Geochemical Modeling of the Madison Aquifer in Parts of Montana, Wyoming, and South Dakota
L.N. Plummer, J.F. Busby, R. W. Lee, B.B. Hanshaw
1990, Water Resources Management (26) 1981-2014
Stable isotope data for dissolved carbonate, sulfate, and sulfide are combined with water composition data to construct geochemical reaction models along eight flow paths in the Madison aquifer in parts of Wyoming, Montana, and South Dakota. The sulfur isotope data are treated as an isotope dilution problem, whereas the carbon...
Diurnal time-activity budgets of wintering canvasbacks in Louisiana
William L. Hohman, D.P. Rave
1990, Wilson Bulletin (102) 645-654
We determined diurnal time-activity budgets of Canvasbacks (Aythya valisineria) at Catahoula Lake and at the Mississippi River Delta, Louisiana, from December 1987 to March 1988. Canvasback feeding, resting, locomotory, and comfort activities varied by month and location with a month-location interaction. Moreover, the percentage of time spent feeding varied by...
Numerical simulation of tidal dispersion around a coastal headland
R. P. Signell, W. Rockwell Geyer
Ralph T. Cheng, editor(s)
1990, Book chapter, Residual Currents and Long-Term Transport
Tidal flows around headlands can exhibit strong spatial gradients in the Eulerian currents, resulting in complex Lagrangian trajectories and dispersion of the vertically integrated flow. This typically occurs when the horizontal length scale of the headland is comparable to or smaller than the tidal excursion. The effects of these headlands...
Reevaluation of large-scale dispersivities for a waste chloride plume: Effects of transient flow
Daniel J. Goode, Leonard F. Konikow
1990, Conference Paper, ModelCARE 90: Calibration and Reliability in Groundwater Modelling
This paper investigates the effects of transient groundwater flow on dispersion of a waste chloride plume in the basaltic aquifer beneath the Idaho (USA) National Engineering Laboratory. In an early application of numerical modeling techniques to the two-dimensional simulation of field-scale plumes, previous investigators identified longitudinal and transverse dispersivities using...
Keweenaw hot spot: Geophysical evidence for a 1.1 Ga mantle plume beneath the Midcontinent Rift System
D. R. Hutchinson, R.S. White, W.F. Cannon, K. J. Schulz
1990, Journal of Geophysical Research B: Solid Earth (95) 10869-10884
The Proterozoic Midcontinent Rift System of North America is remarkably similar to Phanerozoic rifted continental margins and flood basalt provinces. Like the younger analogues, the volcanism within this older rift can be explained by decompression melting and rapid extrusion of igneous material during lithospheric extension above a broad,...
Paleogeography and Paleo-oceanography of the Miocene of the southeastern United States
P. Popenoe
1990, Book chapter, Phosphate deposits of the World: Neogene to Modern Phosphorites
No abstract available....
The origin of large local uplift in extensional regions
G. King, M. Ellis
1990, Nature (348) 689-693
Large localized uplift is commonly observed in continental regions undergoing extension. These observations can be modelled by planar, high-angle normal faulting of an elastic upper crust overlying an inviscid lower crust. Isostasy provides the necessary driving force. The model quantifies the role of flexural rigidity, density variations in the crust,...
Kinematics of late Paleozoic continental collision between Laurentia and Gondwana
P. E. Sacks, D.T. Secor Jr.
1990, Science (250) 1702-1705
In the Appalachians, late Paleozoic Alleghanian orogenesis is widely regarded as resulting from dextral oblique collision between irregular margins of Gondwana and Laurentia. However, this relative plate motion cannot account for coeval convergence in the Ouachitas and Variscides and is incompatible with some tectonic transport indicators in the Appalachians. An...
Geodetic estimate of coseismic slip during the 1989 Loma Prieta, California, Earthquake
Michael Lisowski, W.H. Prescott, James C. Savage, M. J. Johnson
1990, Geophysical Research Letters (17) 1437-1440
Offsets in the relative positions of geodetic stations resulting from the Loma Prieta earthquake can be explained with a dislocation model that includes buried oblique slip on a rupture surface extending 37 km along the strike of the San Andreas fault, dipping 70° to the SW, and extending from a...
