. E. Juracek, D.M. Wolock
Differences in topographic characteristics computed from 100- and 1000-m resolution digital elevation model data Differences in topographic characteristics computed from 100- and 1000-m resolution digital elevation model data
Topographic characteristics computed from 100- and 1000-m resolution digital elevation model (DEM) data are compared for 50 locations representing varied terrain in the conterminous USA. The topographic characteristics are three parameters used extensively in hydrological research and modelling - slope (S), specific catchment area (A(s)) and a wetness index computed as the logarithm of...
Authors
D.M. Wolock, G.J. McCabe
General-circulation-model simulations of future snowpack in the western United States General-circulation-model simulations of future snowpack in the western United States
April 1 snowpack accumulations measured at 311 snow courses in the western United States (U.S.) are grouped using a correlation-based cluster analysis. A conceptual snow accumulation and melt model and monthly temperature and precipitation for each cluster are used to estimate cluster-average April 1 snowpack. The conceptual snow model is subsequently used to estimate future snowpack by...
Authors
G.J. McCabe, D.M. Wolock
Estimates of runoff using water-balance and atmospheric general circulation models Estimates of runoff using water-balance and atmospheric general circulation models
The effects of potential climate change on mean annual runoff in the conterminous United States (U.S.) are examined using a simple water-balance model and output from two atmospheric general circulation models (GCMs). The two GCMs are from the Canadian Centre for Climate Prediction and Analysis (CCC) and the Hadley Centre for Climate Prediction and Research (HAD). In general, the CCC GCM...
Authors
D.M. Wolock, G.J. McCabe
Explaining spatial variability in mean annual runoff in the conterminous United States Explaining spatial variability in mean annual runoff in the conterminous United States
The hydrologic concepts needed in a water-balance model to estimate the spatial variation in mean annual runoff for the 344 climate divisions in the conterminous United States (U.S.) were determined. The concepts that were evaluated were the climatic supply of water (precipitation), climatic demand for water (potential evapotranspiration), seasonality in supply and demand, and soil...
Authors
David M. Wolock, Gregory J. McCabe
Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds
No abstract available.
Authors
Yvonne H. Baevsky, Gregory B. Lawrence, David M. Wolock, Douglas A. Burns, Peter S. Murdoch
Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York
The effects of basin size on low-flow stream chemistry and subsurface contact time were examined for a part of the Neversink River watershed in southern New York State. Acid neutralizing capacity (ANC), the sum of base cation concentrations (SBC), pH and concentrations of total aluminum (Al), dissolved organic carbon (DOC) and silicon (Si) were measured during low stream flow at the...
Authors
D.M. Wolock, J. Fan, G.B. Lawrence
Climate change and the detection of trends in annual runoff Climate change and the detection of trends in annual runoff
This study examines the statistical likelihood of detecting a trend in annual runoff given an assumed change in mean annual runoff, the underlying year-to-year variability in runoff, and serial correlation of annual runoff. Means, standard deviations, and lag-1 serial correlations of annual runoff were computed for 585 stream gages in the conterminous United States, and these statistics...
Authors
G. J. McCabe, D.M. Wolock
Scale and modeling issues in water resources planning Scale and modeling issues in water resources planning
Resource planners and managers interested in utilizing climate model output as part of their operational activities immediately confront the dilemma of scale discordance. Their functional responsibilities cover relatively small geographical areas and necessarily require data of relatively high spatial resolution. Climate models cover a large geographical, i.e. global, domain and produce...
Authors
H.F. Lins, D.M. Wolock, G.J. McCabe
STATSGO soil characteristics for the conterminous United States STATSGO soil characteristics for the conterminous United States
This digital data release consists of an ARC/INFO grid and associated INFO tables. The grid is called MUID and has STATSGO (U.S. Department of Agriculture, 1994) soil mapping unit identifiers gridded on a 1-kilometer resolution for the conterminous United States. The INFO tables have soil characteristics data in them. The ITEMS in the tables are weighted average values for several soil
Authors
David M. Wolock