A. Frankel, E. Safak
1998, Geotechnical Special Publication 91-108
[No abstract available]...
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Publication Extents
Not all publications have extents, not all extents are completely accurateJ. Choi, S.M. Hulseapple, M.H. Conklin, J. W. Harvey
1998, Journal of Hydrology (209) 297-310
Pinal Creek, Arizona receives an inflow of ground water with high dissolved inorganic carbon (57-75 mg/l) and low pH (5.8-6.3). There is an observed increase of in-stream pH from approximately 6.0-7.8 over the 3 km downstream of the point of groundwater inflow. We hypothesized that CO2 gas-exchange was the most...
M. C. Larsen, A. J. Torres-Sanchez
1998, Geomorphology (24) 309-331
Landslides are common in sttep mountainous areas of Puerto Rico where mean annual rainfall and the frequency of intense storms are high. Each year, landslides cause extensive damage to property and coccasionally result in loss of life. Average population density is high, 422 people/km2, and is increasing. This increase in...
E.T. Brown, R.F. Stallard, M. C. Larsen, D.L. Bourles, G.M. Raisbeck, F. Yiou
1998, Earth and Planetary Science Letters (160) 723-728
Accurate estimates of watershed denudation absent anthropogenic effects are required to develop strategies for mitigating accelerated physical erosion resulting from human activities, to model global geochemical cycles, and to examine interactions among climate, weathering, and uplift. We present a simple approach to estimate predevelopment denudation rates using in-situ-produced cosmogenic 10Be...
E.R. Long, D.D. MacDonald, J.C. Cubbage, C.G. Ingersoll
1998, Environmental Toxicology and Chemistry (17) 972-974
The relative abilities of sediment concentrations of simultaneously extracted trace metal: acid-volatile sulfide (SEM: AVS) and dry weight-normalized trace metals to correctly predict both toxicity and nontoxicity were compared by analysis of 77 field-collected samples. Relative to the SEM:AVS concentrations, sediment guidelines based upon dry weight-normalized concentrations were equally or...
David A. Stonestrom, A. F. White, K.C. Akstin
1998, Journal of Hydrology (209) 331-345
SiO2 fluxes associated with contemporary solute transport in three deeply weathered granitoid profiles are compared to bulk SiO2 losses that have occurred during regolith development. Climates at the three profiles range from Mediterranean to humid to tropical. Due to shallow impeding alluvial layers at two of the profiles, and seasonally...
J. W. Wiley
1998, Journal of Raptor Research (32) 241-245
Diet data from 20 Burrowing Owl (Athene cunicularia) nests were collected in southwestern Dominican Republic in 1976, 1982, and 1996. Invertebrates (53.3%) comprised the most numerous prey items (N = 396) delivered to nests by adult owls, but vertebrates (46.7%) were much better represented than in other studies of Burrowing...
J.S. Kargel
1998, Science (280) 1211-1212
[No abstract available]...
W.G. Duffy
1998, Canadian Journal of Fisheries and Aquatic Sciences (55) 15-27
I assessed the population dynamics of fathead minnows (Pimephales promelas) in prairie wetlands and developed a bioenergetics model to estimate their production and prey consumption. I sampled populations in four wetlands weekly from late May through June and biweekly during July and August using a Kushlan 1-m2 throw trap. I...
V. Cayol, F.H. Cornet
1998, Geophysical Research Letters (25) 1979-1982
We have investigated the effects of topography on the surface-deformation field of volcanoes. Our study provides limits to the use of classical half-space models. Considering axisymmetrical volcanoes, we show that interpreting ground-surface displacements with half-space models can lead to erroneous estimations of the shape of the...
C. J. N. Wilson, W. Hildreth
1998, Geology (26) 7-10
Hybrid fall deposits in the Bishop Tuff show features common to both archetypal fall and surge deposits. Like normal-fall deposits, they have an overall plane-parallel bedding and flat-lying pumice clasts but also, like surge deposits, they show variable development of cross-bedding, some crystal...
H. Rubin, R. W. Buddemeier
1998, Journal of Contaminant Hydrology (32) 377-402
This paper presents a generalized basic study that addresses practical needs for an understanding of the major mechanisms involved in the mineralization of groundwater in the Great Bend Prairie aquifer in south- central Kansas. This Quaternary alluvial aquifer and associated surface waters are subject to contamination by saltwater, which in...
Claire R. Tiedeman, Daniel J. Goode, Paul A. Hsieh
1998, Groundwater (36) 611-620
A ground water basin is defined as the volume of subsurface through which ground water flows from the water table to a specified discharge location. Delineating the topographically defined surface water basin and extending it vertically downward does not always define the ground water basin. Instead, a ground water basin...
T.D. Bills
1998, Conference Paper, Proceedings of the Controlled Release Society
[No abstract available]...
