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Filter Total Items: 734
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Year Published: 2021

Instruments, methods, rationale, and derived data used to quantify and compare the trapping efficiencies of four types of pressure-difference bedload samplers

Bedload and ancillary data were collected to calculate and compare the bedload trapping efficiencies of four types of pressure-difference bedload samplers as part of episodic, sediment-recirculating flume experiments at the St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, in January–March 2006. The bedload-sampler experiments,...

Gray, John R.; Schwarz, Gregory E.; Dean, David J.; Czuba, Jonathan A. ; Groten, Joel T.
Gray, J.R., Schwarz, G.E., Dean, D.J., Czuba, J.A., and Groten, J.T., 2021, Instruments, methods, rationale, and derived data used to quantify and compare the trapping efficiencies of four types of pressure-difference bedload samplers: U.S. Geological Survey Open-File Report 2021–1064, 61 p., https://doi.org/10.3133/ofr20211064.

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Year Published: 2021

Is there an urban pesticide signature? Urban streams in five U.S. regions share common dissolved-phase pesticides but differ in predicted aquatic toxicity

Pesticides occur in urban streams globally, but the relation of occurrence to urbanization can be obscured by regional differences. In studies of five regions of the United States, we investigated the effect of region and urbanization on the occurrence and potential toxicity of dissolved pesticide mixtures. We analyzed 225 pesticide compounds in...

Nowell, Lisa H.; Moran, Patrick W.; Bexfield, Laura M.; Mahler, Barbara; Van Metre, Peter C.; Bradley, Paul; Schmidt, Travis S.; Button, Daniel T.; Qi, Sharon L.

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Year Published: 2021

Beyond streamflow: Call for a national data repository of streamflow presence for streams and rivers in the United States

Observations of the presence or absence of surface water in streams are useful for characterizing streamflow permanence, which includes the frequency, duration, and spatial extent of surface flow in streams and rivers. Such data are particularly valuable for headwater streams, which comprise the vast majority of channel length in stream networks,...

Jaeger, Kristin; Hafen, Konrad; Dunham, Jason B.; Fritz, Ken M.; Kampf, Stephanie K.; Barnhart, Theodore B.; Kaiser, Kendra E.; Sando, Roy; Johnson, Sherri L; McShane, Ryan R.; Dunn, Sarah Beth

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Year Published: 2021

Nitrogen and phosphorus loads from groundwater to Lake Spokane, Spokane, Washington, October 2016–October 2019

Shallow nearshore groundwater and estimates of groundwater seepage were collected at 21 locations along the north and south shores of Lake Spokane beginning in October 2016 and ending in October 2019. Nitrate plus nitrite concentrations in nearshore groundwater ranged from <0.04 to 7.60 milligrams of nitrogen per liter. Nearshore groundwater...

Sheibley, Richard W.; Foreman, James R.
Sheibley, R.W., and Foreman, J.R., 2021, Nitrogen and phosphorus loads from groundwater to Lake Spokane, Spokane, Washington, October 2016–October 2019: U.S. Geological Survey Scientific Investigations Report 2021–5023, 34 p., https://doi.org/10.3133/sir20215023.

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Year Published: 2021

Inclusion of pesticide transformation products is key to estimating pesticide exposures and effects in small U.S. streams

Improved analytical methods can quantify hundreds of pesticide transformation products (TPs), but understanding of TP occurrence and potential toxicity in aquatic ecosystems remains limited. We quantified 108 parent pesticides and 116 TPs in more than 3 700 samples from 442 small streams in mostly urban basins across five major regions of the...

Mahler, Barbara; Nowell, Lisa H.; Sandstrom, Mark W.; Bradley, Paul; Romanok, Kristin; Konrad, Christopher; Van Metre, Peter

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Year Published: 2021

Exploring biophysical linkages between coastal forestry management practices and aquatic bivalve contaminant exposure

Terrestrial land use activities present cross-ecosystem threats to riverine and marine species and processes. Specifically, pesticide runoff can disrupt hormonal, reproductive, and developmental processes in aquatic organisms, yet non-point source pollution is difficult to trace and quantify. In Oregon, U.S.A., state and federal forestry pesticide...

