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16437 results.

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Page 16, results 376 - 400

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Interactive effects of salinity and hydrology on radial growth of bald cypress (Taxodium distichum (L.) Rich.) in coastal Louisiana, USA
Richard Day, Andrew From, Darren Johnson, Ken Krauss
2024, Forests (15)
Tidal freshwater forests are usually located at or above the level of mean high water. Some Louisiana coastal forests are below mean high water, especially bald cypress (Taxodium distichum (L.) Rich.) forests because flooding has increased due to the combined effects of global sea level rise and local subsidence. In...
Guidelines for the use of automatic samplers in collecting surface-water quality and sediment data
Timothy P. Wilson, Cherie V. Miller, Evan A. Lechner
2024, Techniques and Methods 1-D12
The importance of fluvial systems in the transport of sediment, dissolved and suspended contaminants, nutrients, and bacteria through the environment is well established. The U.S. Environmental Protection Agency (EPA) identifies sediment as the single most widespread water contaminant affecting the beneficial uses of the Nation’s rivers and streams. The evaluation...
Quantifying compound and nonlinear effects of hurricane-induced flooding using a dynamically coupled hydrological-ocean model
Daoyang Bao, Z. George Xue, John C. Warner
2024, Water Resources Research (60)
We recently developed a dynamically coupled hydrological-ocean modeling system that provides seamless coverage across the land-ocean continuum during hurricane-induced compound flooding. This study introduced a local inertial equation and a diagonal flow algorithm to the overland routing of the coupled system’s hydrology model (WRF-Hydro). Using Hurricane Florence (2018) as a...
Groundwater flow model for the Des Moines River alluvial aquifer near Des Moines, Iowa
Emilia L. Bristow, Kyle W. Davis
2024, Scientific Investigations Report 2024-5059
Des Moines Water Works (DMWW) is a regional municipal water utility that provides residential and commercial water resources to about 600,000 customers in Des Moines, Iowa, and surrounding municipalities in central Iowa. DMWW has identified a need for increased water supply and is exploring the potential for expanding groundwater production...
Same streams in a different forest? Investigations of forest harvest legacies and future trajectories across 30 years of stream habitat monitoring on the Tongass National Forest, Alaska
Michael J. Moore, R. Flitcroft, E. Tucker, K. K. Prussian, S. M. Claeson
2024, PLoS ONE (19)
The effects of timber harvest practices and climate change have altered forest ecosystems in southeast Alaska. However, quantification of patterns and trends in stream habitats associated with these forests is limited owing to a paucity of data available in remote watersheds. Here, we analyzed a 30-year dataset from southeast Alaska's...
Assessment of nutrient load estimation approaches for small urban streams in Durham, North Carolina
Stephen L. Harden, Celeste A. Journey, Alexandra B. Etheridge
2024, Scientific Investigations Report 2024-5053
This cooperative study between the City of Durham Public Works Department, Stormwater Division and U.S. Geological Survey evaluated whether alternate monitoring strategies that incorporated samples collected across an increased range of streamflows would improve nutrient load estimates for Ellerbe and Sandy Creeks, two small, highly urbanized streams in the City...
A probabilistic approach to training machine learning models using noisy data
Ayman H. Alzraiee, Richard G. Niswonger
2024, Environmental Modelling & Software (179)
Machine learning (ML) models are increasingly popular in environmental and hydrologic modeling, but they typically contain uncertainties resulting from noisy data (erroneous or outlier data). This paper presents a novel probabilistic approach that combines ML and Markov Chain Monte Carlo simulation to (1) detect and underweight likely noisy data, (2) develop an approach capable of...
Controls on stable methane isotope signatures in northern peatlands and potential shifts in signatures under permafrost thaw scenarios
McKenzie A. Kuhn, Ruth K. Varner, Carmody K. McCalley, Clarice R. Perryman, Mika Aurela, Sophia A. Burke, Jeffrey Chanton, Patrick Crill, Jessica DelGreco, Jia Deng, Liam Heffernan, Christina Herrick, Suzanne B. Hodgkins, Cheristy P. Jones, Sari Juutinen, Evan S. Kane, Louis J. Lamit, Tuula Larmola, Erik Lilleskov, David Olefeldt, Michael W. Palace, Virginia I. Rich, Christopher Schulze, Joanne H. Shorter, Franklin Sullivan, Oliver Sonnentag, Merritt R. Turetsky, Mark Waldrop
2024, Journal of Geophysical Research: Biogeosciences (129)
Northern peatlands are a globally significant source of methane (CH4), and emissions are projected to increase due to warming and permafrost loss. Understanding the microbial mechanisms behind patterns in CH4 production in these systems will be key to predicting annual emissions changes, with stable carbon isotopes (δ13C-CH4) being a powerful...
