Chemical reaction path modeling of ore deposition in Mississippi Valley-type Pb-Zn deposits of the Ozark region, US midcontinent
G.S. Plumlee, D. L. Leach, A. H. Hofstra, G. P. Landis, E. L. Rowan, J.G. Viets
1994, Economic Geology (89) 1361-1383
The Ozark region of the U.S. midcontinent is host to a number of Mississippi Valley-type districts, including the world-class Viburnum Trend, Old Lead Belt, and Tri-State districts and the smaller Southeast Missouri barite, Northern Arkansas, and Central Missouri districts. There is increasing evidence that the Ozark Mississippi Valley-type districts formed...
Autotrophic, hydrogen-oxidizing, denitrifying bacteria in groundwater, potential agents for bioremediation of nitrate contamination
Richard L. Smith, M.L. Ceazan, Myron H. Brooks
1994, Applied and Environmental Microbiology (60) 1949-1955
Addition of hydrogen or formate significantly enhanced the rate of consumption of nitrate in slurried core samples obtained from an active zone of denitrification in a nitrate-contaminated sand and gravel aquifer (Cape Cod, Mass.). Hydrogen uptake by the core material was immediate and rapid, with an...
Interactions between groundwater and surface water in a Virginia coastal plain watershed. 2. Acid-base chemistry
A. K. O’Brien, K.N. Eshleman, J.S. Pollard
1994, Hydrological Processes (8) 411-427
A field study of surface water and groundwater interactions during baseflow and stormflow conditions was performed at the Reedy Creek watershed in the Virginia Coastal Plain. Three estimates of the average saturated hydraulic conductivity (Ks) of the unconfined aquifer were in reasonable agreement (ranging from...
Testing and comparison of four ionic tracers to measure stream flow loss by multiple tracer injection
G. W. Zellweger
1994, Hydrological Processes (8) 155-165
The ionic tracers lithium, sodium, chloride and bromide were used to measure flow loss in a small stream (≈︁ 10 ls−1). An injectate containing all four tracers was added continuously at five sites along a 507 m study reach of St Kevin Gulch, Lake County, Colorado to determine which sections...
Coupling of hydrologic transport and chemical reactions in a stream affected by acid mine drainage
B. A. Kimball, R. E. Broshears, K.E. Bencala, Diane M. McKnight
1994, Environmental Science & Technology (28) 2065-2073
Experiments in St. Kevin Gulch, an acid mine drainage stream, examined the coupling of hydrologic transport to chemical reactions affecting metal concentrations. Injection of LiCl as a conservative tracer was used to determine discharge and residence time along a 1497-m reach. Transport of metals downstream from inflows of acidic, metal-rich...
Reduction of nonpoint source contamination of surface water and groundwater by starch encapsulation of herbicides
M. S. Mills, E.M. Thurman
1994, Environmental Science & Technology (28) 73-79
The loss of the preemergent herbicide atrazine in surface runoff from experimental field plots growing corn (Zea mays L.) was significantly reduced using a starchencapsulated formulation versus a conventional powdered formulation. Field edge losses of starch-encapsulated atrazine were described as following a Rayleigh distribution totaling 1.8% of applied herbicide compared...
Formation and transport of deethylatrazine and deisopropylatrazine in surface water
E.M. Thurman, M. T. Meyer, M. S. Mills, L.R. Zimmerman, C. A. Perry, D. A. Goolsby
1994, Environmental Science & Technology (28) 2267-2277
No abstract available. ...
Volume-controlled hydrologic property measurements in triaxial systems
Harold W. Olsen, Arthur T. Willden, Nicholas J. Kiusalaas, Karl R. Nelson, Eileen P. Poeter
1994, Conference Paper, ASTM Special Technical Publication
New capabilities for hydrologic property measurements in triaxial systems include: (1) volume-controlled and simultaneous measurements of hydraulic conductivity and one-dimensional consolidation (or specific storage) of a saturated test specimen; and (2) volume-controlled measurements of hydraulic conductivity, matric potential, and the variation of these properties with the moisture content of an...
Miocene and Pliocene lacustrine and fluvial sequences, Upper Ramparts and Canyon village, Porcupine river, east-central Alaska
T. D. Fouch, L. D. Carter, Michael J. Kunk, C.A.S. Smith, J. M. White
1994, Quaternary International (22-23) 11-29
Cenozoic strata exposed along the Porcupine River between the Upper Ramparts and Canyon Village, Alaska, can be divided into five unconformity-bounded units (sequences) which are: lower and middle Miocene unit A, the white sandy fluvial sequence with peat beds; middle Miocene unit B, the basalt sequence-part B1 is basalt, and...
Relation between largest known flood discharge and elevation in Montana
Charles Parrett, Stephen R. Holnbeck
1994, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Previous studies relating unit discharge to elevation indicated that large floods in the Rocky Mountains may be limited by elevation. However, high-elevation data are sparse in Montana and the indications may not be entirely correct. Based on data at 19 sites in Montana, a strong log-linear relation exists between large-flood...
Effects of polar and nonpolar groups on the solubility of organic compounds in soil organic matter
C. T. Chiou, D. E. Kile
1994, Environmental Science & Technology (28) 1139-1144
Vapor sorption capacities on a high-organic-content peat, a model for soil organic matter (SOM), were determined at room temperature for the following liquids: n-hexane, 1,4-dioxane, nitroethane, acetone, acetonitrile, 1-propanol, ethanol, and methanol. The linear organic vapor sorption is in keeping with the dominance of vapor partition in peat SOM. These...
