Utilizing geochemical, hydrologic, and boron isotopic data to assess the success of a salinity and selenium remediation project, Upper Colorado River Basin, Utah
D. L. Naftz, T.D. Bullen, Bernard J. Stolp, C.D. Wilkowske
2008, Science of the Total Environment (392) 1-11
Stream discharge and geochemical data were collected at two sites along lower Ashley Creek, Utah, from 1999 to 2003, to assess the success of a site specific salinity and Se remediation project. The remediation project involved the replacement of a leaking sewage lagoon system that was interacting with Mancos Shale...
Characterization of the shallow groundwater system in an alpine watershed: Handcart Gulch, Colorado, USA
Katherine G. Kahn, Shemin Ge, Jonathan S. Caine, A. Manning
2008, Hydrogeology Journal (16) 103-121
Water-table elevation measurements and aquifer parameter estimates are rare in alpine settings because few wells exist in these environments. Alpine groundwater systems may be a primary source of recharge to regional groundwater flow systems. Handcart Gulch is an alpine watershed in Colorado, USA comprised of highly fractured Proterozoic metamorphic and...
Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region
B.D. Hall, G. R. Aiken, D. P. Krabbenhoft, M. Marvin-DiPasquale, C.M. Swarzenski
2008, Environmental Pollution (154) 124-134
It is widely recognized that wetlands, especially those rich in organic matter and receiving appreciable atmospheric mercury (Hg) inputs, are important sites of methylmercury (MeHg) production. Extensive wetlands in the southeastern United States have many ecosystem attributes ideal for promoting high MeHg production rates; however, relatively few mercury cycling studies...
Multistage late Cenozoic evolution of the Amargosa River drainage, southwestern Nevada and eastern California Society of America. All rights reserved
C.M. Menges
2008, Conference Paper, Special Paper of the Geological Society of America
Stratigraphic and geomorphic analyses reveal that the regional drainage basin of the modern Amargosa River formed via multistage linkage of formerly isolated basins in a diachronous series of integration events between late Miocene and latest Pleistocene-Holocene time. The 275-km-long Amargosa River system drains generally southward across a large (15,540 km<sup>...
Mathematical models frame environmental dispute [Review of the article Useless arithmetic: Ten points to ponder when using mathematical models in environmental decision making]
Berton Lee Lamb, Nina Burkardt
2008, Public Administration Review (68) 55-60
When Linda Pilkey- Jarvis and Orrin Pilkey state in their article, "Useless Arithmetic," that "mathematical models are simplified, generalized representations of a process or system," they probably do not mean to imply that these models are simple. Rather, the models are simpler than nature and that is the heart of...
Pathogen and chemical transport in the karst limestone of the Biscayne aquifer: 2. Chemical retention from diffusion and slow advection
Allen M. Shapiro, Robert A. Renken, Ronald W. Harvey, Michael R. Zygnerski, David W. Metge
2008, Water Resources Research (44)
A tracer experiment, using a nonreactive tracer, was conducted as part of an investigation of the potential for chemical and pathogen migration to public supply wells that draw groundwater from the highly transmissive karst limestone of the Biscayne aquifer in southeastern Florida. The tracer was injected into the formation over...
Investigation and hazard assessment of the 2003 and 2007 Staircase Falls rock falls, Yosemite National Park, California, USA
G. F. Wieczorek, Gregory M. Stock, P. Reichenbach, J.B. Snyder, J. W. Borchers, J. W. Godt
2008, Natural Hazards and Earth System Sciences (8) 421-432
Since 1857 more than 600 rock falls, rock slides, debris slides, and debris flows have been documented in Yosemite National Park, with rock falls in Yosemite Valley representing the majority of the events. On 26 December 2003, a rock fall originating from west of Glacier Point sent approximately 200 m...
Soil slip/debris flow localized by site attributes and wind-driven rain in the San Francisco Bay region storm of January 1982
R.J. Pike, S. Sobieszczyk
2008, Geomorphology (94) 290-313
GIS analysis at 30-m resolution reveals that effectiveness of slope-destabilizing processes in the San Francisco Bay area varies with compass direction. Nearly half the soil slip/debris flows mapped after the catastrophic rainstorm of 3-5 January 1982 occurred on slopes that face S to WSW, whereas fewer than one-quarter have a...
