Biomagnification of bioassay derived 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents
P. D. Jones, G.T. Ankley, D. A. Best, R. Crawford, N. DeGalan, J. P. Giesy, T.J. Kubiak, J. P. Ludwig, J.L. Newsted, D. E. Tillitt, D. A. Verbrugge
1993, Chemosphere (26) 1203-1212
In recent years contamination of the Great Lakes ecosystem with planar chlorinated hydrocarbons (PCHs) has attracted considerable concern due to their known reproductive and teratogenic effects. The H4IIE bioassay has been standardized as a means of measuring the biological potency of a PCH mixture as 2,3,7,8-tetrachloro-p-dibenzodioxin equivalents (TCDD-EQ). Using this...
Early and Late Cretaceous vol canism and reef-building in the Marshall Islands
J. M. Lincoln, M. S. Pringle, Isabella Premolia Silva
1993, Book chapter, The Mesozoic Pacific: Geology, tectonics, and volcanism
No abstract available ...
Instrumental shaking thresholds for seismically induced landslides and preliminary report on landslides triggered by the October 17, 1989, Loma Prieta, California earthquake
E. L. Harp
1993, Geografia Fisica e Dinamica Quaternaria (16) 13-15
The generation of seismically induced landslide depends on the characteristics of shaking as well as mechanical properties of geologic materials. A very important parameter in the study of seismically induced landslide is the intensity based on a strong-motion accelerogram: it is defined as Arias intensity and is proportional to the...
Taming a wild geothermal research well in yellowstone national park
Robert O. Fournier, Larry M. Pisto, Bruce B. Howell, Roderick A. Hutchnson
Anon, editor(s)
1993, Conference Paper, Transactions - Geothermal Resources Council
In November 1992 the valve at the top of a U.S. Geological Survey drill hole in Yellowstone National Park parted from the casting as a result of corrosion. This allowed uncontrolled venting of boiling water and steam from the well at an estimated liquid flow rate of about 25-50 gallons...
Thortveitite and associated Sc-bearing minerals from Ravalli County, Montana
E.E. Foord, S.D. Birmingham, F. Demartin, T. Pilati, C.M. Gramaccioli, F.E. Lichte
1993, Canadian Mineralogist (31) 337-346
The rare Sc mineral thortveitite, (Sc,Y)2Si2O7, occurs as ??m- to mm-sized crystals in fluorite-bearing granitic pegmatites and the host melagabbro within the Crystal Mountain fluorite deposit, Ravalli County, Montana. Thortveitite is found as colorless and clear to smoky and translucent, subhedral to euhedral prisms up to 3 mm in length...
Crude oil in a shallow sand and gravel aquifer-III. Biogeochemical reactions and mass balance modeling in anoxic groundwater
M.J. Baedecker, I.M. Cozzarelli, R.P. Eganhouse, D. I. Siegel, P.C. Bennett
1993, Applied Geochemistry (8) 569-586
Crude oil floating on the water table in a sand and gravel aquifer provides a constant source of hydrocarbons to the groundwater at a site near Bemidji, Minnesota. The degradation of hydrocarbons affects the concentrations of oxidized and reduced aqueous species in the anoxic part of the contaminant plume that...
Geological and technological assessment of artificial reef sites, Louisiana outer continental shelf
D.L. Pope, T.F. Moslow, J.B. Wagner
1993, Ocean and Coastal Management (20) 121-145
This paper describes the general procedures used to select sites for obsolete oil and gas platforms as artificial reefs on the Louisiana outer continental shelf (OCS). The methods employed incorporate six basic steps designed to resolve multiple-use conflicts that might otherwise arise with daily industry and commercial fishery operations, and...
Petrology and U-Pb geochronology of buried Avalonian plutonic rocks on southeastern Cape Cod
G. W. Leo, J.K. Mortensen, B. Barreiro, J. D. Phillips
1993, Atlantic Geology (29) 103-113
Plutonic rocks have been intersected by two separate drill holes on southeastern Cape Cod. Hole CC2 is located at Chatham Harbor about 7 km south of the Nauset anomaly, an east-northeast-trending magnetic lineament that was considered to separate the distinct plutonic zones of Avalon terrane. This drill hole intersected weakly...
Vegetation establishment and channel narrowing along a Great Plains stream following a catastrophic flood
J.M. Friedman
1993, Thesis
No abstract available....
Borehole techniques identifying subsurface chimney heights in loose ground-some experiences above underground nuclear explosions
R. D. Carroll, J.W. Lacomb
1993, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (30) 575-590
The location of the subsurface top of the chimney formed by the collapse of the cavity resulting from an underground nuclear explosion is examined at five sites at the Nevada Test Site. The chimneys were investigated by drilling, coring, geophysical logging (density, gamma-ray, caliper), and seismic velocity surveys. The identification...
Reproduction of an exotic riparian tree willow, Salix fragilis (L.), in Colorado
P.B. Shafroth, M. L. Scott, Jonathan M. Friedman, R. D. Laven
M. C. Landin, editor(s)
1993, Conference Paper, Wetlands: Proceedings of the Thirteenth Annual Conference of the Society of Wetland Scientists
No abstract available....
