Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16746
National water summary on wetland resources National water summary on wetland resources
This National Water Summary on Wetland Resources documents wetland resources in the United States. It presents an overview of the status of knowledge of wetlands at the present time-what they are, where they are found, why they are important, and the controversies surrounding them, with an emphasis on their hydrology. Wetland resources in each State, the District of Columbia (combined...
Direct simulation of groundwater age Direct simulation of groundwater age
A new method is proposed to simulate groundwater age directly, by use of an advection-dispersion transport equation with a distributed zero-order source of unit (1) strength, corresponding to the rate of aging. The dependent variable in the governing equation is the mean age, a mass-weighted average age. The governing equation is derived from residence-time-distribution concepts for the...
Authors
Daniel J. Goode
Predicting watershed acidification under alternate rainfall conditions Predicting watershed acidification under alternate rainfall conditions
The effect of alternate rainfall scenarios on acidification of a forested watershed subjected to chronic acidic deposition was assessed using the model of acidification of groundwater in catchments (MAGIC). The model was calibrated at the Panola Mountain Research Watershed, near Atlanta, Georgia, U.S.A. using measured soil properties, wet and dry deposition, and modeled hydrologic...
Authors
Thomas G. Huntington
Amelioration of surface waters affected by acidic deposition Amelioration of surface waters affected by acidic deposition
No abstract available.
Authors
R.K. Schreiber
Water Resources Data, Virginia, Water Year 1995; Volume 2. Ground-Water-Level and Ground-Water-Quality Records Water Resources Data, Virginia, Water Year 1995; Volume 2. Ground-Water-Level and Ground-Water-Quality Records
No abstract available.
Authors
Water Resources Division U.S. Geological Survey
Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays
High concentrations of osmium (Os) and silver (Ag) and low 187Os/186Os ratios in Boston sewage make these elements sensitive tracers of the influence of sewage on marine sediments in Massachusetts and Cape Cod bays. Pristine marine sediments have Ag concentrations more than 200 times lower than sewage sludge, Os concentrations 10-40 times lower, and 187Os/186Os ratios six times higher...
Authors
G.E. Ravizza, Michael H. Bothner
Pb and O isotopic constraints on the source of granitic rocks from Cape Breton Island, Nova Scotia, Canada Pb and O isotopic constraints on the source of granitic rocks from Cape Breton Island, Nova Scotia, Canada
Pb isotopic compositions of leached feldspars from twenty-three plutons in Cape Breton Island can be divided into two groups: anorthosite, syenite, and granite in the Blair River Complex, which have the least radiogenic compositions on the Island, and granitic rocks from terranes (Aspy, Bras d'Or, and Mira) to the south. Pb isotopic data for the Blair River Complex (206Pb/204Pb = 17.399...
Authors
Robert A. Ayuso, S. M. Barr, Frederick J. Longstaffe
Pellets versus feces: their relative importance describing the food habits of double-crested cormorants Pellets versus feces: their relative importance describing the food habits of double-crested cormorants
We compared the amount of taxonomically identifiable (diagnostic) fish remains in double-crested cormorant (Phalacrocorax auritus) feces to that exiting the birds via regurgitated pellets. Feces and pellets were collected concurrently during June 1994 from cormorant colonies on Little Galloo Island, eastern Lake Ontario. About 90% of the diagnostic fish remains were found in pellets and...
Authors
J. H. Johnson, R. M. Ross
Nature of Aeromonas salmonicida carriage on asymptomatic rainbow trout maintained in a culture system with recirculating water and fluidized sand biofilters Nature of Aeromonas salmonicida carriage on asymptomatic rainbow trout maintained in a culture system with recirculating water and fluidized sand biofilters
An asymptomatic carrier population of rainbow trout Oncorhynchus mykiss was examined for Aeromonas salmonicida by primary dilution counts on Coomassie Brilliant Blue agar and also by streaking on bacteriological media after a 24–48-h pre-enrichment in tryptic soy broth. The pathogen was detected by primary dilution plate counts in 1 spleen, 15 gill, and 19 mucus samples of the 100 trout...
Authors
R. C. Cipriano, G. L. Bullock, A. Noble
A passive integrated transponder (PIT) tag system for monitoring fishways A passive integrated transponder (PIT) tag system for monitoring fishways
An application of passive integrated transponder (PIT) technology was used to monitor movements of adult American shad (Alosa sapidissima), blueback herring (A. aestivalis) and gizzard shad (Dorosoma cepedianum) in two experimental fishways. Tag reading efficiency was between 88–96%, detection ranges were 50–100 cm from orifices of 3100–9600 cm2, and read rates were 5–7 Hz. The system...
Authors
Theodore R. Castro-Santos, Alexander Haro, S. Walk
Silt heavy-mineral distributions off the Southeastern United States Silt heavy-mineral distributions off the Southeastern United States
Until recently heavy-mineral studies of marine sediments were largely restricted to sand fractions. New techniques permitting analysis of decalcified silt fractions have been applied to sediments off the southeastern United States. Our data, which confirm predictions from the basic relationship among grain size, specific gravity, and equivalent hydraulic transport behavior, show that
Authors
L.J. Poppe, J.A. Commeau