Herbicide interchange between a stream and the adjacent alluvial aquifer
Wuncheng Wang, P. Squillace
1994, Environmental Science & Technology (28) 2336-2344
Herbicide interchange between a stream and the adjacent alluvial aquifer and quantification of herbicide bank storage during high streamflow were investigated at a research site on the Cedar River flood plain, 10 km southeast of Cedar Rapids, Iowa. During high streamflow in March 1990, alachlor, atrazine, and metolachlor were detected...
Modeling the effects of climate change on water resources - a review
G.H. Leavesley
1994, Climatic Change (28) 159-177
Hydrologic models provide a framework in which to conceptualize and investigate the relationships between climate and water resources. A review of current studies that assess the impacts of climate change using hydrologic models indicates a number of problem areas common to the variety of models applied. These problem areas include...
A pore-pressure diffusion model for estimating landslide-inducing rainfall
M.E. Reid
1994, Journal of Geology (102) 709-717
Many types of landslide movement are induced by large rainstorms, and empirical rainfall intensity/duration thresholds for initiating movement have been determined for various parts of the world. In this paper, I present a simple pressure diffusion model that provides a physically based...
Sorption of chlorobenzenes to cape cod aquifer sediments
L.B. Barber II
1994, Environmental Science & Technology (28) 890-897
Sorption of tetra- and pentachlorobenzene by sediment from a glacial outwash aquifer on Cape Cod, MA, was evaluated. Particle size and mineralogical fractions (separated based on paramagnetic susceptibility) were characterized with respect to sediment organic carbon (SOC), mineralogy, surface area, metal oxide coatings, and spatial variability. SOC increases by a...
The geochemical evolution of low-molecular-weight organic acids derived from the degradation of petroleum contaminants in groundwater
I.M. Cozzarelli, M.J. Baedecker, R.P. Eganhouse, D.F. Goerlitz
1994, Geochimica et Cosmochimica Acta (58) 863-877
The geochemical evolution of low-molecular-weight organic acids in groundwater downgradient from a crude-oil spill near Bemidji, Minnesota, was studied over a five year period (1986–1990). The organic acids are metabolic intermediates of the degradation of components of the crude oil and are structurally...
Use of long-term tritium records from the Colorado River to determine timescales for hydrologic processes associated with irrigation in the Imperial Valley, California
Robert L. Michel, R.A. Schoeder
1994, Applied Geochemistry (9) 387-401
Tritium records were used to study hydrologic processes associated with irrigation and drainage in the Imperial Valley, a 2000-km2 agricultural area in the southeastern California desert. Tritium was analyzed in surface water, ground water, soil-pore water and drain water, and the results were compared to the historical record of tritium in...
Evaluation of the method of collecting suspended sediment from large rivers by discharge-weighted pumping and separation by continuous- flow centrifugation
J. A. Moody, R.H. Meade
1994, Hydrological Processes (8) 513-530
A method for collecting suspended sediment samples has been developed that pumps a discharge-weighted volume of water from fixed depths at four to 40 locations across a river and separates the suspended sediment in the sample using a continuous-flow centrifuge. The efficacy of the method is evaluated by comparing the...
Studies of the Reactivity of the Ferrihydrite Surface by Iron Isotopic Exchange and Mössbauer Spectroscopy
Brigid A. Rea, James A. Davis, Glenn A. Waychunas
1994, Clays and Clay Minerals (42) 23-34
Two-line ferrihydrite is an important adsorbent of many toxics in natural and anthropogenic systems; however, the specific structural sites responsible for the high adsorption capacity are not well understood. A combination of chemical and spectroscopic techniques have been employed in this study to gain further insight into the structural nature...
Comparison of humic substances isolated from peatbog water by sorption on DEAE-cellulose and amberlite XAD-2
J. Hejzlar, B. Szpakowska, R.L. Wershaw
1994, Water Research (28) 1961-1970
Aquatic humic substances (AHS) were isolated from peatbog water by adsorption (1) on diethylaminoethyl cellulose (DEAE-C) and (2) on Amberlite XAD-2 (XAD) to compare yields of the methods and the composition of the isolated AHS. To provide a detailed comparison, the isolates were fractionated using size-exclusion and hydrophobic-interaction chromatography on...
Washington State metals in soils program: Preliminary results
K. C. Ames
1994, Hydrological Science and Technology (10) 15-30
No abstract available....
1:250,000-scale Hydrologic Units of the United States
Peter Steeves, Douglas Nebert
1994, Open-File Report 1994-0236
The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a numberof data layers which were of interest to the USGS. One of these data layers was the Hydrologic Units. The map is based on the Hydrologic Unit Maps published by...
Secondary minerals and acid mine-water chemistry
Charles N. Alpers, D.W Blowes, D. Kirk Nordstrom, J.L. Jambor
D.W Blowes, J.L. Jambor, editor(s)
1994, Mineralogical Association of Canada Short Course Volumes 22
No abstract available....
Lake Michigan's late Quaternary limnological and climate history from ostracode, oxygen isotope, and magnetic susceptibility
Richard M. Forester, Steven M. Colman, Richard L. Reynolds, Loyd D. Keigwin
1994, Journal of Great Lakes Research (20) 93-107
The limnology of Lake Michigan has changed dramatically since the late Pleistocene in response to the expansion and contraction of continental glaciers, to differential isostatic rebound, and to climate change. The lake sediment's stratigraphic trends, magnetic susceptibility, δ18O, and ostracode species abundance ratios provide criteria to identify the lake's response...
Water resources data, Massachusetts and Rhode Island, water year 1993
R.S. Gadoury, R.S. Socolow, G.G. Girouard, L.R. Ramsbey
1994, Water Data Report MA-RI-93-1
Water resources data for the 1993 water year for Massachusetts and Rhode Island consists of records of stage, discharge, and water quality of streams; contents of lakes and reservoirs; and ground-water levels. This report contains discharge records for 77 gaging stations, month end contents of five lakes and reservoirs, water...