Relation of channel stability to scour at highway bridges over waterways in Maryland
Edward J. Doheny
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Data from assessments of channel stability and observed-scour conditions at 876 highway bridges over Maryland waterways were entered into a database. Relations were found to exist among specific, deterministic variables and observed-scour and debris conditions. Relations were investigated between (1) high-flow angle of attack and pier- and abutment-footing exposure, (2)abutment...
Modeling the tides of Massachusetts and Cape Cod Bays
H. L. Jenter, R. P. Signell, A.F. Blumberg
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A time-dependent, three-dimensional numerical modeling study of the tides of Massachusetts and Cape Code Bays, motivated by construction of a new sewage treatment plant and ocean outfall for the city of Boston, has been undertaken by the authors. The numerical model being used is a hybrid version of the Blumberg...
Directions of the US Geological Survey Landslide Hazards Reduction Program
G. F. Wieczorek
1993, Geografia Fisica e Dinamica Quaternaria (16) 21-25
The US Geological Survey (USGS) Landslide Hazards Reduction Program includes studies of landslide process and prediction, landslide susceptibility and risk mapping, landslide recurrence and slope evolution, and research application and technology transfer. Studies of landslide processes have been recently conducted in Virginia, Utah, California, Alaska, and Hawaii, Landslide susceptibility maps...
Courant number and unsteady flow computation
Chintu Lai
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
The Courant number C, the key to unsteady flow computation, is a ratio of physical wave velocity, ??, to computational signal-transmission velocity, ??, i.e., C = ??/??. In this way, it uniquely relates a physical quantity to a mathematical quantity. Because most unsteady open-channel flows are describable by a set...
Nonpoint source contamination of the Mississippi river and its tributaries by herbicides
W. E. Pereira, F. D. Hostettler
1993, Environmental Science & Technology (27) 1542-1552
A study of the Mississippi River and its tributaries during July-August 1991, October-November 1991, and April-May 1992 has indicated that the entire navigable reach of the river is contaminated with a complex mixture of agrochemicals and their transformation products derived from nonpoint sources. Twenty-three compounds were identified, including triazine, chloroacetanilide,...
The pyramid system for multiscale raster analysis
L. De Cola, N. Montagne
1993, Computers & Geosciences (19) 1393-1404
Geographical research requires the management and analysis of spatial data at multiple scales. As part of the U.S. Geological Survey's global change research program a software system has been developed that reads raster data (such as an image or digital elevation model) and produces a pyramid of aggregated lattices as...
Pressure increases, the formation of chromite seams, and the development of the ultramafic series in the Stillwater Complex, Montana
Bruce R. Lipin
1993, Journal of Petrology (34) 955-976
This paper explores the hypothesis that chromite seams in the Stillwater Complex formed in response to periodic increases in total pressure in the chamber. Total pressure increased because of the positive δV of nucleation of CO2 bubbles in the melt and their subsequent rise through the magma chamber, during which...
Development of a model of phytoplankton blooms in Manukau Harbour
Graham B. McBride, W. N. Vant, J. E. Cloern, J. B. Liley
1993, Report
No abstract available....
Regional flow in the Baltic Shield during Holocene coastal regression
Clifford I. Voss, Johan Andersson
1993, Groundwater (31) 989-1006
The occurrence of saline waters in the Baltic Shield in Sweden is consistent with ongoing but incomplete Holocene flushing and depends on the geometry and connectivity of conductive structures at both regional and local scales, and on the surface topography. Numerical simulation of regional...
Calculation of multicomponent chemical equilibria in gas-solid-liquid systems: Calculation methods, thermochemical data, and applications to studies of high-temperature volcanic gases with examples from Mount St. Helens
Robert B. Symonds, Mark H. Reed
1993, American Journal of Science (293) 758-864
No abstract available....
Culvert analysis program for indirect measurement of discharge
Janice M. Fulford
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A program based on the U.S. Geological Survey (USGS) methods for indirectly computing peak discharges through culverts allows users to employ input data formats used by the water surface profile program (WSPRO). The program can be used to compute discharge rating surfaces or curves that describe the behavior of flow...
Climatic impact on isovolumetric weathering of a coarse-grained schist in the northern Piedmont Province of the central Atlantic states
E.T. Cleaves
1993, Geomorphology (8) 191-198
The possible impact of periglacial climates on the rate of chemical weathering of a coarse-grained plagioclase-muscovite-quartz schist has been determined for a small watershed near Baltimore, Maryland. The isovolumetric chemical weathering model formulated from the geochemical mass balance study of the watershed...
An algal carbon budget for pelagic-benthic coupling in Lake Michigan
S.A. Fitzgerald, W.S. Gardner
1993, Limnology and Oceanography (38) 547-560
Assimilation and respiration rates of Diporeia sp., an abundant benthic amphipod, and of sediment microheterotrophs were measured in a microcosm study. Release of radioisotope in the form of dissolved organic compounds was much lower than that incorporated and respired for both Diporeia and sediment bacteria. Of the 61 mmol C...
Analysis of the ovarian cycle in black-footed ferrets (Mustela nigripes) by vaginal cytology and fecal hormone measurement
T. S. Gross, C. Wieser, M. Patton
1993, Biology of Reproduction (45) 647-656
Abstract not supplied at this time...
