The influence of land cover and temperature change on hydrological and ecosystem dynamics in the South Platte River Basin
Jill Baron, D. S. Ojima, M.D. Hartman, Timothy G.F. Kittel, R.B. Lammers, L.E. Band, R. A. Pielke
1997, Conference Paper, Proceedings of the AWRA Annual Symposium, Water Resources Education, Training, and Practice: Opportunities for the Next Century
No abstract available....
Use of 234U and 238U isotopes to evaluate contamination of near-surface groundwater with uranium-mill effluent: A case study in south-central Colorado, U.S.A.
R. A. Zielinski, D. T. Chafin, E. R. Banta, Barney J. Szabo
1997, Environmental Geology (32) 124-136
The 234U/238U alpha activity ratio (AR) was determined in 47 samples of variably uraniferous groundwater from the vicinity of a uranium mill near Canon City, Colorado. The results illustrate that uranium isotopes can be used to determine the distribution of uranium contamination in groundwater and to indicate processes such as...
Selenium trends in north San Francisco Bay
S. N. Luoma, R. Linville
1997, Interagency Ecological Program Newsletter (10) 25-26
No abstract available....
Kinetics of DCE and VC mineralization under methanogenic and Fe(III)- reducing conditions
P. M. Bradley, F. H. Chapelle
1997, Environmental Science & Technology (31) 2692-2696
The kinetics of anaerobic mineralization of DCE and VC under methanogenic and Fe(III)-reducing conditions as a function of dissolved contaminant concentration were evaluated. Microorganisms indigenous to creek bed sedi ments, where groundwater contaminated with chlorinated ethenes continuously discharges, demonstrated significant mineralization of DCE and VC under methanogenic...
Response characteristics of DOC flushing in an alpine catchment
E.W. Boyer, G.M. Hornberger, K.E. Bencala, Diane M. McKnight
1997, Hydrological Processes (11) 1635-1647
The spatial distribution of source areas and associated residence times of water in the catchment are significant factors controlling the annual cycles of dissolved organic carbon (DOC) concentration in Deer Creek (Summit County, Colorado). During spring snowmelt (April-August 1992), stream DOC concentrations increased with the rising limb of the hydrograph,...
Stream bed temperature profiles as indicators of percolation characteristics beneath arroyos in the middle Rio Grande Basin, USA
J. Constantz, C. L. Thomas
1997, Hydrological Processes (11) 1621-1634
Stream bed temperature profiles were monitored continuously during water year 1990 and 1991 (WY90 and 91) in two New Mexico arroyos, similar in their meteorological features and dissimilar in their hydrological features. Stream bed temperature profiles between depths of 30 and 300 cm were examined to determine whether temporal changes...
Hydrological and chemical estimates of the water balance of a closed-basin lake in north central Minnesota
James W. LaBaugh, Thomas C. Winter, Donald O. Rosenberry, Paul F. Schuster, Michael M. Reddy, George R. Aiken
1997, Water Resources Research (33) 2799-2812
Chemical mass balances for sodium, magnesium, chloride, dissolved organic carbon, and oxygen 18 were used to estimate groundwater seepage to and from Williams Lake, Minnesota, over a 15-month period, from April 1991 through June 1992. Groundwater seepage to the lake and seepage from the lake to groundwater were determined independently...
Status, trends, and changes in freshwater inflows to bay systems in the Corpus Christi Bay National Estuary Program study area
W.H. Asquith, J. G. Mosier, P. W. Bush
1997, Report
This report presents the results of a study to quantify current (1983–93) mean freshwater inflows to the six bay systems (open water and wetlands) in the Corpus Christi Bay National Estuary Program study area, to test for historical temporal trends in inflows, and to quantify historical and projected changes in...
Effects of reduced wastewater phosphate concentrations in South San Francisco Bay
S.W. Hager, L. E. Schemel
1997, Interagency Ecological Program Newsletter (10) 11-12
No abstract available....
Using conditional simulations of the level of Devils Lake, North Dakota, to reconstruct historical hydrologic conditions
Aldo V. Vecchia, Gregg J. Wiche
1997, Proceedings of the North Dakota Academy of Science (51) 40-44
No abstract available....
Combined-sewer overflow data and methods of sample collection for selected sites, Detroit, Michigan
M.J. Sweat, J.R. Wolf
1997, Open-File Report 96-646
The discharge of untreated sewage is illegal in Michigan unless permitted under Act 245 due to public health concerns. In October, 1992, the Michigan Department of Natural Resources (MDNR, now the Michigan Department of Environmental Quality) issued a discharge permit to Detroit authorizing discharge from the City's 78 combined-sewer overflows...
Advances in ice radar studies of a temperate alpine glacier, South Cascade Glacier, Washington, U.S.A.
A. G. Fountain, R.W. Jacobel
1997, Annals of Glaciology (24) 303-308
South Cascade Glacier, Washington, U.S.A., is one of the most extensively studied glaciers in the Western Hemisphere. In addition to mass-balance measurements, which date to 1958, numerous hydrological investigations have been carried out during the last three decades, and repeated ice-thickness determinations have been made using a variety of techniques....
Temporal variability in the hydrologic regimes of the United States
E. F. Hubbard, J.M. Landwehr, A.R. Barker
1997, IAHS-AISH Publication (246) 97-103
Discharge records where flows have not been subject to overt anthropogenic controls have been identified for over 1500 streamflow gauging stations throughout the United States in the US Geological Survey Hydro-Climatic Data Network. These stations fall within all 21 water resources regions of the United States. Analysis of runoff in...
