Filter Total Items: 143
Sunset at Big Meadows in Shenandoah National Park
Date Published: October 21, 2017
Status: Active

Climate change raises concern that risks of hydrological drought may be increasing. We estimate hydrological drought probabilities for rivers and streams in the United States (U.S.) using maximum likelihood logistic regression (MLLR). Streamflow data from winter months are used to estimate the chance of hydrological drought during summer months. Daily streamflow data collected from 9,144...

Roanoke River Valley
Date Published: October 8, 2017
Status: Active

The U.S. Geological Survey (USGS), in cooperation with the Virginia Department of Environmental Quality (DEQ), is monitoring the water quality of multiple high-priority streams where natural gas pipeline crossings have been proposed. The purpose of the monitoring effort is to collect baseline water-quality data and, if the pipeline construction is approved, to monitor water quality in these...

Adult and juvenile Piping Plovers (Kaiti Titherington/USFWS)
Date Published: September 5, 2017

Federally-listed as threatened since 1986, the Atlantic Coast Piping Plover (Charadrius melodus) population comprises fewer than 2,000 breeding pairs, according to the most recent census data. These breeding pairs are the target of the U.S. Fish and Wildlife Service’s (USFWS) species recovery plan.

Reptile specimens
Date Published: July 31, 2017

Scientists and staff of the USGS Patuxent Wildlife Research Center stationed at the Smithsonian National Museum of Natural History (NMNH) do research on the systematics and conservation of vertebrate species and curate and manage the North American collections of Amphibian, Reptile, Bird, and Mammal specimens and associated records.

Image of a new benchmark.
Date Published: June 24, 2017
Status: Active

The southern Chesapeake Bay region is experiencing land subsidence along with rising sea levels, both of which can contribute to coastal flooding. The rates at which these two processes are occurring are not exactly known. Mapping of land elevation change requires ground-truth survey data at multiple locations that are accurate and precise. With the exception of a few CORS sites that have...

Lick Run concrete lined channel with Mill Mountain in the background
Date Published: June 15, 2017
Status: Active

The U.S. Geological Survey, partnering with the City of Roanoke and Virginia Tech University, are working to monitor the water volume and quality in streams throughout the City of Roanoke. There is currently a single long-term monitoring station, Lick Run, within the city. The objective of this study is to create a model to compute suspended sediment concentrations and loads within the Lick...

Time of Concentration Estimates for Small Watersheds, WV
Date Published: June 13, 2017
Status: Active

Many culverts and other drainage structures in rural West Virginia are located in small streams or valleys draining 100 acres or less. Design of these structures in West Virginia is generally done using discharge estimates made with widely used and well accepted methods. However, these methods require information including flow-segment length and channel geometry that are poorly characterized...

Severn River, Annapolis, Maryland, a tributary to Chesapeake Bay, showing high sediment
Date Published: May 12, 2017
Status: Active

The 64,000-square mile watershed that drains to the Chesapeake Bay is highly populated and has diverse land use, including forested, agricultural, and urbanized areas. Increased precipitation in the eastern United States over the last 100 years has affected stream flow and thus the loading of pollutants delivered to the bay. Such pollutants as suspended sediment and dissolved phosphorus and...

Shenandoah municipal and industrial discharges
Date Published: May 1, 2017
Status: Active

A key component to assessing the contaminant exposure pathways in streams and rivers of the Chesapeake Bay is using GIS-based landscape analysis to identify sources of endocrine disrupting chemicals. Municipal and industrial wastewater treatment plant (WWTP) discharges are potentially major sources of EDCs to streams, and therefore understanding the de facto wastewater reuse (represented as...

Over wash fan created by Hurricane Sandy in a protected area of Fire Island National Seashore.
Date Published: April 27, 2017

The Challenge: The primary dune along barrier island beaches protects leeward vegetation from tidal fluctuation, salt spray and storm surge.  However, storm surges like those experienced during Hurricane Sandy can obliterate the primary dune, transporting sand inland and burying existing vegetation.  The dune rebuilds naturally as recovering vegetation traps wind-blown and waterborne sand. ...

Neonicotinoid pesticides act as agonists of nicotinic acetylcholine receptors
Date Published: March 21, 2017

The Challenge: Neonicotinoid pesticides act as agonists of nicotinic acetylcholine receptors (nAChRs) and are designed to be lethal to insects while theoretically posing little to no threat to vertebrates. The perceived safety of neonicotinoids has led to a sharp increase in their use in the United States and globally, since they were first introduced in 1994. The use of the neonicotinoid...