Robert W. Gale
1998, Environmental Science & Technology (32) 2292-2300
Passive sampling of dissolved hydrophobic contaminants with lipid (triolein)-containing semipermeable membrane devices (SPMDs) has been gaining acceptance for environmental monitoring. Understanding of the accumulation process has employed a simple polymer film-control model of uptake by the polymer-enclosed lipid, while aqueous film control has been only briefly discussed. A more complete...
S. J. Walsh, D. C. Haney, C. M. Timmerman, R.M. Dorazio
1998, Environmental Biology of Fishes (51) 429-444
The robust redhorse, Moxostoma robustum (Teleostei: Catostomidae), is an imperiled sucker native to large rivers of the Atlantic slope of the southeastern United States. Juvenile M. robustum were tested for tolerances to temperature, salinity, pH, and hypoxia in order to evaluate basic early life-history requirements. Static (acute) tests resulted in...
Jerry W. Hupp, Donna G. Robertson
1998, Wildlife Monographs (138) 1-40
Lesser snow geese (Chen caerulescens caerulescens) of the Western Canadian Arctic Population feed intensively for 2-4 weeks on the coastal plain of the Beaufort Sea in Canada and Alaska at the beginning of their autumn migration. Petroleum leasing proposed for the Alaskan portion of the staging area on the Arctic...
J.P. Hurley, S.E. Cowell, M.M. Shafer, P.E. Hughes
1998, Science of the Total Environment (213) 129-137
As a component of a lakewide mass balance study for Lake Michigan, we measured total mercury (Hg(T)) concentrations and fluxes in 11 selected tributaries. Unfiltered Hg(T) concentrations ranged from 0.56 ng l-61 at the Pete Marquette River to 182 ng l-1 at the Fox River. Highest mean Hg(T) concentrations were...
I.-M. Chou, J.G. Blank, A.F. Goncharov, Ho-kwang Mao, R.J. Hemley
1998, Science (281) 809-812
A previously unknown solid phase of H2O has been identified by its peculiar growth patterns, distinct pressure-temperature melting relations, and vibrational Raman spectra. Morphologies of ice crystals and their pressure-temperature melting relations were directly observed in a hydrothermal diamond-anvil cell for H2O bulk densities between 1203 and 1257 kilograms per...
T. Scherbatskoy, J. B. Shanley, G.J. Keeler
1998, Water, Air, & Soil Pollution (105) 427-438
Total mercury (Hg) deposition and input/output relationships were investigated in an 11-ha deciduous forested catchment in northern Vermont as part of ongoing evaluations of rig cycling and transport in the Lake Champlain basin. Atmospheric Hg deposition (precipitation + modeled vapor phase downward flux) was 425 mg ha-1 during the one-year...
D. A. Nimick
1998, Groundwater (36) 743-753
Arsenic concentrations in ground water of the lower Madison River valley, Montana, are high (16 to 176 μg/L). Previous studies hypothesized that arsenic-rich river water, applied as irrigation, was evapoconcentrated during recharge and contaminated the thin alluvial aquifer. Based on additional data collection and a...
Vladimir Sucha, F. Elsass, D. D. Eberl, L’. Kuchta, J. Madejova, W.P. Gates, P. Komadel
1998, American Mineralogist (83) 58-67
Synthetic gel and glass of illitic composition, natural kaolinite, and mixed-layer illite-smectite were used as starting materials for hydrothermal synthesis of ammonium illite. Ammonium illite was prepared from synthetic gel by hydrothermal treatment at 300??C. The onset of crystallization began within 3 h, and well-crystallized ammonium illite appeared at 24...
J. P. Xu, L.D. Wright
1998, Journal of Coastal Research (14) 610-619
Wind, wave and currents measurements at 9 and 14 meter water depths on the shoreface off U.S. Army Corps of Engineers Field Research Facility at Duck, North Carolina are presented. Coastal setup accompanied by southerly-setting alongshore currents and seaward cross-shore currents is developed during Northeasterly storms. Coastal setdown, with reversal...
K. Kannan, R.G. Smith Jr., R.F. Lee, H.L. Windom, P.T. Heitmuller, J.M. Macauley, J.K. Summers
1998, Archives of Environmental Contamination and Toxicology (34) 109-118
Concentrations of total mercury and methyl mercury were determined in sediment and fish collected from estuarine waters of Florida to understand their distribution and partitioning. Total mercury concentrations in sediments ranged from 1 to 219 ng/g dry wt. Methyl mercury accounted for, on average, 0.77% of total mercury in sediment....
C.T. Johnston, P.G. Cook, S.K. Frape, Niel Plummer, Eurybiades Busenberg, R.J. Blackport
1998, Groundwater (36) 171-180
The impact on ground water quality from increasing fertilizer application rates over the past 40 years is evaluated within a glacial aquifer system beneath a thick unsaturated zone. Ground water ages within the aquifer could not be accurately determined from the measured distribution of 3H and as a result, chlorofluorocarbon (CFC)...