Analysis of environmental data with censored observations
S. Liu, J.-C. Lu, D.W. Kolpin, W.Q. Meeker
1997, Environmental Science & Technology (31) 3358-3362
The potential threats to humans and to terrestrial and aquatic ecosystems from environmental contamination could depend on the sum of the concentrations of different chemicals. However, direct summation of environmental data is not generally feasible because it is common for some chemical concentrations to be recorded as being below the...
Sources of glacial moisture in Mesoamerica
J.P. Bradbury
1997, Quaternary International (43-44) 97-110
Paleoclimatic records from Mesoamerica document the interplay between Atlantic and Pacific sources of precipitation during the last glacial stage and Holocene. Today, and throughout much of the Holocene, the entire region receives its principal moisture in the summer from an interaction of easterly trade winds with the equatorial calms. Glacial...
An energy-circuit population model for great egrets (Ardea alba) at Lake Okeechobee, Florida, U.S.A
Jeff P. Smith
1997, Ecological Modelling (97) 1-21
I simulated the annual population cycles of Great Egrets (Ardea alba) at Lake Okeechobee, Florida, to provide a framework for evaluating the local population dynamics of nesting and foraging wading birds. The external forcing functions were solar energy, minimum air temperature, water depth, surface-water drying rate, and season. Solar input...
Nesting season food habits of 4 species of herons and egrets at Lake Okeechobee, Florida
Jeff P. Smith
1997, Colonial Waterbirds (20) 198-220
Based on the composition of nestling regurgitations collected during 3 breeding seasons, fish were the most important prey group for Great Egrets (Ardea alba: N = 200 nest-day samples; aggregate percent biomass [APB] = 73.4%), Snowy Egrets (Egretta thula: N = 115; APB = 91.4%), and Tricolored Herons (E. tricolor:...
Vertical accretion and shallow subsidence in a mangrove forest of southwestern Florida, U.S.A
Donald R. Cahoon, J.C. Lynch
1997, Mangroves and Salt Marshes (1) 173-186
Simultaneous measurements of vertical accretion from artificial soil marker horizons and soil elevation change from sedimentation-erosion table (SET) plots were used to evaluate the processes related to soil building in range, basin, and overwash mangrove forests located in a low-energy lagoon which recieves minor inputs of terregenous sediments. Vertical accretion...
Iron deposition as acidic groundwater encounters carbonates in the alluvium of Pinal Creek, Arizona, U.S.A.
Carol J. Lind, R.L. Oscarson
1997, Applied Geochemistry (12) 83-95
In a column experiment, acidic groundwater from Pinal Creek Arizona, a Cu mining area, was eluted through a composited alluvial sample obtained from a core that had been removed from a well downgradient of the acidic groundwater. The minerals present in typical grains and flakes in the alluvium before and...
Assessing hydrogeochemical heterogeneity in natural and constructed wetlands
R. J. Hunt, D. P. Krabbenhoft, Marilyn P. Anderson
1997, Biogeochemistry (39) 271-293
While 'water quality function' is cited as an important wetland function to design for and preserve, we demonstrate that the scale at which hydrochemical samples are collected can significantly influence interpretations of biogeochemical processes in wetlands. Subsurface, chemical profiles for both nutrients and major ions were determined at a site...
Stable isotope evidence for an atmospheric origin of desert nitrate deposits in northern Chile and southern California, U.S.A.
J.K. Böhlke, G. E. Ericksen, K. Revesz
1997, Chemical Geology (136) 135-152
Natural surficial accumulations of nitrate-rich salts in the Atacama Desert, northern Chile, and in the Death Valley region of the Mojave Desert, southern California, are well known, but despite many geologic and geochemical studies, the origins of the nitrates have remained controversial. N...
Protistan communities in aquifers: A review
G. Novarino, A. Warren, H. Butler, G. Lambourne, A. Boxshall, J. Bateman, N.E. Kinner, R.W. Harvey, R.A. Mosse, B. Teltsch
1997, FEMS Microbiology Reviews (20) 261-275
Eukaryotic microorganisms (protists) are a very important component of microbial communities inhabiting groundwater aquifers This is not unexpected when one considers that many protists feed heterotrophically, by means of either phagotrophy (bacterivory) or osmotrophy. Protistan numbers are usually low (<102 per g dw of aquifer material) in pristine, uncontaminated aquifers...
Bacterial oxidation of methyl bromide in Mono Lake, California
T.L. Connell, S.B. Joye, L.G. Miller, R.S. Oremland
1997, Environmental Science & Technology (31) 1489-1495
The oxidation of methyl bromide (MeBr) in the water column of Mono Lake, CA, was studied by measuring the formation of H14CO3 from [14C]MeBr. Potential oxidation was detected throughout the water column, with highest rates occurring in the epilimnion (5-12 m depth). The oxidation of MeBr was eliminated by filter-sterilization,...
Hydrologic investigations in the Mammoth Corridor, Yellowstone National Park and vicinity, U.S.A.
M.L. Sorey, E.M. Colvard
1997, Geothermics (26) 221-249
The Mammoth Corridor in and adjacent to Yellowstone National Park encompasses a N-S alignment of geothermal features that extends from the Norris Geyser Basin adjacent to the Yellowstone caldera through Mammoth Hot Springs to the Corwin Springs Known Geothermal Resources Area (KGRA). Thermal springs in this region discharge water that...
Hydrologic indices for nontidal wetlands
Robert M. Lent, Peter K. Weiskel, Forest P. Lyford, David S. Armstrong
1997, Wetlands (17) 19-30
Two sets of hydrologic indices were developed to characterize the water-budget components of nontidal wetlands. The first set consisted of six water-budget indices for input and output variables, and the second set consisted of two hydrologic interaction indices derived from the water-budget indices. The indices then were applied to 19...
