Quality assurance and quality control in monitoring programs
W. J. Shampine
1993, Conference Paper, Environmental Monitoring and Assessment
There are three general characteristics of the data to be collected in a monitoring program that should be met in order to maximize the use and value of the data: the data quality should be known the data type and quality should be consistent and comparable, and the data should...
The Crisis over the 1988 National Oil and Gas Assessment for the United States - A story about the conflict among high government officials, a special interest group, and government geologists
J. Lawrence
1993, Nonrenewable Resources (2) 3-13
[No abstract available]...
A note on subtrees rooted along the primary path of a binary tree
Brent M. Troutman, Michael R. Karlinger
1993, Discrete Applied Mathematics (42) 87-93
Let Fn denote the set of rooted binary plane trees with n external nodes, for given T∈Fn let ui(T) be the altitude i node along the primary path of T, and let δi(T) denote the number of external nodes in the induced subtree rooted at ui(T). We set δi(T) = 0 if i is greater than the length of the primary path of T. We prove...
Significant bed elevation changes related to Gulf Stream dynamics on the South Carolina continental shelf
G. Gelfenbaum, M. Noble
1993, Continental Shelf Research (13) 385-405
Photographs of the seabed taken from an instrumented bottom tripod located approximately 100 km east of Charleston, South Carolina, reveal bed elevation changes of over 20 cm between July and November 1978. The tripod was in 85 m of water and was equipped with two current meters at 38.7 and...
Biological interference of optical backscatterance sensors in Tampa Bay, Florida
D. H. Schoellhamer
1993, Marine Geology (110) 303-313
Optical backscatterance (OBS, D&A Instruments, Inc.1) sensors for measuring suspended-solids concentrations have been deployed in Tampa Bay to monitor resuspension of bottom sediments. This paper describes biological factors that affected the OBS sensors deployed in Tampa Bay and discusses...
Bacterial degradation of acetone in an outdoor model stream
R. E. Rathbun, D. W. Stephens, D. Y. Tai
1993, Environmental Pollution (79) 153-162
Diurnal variations of the acetone concentration in an outdoor model stream were measured with and without a nitrate supplement to determine if the nitrate supplement would stimulate bacterial degradation of the acetone. Acetone loss coefficients were computed from the diurnal data using a fitting procedure based on a Lagrangian particle...
Roosevelt elk selection of temperate rain forest seral stages in western Washington
Greg L. Schroer, Kurt J. Jenkins, Bruce B. Moorhead
1993, Northwest Science (67) 23-29
We studied habitat selection by Roosevelt elk (Cervus elaphus roosevelti) in a temperate rain forest in the lower Queets River Valley of the western Olympic Peninsula, Washington from June 1986-July 1987. Elk annual home ranges included predominantly unlogged forests protected within Olympic National Park and logged, regenerating forests adjacent to...
An objective replacement method for censored geochemical data
R.F. Sanford, C. T. Pierson, R. A. Crovelli
1993, Mathematical Geology (25) 59-80
Geochemical data are commonly censored, that is, concentrations for some samples are reported as "less than" or "greater than" some value. Censored data hampers statistical analysis because certain computational techniques used in statistical analysis require a complete set of uncensored data. We show that the simple substitution method for creating...
Surface chemistry of ferrihydrite: Part 2. Kinetics of arsenate adsorption and coprecipitation
C. C. Fuller, J.A. Dadis, G.A. Waychunas
1993, Geochimica et Cosmochimica Acta (57) 2271-2282
The kinetics of As(V) adsorption by ferrihydrite was investigated in coprecipitation and postsynthesis adsorption experiments conducted in the pH range 7.5-9.0. In coprecipitation experiments, As(V) was present in solution during the hydrolysis and precipitation of iron. In adsorption experiments, a period of rapid (<5 min) As(V) uptake from solution was...
Effects of small-scale vertical variations in well-screen inflow rates and concentrations of organic compounds on the collection of representative ground-water-quality samples
Jacob Gibs, G. Allan Brown, Kenneth S. Turner, Cecilia L. MacLeod, James Jelinski, Susan A. Koehnlein
1993, Ground Water (31) 201-208
Because a water sample collected from a well is an integration of water from different depths along the well screen, measured concentrations can be biased if analyte concentrations are not uniform along the length of the well screen. The resulting concentration in the sample, therefore, is a function of variations...
Selected precipitation characteristics in Antelope Valley, Mojave Desert, CA
James C. Blodgett, Iraj Nasseri
1993, Conference Paper, Proceedings of the Symposium on Engineering Hydrology
An urban hydrology study currently in progress in Antelope Valley, California, includes the collection and analyses of precipitation and runoff data. Storms in Antelope Valley are most prevalent during the months of December, January, February, and March, but major storms have occurred during all months of the year except April,...
South Platte River Basin - Colorado, Nebraska, and Wyoming
Kevin F. Dennehy, David W. Litke, Cathy M. Tate, Janet S. Heiny
1993, Water Resources Bulletin (29) 647-683
The South Platte River Basin was one of 20 study units selected in 1991 for investigation under the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) program. One of the initial tasks undertaken by the study unit team was to review the environmental setting of the basin and assemble ancillary data...