Suspended sediment transport in the freshwater reach of the Hudson river estuary in eastern New York
G. R. Wall, E.A. Nystrom, S. Litten
2008, Estuaries and Coasts (31) 542-553
Deposition of Hudson River sediment into New York Harbor interferes with navigation lanes and requires continuous dredging. Sediment dynamics at the Hudson estuary turbidity maximum (ETM) have received considerable study, but delivery of sediment to the ETM through the freshwater reach of the estuary has received relatively little attention and...
Measuring real-time streamflow using emerging technologies: Radar, hydroacoustics, and the probability concept
J. Fulton, J. Ostrowski
2008, Journal of Hydrology (357) 1-10
Forecasting streamflow during extreme hydrologic events such as floods can be problematic. This is particularly true when flow is unsteady, and river forecasts rely on models that require uniform-flow rating curves to route water from one forecast point to another. As a result, alternative methods for measuring streamflow are needed...
Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium
A. F. White, M. S. Schulz, David A. Stonestrom, D.V. Vivit, J. Fitzpatrick, T. Bullen
2008, Mineralogical Magazine (72) 149-153
The spatial and temporal changes in hydrology and pore water elemental and 87/86Sr compositions were used to determine contemporary weathering rates in a 65 to 226 ky old soil chronosequence formed from granitic sediments deposited on marine terraces along coastal California. Cl-corrected Na, K and Si increased with depth denoting inputs...
Application of synchrotron methods to assess the uptake of roadway-derived Zn by earthworms in an urban soil
S.M. Lev, E. R. Landa, K. Szlavecz, R. Casey, J. Snodgrass
2008, Mineralogical Magazine (72) 191-195
The impact of human activities on biogeochemical cycles in terrestrial environments is nowhere more apparent than in urban landscapes. Trace metals, collected on roadways and transported by storm water, may contaminate soils and sediments associated with storm water management systems. These systems will accumulate metals and associated sediments may reach...
A comparison of winter mercury accumulation at forested and no-canopy sites measured with different snow sampling techniques
S.J. Nelson, K.B. Johnson, K.C. Weathers, C.S. Loftin, I.J. Fernandez, J. S. Kahl, D. P. Krabbenhoft
2008, Applied Geochemistry (23) 384-398
Atmospheric mercury (Hg) is delivered to ecosystems via rain, snow, cloud/fog, and dry deposition. The importance of snow, especially snow that has passed through the forest canopy (throughfall), in delivering Hg to terrestrial ecosystems has received little attention in the literature. The snowpack...
Electricity generation by anaerobic bacteria and anoxic sediments from hypersaline soda lakes
L.G. Miller, R.S. Oremland
2008, Extremophiles (12) 837-848
Anaerobic bacteria and anoxic sediments from soda lakes produced electricity in microbial fuel cells (MFCs). No electricity was generated in the absence of bacterial metabolism. Arsenate respiring bacteria isolated from moderately hypersaline Mono Lake (Bacillus selenitireducens), and salt-saturated Searles Lake, CA (strain SLAS-1) oxidized lactate using arsenate...
Removal of dissolved organic matter by anion exchange: Effect of dissolved organic matter properties
T.H. Boyer, P.C. Singer, G. R. Aiken
2008, Environmental Science & Technology (42) 7431-7437
Ten isolates of aquatic dissolved organic matter (DOM) were evaluated to determine the effect that chemical properties of the DOM, such as charge density, aromaticity, and molecular weight, have on DOM removal by anion exchange. The DOM isolates were characterized as terrestrial, microbial, or intermediate humic substances...
Use of an integrated flow model to estimate ecologically relevant hydrologic characteristics at stream biomonitoring sites
J.G. Kennen, L. J. Kauffman, M. A. Ayers, D.M. Wolock, Susan J. Colarullo
2008, Ecological Modelling (211) 57-76
We developed an integrated hydroecological model to provide a comprehensive set of hydrologic variables representing five major components of the flow regime at 856 aquatic-invertebrate monitoring sites in New Jersey. The hydroecological model simulates streamflow by routing water that moves overland and through the subsurface from atmospheric delivery to the...
A comparative analysis of simulated and observed landslide locations triggered by Hurricane Camille in Nelson County, Virginia
M.M. Morrissey, G. F. Wieczorek, B. A. Morgan
2008, Hydrological Processes (22) 524-531
In 1969, Nelson County, Virginia received up to 71 cm of rain within 12 h starting at 7 p.m. on August 19. The total rainfall from the storm exceeded the 1000-year return period in the region. Several thousands of landslides were induced by rainfall associated with Hurricane Camille causing fatalities...