Isotopic evaluation of the National Water Model reveals missing agricultural irrigation contributions to streamflow across the western United States
Annie L. Putman, Patrick C. Longley, Morgan C. McDonnell, James E. Reddy, Michelle P. Katoski, Olivia L. Miller, J. Renee Brooks
2024, Hydrology and Earth Systems Science (28) 2895-2918
The National Water Model (NWM) provides critical analyses and projections of streamflow that support water management decisions. However, the NWM performs poorly in lower-elevation rivers of the western United States (US). The accuracy of the NWM depends on the fidelity of the model inputs and the representation and calibration of...
Synoptic analysis and WRF-Chem model simulation of dust events in the southwestern United States
Saroj Dhital, Nicholas P. Webb, Adrian Chappell, Michael L. Kaplan, Travis W. Nauman, Gayle Loren Tyree, Michael C. Duniway, Brandon L. Edwards, Sandra L. LeGrand, Theodore W. Letcher, S. McKenzie Skiles, Patrick Naple, Nathaniel W. Chaney, Jiaxuan Cai
2024, JGR Atmospheres (129)
Dust transported from rangelands of the Southwestern United States (US) to mountain snowpack in the Upper Colorado River Basin during spring (March-May) forces earlier and faster snowmelt, which creates problems for water resources and agriculture. To better understand the drivers of dust events, we investigated large-scale meteorology responsible for organizing...
Impacts of convective storms on runoff, erosion, and carbon export in a continuous permafrost landscape
Marisa Repasch, Josie Arcuri, Irina Overeem, Suzanne P. Anderson, Robert G. Anderson, Joshua C. Koch
2024, Conference Paper
Permafrost holds more than twice the amount of carbon currently in the atmosphere, but this large carbon reservoir is vulnerable to thaw and erosion under a rapidly changing Arctic climate. Convective storms are becoming increasingly common during Arctic summers and can amplify runoff and erosion. These extreme events, in concert...
Application of a workflow to determine the feasibility of using simulated streamflow for estimation of streamflow frequency statistics
Amanda Whaling, Kelly Sanks, William H. Asquith, Kirk D. Rodgers
2024, Journal of Hydrologic Engineering (29)
Streamflow records from hydrologic models are attractive for use in operational hydrology, such as a streamflow frequency analysis. The amount of bias inherent to simulated streamflow from hydrologic models is often unknown, but it is likely present in derivative products. Therefore, a workflow may help determine where streamflow frequency analysis...
Use of Doppler velocity radars to monitor and predict debris and flood wave velocities and travel times in post-wildfire basins
John W, Fulton, Nicholas Graff Hall, Laura A. Hempel, J.J. Gourley, Mark F. Henneberg, Michael S. Kohn, William H. Farmer, William H. Asquith, Daniel Wasielewski, Andrew S. Stecklein, Amanullah Mommandi, Aziz Khan
2024, Journal of Hydrology X (24)
The magnitude and timing of extreme events such as debris and floodflows (collectively referred to as floodflows) in post-wildfire basins are difficult to measure and are even more difficult to predict. To address this challenge, a sensor ensemble consisting of noncontact, ground-based (near-field), Doppler velocity (velocity) and pulsed (stage...
Two-dimensional hydraulic model for the Chain of Lakes on the Fox River near McHenry, Illinois
Charles V. Cigrand, Michael R. Ament
2024, Scientific Investigations Report 2024-5056
Forecasts of flows entering and leaving the Chain of Lakes on the Fox River in northeastern Illinois are critical information to water-resource managers operating the Stratton Dam at McHenry, Illinois. These managers determine the optimal operation of the Stratton Dam at McHenry, Ill., to manage Chain of Lakes pool levels...
Unified 200 kyr paleohydrologic history of the Southern Great Basin: Death Valley, Searles Valley, Owens Valley and the Devils Hole cave
Tim Lowenstein, Kristian Olson, Brian W. Stewart, David McGee, Justin Stroup, Adam M. Hudson, Kathleen Wendt, Mark Peaple, Sarah Feakins, Ronald Spencer, Tripti Bhattacharya, Steven P. Lundblad, Ronald Litwin
2024, Quaternary Science Reviews (336)
We present a hydroclimate synthesis of the southern Great Basin over the last two glacial-interglacial cycles focused on paleolakes in Death Valley (core DV93-1), Searles Valley (core SLAPP-SRLS17), Owens Valley (core OL92), and the Devils Hole cave. There is...
Thermo-hydrologic processes governing supra-permafrost talik dynamics in discontinuous permafrost near Umiujaq (Québec, Canada)
Philippe Fortier, Nathan Young, Michelle A. Walvoord, Jean-Michel Lemieux, Aaron Mohammed
2024, Conference Paper, Proceedings of the 12th International Conference on Permafrost
Widespread supra-permafrost talik formation is currently recognized as a critical mechanism that could accelerate permafrost thaw in the Arctic (e.g., Connon et al. 2018; Farquharson et al. 2022). However, the trajectory of permafrost dynamics following talik formation may prove difficult to predict. Physically-based cryohydrogeologic models provide a powerful tool for understanding processes and factors controlling talik dynamics and,...