Holocene sedimentation and coastal wetlands response to rising sea level at the Aucilla river mouth, a low energy coast in the Big Bend area of Florida
Connie Garrett, Heidi Hertler, Ronald Hoenstine, Brad Highley
1993, Conference Paper, Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management
The shallow dip of the Florida carbonate platform results in low wave energy on Florida ???Big Bend??? coasts. Therefore sedimentation is dominated by river-and tidal-hydrodynamics near the Aucilla River mouth. Where present, Holocene sediments are thin and unconformably overlie Oligocene-aged Suwannee Limestone. The oldest unlithified sediments include reworked carbonate rubble...
Nitrogen isotopes as indicators of nitrate sources in Minnesota sand-plain aquifers
Stephen C. Komor, Henry W. Anderson Jr.
1993, Ground Water (31) 260-270
Nitrate concentrations in excess of national drinking-water standards (10 mg/1 as N) are present in certain sand-plain aquifers in central Minnesota. To investigate nitrate sources in the aquifers, nitrogen-isotope values of nitrate (δ15NNO3No3) were measured in shallow ground water from 51 wells in five land-use settings. The land-use settings and...
A procedure for partitioning bulk sediments into distinct grain-size fractions for geochemical analysis
A. Barbanti, Michael H. Bothner
1993, Environmental Geology (21) 3-13
A method to separate sediments into discrete size fractions for geochemical analysis has been tested. The procedures were chosen to minimize the destruction or formation of aggregates and involved gentle sieving and settling of wet samples. Freeze-drying and sonication pretreatments, known to influence aggregates, were used for comparison. Freeze-drying was...
Concentration history during pumping from a leaky aquifer with stratified initial concentration
Daniel J. Goode, Paul A. Hsieh, Allen M. Shapiro, Warren W. Wood, Thomas F. Kraemer
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Analytical and numerical solutions are employed to examine the concentration history of a dissolved substance in water pumped from a leaky aquifer. Many aquifer systems are characterized by stratification, for example, a sandy layer overlain by a clay layer. To obtain information about separate hydrogeologic units, aquifer pumping tests are...
Interaction of rising frazil with suspended particles: Tank experiments with applications to nature
E. Reimnitz, J. R. Clayton, E. W. Kempema, J. R. Payne, W. S. Weber
1993, Cold Regions Science and Technology (21) 117-135
Widespread occurrence of sediment-laden (turbid) sea ice and high concentrations of diatoms and foraminifers in ice have recently been reported from both polar regions. Many possible mechanisms of particle entrainment into ice have been postulated, among which scavenging by rising frazil ice and nucleation or adhesion of ice onto suspended...
40Ar-39Ar ages of bentonite beds in the upper part of the Yazoo Formation (Upper Eocene), west-central Mississippi
J. D. Obradovich, D. T. Dockery III, C. C. Swisher III
1993, Mississippi Geology (14) 1-9
Bentonite beds recorded from both outcrops and cores in the upper Eocene Yazoo Formation offer opportunities to date the uppermost Eocene of this region and to provide information on the age of the Eocene/Oligocene boundary. This report gives radiometric age dates for three bentonites sampled from the upper Yazoo Formation....
Geophysical investigations of buried volcanic centers near Yucca Mountain, Southwest Nevada
V.E. Langenheim, K. S. Kirchoff-Stein, H. W. Oliver
1993, Conference Paper, High Level Radioactive Waste Management
Several aeromagnetic dipolar anomalies occur over flat, alluvial areas near Yucca Mountain that resemble anomalies typically associated with subaerial basaltic volcanic centers. Detailed gravity and ground magnetic data were collected along a surveyed traverse across an aeromagnetic anomaly in Amargosa Valley, south of Yucca Mountain, Nevada. Modeling of the ground...
The Solubility and Stabilization of Ikaite (CaCO3·6H2O) from 0° to 25°C: Environmental and Paleoclimatic Implications for Thinolite Tufa
James L. Bischoff, John A. Fitzpatrick, Robert J. Rosenbauer
1993, Journal of Geology (101) 21-33
We determined the solubility of ikaite from 0° to 25°C to model its saturation state in natural waters and test the hypothesis that it is the precursor of the calcite pseudomorphs in thinolite tufa of Quaternary Lake Lahontan. Reversible solubility at buffered...
Shark viruses
P. E. McAllister
M. K. Stoskopf, editor(s)
1993, Book chapter, Fish medicine
No abstract available at this time...
Hydrothermal studies in a new diamond anvil cell up to 10 GPa and from -190°C to 1200°C
William A. Bassett, A.H. Shen, M. Bucknum, I.-M. Chou
1993, Pure and Applied Geophysics PAGEOPH (141) 487-495
The new hydrothermal diamond anvil cell (HDAC) has been designed for optical microscopy and X-ray diffraction at pressures up to 10 GPa and temperatures between −190°C and 1200°C. Laser light reffected from the top and bottom anvil faces and the top and bottom solid sample faces produce...
Supply of large woody debris in a stream channel
Timothy H. Diehl, Bradley A. Bryan
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
The amount of large woody debris that potentially could be transported to bridge sites was assessed in the basin of the West Harpeth River in Tennessee in the fall of 1992. The assessment was based on inspections of study sites at 12 bridges and examination of channel reaches between bridges....
Freshwater tropical fish viruses
P. E. McAllister
M. K. Stoskopf, editor(s)
1993, Book chapter, Fish medicine
No abstract available at this time...
Freshwater temperate fish viruses
P. E. McAllister
M. K. Stoskopf, editor(s)
1993, Book chapter, Fish medicine
No abstract available at this time...
