Determining low-flow conditions at select streams to Barnegat Bay-Little Egg Harbor as the first step towards the development of ecological-flow targets
Christine M. Wieben, Jonathan G. Kennen, Thomas P. Suro
2025, Scientific Investigations Report 2024-5096
Maintaining streamflow to support human water needs and ecosystem services requires a fundamental understanding of the relations between changes in streamflow processes and ecosystem responses. Changes in the natural patterns in flow, geology, and topography alter the habitats that aquatic organisms rely on for food, shelter, and reproduction. The U.S....
Updating and recalibrating the integrated Santa Rosa Plain Hydrologic Model to assess stream depletion and to simulate future climate and management scenarios in Santa Rosa, Sonoma County, California
Ayman H. Alzraiee, Andrew Rich, Linda R. Woolfenden, Derek W. Ryter, Enrique Triana, Richard G. Niswonger
2025, Scientific Investigations Report 2024-5121
The Santa Rosa Plain Hydrologic Model (SRPHM) was developed and published in 2014 through a collaboration between the U.S. Geological Survey (USGS) and Sonoma Water to analyze the hydrologic system in the Santa Rosa Plain watershed, help meet the increasing demand for fresh water, and prepare for future uncertainties in...
Assessment of effects of channelization mitigation alternatives of Stoney Brook, Carlton and St. Louis Counties, Minnesota
Charles V. Cigrand
2025, Scientific Investigations Report 2025-5004
The U.S. Geological Survey, in cooperation with the Fond du Lac Band of Lake Superior Chippewa (FDLB), studied the effects of channel modification alternatives on lake levels and floodplain inundation in the Stoney Brook watershed in northeast Minnesota. Northern wild rice (Zizania palustris), also referred to as manoomin by the...
Distribution and disturbances of ditches across salt marshes of the Northeast U.S. with implications for management and restoration
Erin K. Peck, Julie E. Walker, Kate Ackerman, Joel A. Carr, Maureen D. Correll, Zafer Defne, Linda A. Deegan, Mitchell J. Eaton, Neil K. Ganju, Mitch Hartley, Catherine Johnson, Jason J Mercer, Katharine J. Ruskin, Jonathan D. Woodruff, Brian Yellen
2025, Journal of Environmental Management (376)
Effective management of valuable coastal systems, such as salt marshes requires an understanding of the complex stressors influencing their continued threat of drowning. However, efforts to determine the effects of one potential stressor, ditches, have produced diverging results complicating management efforts. Ditches (linear trenches dug to drain salt marshes for...
Invasion of perennial sagebrush steppe by shallow-rooted exotic cheatgrass reduces stable forms of soil carbon in a warmer but not cooler ecoregion
Sydney Maya Katz, Toby Matthew Maxwell, Marie-Anne de Graaff, Matthew J. Germino
2025, Environmental Research Communications (7)
Soil organic carbon ('SOC') in drylands comprises nearly a third of the global SOC pool and has relatively rapid turnover and thus is a key driver of variability in the global carbon cycle. SOC is also a sensitive indicator of longer-term directional change and disturbance-responses of ecosystem C storage. Biome-scale...
Prioritization of research on drought assessment in a changing climate
Joel Lisonbee, Britt Parker, Erica Fleishman, Trent Ford, R. Kyle Bocinsky, Gretel Follingstad, Abby G. Frazier, Zachary H. Hoylman, Amy R. Hudson, John W. Nielsen-Gammon, Natalie A. Umphlett, Elliot Wickham, Aparna Bamzai-Dodson, Royce Fontenot, Brian Fuchs, John C. Hammond, Jeffrey E. Herrick, Mike Hobbins, Andy Hoell, Jacob Jones, Erin Lane, Zack Leasor, Yongqiang Liu, Jason A. Otkin, Amanda Sheffield, Dennis Todey, Roger Pulwarty
2025, Earth's Future (13)
Drought is a period of abnormally dry weather that leads to hydrological imbalance. Drought assessments determine the characteristics, severity, and impacts of a drought. Climate change adds conceptual and quantitative challenges to traditional drought assessments. This paper highlights the challenges of assessing drought in a climate made non-stationary by human...
The effects of unpaved roads on instream sediment: Patterns and challenges for monitoring
Robert Al-Chokhachy, Geoffrey C. Poole, Cameron Thomas, Carl Saunders, Brett B. Roper, Shane Hendrickson, Cory Davis, Kyle Crapster, Eric Archer
2025, Journal of the American Water Resources Association (61)
Despite > 700,000 km of unpaved roads in the western United States, our knowledge of how roads impact instream sediment is unclear. We combined two studies, including (1) a regional analysis linking stream habitat data from a large-scale monitoring program with road density data to identify generalizable relationships between roads and streambed...
Watershed hydrology assessment for the Nueces River basin–Appendix D, RiverWare analyses
David Wallace
2025, Report
No abstract available....
Watershed hydrology assessment for the Nueces River basin--Appendix A, statistical hydrology.
David Wallace, Kara M. Watson
2025, Report
No abstract available....
