Precipitation interpolation in mountainous regions using multiple linear regression
L. Hay, R. Viger, G. McCabe
1998, IAHS-AISH Publication (248) 33-38
Multiple linear regression (MLR) was used to spatially interpolate precipitation for simulating runoff in the Animas River basin of southwestern Colorado. MLR equations were defined for each time step using measured precipitation as dependent variables. Explanatory variables used in each MLR were derived for the dependent variable locations from a...
Potentially hazardous elements in coal: Modes of occurrence and summary of concentration data for coal components
Allan Kolker, Robert B. Finkelman
1998, Coal Preparation (19) 133-157
Mode-of-occurrence data are summarized for 13 potentially hazardous elements (Be, Cr, Mn, Co, Ni, As, Se, Cd, Sb, Hg, Pb, Th, U) in coal. Recent work has refined mode-of-occurrence data for Ni, Cr, and As, as compared to previous summaries. For Cr, dominant modes of occurrence include the clay mineral...
Frequency of effective wave activity and the recession of coastal bluffs: Calvert Cliffs, Maryland
P.R. Wilcock, D. S. Miller, R.H. Shea, R.T. Kerkin
1998, Journal of Coastal Research (14) 256-268
The Calvert Cliffs, Chesapeake Bay, Maryland, USA, erode by direct wave undercutting or by freeze/thaw erosion accompanied by wave removal of slope debris. Directly undercut slopes recede more rapidly, with long-term rates exceeding 1.0 m/yr; freeze/thaw slopes recede at rates approaching 0.5 m/yr. The frequency of wave height and water...
Routes and travel rates of migrating Peregrine Falcons Falco peregrinus and Swainson's Hawks Buteo swainsoni in the Western Hemisphere
Mark R. Fuller, William S. Seegar, Linda S. Schueck
1998, Journal of Avian Biology (29) 433-440
We describe and compare the migration routes, length of migration, and duration of migration of Peregrine Falcons Falco peregrinus tundrius and Swainson's Hawks Buteo swainsoni in the Western Hemisphere. We radio tracked migrants using the Argos satellite system. Our initial samples were 34 Swainson's Hawks from representative areas of their...
The interplinian activity at Somma-Vesuvius in the last 3500 years
G. Rolandi, P. Petrosino, Geehin J. Mc
1998, Journal of Volcanology and Geothermal Research (82) 19-52
Between 1884 B.C. and A.D. 472, eruptive activity at Somma-Vesuvius was dominated by the three plinian eruptions of Avellino (3550 yr B.P.), Pompei (A.D. 79) and A.D. 472 and, as a result, little attention has been given to the intervening interplinian activity. The interplinian events are here reconstructed using new...
Information-theoretic model selection and model averaging for closed-population capture-recapture studies
Thomas R. Stanley, Kenneth P. Burnham
1998, Biometrical Journal (40) 475-494
Specification of an appropriate model is critical to valid statistical inference. Given the “true model” for the data is unknown, the goal of model selection is to select a plausible approximating model that balances model bias and sampling variance. Model selection based on information criteria such as AIC or its...
AIRSAR studies of woody shrub density in semiarid rangeland: Jornada del Muerto, New Mexico
H.B. Musick, G.S. Schaber, C. S. Breed
1998, Remote Sensing of Environment (66) 29-40
This study evaluates the use of polarimetric Airborne Synthetic Aperture Radar (AIRSAR) data to assess woody shrub density in a semiarid site where the vegetation consists primarily of varied mixtures of herbaceous vegetation and shrubs. AIRSAR data and field observations of vegetation cover and growth form-composition were obtained for 59...
New approach to analyzing soil-building systems
E. Safak
1998, Soil Dynamics and Earthquake Engineering (17) 509-517
A new method of analyzing seismic response of soil-building systems is introduced. The method is based on the discrete-time formulation of wave propagation in layered media for vertically propagating plane shear waves. Buildings are modeled as an extension of the layered soil media by assuming that each story in the...
Radar attenuation tomography using the centroid frequency downshift method
L. Liu, J. W. Lane, Y. Quan
1998, Journal of Applied Geophysics (40) 105-116
A method for tomographically estimating electromagnetic (EM) wave attenuation based on analysis of centroid frequency downshift (CFDS) of impulse radar signals is described and applied to cross-hole radar data. The method is based on a constant-Q model, which assumes a linear frequency dependence of attenuation...
Three-dimensional P-wave velocity structure of Mt. Etna, Italy
A. Villasenor, H.M. Benz, L. Filippi, G. De Luca, R. Scarpa, G. Patane, S. Vinciguerra
1998, Geophysical Research Letters (25) 1975-1978
The three-dimensional P-wave velocity structure of Mt. Etna is determined to depths of 15 km by tomographic inversion of first arrival times from local earthquakes recorded by a network of 29 permanent and temporary seismographs. Results show a near-vertical low-velocity zone that extends from beneath the central...
Relation of climate change to the acidification of surface waters by nitrogen deposition
Peter S. Murdoch, Douglas A. Burns, G.B. Lawrence
1998, Environmental Science & Technology (32) 1642-1647
Abrupt increases and decreases in mean seasonal and annual stream NO3- concentrations during the period of record (1983-1995) at Biscuit Brook, a headwater stream in the Catskill Mountains of New York, have provided an opportunity to study the biogeochemical processes that control NO3- movement through forested watersheds. The Catskills receive...
