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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 82,000 reports authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 85087
Methodology to estimate South Arm dissolved salt mass and volume-weighted salinity values Methodology to estimate South Arm dissolved salt mass and volume-weighted salinity values
No abstract available.
Authors
Christine Rumsey, Scott Hynek
Effects of 6PPD, 6PPD-quinone, and potential alternatives on freshwater mussels. Effects of 6PPD, 6PPD-quinone, and potential alternatives on freshwater mussels.
N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD) is an antioxidant and antiozonant widely used in tires. When 6PPD reacts with ozone, it transforms into a breakdown product called 6PPD-quinone (6PPDQ). Both compounds are currently being studied because of their high aquatic toxicity to fish, particularly coho salmon (Oncorhynchus kisutch). The Washington State Legislature...
Authors
Stephanie Gill, David J. Soucek
Tropical and subtropical coral reefs Tropical and subtropical coral reefs
Global declines in coral cover persist, owing to increasing ocean temperatures associated with climate change, continued coastal development, pollution, sedimentation, diseases and the destruction and overextraction of marine resources (through fishing and coral harvesting). These stressors have an impact on coral biodiversity, reef-associated fauna and the architectural complexity of...
Authors
Michael J. Sweet, Maria Beger, Francesca Benzoni, Emma F Camp, Javier del Campo, Kerri L. Dobson, Nohora Galvis, Mehdi Ghodrati Shojaei, Gillian Goby, Simon Harding, Danwei Huang, Viatchelav Ivanenko, William F. Precht, Zoe Richards, Buki Rinkevich, Marie-Lise Schläppy, Curt D. Storlazzi, Parviz Tavakoli-Kolour, Karenne Tun, Sancia E.T. van der Meij, Jenny Carolina Rodriguez-Villalobos, Christian R Voolstra, Brian K Walker
Coastal development Coastal development
As a focal point of global urbanization, the coastal zone faces multiple pressures from human activities, land-sea interactions and natural disasters. Over the past five years, population, communities and infrastructure in coastal zones have consistently grown, alongside gradual economic recovery. Coastal pollution has become more complex owing to climate change and the coronavirus...
Authors
Dahai Liu, Kwasi Appeaning Addo, Jahson Berhane Alemu, Louis Celliers, Piyali Chowdhury, Anya Dunham, Matthew Eliot, Alex Faerman, Yuting Hou, Olanlo Kadjogbe Abra, Jenna Lamphere, Mina Ogbanga, Aline Sbizera Martinez, Vanessa Stelzenmüller, Curt D. Storlazzi, Pascal Thoya, Karenne Tun, Ant Türkmen, Ourania Tzoraki, Wenxiu Xing
Evaluating hydrologic data products for scientific and management applications related to potential future streamflow conditions in the Upper Mississippi and Illinois Rivers Evaluating hydrologic data products for scientific and management applications related to potential future streamflow conditions in the Upper Mississippi and Illinois Rivers
The hydrology of the Upper Mississippi and Illinois Rivers is a fundamental driver of ecosystem patterns and processes across a large portion of the United States. Quantitative hydrologic data for the main stems of these rivers underlie numerous scientific investigations, statistical models, and decision-making processes for local, State, and Federal agencies involved in the Upper...
Authors
Molly Van Appledorn, Lucie Sawyer, John T. Delaney, Chanel Mueller, Leigh Youngblood, Jane Harrell, Brian Breaker, Chris Frans
Using visualization science to inform the design of environmental decision-support tools—A case study of the U.S. Geological Survey Waterwatch Using visualization science to inform the design of environmental decision-support tools—A case study of the U.S. Geological Survey Waterwatch
Environmental decision-support tools are increasingly being used to serve both expert and non-expert audiences. Many existing tools are primarily expert-focused, and redesigning them can be challenging because experts and non-experts interact with tools differently, existing users may be resistant to changes, and there is little guidance on how to prioritize redesign efforts and...
Authors
Michael D. Gerst, Melissa A. Kenney, Emily Read
Assessment of treated wastewater infiltration in Bright Angel Wash and the potential for contaminants of emerging concern influencing spring water quality along the South Rim of the Grand Canyon in Grand Canyon National Park, Arizona Assessment of treated wastewater infiltration in Bright Angel Wash and the potential for contaminants of emerging concern influencing spring water quality along the South Rim of the Grand Canyon in Grand Canyon National Park, Arizona
In April 2021, a synoptic study conducted by the U.S. Geological Survey (USGS) and National Park Service (NPS) identified wastewater-related contaminants of emerging concern (CECs) in springs along the South Rim of the Grand Canyon. These springs are located north of Bright Angel Wash, an ephemeral channel that receives treated effluent from the South Rim Wastewater Treatment Plant...