Thermal and hydrological limitations on modeling carbon dynamics at wetland sites of discontinuous and continuous permafrost extent
Benjamin C. Maglio, Ruth Rutter, Tobey Carman, Colin W. Edgar, Eugénie S. Euskirchen, Hélène Genet, Andrew Mullen, Valeria Briones, Elchin Jafarov, Kristen L. Manies
2024, Conference Paper, Proceedings of the 12th International Conference on Permafrost
Accurate representation of cryohydrological processes is fundamental for biosphere models, particularly at high-latitudes, given their influence on carbon and permafrost dynamics in carbon-rich peatlands and wetlands. This study analyzes site-level simulations in moist and wet drainage conditions in continuous or discontinuous permafrost regions, using a terrestrial ecosystem model DVM-DOS-TEM. Functional...
Indications of preferential groundwater seepage feeding northern peatland pools
Henry Moore, Xavier Comas, Martin A. Briggs, Andrew S. Reeve, Lee Slater
2024, Journal of Hydrology (638)
Groundwater seepage from underlying permeable glacial sedimentary structures, such as eskers, has been hypothesized to directly feed pools in northern peat bogs. These hypotheses directly contradict classical peat bog models for ombrogenous systems, wherein meteoric water is the sole water input...
Bioconcentration of per- and polyfluoroalkyl substances and precursors in fathead minnow tissues environmentally exposed to aqueous film-forming foam-contaminated waters
Nicholas I. Hill, Jitka Becanova, Simon Vojta, Larry B. Barber, Denis R. LeBlanc, Alan M. Vajda, Heidi M. Pickard, Rainer Lohmann
2024, Environmental Toxicology and Chemistry (43) 1795-1806
Exposure to per- and polyfluoroalkyl substances (PFAS) has been associated with toxicity in wildlife and negative health effects in humans. Decades of fire training activity at Joint Base Cape Cod (MA, USA) incorporated the use of aqueous film-forming foam (AFFF), which resulted in long-term...
Climate driven trends in historical extreme low streamflows on four continents
Glenn A. Hodgkins, Benjamin Renard, Paul H. Whitfield, Gregor Laaha, Kerstin Stahl, Jamie Hannaford, Donald H. Burn, Seth Westra, Anne K. Fleig, Walsczon Terllizzie Araujo Lopes, Conor Murphy, Luis Mediero, Martin Hanel
2024, Water Resources Research (60)
Understanding temporal trends in low streamflows is important for water management and ecosystems. This work focuses on trends in the occurrence rate of extreme low-flow events (5- to 100-year return periods) for pooled groups of stations. We use data from 1,184 minimally altered catchments in Europe, North and South America,...
Solute export patterns across the contiguous USA
Dustin W. Kincaid, Kristen L. Underwood, Scott Douglas Hamshaw, L. Li, Erin C. Seybold, Bryn Stewart, Donna M. Rizzo, Ijaz Ul Haq, Julia N. Perdrial
2024, Hydrological Processes (38)
Understanding controls on solute export to streams is challenging because heterogeneous catchments can respond uniquely to drivers of environmental change. To understand general solute export patterns, we used a large-scale inductive approach to evaluate concentration–discharge (C–Q) metrics across catchments spanning a broad range of catchment attributes and hydroclimatic drivers. We...
Peak streamflow trends in Illinois and their relation to changes in climate, water years 1921–2020
Mackenzie K. Marti, Thomas M. Over
2024, Scientific Investigations Report 2023-5064-B
This report characterizes changes in peak streamflow in Illinois and the relation of these changes to climatic variability, and provides a foundation for future studies that can address nonstationarity in peak-flow frequency analysis in Illinois. Records of annual peak and daily streamflow at streamgages and gridded monthly climatic data (observed...
Catchment coevolution and the geomorphic origins of variable source area hydrology
David G Litwin, Gregory E. Tucker, Katherine R. Barnhart, Ciaran Harman
2024, Water Resources Research (60)
Features of landscape morphology—including slope, curvature, and drainage dissection—are important controls on runoff generation in upland landscapes. Over long timescales, runoff plays an essential role in shaping these same features through surface erosion. This feedback between erosion and runoff generation suggests that modeling long-term landscape evolution together...
Diel temperature signals track seasonal shifts in localized groundwater contributions to headwater streamflow generation at network scale
David M. Rey, Danielle K. Hare, Jennifer H. Fair, Martin A. Briggs
2024, Journal of Hydrology (639)
Groundwater contributions to streamflow sustain aquatic ecosystem resilience; streams without significant groundwater inputs often have well-coupled air and water temperatures that degrade cold-water habitat during warm low flow periods. Widespread uncertainty in stream-groundwater connectivity across space and time has created disparate...