Skip to main content
U.S. flag

An official website of the United States government

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: 126

Simulated effects of climatic change on runoff and drought in the Delaware River Basin

Various projection of climatic change were applied to watershed models of the Delaware River basin. Simulations indicate that a warming could reduce annual runoff by as much as 25 percent if current precipitation patterns continue. Simulations indicate that the largest changes in basin drought are in response to relatively small changes in precipitation. Basin drought was less sensitive to increas
Authors
Mark A. Ayers, Gary D. Tasker, David M. Wolock, Gregory J. McCabe, Lauren E. Hay
By
Kansas Water Science Center

Topographic effects on flow path and surface water chemistry of the Llyn Brianne catchments in Wales

Topographic shape is a watershed attribute thought to influence the flow path followed by water as it traverses a catchment. Flow path, in turn, may affect the chemical composition of surface waters. Topography is quantified in the hydrological model TOPMODEL as the relative frequency distribution of the index ln( a tanB), where a is the upslope area per unit contour that drains past a point and t
Authors
D. M. Wolock, G.M. Hornberger, T.J. Musgrove
By
Kansas Water Science Center

Extraction of terrain features from digital elevation models

Digital elevation models (DEMs) are being used to determine variable inputs for hydrologic models in the Delaware River basin. Recently developed software for analysis of DEMs has been applied to watershed and streamline delineation. The results compare favorably with similar delineations taken from topographic maps. Additionally, output from this software has been used to extract other hydrologic
Authors
Curtis V. Price, David M. Wolock, Mark A. Ayers

Simulation of precipitation by weather-type analysis

A new approach that uses weather-type analysis as a basis for stochastic precipitation modeling was developed and tested for Philadelphia, Pennsylvania. The weather types permit the identification of weather conditions associated with varying frequencies, intensities, and amounts of precipitation. Weather-type frequencies were used to stochastically simulate precipitation for Philadelphia and to p
Authors
G. J. McCabe, L.E. Hay, L.S. Kalkstein, M. A. Ayers, D. M. Wolock
By
Kansas Water Science Center

Effect of climate change on watershed runoff

This paper examines forecasts of changes in watershed runoff in the Delaware River basin that result from a range of predicted effects of increased atmospheric carbon dioxide (CO2) on future precipitation, temperature, and stomatal resistance of plants. A deterministic hydrologic model, TOPMODEL, was driven with stochastic inputs of temperature and precipitation to derive the forecasts. Results in
Authors
D. M. Wolock, M. A. Ayers, L.E. Hay, G. J. McCabe

The relationship of catchment topography and soil hydraulic characteristics to lake alkalinity in the northeastern United States

We undertook the task of determining whether base flow alkalinity of surface waters in the northeastern United States is related to indices of soil contact time and flow path partitioning that are derived from topographic and soils information. The influence of topography and soils on catchment hydrology has been incorporated previously in the variable source area model TOPMODEL as the relative fr
Authors
D. M. Wolock, G.M. Hornberger, K.J. Beven, W.G. Campbell

Science and Products

  • Science
  • Data
    Filter Total Items: 13
    No Result Found
  • Publications
    Filter Total Items: 126

    Simulated effects of climatic change on runoff and drought in the Delaware River Basin

    Various projection of climatic change were applied to watershed models of the Delaware River basin. Simulations indicate that a warming could reduce annual runoff by as much as 25 percent if current precipitation patterns continue. Simulations indicate that the largest changes in basin drought are in response to relatively small changes in precipitation. Basin drought was less sensitive to increas
    Authors
    Mark A. Ayers, Gary D. Tasker, David M. Wolock, Gregory J. McCabe, Lauren E. Hay
    By
    Kansas Water Science Center

    Topographic effects on flow path and surface water chemistry of the Llyn Brianne catchments in Wales

    Topographic shape is a watershed attribute thought to influence the flow path followed by water as it traverses a catchment. Flow path, in turn, may affect the chemical composition of surface waters. Topography is quantified in the hydrological model TOPMODEL as the relative frequency distribution of the index ln( a tanB), where a is the upslope area per unit contour that drains past a point and t
    Authors
    D. M. Wolock, G.M. Hornberger, T.J. Musgrove
    By
    Kansas Water Science Center

    Extraction of terrain features from digital elevation models

    Digital elevation models (DEMs) are being used to determine variable inputs for hydrologic models in the Delaware River basin. Recently developed software for analysis of DEMs has been applied to watershed and streamline delineation. The results compare favorably with similar delineations taken from topographic maps. Additionally, output from this software has been used to extract other hydrologic
    Authors
    Curtis V. Price, David M. Wolock, Mark A. Ayers

    Simulation of precipitation by weather-type analysis

    A new approach that uses weather-type analysis as a basis for stochastic precipitation modeling was developed and tested for Philadelphia, Pennsylvania. The weather types permit the identification of weather conditions associated with varying frequencies, intensities, and amounts of precipitation. Weather-type frequencies were used to stochastically simulate precipitation for Philadelphia and to p
    Authors
    G. J. McCabe, L.E. Hay, L.S. Kalkstein, M. A. Ayers, D. M. Wolock
    By
    Kansas Water Science Center

    Effect of climate change on watershed runoff

    This paper examines forecasts of changes in watershed runoff in the Delaware River basin that result from a range of predicted effects of increased atmospheric carbon dioxide (CO2) on future precipitation, temperature, and stomatal resistance of plants. A deterministic hydrologic model, TOPMODEL, was driven with stochastic inputs of temperature and precipitation to derive the forecasts. Results in
    Authors
    D. M. Wolock, M. A. Ayers, L.E. Hay, G. J. McCabe

    The relationship of catchment topography and soil hydraulic characteristics to lake alkalinity in the northeastern United States

    We undertook the task of determining whether base flow alkalinity of surface waters in the northeastern United States is related to indices of soil contact time and flow path partitioning that are derived from topographic and soils information. The influence of topography and soils on catchment hydrology has been incorporated previously in the variable source area model TOPMODEL as the relative fr
    Authors
    D. M. Wolock, G.M. Hornberger, K.J. Beven, W.G. Campbell
  • News