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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Triton's plumes: Discovery, characteristics, and models
This chapter presents (1) basic observations and characteristics of Triton's plumes (scale, geometry, optical properties, and temporal behavior); (2) the current best estimates of other parameters that can be derived directly or inferred from the observations (plume duration, wind velocities, particle properties, mass fluxes, energy requirements, and total erupted mass); and (3) a discussion of va
Authors
Randolph L. Kirk, Laurence A. Soderblom, R. H. Brown, S. W. Kieffer, J.S. Kargel
Seagrass distribution in the Northern Gulf of Mexico
Seagrass ecosystems are widely recognized as some of the most productive benthic habitats in estuarine and nearshore waters of the gulf coast. Seagrass meadows provide food for wintering waterfowl and important spawning and foraging habitat for several species of commercially important finfish and shellfish. Physical structure provided by seagrasses affords juveniles refuge from predation and allo
Authors
Lawrence R. Handley
Biodiversity: a new challenge
Resource managers at many state and federal agencies are in the middle of a fundamental change in the practice and objectives of conservation. Traditional management has been directed toward maintaining, usually for harvest purposes, populations of individual species such as ducks, deer, or salmon. Increasingly, however, resource managers are recognizing the critical important of conserving biolog
Authors
Edward T. LaRoe
Evaluation of viscoplastic slope movement based on triaxial tests
Viscoplastic soil parameters are used in a nonlinear viscoplastic constitutive model to predict time-dependent displacement of slow-moving landslides. The viscoplastic material parameters are determined by a novel method that uses a standard triaxial apparatus. This method employs data obtained from consolidated drained triaxial tests and consolidated drained stress-controlled strain-rate tests. T
Authors
Wylie W. -H. Wong, Carlton L. Ho, Richard M. Iverson, Cynthia Hovind
Northern Pintail (Anas acuta)
The Northern Pintail is a medium-sized dabbling duck of slender, elegant lines and conservative plumage coloration. It is circumpolar in distribution and abundant in North America, with core nesting habitat in Alaska and the Prairie Pothole Region of southern Canada and the northern Great Plains. Breeders favor shallow wetlands interspersed throughout prairie grasslands or arctic tundra. An early
Authors
J. E. Austin, M. R. Miller
Applications of the transient tracers tritium/helium-3, and chlorofluorocarbons for tracing and age-dating yound ground water: Field examples from the USA and Germany
The transient tracers tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFC-11, CFC-12, CFC-113) are well suited for tracing and age-dating young ground water. Their detection in ground water indicates waters recharged within the past 30 (3H/3He, CFC-113) to 50 (CFC-11, CFC-12) years, or ground water mixtures that contain at least a portion of young water. The ground water age can be determined i
Authors
S. Drenkard, Niel Plummer, Eurybiades Busenberg, P. Schlosser, M. Stute, H. Dorr
Jurassic tectonics of northeastern Nevada and northwestern Utah from the perspective of barometric studies
Jurassic tectonism in the northeastern Great Basin produced varied structures, many closely associated with widespread magmatism at ca. 155–165 Ma and with local metamorphism. Many of the plutons are of suitable mineralogy for Al-in-hornblende barometry, providing the potential for depth data. We have studied conditions of metamorphism in the Pilot Range and barometry for six Jurassic plutons acro
Authors
David M. Miller, Thomas D. Hoisch
Interpreting spatial profiles of concentration in acid mine drainage streams
No abstract available.
Authors
R. E. Broshears, Briant A. Kimball, Robert L. Runkel
Feeding competition between larval lake whitefish and lake herring
The potential for competition for food between larval lake whitefish (Coregonus clupeaformis) and lake herring (C. artedi) 1- to 8-wk of age was explored in a series of 1-h laboratory feeding studies. Feeding started at 2-wk post-hatch. Learning and fish size appear to be more important than prey density at the onset of feeding. Species differed in their feeding behavior and consumption noticeably
Authors
Jacqueline F. Savino, Patrick L. Hudson
Timing of emplacement of the Haypress Creek and Emigrant Gap plutons: Implications for the timing and controls of Jurassic orogenesis, northern Sierra Nevada, California
Pre-Cretaceous rocks in the northern Sierra Nevada are subdivided from west to east into the Smartville, central, Feather River peridotite, and eastern belts. Cretaceous and younger sedimentary rocks form the western boundary of the Smartville belt, but various reverse-fault segments of the Foothills fault system separate the other belts. The Foothills fault system and associated structures involv
Authors
Gary H. Girty, Richard E. Hanson, Melissa S. Girty, Richard A. Schweickert, David S. Harwood, Aaron S. Yoshinobu, Kevin A. Bryan, June E. Skinner, Chris A. Hill
Bermuda solution pipe soils: A geochemical evaluation of eolian parent materials
No abstract available.
Authors
Stanley R. Herwitz, Daniel R. Muhs
The value of postaudits in groundwater model applications
No abstract available.
Authors
Leonard F. Konikow