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Filter Total Items: 944
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Year Published: 2015

Evaluating the relationship between biomass, percent groundcover and remote sensing indices across six winter cover crop fields in Maryland, United States

Winter cover crops are an essential part of managing nutrient and sediment losses from agricultural lands. Cover crops lessen sedimentation by reducing erosion, and the accumulation of nitrogen in aboveground biomass results in reduced nutrient runoff. Winter cover crops are planted in the fall and are usually terminated in early spring, making...

Prabhakara, Kusuma; Hively, W. Dean; McCarty, Greg W.
Prabhakara, Kusuma, Hively, W. Dean, McCarty, Gregory W., 2015, Evaluating the relationship between biomass, percent groundcover and remote sensing indices across six winter cover crop fields in Maryland, United States: International Journal of Applied Earth Observation and Geoinformation, v. 39, p. 88-102, doi:10.1016/j.jag.2015.03.002.

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Year Published: 2015

Hydraulic fracturing water use variability in the United States and potential environmental implications

Until now, up-to-date, comprehensive, spatial, national-scale data on hydraulic fracturing water volumes have been lacking. Water volumes used (injected) to hydraulically fracture over 263,859 oil and gas wells drilled between 2000 and 2014 were compiled and used to create the first U.S. map of hydraulic fracturing water use. Although median...

Gallegos, Tanya J.; Varela, Brian A.; Haines, Seth S.; Engle, Mark A.
Gallegos, T. J., B. A. Varela, S. S. Haines, and M. A. Engle (2015), Hydraulic fracturing water use variability in the United States and potential environmental implications, Water Resour. Res., 51, doi:10.1002/2015WR017278

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Year Published: 2015

Methods used to parameterize the spatially-explicit components of a state-and-transition simulation model

Spatially-explicit state-and-transition simulation models of land use and land cover (LULC) increase our ability to assess regional landscape characteristics and associated carbon dynamics across multiple scenarios. By characterizing appropriate spatial attributes such as forest age and land-use distribution, a state-and-transition model can more...

Sleeter, Rachel; Acevedo, William; Soulard, Christopher E.; Sleeter, Benjamin M.
Rachel R. Sleeter, William Acevedo, Christopher E. Soulard and Benjamin M. Sleeter (2015) Methods used to parameterize the spatially-explicit components of a state-and-transition simulation model. AIMS Environmental Science 2(3): 668-696.

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Year Published: 2015

The distribution of selected elements and minerals in soil of the conterminous United States

In 2007, the U.S. Geological Survey initiated a low-density (1 site per 1600 km2, 4857 sites) geochemical and mineralogical survey of soil of the conterminous United States as part of the North American Soil Geochemical Landscapes Project. Three soil samples were collected, if possible, from each site; (1) a sample from a depth of 0 to 5...

Woodruff, Laurel G.; Cannon, William F.; Smith, David B.; Solano, Federico
Woodruff, L., Cannon, W. F., Smith, D. B., & Solano, F. (2015). The distribution of selected elements and minerals in soil of the conterminous United States. Journal of Geochemical Exploration, 154, 49–60.

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Year Published: 2015

Remote sensing change detection methods to track deforestation and growth in threatened rainforests in Madre de Dios, Peru

Two forestry-change detection methods are described, compared, and contrasted for estimating deforestation and growth in threatened forests in southern Peru from 2000 to 2010. The methods used in this study rely on freely available data, including atmospherically corrected Landsat 5 Thematic Mapper and Moderate Resolution Imaging Spectroradiometer...

Shermeyer, Jacob S.; Haack, Barry N.
Shermeyer, J., Haack, B., 2015, Remote sensing change detection methods to track deforestation and growth in threatened rainforests in Madre de Dios, Peru: Journal of Applied Remote Sensing, v. 9, p. 096040-1 - 096040-15, accessed June 22, 2015, doi:10.1117/1.JRS.9.096040.

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Year Published: 2015

Porphyry copper assessment of northeast Asia: Far East Russia and northeasternmost China: Chapter W in Global mineral resource assessment

The U.S. Geological Survey assesses resources (mineral, energy, water, environmental, and biologic) at regional, national, and global scales to provide science in support of land management and decision making. Mineral resource assessments provide a synthesis of available information about where mineral deposits are known and suspected to be in...

Mihalasky, Mark J.; Ludington, Stephen; Alexeiev, Dmitriy V.; Frost, Thomas P.; Light, Thomas D.; Briggs, Deborah A.; Hammarstrom, Jane M.; Wallis, John C.; Bookstrom, Arthur A.; Panteleyev, Andre
Mihalasky, M.J., Ludington, Steve, Alexeiev, D.V., Frost, T.P., Light, T.D., Briggs, D.A., Hammarstrom, J.M., and Wallis, J.C., with contributions from Bookstrom, A.A., and Panteleyev, Andre, 2015, Porphyry copper assessment of northeast Asia—Far East Russia and Northeasternmost China: U.S. Geological Survey Scientific Investigations Report 2010–5090–W, 104 p., and spatial data, http://dx.doi.org/10.3133/sir20105090W.