Biodegradation of crude oil into nonvolatile organic acids in a contaminated aquifer near Bemidji, Minnesota
K. A. Thorn, G. R. Aiken
1998, Organic Geochemistry (29) 909-931
As the result of a pipeline burst, a body of light aliphatic crude oil floats atop the groundwater in a shallow sand and gravel aquifer in a remote area outside Bemidji, Minnesota. Biodegradation has resulted in the formation of a plume of DOC downgradient from the oil body. Groundwater has...
Considerations in As analysis and speciation
M. Edwards, S. Patel, L. McNeil, H.W. Chen, M. Frey, A.D. Eaton, Ronald C. Antweiler, Howard E. Taylor
1998, Journal of the American Water Works Association (43) 1378-1383
This article summarizes recent experiences in arsenic (As) quantification, preservation, and speciation developed during AWWA Research Foundation (AWWARF) and Water Industry Technical Action Fund (WITAF) projects. The goal of this article is to alert analysts and decision-makers to potential problems in As analysis and speciation, because there appear to be...
Backyard bolides: Finding a buried impact crater
C. Wylie Poag
1998, The Planetary Report (18) 6-8
Geologist Wylie Poag explains how he happened to find a major impact crater buried beneath Chesapeake Bay....
Genetic differentiation between wintering populations of lesser snow geese nesting on Wrangel Island, Russia
S.B. Kuznetsov, Vasily V. Baranyuk, John Y. Takekawa
1998, The Auk (115) 1053-1057
Arctic breeding populations of Lesser Snow Geese (Chen c. caerulescens) range from Baffin Island in eastern Canada to Wrangel Island, Russia, which is located 650 km west of Alaska (Bellrose 1980). Although hundreds of thousands of Lesser Snow Geese may have occupied the Russian arctic in the mid1800s (see Takekawa...
A classification of quaternary dating methods
S.M. Colman, K. L. Pierce
Jay S. Noller, Janet M. Sowers, William R. Lettis, editor(s)
1998, U.S. Nuclear Regulatory Commission Report NUREG/CR-5562
No abstract available....
Seabirds of the Chukotka Peninsula, Russia
N. B. Konyukhov, L. S. Bogoslovskaya, B. M. Zvonov, Thomas I. van Pelt
1998, Arctic (51) 315-329
We conducted seabird surveys along the entire coast of the Chukotka Peninsula (northwestern Siberia, Russia) from 1983 to 1991. We present the first comprehensive descriptions of the distribution and size of Chukotkan seabird colonies. Thirteen species of seabirds were recorded breeding on the peninsula, with an additional 13 migrant or...
Cultural resource applications for a GIS: Stone conservation at Jefferson and Lincoln Memorials
Kyle Joly, Tony Donald, Douglas Comer
1998, Cultural Resources Management (21) 17-18
Geographical information systems are rapidly becoming essential tools for land management. They provide a way to link landscape features to the wide variety of information that managers must consider when formulating plans for a site, designing site improvement and restoration projects, determining maintenance projects and protocols, and even interpreting the...
Feldspars as a source of nutrients for microorganisms
J.R. Rogers, P.C. Bennett, W.J. Choi
1998, American Mineralogist (83) 1532-1540
Phosphorus and nitrogen are essential macronutrients necessary for the survival of virtually all living organisms. In groundwater systems, these nutrients can be quite scarce and can represent limiting elements for growth of subsurface microorganisms. In this study we examined silicate sources of these elements by characterizing the colonization and weathering...
Waterfowl in the prairie pothole region
Jane E. Austin
M. J. Mac, P.A. Opler, C. E. Puckett Haecker, P.D. Doran, editor(s)
1998, Book chapter, Status and trends of the nation's biological resources
The prairie pothole region of the northern Great Plains is one of the most important areas for duck reproduction in North America. The region produces, on average, 50% of the primary species of game ducks on the continent (Smith 1995), yet accounts for only 10% of the waterfowl breeding habitat...
Pitcher's thistle (Cirsium pitcheri) recovery plan
Pavlovic et al
1998, Report
No abstract available at this time...
Preliminary Survey of the Fish of the Santa Margarita River Watershed, San Diego and Riverside Counties, California
Robert N. Fisher, C. C. Swift
1998, Report
No abstract available at this time...
Coupling demography, physiology and evolution in chaparral shrubs,
Jon E. Keeley
P.W. Rundel, G. Montenegro, F.M. Jaksic, editor(s)
1998, Book chapter, Landscape Disturbance and Biodiversity in Mediterranean-Type Ecosystems.
Historically, since fire is a recurrent catastrophic disturbance, mediterranean-climate shrubs have been classified by their mode of postfire regeneration, i.e., obligate seeders, facultative seeders or obligate resprouters. While these terms are useful, they are too restrictive in that they only refer to a species’ response to fire and do not...
Ecology of the Island Night Lizard, Xantusia riversiana, on San Nicolas Island, California
Gary M. Fellers, Charles A. Drost, William J. Mautz, Thomas G. Murphey
1998, Report
No abstract available at this time...
Twenty-two years of passing shortnose sturgeon in fish lifts on the Connecticut River: What has been learned?
B. Kynard
M. Jungwirth, S. Schmutz, S. Weiss, editor(s)
1998, Book chapter, Fish Migration and Fish Bypasses
No abstract available at this time...