Passive microwave (SSM/I) satellite predictions of valley glacier hydrology, Matanuska Glacier, Alaska
S.E. Kopczynski, J. Ramage, D. Lawson, S. Goetz, E. Evenson, J. Denner, G. Larson
2008, Geophysical Research Letters (35)
We advance an approach to use satellite passive microwave observations to track valley glacier snowmelt and predict timing of spring snowmelt-induced floods at the terminus. Using 37 V GHz brightness temperatures (Tb) from the Special Sensor Microwave hnager (SSM/I), we monitor snowmelt onset when both Tb and the difference between...
Potential for 4-n-nonylphenol biodegradation in stream sediments
P. M. Bradley, L. B. Barber, D.W. Kolpin, P.B. McMahon, F. H. Chapelle
2008, Environmental Toxicology and Chemistry (27) 260-265
The potential for in situ biodegradation of 4-nonylphenol (4-NP) was investigated in three hydrologically distinct streams impacted by wastewater treatment plants (WWTPs) in the United States. Microcosms were prepared with sediments from each site and amended with [U-ring-14C]4-n-nonylphenol (4-n-NP) as a model test substrate. Microcosms prepared with sediment collected upstream...
Effects of 2003 wildfires on stream chemistry in Glacier National Park, Montana
M. Alisa Mast, David W. Clow
2008, Hydrological Processes (22) 5013-5023
Changes in stream chemistry were studied for 4 years following large wildfires that burned in Glacier National Park during the summer of 2003. Burned and unburned drainages were monitored from December 2003 through August 2007 for streamflow, major constituents, nutrients, and suspended sediment following the fires. Stream-water nitrate concentrations showed...
Pathogen and chemical transport in the karst limestone of the Biscayne aquifer: 1. Revised conceptualization of groundwater flow
Robert A. Renken, Kevin J. Cunningham, Allen M. Shapiro, Ronald W. Harvey, Michael R. Zygnerski, David W. Metge, Michael A. Wacker
2008, Water Resources Research (44)
The Biscayne aquifer is a highly transmissive karst limestone that serves as the sole source of drinking water to over two million residents in south Florida. The aquifer is characterized by eogenetic karst, where the most transmissive void space can be an interconnected, touching‐vug, biogenically influenced porosity of biogenic origin....
Isotopic variations of dissolved copper and zinc in stream waters affected by historical mining
David M. Borrok, David Nimick, Richard B. Wanty, William I. Ridley
2008, Geochimica et Cosmochimica Acta (72) 329-344
Zinc and Cu play important roles in the biogeochemistry of natural systems, and it is likely that these interactions result in mass-dependent fractionations of their stable isotopes. In this study, we examine the relative abundances of dissolved Zn and Cu isotopes in a variety of stream waters draining six historical...
Mid-infrared diffuse reflectance spectroscopic examination of charred pine wood, bark, cellulose, and lignin: Implications for the quantitative determination of charcoal in soils
J. B. Reeves III, G.W. McCarty, D.W. Rutherford, R.L. Wershaw
2008, Applied Spectroscopy (62) 182-189
Fires in terrestrial ecosystems produce large amounts of charcoal that persist in the environment and represent a substantial pool of sequestered carbon in soil. The objective of this research was to investigate the effect of charring on mid-infrared spectra of materials likely to be present in forest...
Mercury and organic carbon dynamics during runoff episodes from a northeastern USA watershed
P. F. Schuster, J. B. Shanley, M. Marvin-DiPasquale, M.M. Reddy, G. R. Aiken, D.A. Roth, Howard E. Taylor, D. P. Krabbenhoft, J.F. DeWild
2008, Water, Air, & Soil Pollution (187) 89-108
Mercury and organic carbon concentrations vary dynamically in streamwater at the Sleepers River Research Watershed in Vermont, USA. Total mercury (THg) concentrations ranged from 0.53 to 93.8 ng/L during a 3-year period of study. The highest mercury (Hg) concentrations occurred slightly before peak flows and were associated with the highest...
Changes in the character of DOC in streams during storms in two Midwestern watersheds with contrasting land uses
P. Vidon, L.E. Wagner, E. Soyeux
2008, Biogeochemistry (88) 257-270
Dissolved organic carbon (DOC) dynamics in streams is important, yet few studies focus on DOC dynamics in Midwestern streams during storms. In this study, stream DOC dynamics during storms in two Midwestern watersheds with contrasting land uses, the change in character of stream DOC during storms, and the usability of...
