Simulation modeling in a workshop format
Gregor T. Auble, D. B. Hamilton, J. E. Roelle, A. K. Andrews
1995, Book chapter, Complex ecology: The part-whole relation in ecosystems
No abstract available....
Triton's plumes: Discovery, characteristics, and models
Randolph L. Kirk, Laurence A. Soderblom, R. H. Brown, S. W. Kieffer, J.S. Kargel
Dale P. Cruikshank, editor(s)
1995, Book chapter, Neptune and Triton
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);...
Evaluation of viscoplastic slope movement based on triaxial tests
Wylie W. -H. Wong, Carlton L. Ho, Richard M. Iverson, Cynthia Hovind
1995, Book chapter, Clay and shale slope instability
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....
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
S. Drenkard, Niel Plummer, Eurybiades Busenberg, P. Schlosser, M. Stute, H. Dorr
1995, Book chapter, Contaminated soil '95: Soils & environment
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...
Jurassic tectonics of northeastern Nevada and northwestern Utah from the perspective of barometric studies
David M. Miller, Thomas D. Hoisch
Cathy Busby, editor(s)
1995, Book chapter, Jurassic magmatism and tectonics of the North American cordillera
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...
Preliminary development of the LBL/USGS three-dimensional site-scale model of Yucca Mountain, Nevada
1995, Book
A three-dimensional model of moisture flow within the unsaturated zone at Yucca Mountain is being developed at Lawrence Berkeley Laboratory (LBL) in cooperation with the U.S. Geological Survey (USGS). This site-scale model covers and area of about 34 km2 and is bounded by major faults to the north, east and...
Timing of emplacement of the Haypress Creek and Emigrant Gap plutons: Implications for the timing and controls of Jurassic orogenesis, northern Sierra Nevada, California
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
David M. Miller, Cathy Busby, editor(s)
1995, Book chapter, Jurassic magmatism and tectonics of the North American cordillera
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...
The value of postaudits in groundwater model applications
Leonard F. Konikow
1995, Book chapter, Groundwater models for resources analysis and management
No abstract available....
Isotope tracers on water and solute sources in catchments
Carol Kendall, C. Sklash, Thomas D. Bullen
1995, Book chapter, Solute modelling in catchment systems
No abstract available. ...
ENSO events in the northern Gulf of Alaska, and effects on selected marine fisheries
K.M. Bailey, S.A. Macklin, R.K. Reed, R.D. Brodeur, W.J. Ingraham, John F. Piatt, M. Shima, R.C. Francis, P.J. Anderson, T.C. Royer, A. Hollowed, D.A. Somerton, W.S. Wooster
1995, Report
The 1991-93 El Nino-Southern Oscillation (ENSO) event first appeared in the northern Gulf of Alaska in autumn 1991 with warm sea-surface temperatures. In winter 1992, there were pulses of increased sea level and anomalous circulation. El Nino conditions persisted at least through summer 1993. The effects of this ENSO event...
Rift flank segmentation, basin initiation and propagation: a neotectonic example from Lake Baikal
Susan M. Agar, Kim D. Klitgord
1995, Journal of the Geological Society 849-860
New surficial data (field, Landsat TM and topography) define morpho-tectonic domains and rift flank segmentation in the Ol'khon region of the Central Baikal rift. Deformation, drainage and depositional patterns indicate a change in the locus of active extension that may relate to a recent (<l Ma) change in the kinematics...
Morpholoy and stratal geometry of the Anarctic continental shelf: insights from models
Uri S. ten Brink, Christopher Schneider, Aaron H. Johnson
Alan K. Cooper, Peter F. Barker, Giuliano Brancolini, editor(s)
1995, Book chapter, Geology and seismic stratigraphy of the Anarctic margin
No abstract available....
Decadal and annual changes in biogenic opal and carbonate fluxes to the deep Sargasso Sea
W.G. Deuser, T.D. Jickells, Judith A. Commeau
1995, Deep Sea Research Part A, Oceanographic Research Papers (42) 1923-1932
Analyses of samples from a 14-year series of sediment-trap deployments in the deep Sargasso Sea reveal a significant trend in the ratio of the sinking fluxes of biogenic calcium carbonate and silica. Although there are pronounced seasonal cycles for both flux components, the overall opal/CaCO3 ratio changed by 50% from 1978...
Velocities of southern Basin and Range xenoliths: Insights on the nature of lower crustal reflectivity and composition
Thomas E. Parsons, Nikolas I. Christensen, Howard G. Wilshire
1995, Geology (23) 129-132
To reconcile differences between the assessments of crustal composition in the southern Basin and Range province on the basis of seismic refraction and reflection data and lower-crustal xenoliths, we measured velocities of xenoliths from the Cima volcanic field in southern California. Lower-crustal samples...
Landscape characteristics of fragmented shrubsteppe habitats and breeding passerine birds
Steven T. Knick, J.T. Rotenberry
1995, Conservation Biology (9) 1059-1071
We examined the influence of local and landscape-level attributes of fragmented habitats in shrubsteppe habitats on the breeding distributions of Sage (Amphispiza belli) and Brewer's (Spizella breweri) Sparrows, Sage Thrashers (Oreoscoptes montanus), Horned Larks (Eremophila alpestris), and Western Meadowlarks (Sturnella neglecta) in the Snake River Plains of southwestern Idaho. We...
