Publications
Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS. Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.
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Numerical model of the groundwater-flow system near the southeastern part of Puget Sound, Washington
Groundwater flow in the active model area (AMA) was simulated using a groundwater-flow model. A steady-state model version of the model simulates equilibrium conditions, and a transient model version simulates monthly variability. The model corresponds to the physical and temporal dimensions of the conceptual model and groundwater budget. The steady-state model version represents average condition
Authors
Andrew J. Long, Elise E. Wright, Leland T. Fuhrig, Valerie A.L. Bright
Conceptual hydrogeologic framework and groundwater budget near the southeastern part of Puget Sound, Washington
More than 1 million people live within the active model area (AMA) in the southeastern part of the lowlands surrounding Puget Sound, or Puget Lowland, Washington, and groundwater is the source for approximately one-half of their public, domestic, and irrigation water demands. The 887-square-mile AMA, located in King and Pierce Counties, represents the area of analysis for the conceptual hydrogeolo
Authors
Wendy B. Welch, Valerie A.L. Bright, Andrew S. Gendaszek, Sarah B. Dunn, Alexander O. Headman, Elisabeth T. Fasser
Invasive blue catfish in the Chesapeake Bay: A risk to realizing Bay restoration investments
Introduction The partners of the Chesapeake Bay are investing billions of dollars in the restoration of critical habitats to improve conditions for people and living resources throughout the Bay and its watershed. However, the recent proliferation of invasive Ictalurus furcatus (blue catfish) in the Chesapeake Bay’s major rivers has the potential to disrupt these restoration efforts and limit the
Authors
Ellen Robertson, Jenn Malpass, Christopher Ottinger, John Griffin, Christine Densmore, Kenneth Hyer
Characterization of groundwater resources near the southeastern part of Puget Sound, Washington
More than 1 million people live within the active model area (AMA) in the southeastern part of the lowlands surrounding Puget Sound, or Puget Lowland, Washington, and groundwater is the source for approximately one-half of their public, domestic, and irrigation water demands. The 887-square-mile AMA, located in King and Pierce Counties, represents the area of analysis for the conceptual hydrogeolo
DNA-based studies and genetic diversity indicator assessments are complementary approaches to conserving evolutionary potential
Genetic diversity is essential for maintaining healthy populations and ecosystems. Several approaches have recently been developed to evaluate population genetic trends without necessarily collecting new genetic data. Such “genetic diversity indicators” enable rapid, large-scale evaluation across dozens to thousands of species. Empirical genetic studies, when available, provide detailed informatio
Authors
Sean M. Hoban, Ivan Paz-Vinas, Robyn E. Shaw, Luis Castillo-Reina, Jessica M. da Silva, J. Andrew DeWoody, Robert Ekblom, Ancuta Fedorca, Brenna R. Forester, W. Chris Funk, Julia C. Geue, Myriam Heuertz, Peter M. Hollingsworth, Alice C. Hughes, Margaret Hunter, Christina Hvilsom, Fumiko Ishihama, Rebecca Jordan, Belma Kalamujić Stroil, Francine Kershaw, Colin K. Khoury, Viktoria Köppä, Linda Laikre, Anna J. MacDonald, Alicia Mastretta-Yanes, Mariah H. Meek, Joachim Mergeay, Katie L. Millette, David O'Brien, Victor J. Rincón-Parra, M. Alejandra Rodriguez-Morales, Meredith C. Schuman, Gernot Segelbacher, Paul Sunnucks, Rebecca S. Taylor, Henrik Thurfjell, Cristiano Vernesi, Catherine E. Grueber
Despite regional variation, Gymnorhinus cyanocephalus (Pinyon Jay) densities generally increase with local pinyon–juniper cover and heterogeneous ground cover
Traditionally, local-scale habitat-relationship models are developed over small spatial extents, limiting model transferability and inference outside the study area. Thus, habitat managers frequently lack fine-scale information regarding the influence of vegetation composition and structure on site suitability or species abundance. Gymnorhinus cyanocephalus (Pinyon Jay) represents one declining sp
Authors
Nicholas J. Van Lanen, Adrian P. Monroe, Cameron L. Aldridge
On the uncertain intensity estimate of the 1859 Carrington storm
A study is made of the intensity of the Carrington magnetic storm of September 1859 as inferred from visual measurements of horizontal-component geomagnetic disturbance made at the Colaba observatory in India. Using data from modern observatories, a lognormal statistical model of storm intensity is developed, to characterize the maximum-negative value of the storm-time disturbance index (maximum –
Authors
Jeffrey J. Love, E. Joshua Rigler, H. Hayakawa, Kalevi Mursula
Airborne lidar accuracy analysis for dual photogrammetric and lidar sensor pilot project in Colorado, 2019
This report presents accuracy assessment results of the light detection and ranging (lidar) data collected in Colorado during a pilot project in fall 2019. The purpose of the pilot project was to assess the accuracy of lidar and imagery data collected simultaneously for the U.S. Department of Agriculture (USDA) National Agriculture Imagery Program and the U.S. Geological Survey National Geospatial
Authors
Aparajithan Sampath, Jeff Irwin, Minsu Kim
Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2022 annual report
Executive SummarySurveys for the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) were done at Marine Corps Base Camp Pendleton (MCBCP or “Base”), California, between May 9 and July 20, 2022. All of MCBCP’s historically occupied riparian habitat (core survey area) was surveyed for flycatchers in 2022. None of the non-core survey area was surveyed in 2022.Eight transient Willo
Authors
Scarlett L. Howell, Barbara E. Kus
Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2021 annual report
Executive SummaryThe purpose of this report is to provide the Marine Corps with an annual summary of abundance, breeding activity, demography, and habitat use of the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) at Marine Corps Base Camp Pendleton (MCBCP). Surveys for the flycatcher were completed at MCBCP between May 5 and July 31, 2021. All of MCBCP’s historically occupi
Authors
Scarlett L. Howell, Barbara E. Kus
Hydrogeologic framework and extent of saltwater intrusion in Kings, Queens, and Nassau Counties, Long Island, New York
In 2016, the U.S. Geological Survey began a multiyear cooperative study with the New York State Department of Environmental Conservation to evaluate the sustainability of Long Island’s sole-source aquifer system through hydrogeologic mapping, compilation of groundwater chloride concentrations, and groundwater flow modeling. In the initial phase of the islandwide study, the hydrogeologic framework
Authors
Frederick Stumm, Jason S. Finkelstein, John H. Williams, Andrew D. Lange
Simulation of groundwater flow in the Long Island, New York regional aquifer system for pumping and recharge conditions from 1900 to 2019
The U.S. Geological Survey has developed a transient, groundwater-flow model that simulates hydrologic conditions in the Long Island aquifer system as part of an ongoing (since 2016) multiyear, cooperative investigation with the New York State Department of Environmental Conservation. The goals of this investigation are to assist stakeholders and resource managers to evaluate the response of the h
Authors
Donald A. Walter, Kalle L. Jahn, John P. Masterson, Sarken E. Dressler, Jason S. Finkelstein, Jack Monti, Jr.