Science Inventory

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Nutrient pollution continues to impact water quality and degrade coastal ecosystems. Coastal eutrophication assessments are useful tools to track the effects of nutrient over-enrichment at large-scales and over time. These assessments often use response variables including chloro...

In 2021, GLTED scientists and collaborators participated in the Lake Michigan Cooperative Science and Monitoring Initiative. Our research team was responsible for analyzing nutrient chlorophyll a and zooplankton monitoring data from the field year. We analyzed for spatial differe...

Nitrogen isotopes are frequently used as an indicator of anthropogenic nitrogen loading at the local or regional scale. We were interested in assessing nitrogen isotope response in estuaries across the continental United States. In the summer of 2015, the EPA&rsquo;s National Coa...

The San Juan Bay Estuary (SJBE) is an estuarine system situated in highly developed and urbanized San Juan, Puerto Rico. Due to increased residential development in the 1950s, the Ca&ntilde;o Mart&iacute;n Pe&ntilde;a (CMP), a channel which connects lagoons to the bay has increas...

Anthropogenic salt inputs have increasingly impacted many streams in the U.S. for more than a century. Urban stream salinity is often chronically elevated and punctuated by episodic salinization events after applications of road salt, which can last hours to days after snowstorms...

Diatoms are excellent indicators of water quality and can be used as a tool for biological assessment. Aquatic ecosystems span across state boundaries and the northeast states have a long-standing interest in taking a regional approach to developing water quality criteria for lak...

This presentation highlights challenges and strategies for applying mechanistic simulation models to decision making. Case studies are presented using ORD's Coastal Generalized Ecosystem Model (CGEM), emphasizing different results and applications from the northern Gulf of Mexico...

In collaboration with University of Washington and NOAA marine ecosystem modelers participating in the new Puget Sound Integrated Modeling Framework ( PSIMF ) project, ORD&rsquo;s VELMA watershed modeling team is estimating environmental impacts of alternative future land use and...

Eutrophication, harmful algal blooms, and human health impacts are critical environmental challenges resulting from excess nitrogen and phosphorus in surface waters. Yet we have limited information regarding how wetland characteristics mediate water quality across watershed scale...

This is a requested presentation for the EPA-NOAA Climate- Water Quality Workshop on EPA&rsquo;s Coastal Nutrient Research. This presentation provides an overview of EPA Coastal Research for including tools available to characterize nutrient inputs and the response of several end...

Coastal eutrophication is a prevalent threat to the healthy functioning of ecosystems globally. While degraded water quality can be detected by monitoring oxygen, nutrient concentrations, and algal abundance, establishing regulatory guidelines is complicated by a lack of baseline...

Wildfire activity is increasing and can be linked to climate change effects, including rising global temperatures and more frequent drought conditions. Wildfire emissions impact human health and sensitive ecosystems, particularly in the western United States where large fire freq...

Diatoms are excellent indicators of water quality and can be used as a tool for biological assessment. Aquatic ecosystems span across state boundaries and the northeast states have a long-standing interest in taking a regional approach to developing water quality criteria for lak...

Freshwater Salinization Syndrome (FSS) refers to the interactive effects of salt ions on the degradation of the natural, built, and social systems. FSS can mobilize chemical mixtures, termed &lsquo;chemical cocktails&rsquo;, in watersheds. The formation of chemical cocktails acro...

Abstract:&nbsp; Nutrient inputs to the landscape often move beyond their intended human uses in agricultural or urban systems, unintentionally being released to air, deeper soils, wetlands, groundwater, streams, rivers, lakes, and coastal areas.&nbsp; Added nitrogen or phosphorus...

Promise and Problems of Real-Time Nitrate Monitoring to Inform Watershed Management in the Nooksack Basin. David Hooper1, Rich Sheibley2, Craig Senter3, Jana Compton4 1Western Washington University, 2USGS Washington Water Science Center, 3USGS Pacific Islands Water Science Center...

Constructed subsurface wetlands are widely used to treat wastewater and diffuse source pollutants. A cell-averaged subsurface flow numerical model has been recently developed to specifically solve water quality problems at scales coarser than the high-resolution point-scale model...

Urban water systems are not self-contained units, economically or ecologically.  They rely on larger biophysical supports from natural capital.  The behavior of such systems as a whole and the interactions between subcomponents can be observed.  The optimization at system level t...

Flooded soil environments like wetland and riparian areas are transformers of trace elements and nutrients in large part because of anoxic redox cycling of Fe. Under common flooded soil conditions, biogeochemical processes solubilize Fe by reductive dissolution and release Fe(II)...

Using reference sites to establish appropriate biological benchmarks to assess biological condition is challenging because of the ubiquity of anthropogenic impacts. We circumvent the need for reference sites using joint species distribution models to predict the benthic macroinve...

Comprehensive sampling of the carbonate system in estuaries and coastal waters can be difficult and expensive because of the complex and heterogeneous nature of near-shore environments. We show that sample collection by community science programs is a viable strategy for expandin...

Travis Linscome-Hatfield, a statistician at Neptune, has created the 4 R scripts that can be run to produce 4 htmls for a spatial stream network (SSN) analysis. The scripts are meant to be &quot;plug and play&quot; in that an SSN object can be loaded for a specific Indiana basin ...

The Animas and San Juan Rivers were extensively monitored for metals in the water and sediments by EPA, state and tribal agencies during and through the year following the Gold King Mine release that occurred in August 2015. &nbsp;Congress funded additional water quality monitori...

Effective water quality management is based on associations between at least two pieces of information: a stressor and a response. However, assessments are hindered by the lack of pre-developed stressor-response associations. To remedy this, we developed genus stressor-specific s...

Effective water quality management is based on associations between at least two pieces of information: a stressor and a response. However, assessments are hindered by the lack of pre-developed stressor-response associations. To remedy this, we developed stressor-specific genus s...