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Filter Total Items: 1,288
Quantitative framework for preferential flow initiation and partitioning
Year Published: 2016

Quantitative framework for preferential flow initiation and partitioning

A model for preferential flow in macropores is based on the short-range spatial distribution of soil matrix infiltrability. It uses elementary areas at two different scales. One is the traditional representative elementary area (REA), which includes a sufficient heterogeneity to typify larger areas, as for measuring field-scale infiltrability. The...

Nimmo, John R.
Nimmo, J.R., 2016, Quantitative framework for preferential flow initiation and partitioning: Vadose Zone Journal, v. 15, no. 2. http://dx.doi.org/10.2136/vzj2015.05.0079
Influence of vertical and lateral heat transfer on permafrost thaw, peatland landscape transition, and groundwater flow
Year Published: 2016

Influence of vertical and lateral heat transfer on permafrost thaw, peatland landscape transition, and groundwater flow

Recent climate change has reduced the spatial extent and thickness of permafrost in many discontinuous permafrost regions. Rapid permafrost thaw is producing distinct landscape changes in the Taiga Plains of the Northwest Territories, Canada. As permafrost bodies underlying forested peat plateaus shrink, the landscape slowly transitions into...

Kurylyk, Barret; Masaki, Masaki; Quinton, William L.; McKenzie, Jeffrey M.; Voss, Clifford I.
Groundwater
Year Published: 2016

Groundwater

Introduction Groundwater represents the terrestrial subsurface component of the hydrologic cycle. As such, groundwater is generally in motion, moving from elevated areas of recharge to lower areas of discharge. Groundwater usually moves in accordance with Darcy’s law (Dalmont, Paris: Les Fontaines Publiques de la Ville de Dijon, 1856). Groundwater...

Stonestrom, David A.
Stonestrom, D.A., 2016, Groundwater, in Wohl, E., ed., Oxford Bibliographies in Environmental Science: New York, Oxford University Press, p. 1-39. [http:dx.doi.org://10.1093/obo/9780199363445-0053]
Experimental studies and model analysis of noble gas fractionation in porous media
Year Published: 2016

Experimental studies and model analysis of noble gas fractionation in porous media

The noble gases, which are chemically inert under normal terrestrial conditions but vary systematically across a wide range of atomic mass and diffusivity, offer a multicomponent approach to investigating gas dynamics in unsaturated soil horizons, including transfer of gas between saturated zones, unsaturated zones, and the atmosphere. To evaluate...

Ding, Xin; Kennedy, B. Mack.; Evans, William C.; Stonestrom, David A.
Ding, X., Kennedy, B.M., Evans, W.C., and Stonestrom, D.A., 2016, Experimental studies and model analysis of noble gas fractionation in porous media: Vadose Zone J., v. 15, no. 2, p. 1-12. [doi:10.2136/vzj2015.06.0095]
Structured heterogeneity in a marine terrace chronosequence: Upland mottling
Year Published: 2016

Structured heterogeneity in a marine terrace chronosequence: Upland mottling

Soil mottles generally are interpreted as a product of reducing conditions during periods of water saturation. The upland soils of the Santa Cruz, CA, marine terrace chronosequence display an evolving sequence of reticulate mottling from the youngest soil (65 ka) without mottles to the oldest soil (225 ka) with well-developed mottles. The mottles...

Schulz, Marjorie S.; Stonestrom, David A.; Lawrence, Corey; Bullen, Thomas D.; Fitzpatrick, John; Kyker-Snowman, Emily; Manning, Jane; Mnich, Meagan
Schulz, M., Stonestrom, D., Lawrence, C., Bullen, T., Fitzpatrick, J., Kyker-Snowman, E., Manning, J., Mnich, M., 2016, Structured heterogeneity in a marine terrace chronosequence: Upland mottling: Vadose Zone Journal, v.15. http://dx.doi.org/10.2136/vzj2015.07.0102
Bivalve grazing can shape phytoplankton communities
Year Published: 2016

Bivalve grazing can shape phytoplankton communities

The ability of bivalve filter feeders to limit phytoplankton biomass in shallow waters is well-documented, but the role of bivalves in shaping phytoplankton communities is not. The coupled effect of bivalve grazing at the sediment-water interface and sinking of phytoplankton cells to that bottom filtration zone could influence the relative biomass...