Authors
Nicholas V. Paretti, Kimberly R. Beisner, Sarah J.R. Shepherd
Gulf Coast Basin CORE-CM initiative final report Gulf Coast Basin CORE-CM initiative final report
The Bureau of Economic Geology at the University of Texas at Austin (UT-BEG) is leading the Gulf Coast Carbon Ore, Rare Earth, and Critical Minerals (CORE-CM) Initiative to assess the potential to produce critical minerals (CMs), including rare earth elements (REEs) from coal, coal ash, and produced water related to oil and gas production, and related materials (alumina processing waste...
Authors
Bridget R. Scanlon, Brent A. Elliott, J. Richard Kyle, Robert C. Reedy, Shelby R. Short, Nolan Theaker, Peter D. Warwick, Victoria G. Stengel, James C. Hower, Davin A. Bagdonas, Dennis R. James, Sandy M. Ebersole, Elizabeth M. Bollen, Dane VanDervoort
Hydrogeologic characterization of the Cahuilla Valley and Terwilliger Valley Groundwater Basins, Riverside County, California Hydrogeologic characterization of the Cahuilla Valley and Terwilliger Valley Groundwater Basins, Riverside County, California
The relation between the groundwater and the amount of natural recharge to the Cahuilla Valley and Terwilliger Valley groundwater basins is not well understood. During the 20th century, the reliance on groundwater near Anza, California, used for agricultural, domestic, and municipal reasons has increased, and there is the potential for changes in groundwater availability related to...
Authors
Christina L. Stamos, Allen H. Christensen, Geoffrey Cromwell, Meghan C. Dick, Christopher P. Ely, Elizabeth R. Jachens, Sarah E. Ogle, Mackenzie M. Shepherd
A probabilistic assessment methodology for the evaluation of geologic energy storage capacity—Natural gas storage in depleted hydrocarbon reservoirs A probabilistic assessment methodology for the evaluation of geologic energy storage capacity—Natural gas storage in depleted hydrocarbon reservoirs
The need for energy storage, particularly underground, where capacity and duration may far exceed battery storage technologies, is especially relevant given the increasing demands for reliable power alongside the development of intermittent renewable electricity sources. Geologic energy storage facilities already exist, and expanded use would enable storing gases such as methane and...
Authors
Marc L. Buursink, Ashton M. Wiens, Matthew M. Jones, Brian A. Varela, Philip A. Freeman, Sean T. Brennan, Matthew D. Merrill, Peter D. Warwick
Shallow geologic framework of the Mississippi Sound and the potential for sediment resources Shallow geologic framework of the Mississippi Sound and the potential for sediment resources
The Mississippi Sound, an estuarine environment located between the mainland and barrier islands bordering the northern Gulf of America (formerly the Gulf of Mexico), serves as a vital ecosystem for the States of Mississippi and Alabama. Spanning approximately 100 kilometers from east to west and covering 1,400 square kilometers, the sound is home to marine industry and ports, and its...
Authors
James Flocks, Arnell Forde
Environmental characterization of Blue Mesa Reservoir and potential causes of and management strategies for harmful algal blooms, 1970 through 2023, Curecanti National Recreation Area, Colorado Environmental characterization of Blue Mesa Reservoir and potential causes of and management strategies for harmful algal blooms, 1970 through 2023, Curecanti National Recreation Area, Colorado
Blue Mesa Reservoir, in the Curecanti National Recreation Area, is the largest storage reservoir in Colorado and consists of three distinct basins: Iola (the shallowest), Cebolla, and Sapinero. After algal toxins were first documented in Iola basin in 2018, the U.S. Geological Survey began a study in cooperation with the National Park Service, Colorado River Water Conservation District...
Authors
Katherine Walton-Day, Natalie K. Day, M. Alisa Mast, Rachel G. Gidley, Evan J. Gohring, Tyler V. King, Warren C. Day, Nicole D. Gibney, Nancy J. Bauch