Preliminary analysis of the hydrologic and geochemical controls on acid‐neutralizing capacity in two acidic seepage lakes in Florida
Curtis D. Pollman, T. M. Lee, William J. Andrews, L. A. Sacks, S.A. Gherini, R.K. Munson
1991, Water Resources Research (27) 2321-2335
In late 1988, parallel studies of Lake Five‐O (pH 5.14) in the Florida panhandle and Lake Barco (pH 4.50) in north central Florida were initiated to develop hydrologic and major ion budgets of these lakes as part of an overall effort to improve understanding of the hydrologic, depositional, and biogeochemical...
Assessing the solubilities and reaction kinetics of aluminous minerals in soils
Howard M. May, D. Kirk Nordstrom
1991, Book chapter, Solid acidity
The use of chemical thermodynamics and reaction kinetics is necessary to quantitatively model the transformation of aluminous minerals and their dissolved constituents in soils and other geochemical systems. Soils are thermodynamically open systems subject to atmospheric and biological forces and do not attain overall thermodynamic equilibrium with respect to either...
Predicting the response of woody riparian vegetation to changes in instream flows through integrated monitoring of stream hydrology and riparian vegetation
M. L. Scott, L.J. Martin, Gregor T. Auble, C.A. Segelquist
1991, Report, South Platte River resource management: Finding a balance - Conference Proceedings
No abstract available....
Evaluation of unsaturated zone air permeability through pneumatic tests
Arthur L. Baehr, Marc F. Hult
1991, Water Resources Research (27) 2605-2617
Predicting the steady state distribution of air pressure in the unsaturated zone resulting from a pneumatic test provides a method for determining air-phase permeability. This technique is analogous to the inverse problem of well hydraulics; however, air flow is more complicated than ground water flow because of air compressibility, the...
Hydrology of a riparian forested area on Boulder Creek
L.J. Martin
1991, Book, South Platte River resource management: Finding a balance
No abstract available....
Development of assessment methods for hydrologic impacts on western riparian ecosystems
Lee S. Ischinger
1991, Book, South Platte River resource management: Finding a balance
No abstract available....
Riparian vegetation of the Black Canyon of the Gunnison River, Colorado: composition and response to selected hydrologic regimes based on a direct gradient assessment model
Gregor T. Auble, Jonathan M. Friedman, Michael L. Scott
1991, Report
The Black Canyon of the Gunnison National Monument is located along the Gunnison River on the western slope of the Rocky Mountains in Montrose County, Colorado. The canyon is narrow because it is cut into resistant pre-Cambrian gneiss: it has a maximum depth of 900m and a minimum width of...
Effects of surfactants on the mobility of nonpolar organic contaminants in porous media
J. A. Smith, D. Tucker, P. R. Jaffe, R.T. Mueller
R. Baker, editor(s)
1991, Book chapter, Organic substances and sediments in water
No abstract available....
Response of plains cottonwood seeds and seedlings to simulated hydrologic regimes of the riparian zone
C.A. Segelquist
1991, Book, South Platte River resource management: Finding a balance
No abstract available....
A thermodynamic partition model for binding of nonionic organic compounds by organic colloids and implications for their sorption to soils and sediment
U.P. Chin, Walter J. Weber Jr., C. T. Chiou
R.A. Baker, editor(s)
1991, Book chapter, Organic substances and sediments in water: Humics and soils
No abstract available....
Parameters involved in modeling movement of bacteria in groundwater
Ronald W. Harvey
C. J. Hurst, editor(s)
1991, Book chapter, Modeling the environmental fate of microorganisms
No abstract available....
Particulate and colloidal organic material in Pueblo Reservoir, Colorado--Influence of autochthonous source on chemical composition
J. F. Ranville, R.A. Harnish, D.M. McKnight
R.A. Baker, editor(s)
1991, Book chapter, Organic substances and sediments in water
No abstract available. ...
The hydrogeologic framework of the Northern Coastal Province Aquifer System of Puerto Rico
Jesus Rodriguez-Martinez
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1991, Conference Paper, Aquifers of the Caribbean Islands, Proceedings of the International Symposium on Tropical Hydrology
Solution of the one-dimensional consolidation theory equation with a pseudospectral method
N. Sepulveda
Anon, editor(s)
1991, Conference Paper, IAHS Publication (International Association of Hydrological Sciences)
The one-dimensional consolidation theory equation is solved for an aquifer system using a pseudospectral method. The spatial derivatives are computed using Fast Fourier Transforms and the time derivative is solved using a fourth-order Runge-Kutta scheme. The computer model calculates compaction based on the void ratio changes accumulated during the simulated...