Lucas, Lisa; Cloern, James E.; Thompson, Janet K.; Stacey, Mark T.; Koseff, Jeffrey K.
Mercury remediation in wetland sediment using zero-valent iron and granular activated carbon
Year Published: 2016

Mercury remediation in wetland sediment using zero-valent iron and granular activated carbon

Wetlands are hotspots for production of toxic methylmercury (MeHg) that can bioaccumulate in the food web. The objective of this study was to determine whether the application of zero-valent iron (ZVI) or granular activated carbon (GAC) to wetland sediment could reduce MeHg production and bioavailability to benthic organisms. Field mesocosms were...

Lewis, Ariel S.; Huntington, Thomas G.; Marvin-DiPasquale, Mark C.; Amirbahman, Aria
Lewis, A.S., Huntington, T.G., Marvin-DiPasquale, M.C., and Amirbahman, A., 2016, Mercury remediation in wetland sediment using zero-valent iron and granular activated carbon: Environmental Pollution, v. 212, p. 366-373. http://dx.doi.org/10.1016/j.envpol.2015.11.047
Dissolved gases in hydrothermal (phreatic) and geyser eruptions at Yellowstone National Park, USA
Year Published: 2016

Dissolved gases in hydrothermal (phreatic) and geyser eruptions at Yellowstone National Park, USA

Multiphase and multicomponent fluid flow in the shallow continental crust plays a significant role in a variety of processes over a broad range of temperatures and pressures. The presence of dissolved gases in aqueous fluids reduces the liquid stability field toward lower temperatures and enhances the explosivity potential with respect to pure...

Hurwitz, Shaul; Clor, Laura; McCleskey, R. Blaine; Nordstrom, D Kirk; Hunt, Andrew G.; Evans, William C.
Hurwitz, S., Clor, L.E., McCleskey, R.B., Nordstrom, D.K., Hunt, A.G., Evans, W.C., 2016, Dissolved gases in hydrothermal (phreatic) and geyser eruptions at Yellowstone National Park, USA: Geology, 44, 235–238. http://dx.doi.org/10.1130/G37478.1
Dietary uptake of Cu sorbed to hydrous iron oxide is linked to cellular toxicity and feeding inhibition in a benthic grazer
Year Published: 2016

Dietary uptake of Cu sorbed to hydrous iron oxide is linked to cellular toxicity and feeding inhibition in a benthic grazer

Whereas feeding inhibition caused by exposure to contaminants has been extensively documented, the underlying mechanism(s) are less well understood. For this study, the behavior of several key feeding processes, including ingestion rate and assimilation efficiency, that affect the dietary uptake of Cu were evaluated in the benthic grazer Lymnaea...

Cain, Daniel J.; Croteau, Marie-Noele; Fuller, Christopher C.; Ringwood, Amy H.
The Lassen hydrothermal system
Year Published: 2016

The Lassen hydrothermal system

The active Lassen hydrothermal system includes a central vapor-dominated zone or zones beneath the Lassen highlands underlain by ~240 °C high-chloride waters that discharge at lower elevations. It is the best-exposed and largest hydrothermal system in the Cascade Range, discharging 41 ± 10 kg/s of steam (~115 MW) and 23 ± 2 kg/s of high-chloride...

Ingebritsen, Steven E.; Bergfeld, Deborah; Clor, Laura; Evans, William C.
Functional metagenomic selection of RubisCOs from uncultivated bacteria
Year Published: 2016

Functional metagenomic selection of RubisCOs from uncultivated bacteria

Ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO) is a critical yet severely inefficient enzyme that catalyses the fixation of virtually all of the carbon found on Earth. Here, we report a functional metagenomic selection that recovers physiologically active RubisCO molecules directly from uncultivated and largely unknown members of...

Varaljay, Vanessa A; Satagopan, Sriram; North, Justin A.; Witteveen, Briana; Dourado, Manuella N.; Anantharaman, Karthik; Arbing, Mark A.; McCann, Shelley; Oremland, Ronald S.; Banfield, Jillian F.; Wrighton, Kelly C.; Tabita, F. Robert
Bivalve effects on the food web supporting delta smelt—A long-term study of bivalve recruitment, biomass, and grazing rate patterns with varying freshwater outflow
Year Published: 2016

Bivalve effects on the food web supporting delta smelt—A long-term study of bivalve recruitment, biomass, and grazing rate patterns with varying freshwater outflow

Executive Summary Phytoplankton is an important and limiting food source in the Sacramento-San Joaquin Delta (the Delta) and San Francisco Bay; the decline of phytoplankton biomass is one possible factor in the pelagic organism decline and specifically in the decline of the protected delta smelt. The bivalves Corbicula fluminea andPotamocorbula...

