Fluvial Geomorphology of Gravel Bed River Systems,
Penns Creek, Pennsylvania

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Fluvial geomorphologic study of spring-fed gravel bed river to characterize pool-riffle morphology and channel evolution. Developing high-resolution GIS-based hydrogeomorphic model of the stream, including bed and valley slope, channel width and bank height, channel and floodplain sedimentology, and locations bank erosion and gravel bed armoring. Field investigations include survey of channel and valley morphology and sedimentology and measurement of stream velocities, suspended sediment, and bed load transport in pools and riffles. Installed hyporheic zone monitoring wells in selected reaches and conducting sampling of macroinvertebrate population living in channel alluvium and valley fill materials.

3-D Hydrogeospatial Modeling of Underground Coal Mine Complex,
Kempton Mine, Maryland and West Virginia

Investigation of acidic discharges and underground mine pool hydrology of abandoned 9,000-acre underground coal mine. Field mapping and discharge measurements of air shafts, mine openings, and stream sinks. Developing 3D high resolution GIS model to locate portions of the subsurface mine complex, characterize the subsurface hydrogeology and importance of lithologic changes and geologic structure on mine pool hydrology. GIS-based model was then used to estimate recharge rates and delineate areas of concern, and delineate locations for further field investigation.

Hydrogeology of Alluvial Wetlands, Montandon Marsh,
Susquehanna River, Northumberland County, Pennsylvania

Field investigation and numerical model of alluvial aquifer/wetlands system adjacent to Susquehanna River near Lewisburg, Pennsylvania. Developed 3D GIS-based hydrologeologic model of aquifer/wetland/river system, incorporating borehole lithologic, surface terrain, groundwater monitoring well information, and shallow geophysical (seismic refraction, electrical resistivity, and ground-penetrating radar) data. Used GIS to characterized the alluvial hydrostratigraphy and the bedrock-alluvium interface and to identify two large paleochannels of the Susquehanna River that wer buried beneath the valley fill deposits. Currently using GIS model to construct a three-dimensional MODFLOW model to simulate regional groundwater flow and predict impact of gravel mining on the hydrologic budget of the wetlands.

Fluvial Geomorphology and Channel Change,
Kennebec and Dead River Basins, Maine

Fluvial geomorphologic study of large watershed to predict downstream channel response to changes in flow releases from hydroelectric dam. Developed high-resolution GIS coverages of stream channel, delineated sub-reaches and areas of bank erosion and bed armoring, and developed channel response model to predict geomorphic change.

Karst Hydrology and Ecology of Nippenose Watershed
Nippenose Valley, Pennsylvania

Field study of macroinvertebrate communities in sinkholes and springs in Ordivician limestone aquifers in Nippenose Valley, Pennsylvania. Devloped GIS-coverages of terrain and alluvial fan and debris locations, soil types and alluvial features, bedrock lithology, geologic structural features such as faults and joint, sinkhole location, and limestone solution feature pattern. Performed dye trace tests to delineate groundwater flow directions and velocities.

Modeling Transport of Contaminated Sediments,
White Oak Creek Watershed, Tennessee

Application of finite-element numerical model to predict sediment transport in contaminated watershed in response to 10-, 50-, and 100-year storm events. Compared results with HSPF continuous model.

Environmental Impact of Hydroelectric Development,
Skagit River Basin, Washington (USA)

Investigation of fluvial and hillslope processes controlling channel morphology, pool/riffle location, and sediment transport capacity in remote forested watersheds in Pacific northwest. Developed quantitative index for assessing impact of hydroelectic projects on downstream channels and fisheries habitat. Results incorporated in Environmental Impact Statement (EIS).

Incised-Channel Morphology and Sediment Storage,
Upper Colorado River Basin, Colorado, Utah, and New Mexico

Detailed mapping and sampling of incised channel networks to determine the controls on the storage of sediment and salt in ephemeral streams in the southwestern United States. Mapped channel morphology and collected alluvium samples from 37 incised streams and delineated areas of significant salinity storage in the basin. Evaluated the impact of progressive morphologic changes on sediment removal, flood magnitude, and riparian habitat in arid watersheds.

Environmental Impact of Hydroelectric Development,
Nooksack River Basin, Washington

Investigation of fluvial and hillslope processes controlling channel morphology, pool/riffle location, and sediment transport capacity in remote forested watersheds in Pacific northwest. Developed quantitative index for assessing impact of hydroelectic projects on downstream channels and fisheries habitat. Results incorporated in Environmental Impact Statement (EIS).

Hydrologic Analysis of Paleoflood Deposits,
Front Range, Colorado

Field investigation of massive boulder and gravel deposits in a steep mountain stream in Front Range of Colorado. Applied HEC-2 model to estimate peak discharge and recurrence interval of the extremely large paleoflood.

Fluvial Geomorphology of the Sabie and Letaba Rivers,
Republic of South Africa

Field and laboratory investigation of geologic and hydrologic controls on channel morphology of the Sabie and Letaba Rivers in Kruger National Park, South Africa. Applied unsteady hydraulic model to predict sediment transport and changes in channel morphology under various hydroclimatic conditions.

Influence of Large-Scale Climatic Forcing Elements on Streamflow, Suspended-Sediment and Dissolved-Solids Loads, in the Upper Colorado River Basin, Colorado, Wyoming, Utah, and New Mexico USA
Determined influence of climatic forcing elements and channel changes on streamflow, suspended-sediment and dissolved-solids loads in the Upper Colorado River basin. Determined associations between large-scale atmospheric processes and temporal and spatial variations in streamflow and water quality.

Water Quality Modeling of Douglas Reservoir,
Jefferson County, Tennessee

Developed a two-dimensional hydrodynamic and water quality model of 47-mile reach of multipurpose tributary reservoir. Calibrated model incorporated 12 water quality constituents, including temperature, dissolved oxygen, algae, and nutrient cycling. Developed sophisticated graphical post-processor to analyze advective processes and visualize far-field effects of hydraulic structures. Model used to evaluate the effectiveness of various management scenarios, including surface water pumps, selective withdrawal, and oxygen diffusers.

Water Quality Modeling of Pardee and Camanche Reservoir,
Calaveras County, California

Developed two-dimensional hydrodynamic model to evaluate mixing and water temperatures in two large water-supply reservoirs in northern California. Model simulations performed to predict the impact of various reservoir operation scenarios on downstream fish habitat. Model results incorporated into Environmental Impact Statement.