Scully-Engelmeyer, Kaegan; Granek, Elise F.; Nielsen-Pincus, Max; Lanier, Andy; Rumrill, Steven S; Moran, Patrick W.; Nilsen, Elena; Hladik, Michelle; Pillsbury, Lori

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Year Published: 2021

Identifying geomorphic process domains in the synthetic landscapes of West Virginia, USA

Human activities such as mining, agriculture, and urbanization have resulted in severe, large‐scale alteration to landform organization and associated geomorphic processes. The mountaintop mining (MTM) region of West Virginia, USA has experienced dramatic topographic alteration, by removing steep slopes and introducing plateau‐like areas at...

Jaeger, Kristin; Ross, Matthew V

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Year Published: 2021

Microplastics in the Delaware River, northeastern United States

Microplastics are a contaminant of increasing concern in aquatic environments. Our understanding of microplastics in freshwater environments has increased dramatically over the past decade, but we still lack information on microplastic occurrence and biological uptake in National Park Service (NPS) waters. During 2015–19, the U.S. Geological...

Baldwin, Austin K.; Spanjer, Andrew R.; Hayhurst, Brett; Hamilton, Donald
Baldwin, A.K., Spanjer, A.R., Hayhurst, B., and Hamilton, D., 2021, Microplastics in the Delaware River, northeastern United States: U.S. Geological Survey Fact Sheet 2020-3071, 4 p., https://doi.org/10.3133/fs20203071.

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Year Published: 2021

Contrasting mobilization of elements in contact with sediment from Lake Roosevelt and the Upper Columbia River, Washington, USA

Trace element contamination is known to be widely present in sediment of Lake Roosevelt and the riverine reach of the Columbia River in Washington State, USA due to discharges from several smelters and numerous mines dating back to the mid-1800's. In this study, the concentrations of aqueous elements in contact with bed sediment from the lake and...

Paulson, Anthony; Cox, Stephen E.

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Year Published: 2020

Variable-density groundwater flow and contaminant transport, Operable Unit 1, Naval Base Kitsap, Keyport, Washington

Chlorinated volatile organic compounds (CVOCs) have migrated to groundwater beneath a former 9-acre landfill at Operable Unit 1 (OU-1) on Naval Base Kitsap, which was active from the 1930s through 1973 on the Keyport Peninsula, in Kitsap County, Washington. Biodegradation of CVOCs at OU-1 limits the mass of dissolved-phase CVOCs in groundwater...

Yager, Richard M.; Welch, Wendy B.; Headman, Alexander; Dinicola, Richard S.
Yager, R.M., Welch, W.B., Headman, A., and Dinicola, R.S., 2020, Variable-density groundwater flow and contaminant transport, Operable Unit 1, Naval Base Kitsap, Keyport, Washington: U.S. Geological Survey Scientific Investigations Report 2020–5066, 58 p., https://doi.org/10.3133/sir20205066.

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Year Published: 2020

Understanding the relationship between stream metabolism and biological assemblages

Biological assemblages are commonly used for assessing stream health, but there is increased interest among the freshwater research community in incorporating measures of stream function, such as metabolism, to strengthen stream-health assessments. Presently, there is limited information about the relationships between stream metabolism and...

Munn, Mark D.; Sheibley, Rich W.; Waite, Ian R.; Meador, Michael

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Year Published: 2020

Accounting for temporal variability of streamflow in estimates of travel time

Retention, processing, and transport of solutes and particulates in stream corridors are influenced by the travel time of streamflow through stream channels, which varies dynamically with discharge. The effects of streamflow variability across sites and over time cannot be addressed by time-averaged models if parameters are based solely on the...

Konrad, Christopher P.; Schmadel, Noah; Harvey, Judson; Schwarz, Gregory E.; Gomez-Velez, Jesus; Boyer, Elizabeth W.; Scott, Durelle