Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16744
Trends in surface-water quality during implementation of best-management practices in Mill Creek and Muddy Run Basins, Lancaster County, Pennsylvania Trends in surface-water quality during implementation of best-management practices in Mill Creek and Muddy Run Basins, Lancaster County, Pennsylvania
Analyses of water samples collected over a 5-year period (1993-98) in the Mill Creek and Muddy Run Basins during implementation of agricultural best-management practices (BMP’s) indicate statistically significant trends in the concentrations of several nutrient species and in nonfilterable residue (suspended solids). The strongest trends identified were those indicated by a more than 50-...
Authors
Edward H. Koerkle
Use of multi-date Landsat TM imagery to map Eastern hemlock (Tsuga canadensis) decline due to hemlock woolly adelgid (Adelges tsugae) in Shenandoah National Park Use of multi-date Landsat TM imagery to map Eastern hemlock (Tsuga canadensis) decline due to hemlock woolly adelgid (Adelges tsugae) in Shenandoah National Park
No abstract available.
Authors
David D. Morton, John A. Young, Nissa M. Thomsen
Controls on soil respiration: implications for climate change Controls on soil respiration: implications for climate change
No abstract available.
Authors
Lindsey E. Rustad, Thomas G. Huntington, Richard D. Boone
Volumetric evolution of Surtsey, Iceland, from topographic maps and scanning airborne laser altimetry Volumetric evolution of Surtsey, Iceland, from topographic maps and scanning airborne laser altimetry
The volumetric evolution of Surtsey has been estimated on the basis of digital elevation models derived from NASA scanning airborne laser altimeter surveys (20 July 1998), as well as digitized 1:5,000-scale topographic maps produced by the National Land Survey of Iceland and by Norrman. Subaerial volumes have been computed from co-registered digital elevation models (DEM's) from 6 July...
Authors
J.B. Garvin, R.S. Williams, J.J. Frawley, W.B. Krabill
Water resources management plan: Cold Harbor and Gaines' Mill units, Richmond National Battlefield Park, Virginia Water resources management plan: Cold Harbor and Gaines' Mill units, Richmond National Battlefield Park, Virginia
No abstract available.
Authors
Karen C. Rice, David Vana-Miller, Mark D. Flora
Hydrologic budget of the late Oligocene Lake Creede and the evolution of the upper Rio Grande drainage system Hydrologic budget of the late Oligocene Lake Creede and the evolution of the upper Rio Grande drainage system
The filling history, hydrologic budget, and geomorphic development of ancient Lake Creede and its tributary basin are evaluated to determine the factors that controlled its character. The lake filled the Creede caldera that formed in the late Oligocene as a consequence of the eruption of the Snowshoe Mountain Tuff. The caldera's sedimentary fill accumlated to a depth of about 1.26 km and...
Authors
Paul B. Barton, Thomas A. Steven, Daniel O. Hayba
Relationship of Eastern hemlock (Tsuga canadensis) to the ecology of small streams in Delaware Water Gap National Recreation Area Relationship of Eastern hemlock (Tsuga canadensis) to the ecology of small streams in Delaware Water Gap National Recreation Area
Hemlock ravines in Delaware Water Gap National Recreation Area (DEWA) are highly valued because of their distinctive aesthetic, recreational and ecological qualities. We conducted a comparative study designed to determine the potential long-term consequences to aquatic communities of the suspected transition from hemlock-dominated forests to mixed hardwood forests as a result of hemlock...
Authors
David P. Lemarie, John A. Young, Craig D. Snyder, Robert M. Ross, David Smith, Randy M. Bennett
Phosphate sorption by base metal hydroxides generated in the neutralization of acid mine drainage Phosphate sorption by base metal hydroxides generated in the neutralization of acid mine drainage
No abstract available at this time
Authors
P.L. Sibrell, P.R. Adler
Heron conservation Heron conservation
Herons are large, popular and, in many cases, spectacular birds found in wetlands world-wide, both tropical and temperate, natural and man-made. Some populations are very small and localized, some have decreased, some have expanded their ranges, and a few are pests of human activities. In the fifteen years since the publication of the latest monographic treatment of the family, The...
Ground-water quality and vulnerability to contamination in selected agricultural areas of southeastern Michigan, northwestern Ohio, and northeastern Indiana Ground-water quality and vulnerability to contamination in selected agricultural areas of southeastern Michigan, northwestern Ohio, and northeastern Indiana
Ground-water quality was assessed in the northeastern part of the Corn Belt, where tile-drained row crops are underlain by fractured glacial till. Data were collected from 30 shallow monitor wells and 18 co-located domestic wells as part of the U.S. Geological Survey’s National Water- Quality Assessment in the Lake Erie-Lake St. Clair Basin. Pesticides or pesticide degradates were...
Authors
Mary Ann Thomas
Strontium Strontium
Mexico is the leading producer of celestite, the most common strontium ore. Chemical Products is the only major US maker of strontium compounds. It produces all of its strontium carbonate from imported Mexican celestite. Mexico is also a large producer of strontium carbonate, as are China, Germany, Japan and the Republic of Korea. There has been no celestite production in the United...
Authors
J.A. Ober
Industrial garnet Industrial garnet
The state of the global industrial garnet industry in 1999 is discussed. Industrial garnet mined in the U.S., which accounts for approximately one-third of the world's total, is usually a solid-solution of almandine and pyrope. The U.S. is the largest consumer of industrial garnet, using an estimated 47,800 st in 1999 as an abrasive and as a filtration medium in the petroleum industry...
Authors
D.W. Olson