ARCHI: A new R package for automated imputation of regionally correlated hydrologic records
Zeno Levy, Robin L. Glas, Timothy J. Stagnitta, Neil Terry
2025, Groundwater (62) 595-610
Missing data in hydrological records can limit resource assessment, process understanding, and predictive modeling. Here, we present ARCHI (Automated Regional Correlation Analysis for Hydrologic Record Imputation), a new, open-source software package in R designed to aggregate, impute, cluster, and visualize regionally correlated hydrologic records. ARCHI imputes missing data in “target”...
The role of bedrock circulation depth and porosity in mountain streamflow response to prolonged drought
Rosemary W.H. Carroll, Andrew H. Manning, Kenneth H. Williams
2025, Geophysical Research Letters (52)
Quantitative understanding is lacking on how the depth of active groundwater circulation in bedrock affects mountain streamflow response to a multi‐year drought. We use an integrated hydrological model to explore the sensitivity of a variety of streamflow metrics to bedrock circulation depth and porosity under a plausible extreme drought scenario lasting...
Analyzing multi-year nitrate concentration evolution in Alabama aquatic systems using a machine learning model
Bahareh KarimiDermani, Christopher Green, Geoffrey Tick, Hossein Gholizadeh, Wei Wei, Yong Zhang
2025, Environments (12)
Rising nitrate contamination in water systems poses significant risks to public health and ecosystem stability, necessitating advanced modeling to understand nitrate dynamics more accurately. This study applies the long short-term memory (LSTM) modeling to investigate the hydrologic and environmental factors influencing nitrate concentration dynamics in rivers and aquifers across the...
Reviews and syntheses: Variable inundation across Earth's terrestrial ecosystems
James Stegen, Amy J. Burgin, Michelle H. Busch, Joshua B. Fisher, Joshua Ladau, Jenna Abrahamson, Lauren Kinsman-Costello, Li Li, Xingyuan Chen, Thibault Datry, Nate McDowell, Corianne Tatariw, Anna Braswell, Jillian M. Deines, Julia A. Guimond, Peter Regier, Kenton Rod, Edward K.P. Bam, Etienne Fluet-Chouinard, Inke Forbrich, Kristin Jaeger, Teri O'Meara, Timothy D. Scheibe, Erin Seybold, Jon N. Sweetman, Jianqiu Zheng, Daniel C. Allen, Elizabeth Herndon, Beth Middleton, Scott Painter, Kevin Roche, Julianne Scamardo, Ross Vander Vorste, Kristin Boye, Ellen Wohl, Margaret Zimmer, Kelly Hondula, Maggi Laan, Anna Marshall, Kaizad F. Patel
2025, Biogeosciences (22) 995-1034
The structure, function, and dynamics of Earth's terrestrial ecosystems are profoundly influenced by how often (frequency) and how long (duration) they are inundated with water. A diverse array of natural and human-engineered systems experience temporally variable inundation whereby they fluctuate between inundated and non-inundated states. Variable inundation spans extreme events...
Hydroclimate projections and effects on runoff at National Wildlife Refuges in the semi-arid western U.S.
Brian S. Caruso, Lauren Ellissa Eng, Andrew R. Bock, Nicholas Graff Hall
2025, JAWRA Journal of the American Water Resources Association (61)
This study evaluated hydroclimate projections and effects on runoff at National Wildlife Refuges in a semiarid region of the western United States (U.S. Fish and Wildlife Service Region 6) using mean air temperature (TAVE) and precipitation (PPT) inputs and runoff (RO) output from a national application of a Monthly Water...
James Buttle review: The characteristics of baseflow resilience across diverse ecohydrological terrains
Martin A. Briggs, Connor P. Newman, Joshua Robert Benton, David M. Rey, Christopher Konrad, Valerie Ouellet, Christian E. Torgersen, Lance R. Gruhn, Brandon J. Fleming, Christopher L. Gazoorian, Daniel H. Doctor
2025, Hydrological Processes (39)
The dynamic storage of aquifers is the portion of groundwater that can potentially drain to any given point along a stream to create baseflow. Baseflow typically occurs year-round in perennial streams, though the characteristics and stability of dynamic storage are often most important to instream processes during extended dry periods...
A new groundwater energy transport model for the MODFLOW hydrologic simulator
Eric D. Morway, Alden M. Provost, Christian D. Langevin, Joseph D. Hughes, Martijn J. Russcher, Chieh-Ying Chen, Yu-Feng Lin
2025, Groundwater (63) 409-421
Heat transport in the subsurface is an important aspect of research related to the effects of a warming climate on ecological services (i.e., cold-water refugia); the development of geothermal resources for energy banking schemes (i.e., aquifer thermal energy storage [ATES]); and the effects of temperature on other aspects of groundwater...
Confluence of time and space: An innovation for quantifying dynamics of hydrologic floodplain connectivity with remote sensing and GIS
Hafez Ahmad, Leandro E. Miranda, Corey Garland Dunn, Melanie R. Boudreau, Michael E. Colvin, Padmanava Dash
2025, River Research and Applications (41) 1014-1029
Hydrologic connectivity is a crucial determinant of aquatic ecosystem services, governing the exchange of nutrients, sediments, chemicals, and biota. Various indices and metrics exist for quantifying hydrologic connectivity across diverse environments and scales. However, existing methodologies often fail to adequately capture lateral connectivity between floodplain lakes and streams across vast,...