Balloon and core sampling for determining bulk density of alluvial desert soil
Brian J. Andraski
1991, Soil Science Society of America Journal (55) 1188-1190
Samples were collected from major strata in the upper 5 m of an alluvial soil profile in the Amargosa Desert of southern Nevada to compare rubber-balloon and drive-core bulk-density measurement methods. For strate where the fine soil was <82% sand and <15% clay, differences between total and fine-soil bulk-density values...
Herbicides in surface waters of the midwestern United States: The effect of spring flush
E.M. Thurman, D. A. Goolsby, M. T. Meyer, D.W. Kolpin
1991, Environmental Science & Technology (25) 1794-1796
Approximately three-fourths of all preemergent herbicides used in the United States are applied to row crops over a 12-state area, called the "corn belt" (I). The application of these compounds may cause widespread degradation of water quality (2). Because herbicides are water soluble, there is the potential for leaching into...
Large-scale distribution of metal contamination in the fine-grained sediments of the Clark Fork River, Montana, U.S.A.
E.V. Axtmann, S. N. Luoma
1991, Applied Geochemistry (6) 75-88
Historic discharges from the mining and smelting complex at the head-waters of the Clark Fork River have resulted in elevated Ag, Cd, Cu, Pb and Zn concentrations in the <60 μm fraction of both bed and flood-plain sediments of the river. Processes affecting the trends in longitudinal distributions of these...
The Vigil Network: A means of observing landscape change in drainage basins
W. R. Osterkamp, W. W. Emmett, Luna Bergere Leopold
1991, Hydrological Sciences Journal (36) 331-344
Long-term monitoring of geomorphic, hydrological, and biological characteristics of landscapes provides an effective means of relating observed change to possible causes of the change. Identification of changes in basin characteristics, especially in arid areas where the response to altered climate or land use is generally rapid and readily apparent, might...
An intercomparison of hydrological network-design technologies
M. E. Moss, Gary D. Tasker
1991, Hydrological Sciences Journal (36) 209-221
Two network-design technologies are compared by random sub-sampling of actual streamflow data. The technologies, Network Analysis for Regional Information (NARI) and Network Analysis Using Generalized Least Squares (NAUGLS), have a common objective, viz. to maximize regional information within a limited budget and time horizon. The data used for intercomparison are...
Formation and transport of deethylatrazine in the soil and vadose zone
C.D. Adams, E.M. Thurman
1991, Journal of Environmental Quality (20) 540-547
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) and two degradation products were monitored at seven depths in the soil and vadose zone throughout the growing season in two experimental plots in which corn (Zea mays L.) was grown. The soils in these plots were a Kimo silty clay loam (clayey over loamy, montmorillonitic, mesic, Fluvaquentic...
Response of Ned Wilson Lake watershed, Colorado, to changes in atmospheric deposition of sulfate
Donald H. Campbell, John T. Turk, Norman E. Spahr
1991, Water Resources Research (27) 2047-2060
The Ned Wilson Lake watershed responds directly and rapidly to changes in precipitation inputs of sulfate, which has important implications for effects of acid deposition on the aquatic system. Chemistry at three precipitation collection sites and three watershed sites (a pond, a lake, and a spring) has been monitored in...
Volcanic ash dispersed in the Wyodak-Anderson coal bed, Powder River Basin, Wyoming
Don M. Triplehorn, R.W. Stanton, Leslie F. Ruppert, Sharon S. Crowley
1991, Organic Geochemistry (17) 567-575
Minerals derived from air-fall volcanic ash were found in two zones in the upper Paleocene Wyodak-Anderson coal bed of the Fort Union Formation in the Powder River Basin of Wyoming, and are the first reported evidence of such volcanic material in this thick (> 20 m) coal bed. The volcanic...
Compilation of hydrologic data for the Edwards aquifer, San Antonio area, Texas, 1990, with 1934–90 summary
D.S. Brown, Jon R. Gilhousen, G.M. Nalley
1991, Edwards Underground Water District Bulletin 50
No abstract available....
Evaluation of geographic information systems for three-dimensional ground-water modeling, Yucca Mountain, Nevada
A. Keith Turner, Elisabeth M. Ervin, Joe S. Downey
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Fully three-dimensional representations of the geologic system at Yucca Mountain have been developed using a Geoscientific Information System, which is an expansion of a traditional Geographic Information Systems. These advanced, three dimensional, representations of Yucca Mountain are required to adequately evaluate the complex geologic and hydrologic conditions surrounding the site....
Convergent radial dispersion: A note on evaluation of the Laplace transform solution
Allen F. Moench
1991, Water Resources Research (27) 3261-3264
A numerical inversion algorithm for Laplace transforms that is capable of handling rapid changes in the computed function is applied to the Laplace transform solution to the problem of convergent radial dispersion in a homogeneous aquifer. Prior attempts by the author to invert this solution were unsuccessful for highly advective...
