Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16731
Ground-water discharge and base-flow nitrate loads of nontidal streams, and their relation to a hydrogeomorphic classification of the Chesapeake Bay watershed, middle Atlantic Coast Ground-water discharge and base-flow nitrate loads of nontidal streams, and their relation to a hydrogeomorphic classification of the Chesapeake Bay watershed, middle Atlantic Coast
Existing data on base-flow and groundwater nitrate loads were compiled and analyzed to assess the significance of groundwater discharge as a source of the nitrate load to nontidal streams of the Chesapeake Bay watershed. These estimates were then related to hydrogeomorphic settings based on lithology and physiographic province to provide insight on the areal distribution of ground-water...
Authors
L. Joseph Bachman, Bruce D. Lindsey, John W. Brakebill, David S. Powars
Preliminary report on water quality associated with the abandoned Fontana and Hazel Creek Mines, Great Smoky Mountains National Park, North Carolina and Tennessee Preliminary report on water quality associated with the abandoned Fontana and Hazel Creek Mines, Great Smoky Mountains National Park, North Carolina and Tennessee
No abstract available.
Authors
R.R. Seal, J. M. Hammarstrom, C.S. Southworth, A. L. Meier, D.P. Haffner, A. P. Schultz, G.S. Plumlee, M.J. Flohr, J.C. Jackson, S. M. Smith, P. L. Hageman
Data Quality Objectives and Criteria for Basic Information, Acceptable Uncertainty, and Quality-Assurance and Quality-Control Documentation Data Quality Objectives and Criteria for Basic Information, Acceptable Uncertainty, and Quality-Assurance and Quality-Control Documentation
The Federal Highway Administration and State transportation agencies have the responsibility of determining and minimizing the effects of highway runoff on water quality; therefore, they have been conducting an extensive program of water-quality monitoring and research during the last 25 years. The objectives and monitoring goals of highway runoff studies have been diverse, because the...
Authors
Gregory E. Granato, Fred G. Bank, Patricia A. Cazenas
Recovery and validation of historical sediment quality data from coastal and estuarine areas: An integrated approach Recovery and validation of historical sediment quality data from coastal and estuarine areas: An integrated approach
A comprehensive database of sediment chemistry and environmental parameters has been compiled for Boston Harbor and Massachusetts Bay. This work illustrates methodologies for rescuing and validating sediment data from heterogeneous historical sources. It greatly expands spatial and temporal data coverage of estuarine and coastal sediments. The database contains about 3500 samples...
Authors
F.T. Manheim, Marilyn R. Buchholtz ten Brink, E.L. Mecray
The Toms Canyon structure, New Jersey outer continental shelf: A possible late Eocene impact crater The Toms Canyon structure, New Jersey outer continental shelf: A possible late Eocene impact crater
The Toms Canyon structure [~20-22 km wide] is located on the New Jersey outer continental shelf beneath 80-100 m of water, and is buried by ~1 km of upper Eocene to Holocene sedimentary strata. The structure displays several characteristics typical of terrestrial impact craters (flat floor; upraised faulted rim: brecciated sedimentary fill), but several other characteristics are atypical...
Authors
C. W. Poag, L.J. Poppe
Optical-cell evidence for superheated ice under gas-hydrate-forming conditions Optical-cell evidence for superheated ice under gas-hydrate-forming conditions
We previously reported indirect but compelling evidence that fine-grained H2O ice under elevated CH4 gas pressure can persist to temperatures well above its ordinary melting point while slowly reacting to form methane clathrate hydrate. This phenomenon has now been visually verified by duplicating these experiments in an optical cell while observing the very slow hydrate-forming process...
Authors
L.A. Stern, D.L. Hogenboom, W.B. Durham, S. H. Kirby, I.-M. Chou
Comparison of hydrochemical tracers to estimate source contributions to peak flow in a small, forested, headwater catchment Comparison of hydrochemical tracers to estimate source contributions to peak flow in a small, forested, headwater catchment
Three-component (throughfall, soil water, groundwater) hydrograph separations at peak flow were performed on 10 storms over a 2-year period in a small forested catchment in north-central Maryland using an iterative and an exact solution. Seven pairs of tracers (deuterium and oxygen 18, deuterium and chloride, deuterium and sodium, deuterium and silica, chloride and silica, chloride and...
Authors
Karen C. Rice, George M. Hornberger
Hydrodynamic forcing and sediment character in Boston Harbor Hydrodynamic forcing and sediment character in Boston Harbor
Calculated annual excess skin friction stress at various locations in Quincy Bay (outer Boston Harbor) was found to be correlated positively with sediment sand content. The correlation was optimized when a critical shear stress (??c) of 0.085 Pa was assumed for the bay. The excess shear stress was correlated negatively with sediment lead (Pb) and polychlorinated biphenyl (PCB)...
Authors
T.M. Ravens, O.S. Madsen, R. P. Signell, E.E. Adams, P.M. Gschwend
Oceanic methane hydrate: The character of the Blake Ridge hydrate stability zone, and the potential for methane extraction Oceanic methane hydrate: The character of the Blake Ridge hydrate stability zone, and the potential for methane extraction
Oceanic methane hydrates are mineral deposits formed from a crystalline 'ice' of methane and water in sea-floor sediments (buried to less than about 1 km) in water depths greater than about 500 m; economic hydrate deposits are probably restricted to water depths of between 1.5 km and 4 km. Gas hydrates increase a sediment's strength both by 'freezing' the sediment and by filling the pore...
Authors
M.D. Max, William P. Dillon
Chemical gradients in sediment cores from an EPA reference site off the Farallon Islands - Assessing chemical indicators of dredged material disposal in the deep sea Chemical gradients in sediment cores from an EPA reference site off the Farallon Islands - Assessing chemical indicators of dredged material disposal in the deep sea
Heavy metal and organic contaminants have been determined in undisturbed sediment cores from the US Environmental Protection Agency reference site for dredged material on the continental slope off San Francisco. As expected, the concentrations are significantly lower than toxic effects guidelines, but concentrations of PCBs, PAHs, Hg, Pb, and Clostridium perfringens (a bacterium spore...
Authors
Michael H. Bothner, P.W. Gill, W.S. Boothman, B.B. Taylor, Herman A. Karl
Metal concentrations in surface sediments of Boston Harbor: Changes with time Metal concentrations in surface sediments of Boston Harbor: Changes with time
The concentrations of metals in surface sediments of Boston Harbor have decreased during the period 1977–1993. This conclusion is supported by analysis of: (1) surface sediments collected at monitoring stations in the outer harbor between 1977 and 1993; (2) metal concentration profiles in sediment cores from depositional areas of the harbor; and (3) historical data from a contaminated...
Authors
Michael H. Bothner, Marilyn R. Buchholtz ten Brink, F.T. Manheim
Carbon Dioxide Control in Intensive Aquaculture: Version 2.1: User's Guide and Source Code Carbon Dioxide Control in Intensive Aquaculture: Version 2.1: User's Guide and Source Code
No abstract available at this time
Authors
B.J. Vinci, M.B. Timmons, S.T. Summerfelt, B.J. Watten