Preprint: Simulated seasonal loads of total nitrogen and total phosphorus by major source from watersheds draining to Washington waters of the Salish Sea, 2005 through 2020
Noah Schmadel, Cristiana Figueroa-Kaminsky, Daniel Wise, Jamie K. Wasielewski, Zachary Johnson, Robert W. Black
2025, Preprint
The U.S. Geological Survey (USGS) and the Washington State Department of Ecology (Ecology) have developed watershed models of seasonal load estimates of total nitrogen (TN) and total phosphorus (TP) discharging into the Washington waters of the Salish Sea from 2005 through 2020. The modeling approach used was dynamic SPARROW (SPAtially...
Concentration-discharge relations and transient metal loads reveal spatiotemporal variability in solute-generation mechanisms in a mine-affected watershed
Connor P. Newman, Alexis Navarre-Sitchler, Robert L. Runkel, Rory M. Cowie
2025, Journal of Contaminant Hydrology (269)
Concentration-discharge (CQ) relations are commonly used to understand geochemical and hydrologic controls on the generation of solutes in watersheds. Despite the widespread application of CQ relations, this technique has been infrequently applied to acid mine drainage (AMD) sites, but the CQ framework may allow mechanistic understanding of remedial outcomes such...
Determining the effects of reduced water availability on seed germination of five bottomland hardwood tree species
Charles J. Pell, Sammy L. King, Tracy S. Hawkins, Matt Symmank
2025, Forest Ecology and Management (577)
Globally, floodplain forests are experiencing shifts in species composition associated with drier conditions and disruptions of flood pulse hydrology. The specific processes behind these shifts in composition are not fully understood, but differential effects of drought on regeneration processes such as seed germination may be partially responsible. To determine how...
Myiasis infection by the toad fly (Lucilia bufonivora; Calliphoidae) in amphibians in Montana, USA
Leah M. Fischer, Blake R. Hossack
2025, Journal of Wildlife Diseases (61) 206-2011
Toad flies in the genus Lucilia (previously referred to as Bufolucilia spp.) parasitize and cause myiasis in several amphibian species in North America. From 2019 to 2022, we documented Lucilia bufonivora infections in post-metamorphic western toads (Anaxyrus boreas) during amphibian surveys in four wetlands in Glacier National Park, Montana, US. We found nine infected adult toads in...
Mapping bedrock outcrops in the Sierra Nevada Mountains (California, USA) using machine learning
Apoorva Ramesh Shastry, Corina Cerovski-Darriau, Brian Coltin, Jonathan D. Stock
2025, Remote Sensing (17)
Accurate, high-resolution maps of bedrock outcrops can be valuable for applications such as models of land–atmosphere interactions, mineral assessments, ecosystem mapping, and hazard mapping. The increasing availability of high-resolution imagery can be coupled with machine learning techniques to improve regional bedrock outcrop maps. In the United States, the existing 30...
Groundwater hydrology, groundwater and surface-water interactions, water quality, and groundwater-flow simulations for the Wet Mountain Valley alluvial aquifer, Custer and Fremont Counties, Colorado, 2017–19
Connor P. Newman, Cory A. Russell, Zachary D. Kisfalusi, Suzanne S. Paschke
2025, Scientific Investigations Report 2024-5105
In 2017, the U.S. Geological Survey, in cooperation with the Upper Arkansas Water Conservancy District, began a study to provide a comprehensive analysis of the Wet Mountain Valley alluvial aquifer, Custer and Fremont Counties, Colorado. The study included collection of data pertaining to groundwater hydrology, groundwater and surface-water interactions, and...
Hotter temperatures alter riparian plant outcomes under regulated river conditions
Emily C. Palmquist, Kiona Ogle, Bradley J. Butterfield, Thomas G. Whitham, Gerard J. Allan, Patrick B. Shafroth
2025, Ecological Monographs (95)
Climate change and river regulation alter environmental controls on riparian plant occurrence and cover worldwide. Simultaneous changes to river flow and air temperature could result in unanticipated plant responses to novel environmental conditions. Increasing temperature could alter riparian plant response to hydrology and other factors, while river regulation may exacerbate...
Decomposing the Tea Bag Index and finding slower organic matter loss rates at higher elevations and deeper soil horizons in a minerogenic salt marsh
Satyatejas G. Reddy, W. Reilly Farrell, Fengrun Wu, Steven C. Pennings, Jonathan Sanderman, Meagan J. Eagle, Christopher Craft, Amanda C. Spivak
2025, Biogeosciences (22) 435-453
Environmental gradients can affect organic matter decay within and across wetlands and contribute to spatial heterogeneity in soil carbon stocks. We tested the sensitivity of decay rates to tidal flooding and soil depth in a minerogenic salt marsh using the Tea Bag Index (TBI). Tea bags were buried at 10...