Crauder, Jeff S.; Thompson, Janet K.; Parchaso, Francis; Anduaga, Rosa I.; Pearson, Sarah A.; Gehrts, Karen; Fuller, Heather; Wells, Elizabeth
Crauder, J.S., Thompson, J.K., Parchaso, F., Anduaga, R.I., Pearson, S.A., Gehrts, K., Fuller, H., and Wells, E., 2016, Bivalve effects on the food web supporting delta smelt—A long-term study of bivalve recruitment, biomass, and grazing rate patterns with varying freshwater outflow: U.S. Geological Survey Open-File Report 2016–1005, 216 p., http://dx.doi.org/10.3133/ofr20161005.

The USGS produces many types of multimedia products. Use the links below to browse our offerings of photograph galleries, podcasts and sound files, videos, aerial photos, and posters related to water. The USGS Newsroom has a Web page that highlights the main collection of multimedia products.

Filter Total Items: 605
May 2016 (approx.)
On the remote western coast of Australia lies a UNESCO World Heritage Site above and below the sea. Researchers from the U.S. Geological Survey and University of Western Australia convened here at Ningaloo Reef and Jurabi Coastal Reserve to embark on the most extensive study EVER done into how coral reefs shape our coasts.
Satellite image showing flooding in Sri Lanka
May 18, 2016
On May 18, 2016, a Landsat 8 acquisition of flood-ravaged Sri Lanka produced impressive imagery of swollen waterways.
May 10, 2016
During edge-of-field monitoring of an agricultural field runoff event, a depth-integrated sample arm (DISA) is used to take a water sample at the same time a traditional water sample is taken from an intake located at the bottom of the H-flume exit, where the water is assumed to be completely mixed. The DISA is normally used to collect a continuous vertical sample representing the entire water...
May 7, 2016
Dave Krabbenhoft discusses the history of his 28-year career at the USGS. He describes how he started working on mercury research in the 1980s, trying to unravel the mystery of why mercury was being detected in fish in pristine lakes in Northern Wisconsin, and how that research has evolved over time to determine atmospheric mercury is the primary source of mercury pollution in those pristine...
May 7, 2016
Dave Krabbenhoft discusses working on the U.S. EPA's Lake Guardian, and the perspective he and his team have by being on board and viewing the less developed parts of the shoreline from the middle of the lake.
Photo of the Colorado River near Moab, Utah
May 2016 (approx.)
Water flowing on the Colorado River near Moab, Utah. The entire Colorado River Basin currently supports 50 million people, and that amount is expected to increase by 23 million between 2000 and 2030. A new USGS study shows more than half of the streamflow in the Upper Colorado River Basin originates as groundwater.
April 25, 2016
Jeremy Yazzie, information technology specialist with the USGS National Research Program, talks about supporting water research through network security.
April 2016 (approx.)
Employees of the Arizona Water Science Center describe their experiences working for the USGS revealing that it is far more than just a workplace.
Filter Total Items: 279
USGS Online GW Quality Mapper Nat Map
June 2, 2016

A first of its kind, national assessment of an unseen, valuable resource used by millions of people.

Photo of a temporary streamgage installed by the USGS on the Brazos River near West Columbia, Texas.
June 1, 2016

Reporters: Do you want to interview USGS scientists as they measure flooding? Please contact Jennifer LaVista.

Texas Water Dashboard map showing streamflow and weather conditions for May 27, 2016.
May 27, 2016

Reporters: Do you want to interview USGS scientists as they measure flooding? Please contact Jennifer LaVista.

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May 20, 2016

CARSON CITY, Nev. — Are you interested in learning more about the groundwater and surface water systems of Snake Valley in eastern Nevada? Please join scientists from the U.S. Geological Survey and University of Nevada, Reno at one of two public presentations in Baker and Ely.

Tanner Creek outfall
May 17, 2016

A new study found high concentrations of commonly used insecticides in streams running through the highly urbanized portion of Clackamas County.

NWQL.gif
May 16, 2016

Forty years ago, water samples from around the country started flowing into the U.S. Geological Survey’s National Water Quality Laboratory in Colorado.

USGS logo
May 10, 2016

A new study from the USGS assesses water quality data for the Juniata River Basin in Western Blair County, Pennsylvania.

Green USGS Logo
May 4, 2016

Elevated levels of trace metals such as iron, lead, nickel and zinc were found in streams of the San Gabriel Mountains north of Los Angeles, California, at water-quality levels higher than the Environmental Protection Agency’s Aquatic Life Ambient Water Quality Criteria, according to a new U.S. Geological Survey study. 

Mt Rushmore soil sampling
May 2, 2016

Past fireworks displays are the probable cause of elevated concentrations of a contaminant called perchlorate in groundwater and surface water within Mount Rushmore National Memorial, according to a recent U.S. Geological Survey report.