Turtles
Jeffrey E. Lovich
Edward T. LaRoe, Gaye S. Farris, Catherine E. Puckett, Peter D. Doran, Michael J. Mac, editor(s)
1995, Book chapter, Our living resources: A report to the nation on the distribution, abundance, and health of U.S. plants, animals, and ecosystems
Turtles have existed virtually unchanged for the last 200 million years. Unfortunately, some of the same traits that allowed them to survive the ages often predispose them to endangerment. Delayed maturity and low and variable annual reproductive success make turtles unusually susceptible to increased mortality through exploitation and habitat modifications...
Interlaboratory study of a method for determining nonvolatile organic carbon in aquifer materials
M.E. Caughey, M.J. Barcelona, R.M. Powell, R.A. Cahill, C. Gron, D. Lawrenz, P.L. Meschi
1995, Environmental Geology (26) 211-219
The organic carbon fraction in aquifer materials exerts a major influence on the subsurface mobilities of organic and organic-associated contaminants. The spatial distribution of total organic carbon (TOC) in aquifer materials must be determined before the transport of hydrophobic organic pollutants in aquifers can be modeled accurately. Previous interlaboratory studies...
Mountain wetlands: Efficient uranium filters — Potential impacts
Douglass E. Owen, James K. Otton
1995, Ecological Engineering (5) 77-93
Wetlands are common in montane and subalpine settings in the Rocky Mountains, Sierra Nevada, and other mountainous regions of the western U.S. Because they are efficient filters, many contain anomalous concentrations of uranium and other metals. Sorption by organic matter, complexing of the uranyl ion, (UO2) 2+, with humic and...
Physician/chemist/geologist Charles Thomas Jackson's life of conflict and controversy
E. R. Landa
1995, Journal of Geological Education (43) 20-25
After a brief medical career, Charles Thomas Jackson (1805–1880) began work as a consulting chemist and geologist in Boston. He served as State Geologist in Maine, Rhode Island, and New Hampshire from 1837 to 1844, and completed geologica l surveys of those States. In 1847, he was appointed United States...
Effect of lake-wide planktivory by the pelagic prey fish community in Lakes Michigan and Ontario
Peter S. Rand, Donald J. Stewart, Brian F. Lantry, Lars G. Rudstam, Ora E. Johannsson, Andrew P. Goyke, Stephen B. Brandt, Robert O’Gorman, Gary W. Eck
1995, Canadian Journal of Fisheries and Aquatic Sciences (52) 1546-1563
We compared predatory demand by pelagic planktivorous prey fish with invertebrate production in Lake Michigan during 1987 and in Lake Ontario during 1990. Predation by the planktivores in Lake Ontario was nearly fourfold higher than in Lake Michigan (approx. 87 g wet weight∙m−2∙year−1). Predation rates on Mysis were comparable in Lakes Michigan and...
Viewpoints and practices - numerical modeling of 3-D estuarine hydrodynamics
Ralph T. Cheng
1995, Book chapter, Advances in hydroscience and engineering, V. II, Part B
No abstract available....
Channel degradation in southeastern Nebraska Rivers
Kenneth L. Wahl, Linda S. Weiss
Ward Rim J., editor(s)
1995, Conference Paper, Watershed Management Symposium - Proceedings
Many stream channels in southeastern Nebraska were dredged and straightened during 1904-15. The resulting channels were both shorter and steeper than the original channels. Tests for time trends were conducted using the nonparametric Kendall tau test to see if the channels have responded to these changes. Tests were conducted on...
Origins, characteristics, controls, and economic viabilities of deep- basin gas resources
L.C. Price
1995, Chemical Geology (126) 335-349
Dry-gas deposits (methane ???95% of the hydrocarbon (HC) gases) are thought to originate from in-reservoir thermal cracking of oil and C2+ HC gases to methane. However, because methanes from Anadarko Basin dry-gas deposits do not carry the isotopic signature characteristics of C15+ HC destruction, an origin of these methanes from...
Strong-acid, carboxyl-group structures in fulvic acid from the Suwannee River, Georgia. 1. Minor structures
J.A. Leenheer, R.L. Wershaw, M.M. Reddy
1995, Environmental Science & Technology (29) 393-398
An investigation of the strong-acid characteristics (pKa 3.0 or less) of fulvic acid from the Suwannee River, Georgia, was conducted. Quantitative determinations were made for amino acid and sulfur-containing acid structures, oxalate half-ester structures, malonic acid structures, keto acid structures, and aromatic carboxyl-group structures. These determinations were made by using...
Effects of empirical versus model-based reflectance calibration on automated analysis of imaging spectrometer data: a case study from the Drum Mountains, Utah
John L. Dwyer, Fred A. Kruse, Adam B. Lefkoff
1995, Photogrammetric Engineering and Remote Sensing (61) 1247-1254
Data collected by the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) have been calibrated to surface reflectance using an empirical method and an atmospheric model-based method. Single spectra extracted from both calibrated data sets for locations with known mineralogy compared favorably with laboratory and field spectral measurements of samples from the same...
