Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16795
Methods of measurement of exploratory well impacts, offshore Florida
Six offshore oil well tests were drilled off Key West in the late 1950s and early 1960s. Two wells were drilled on coral bottom, two on carbonate sand, and two on mixed turtle grass and gorgonian/sponge hardbottom. After locating the sites with a proton magnetometer; several underwater assessment methods were used to measure the ecological impacts of drilling. Because of differing environments and
Authors
Phillip A. Dustan, Jack L. Kindinger, B. H. Lidz, J.H. Hudson
Numerical simulation of tidal dispersion around a coastal headland
Tidal flows around headlands can exhibit strong spatial gradients in the Eulerian currents, resulting in complex Lagrangian trajectories and dispersion of the vertically integrated flow. This typically occurs when the horizontal length scale of the headland is comparable to or smaller than the tidal excursion. The effects of these headlands on dispersion are investigated using a depthaveraged hydr
Authors
R. P. Signell, W. Rockwell Geyer
Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 1. Geochemical considerations
The addition of alkaline materials to supplement deficient "neutralization potential" (NP) of mine spoil, and thus to prevent or abate acid mine drainage, has riot been successful at most surface coal mines in Pennsylvania. A basic problem may have been improper accounting for acid‐production potential and thus inadequate addition rates of calcium carbonate (CaCO3 ), calcium oxide (CaO) , or calci
Authors
Charles A. Cravotta, Keith Brady, Michael W. Smith, Richard L. Beam
Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 2. Mine site case studies
The effectiveness of preventing or ameliorating acid mine drainage (AMD) through the application of alkaline additives is evaluated for eight surface coal mines in Pennsylvania. Many of the mine sites had overburden characteristics that made prediction of post‐mining water quality uncertain. Alkaline materials were applied at rates ranging from 42 to greater than 1,000 tons as calcium carbonate pe
Authors
Keith Brady, Michael W. Smith, Richard L. Beam, Charles A. Cravotta
Reevaluation of large-scale dispersivities for a waste chloride plume: Effects of transient flow
This paper investigates the effects of transient groundwater flow on dispersion of a waste chloride plume in the basaltic aquifer beneath the Idaho (USA) National Engineering Laboratory. In an early application of numerical modeling techniques to the two-dimensional simulation of field-scale plumes, previous investigators identified longitudinal and transverse dispersivities using an independently
Authors
Daniel J. Goode, Leonard F. Konikow
Preliminary delineation of contaminated water-bearing fractures intersected by open-hole bedrock wells
Contaminated water‐bearing fractures intersected by open‐hole bedrock wells were preliminarily delineated through a combination of geophysical logging, vertical‐flow measurements, and downhole water sampling as part of remedial site investigations in southeastern New York. The wells investigated range from 100 to 450 feet in depth, have only shallow surface casing, and intersect multiple water‐bea
Authors
John H. Williams, Randall W. Conger
Minerals Yearbook, volume II, Area Reports — Domestic
The U.S. Geological Survey (USGS) Minerals Yearbook discusses the performance of the worldwide minerals and materials industries and provides background information to assist in interpreting that performance. Content of the individual Minerals Yearbook volumes follows:Volume I, Metals and Minerals, contains chapters about virtually all metallic and industrial mineral commodities important to the U
Authors
Survival rates of birds of tropical and temperate forests: Will the dogma survive?
Survival rates of tropical forest birds are widely assumed to be high relative to the survival rates of temperate forest birds. Much life-history theory is based on this assumption despite the lack of empirical data to support it. We provide the first detailed comparison of survival rates of tropical and temperate forest birds based on extensive data bases and modern capture-recapture models. We
Authors
James R. Karr, James D. Nichols, M. K. Klimkiewicz, J. D. Brawn
A review of the evidence for the effects of hunting on American black duck populations
No abstract available.
Authors
M.J. Conroy, D.G. Krementz
Power calculations and model selection for trend analysis: A comment
No abstract available.
Authors
William A. Link, Jeff S. Hatfield
Occurrence of the long-tailed cuckoo Eudynamis taitensis on Caroline Atoll, Kiribati
No abstract available.
Authors
David H. Ellis, Cameron B. Kepler, Angela K. Kepler, K. Teeb'aki
Selenium accumulation and elimination in mallards
Selenium accumulation and loss were measured in adult mallards (Anas platyrhynchos) fed selenomethionine during two experiments. In Experiment 1, both sexes were fed a diet containing 10 ppm selenium for 6 weeks, followed by 6 weeks on untreated feed. Selenium accumulation in liver and muscle of females was described by C=A(1−e−bt). Concentrations of selenium were predicted to reach 95% of equilib
Authors
Gary Heinz, Grey W. Pendleton, Alexander J. Krynitsky, L. G. Gold