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Year Published: 2015

Sediment-hosted stratabound copper deposit model: Chapter M in Mineral deposit model for resource assessment

This report contains a descriptive model of sediment-hosted stratabound copper (SSC) deposits that supersedes the model of Cox and others (2003). This model is for use in assessments of mineral resource potential. SSC deposits are the second most important sources of copper in the world behind porphyry copper deposits. Around 20 percent of the...

Hayes, Timothy S.; Cox, Dennis P.; Bliss, James D.; Piatak, Nadine M.; Seal, Robert R.
Hayes, T.S., Cox, D.P., Piatak, N.M., and Seal, R.R., II, 2015, Sediment-hosted stratabound copper deposit model: U.S. Geological Survey Scientific Investigations Report 2010–5070–M, 147 p., http://dx.doi.org/10.3133/sir20105070M.

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Year Published: 2015

Carbon dioxide storage in unconventional reservoirs workshop: summary of recommendations

“Unconventional reservoirs” for carbon dioxide (CO2) storage—that is, geologic reservoirs in which changes to the rock trap CO2 and therefore contribute to CO2 storage—including coal, shale, basalt, and ultramafic rocks, were the focus of a U.S. Geological Survey (USGS) workshop held March 28 and 29, 2012, at the...

Jones, Kevin B.; Blondes, Madalyn S.

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Year Published: 2015

Landscape disturbance from unconventional and conventional oil and gas development in the Marcellus Shale region of Pennsylvania, USA

The spatial footprint of unconventional (hydraulic fracturing) and conventional oil and gas development in the Marcellus Shale region of the State of Pennsylvania was digitized from high-resolution, ortho-rectified, digital aerial photography, from 2004 to 2010. We used these data to measure the spatial extent of oil and gas development and to...

Slonecker, Terry E.; Milheim, Lesley E.
Slonecker, E.T. and Milheim, L.E. 2015, Landscape Disturbance from Unconventional and Conventional Oil and Gas Development in the Marcellus Shale Region of Pennsylvania, USA, Environments 2(2), 200-220; doi:10.3390/environments2020200. Available online: http://www.mdpi.com/2076-3298/2/2/200

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Year Published: 2015

Applied Geochemistry Special Issue on Environmental geochemistry of modern mining

Environmental geochemistry is an integral part of the mine-life cycle, particularly for modern mining. The critical importance of environmental geochemistry begins with pre-mining baseline characterization and the assessment of environmental risks related to mining, continues through active mining especially in water and waste management practices...

Seal, Robert R.; Nordstrom, D. Kirk
Seal, R. R., II, & Kirk Nordstrom, D. (2015). Applied Geochemistry Special Issue on Environmental geochemistry of modern mining. Applied Geochemistry, 57, 1–2.

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Year Published: 2015

Fundamentals of carbon dioxide-enhanced oil recovery (CO2-EOR): a supporting document of the assessment methodology for hydrocarbon recovery using CO2-EOR associated with carbon sequestration

The objective of this report is to provide basic technical information regarding the CO2-EOR process, which is at the core of the assessment methodology, to estimate the technically recoverable oil within the fields of the identified sedimentary basins of the United States. Emphasis is on CO2-EOR because this is currently one technology being...

Verma, Mahendra K.
Verma, M.K., 2015, Fundamentals of carbon dioxide-enhanced oil recovery (CO2–EOR)—A supporting document of the assessment methodology for hydrocarbon recovery using CO2–EOR associated with carbon sequestration: U.S. Geological Survey Open-File Report 2015–1071, 19 p., http://dx.doi.org/10.3133/ofr20151071.

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Year Published: 2015

Depositional conditions for the Kuna Formation, Red Dog Zn-PB-Ag-Barite District, Alaska, inferred from isotopic and chemical proxies

Water column redox conditions, degree of restriction of the depositional basin, and other paleoenvironmental parameters have been determined for the Mississippian Kuna Formation of northwestern Alaska from stratigraphic profiles of Mo, Fe/Al, and S isotopes in pyrite, C isotopes in organic matter, and N isotopes in bulk rock. This unit is...

Johnson, Craig A.; Dumoulin, Julie A.; Burruss, Robert A.; Slack, John F.
Johnson, C.A., Dumoulin, J.A., Burruss, R.A., and Slack, J.F., 2015, Depositional conditions for the Kuna Formation, Red Dog Zn-Pb-Ag-barite district, Alaska, inferred from isotopic and chemical proxies: Economic Geology, v. 110, p. 1143-1156.