Development of survival skills in captive-raised Siberian polecats (Mustela eversmanni) II: predator avoidance
Brian Miller, Dean Biggins, Chris Wemmer, Roger Powell, Lorena Calvo, Lou Hanebury, Tracy Wharton
1990, Journal of Ethology (8) 95-104
We exposed naive Siberain polecats (Mustela eversmanni) (aged 2, 3, and 4 months) to a swooping stuffed great horned owl (Buho virginianus) and a stuffed badger (Taxidae taxus) mounted on a remote control toy automobile frame. The first introduction to each was harmless, the second was accompanied by a mild...
Reference manual for generation and analysis of Habitat Time Series: version II
Robert T. Milhous, John M. Bartholow, Marlys A. Updike, Alan R. Moos
1990, Report, Instream Flow Information Paper 27
The selection of an instream flow requirement for water resource management often requires the review of how the physical habitat changes through time. This review is referred to as 'Time Series Analysis." The Tune Series Library (fSLIB) is a group of programs to enter, transform, analyze, and display time series data...
The chemistry of iron, aluminum, and dissolved organic material in three acidic, metal-enriched, mountain streams, as controlled by watershed and in-stream processes
Diane M. McKnight, Kenneth E. Bencala
1990, Water Resources Research (26) 3087-3100
Several studies were conducted in three acidic, metal-enriched, mountain streams, and the results are discussed together in this paper to provide a synthesis of watershed and in-stream processes controlling Fe, Al, and DOC (dissolved organic carbon) concentrations. One of the streams, the Snake River, is naturally acidic; the other two,...
The late Cenozoic evolution of the Tuolumne River, central Sierra Nevada, California
N.K. Huber
1990, GSA Bulletin (102) 102-115
Erosional remnants of volcanic rock deposited in a lO-m.y.-old channel of the Tuolumne River permit its partial reconstruction. Projection of the reconstructed channel west to the Central Valley and east to the range crest, together with several assumptions about the position of the hinge line and changes in channel gradient,...
Use of wildlife models for habitat management
D.F. Stauffer, A.H. Farmer, B.S. Cade
1990, Book, Proceedings : resource technology 90, Second International Symposium on Advanced Technology in Natural Resource Management
No abstract available....
Multiple scales of patchiness and patch structure: a hierarchical framework for the study of heterogeneity
Natasha B. Kotliar, John A. Wiens
1990, Oikos (59) 253-260
We develop a hierarchical model of heterogeneity that provides a framework for classifying patch structure across a range of scales. Patches at lower levels in the hierarchy are more simplistic and correspond to the traditional view of patches. At levels approaching the upper bounds of the hierarchy the internal structure...
Transferring models: the case of the physical habitat simulation system
Robert T. Milhous
1990, Book, Transferring models to users
No abstract available....
Simulation of lake evaporation with application to modeling lake level variations of Harney‐Malheur Lake, Oregon
Steven W. Hostetler, Patrick J Bartlein
1990, Water Resources Research (26) 2603-2612
A physically based eddy diffusion model for simulating the seasonal variation in lake temperature and evaporation is presented and validated. Because no lake‐specific fitting of the parameters of the model is necessary, the model can be used to simulate evaporation in studies of climate change and lake...
Subsurface energy storage and transport for solar-powered geysers on Triton
Randolph L. Kirk, Robert H. Brown, Laurence A. Soderblom
1990, Science (250) 424-429
The location of active geyser-like eruptions and related features close to the current subsolar latitude on Triton suggests a solar energy source for these phenomena. Solidstate greenhouse calculations have shown that sunlight can generate substantially elevated subsurface temperatures. A variety of models for the storage of solar energy in a...
Triton's geyser-like plumes: Discovery and basic characterization
Laurence A. Soderblom, S. W. Kieffer, T.L. Becker, R. H. Brown, A.F. Cook II, C.J. Hansen, T. V. Johnson, Randolph L. Kirk, E.M. Shoemaker
1990, Science (250) 410-415
At least four active geyser-like eruptions were discovered in Voyager 2 images of Triton, Neptune's large satellite. The two best documented eruptions occur as columns of dark material rising to an altitude of about 8 kilometers where dark clouds of material are left suspended to drift downwind over 100 kilometers....
Tests of a habitat suitability model for black-capped chickadees
Richard L. Schroeder
1990, Report
The black-capped chickadee (Parus atricapillus) Habitat Suitability Index (HSI) model provides a quantitative rating of the capability of a habitat to support breeding, based on measures related to food and nest site availability. The model assumption that tree canopy volume can be predicted from measures of tree height and...
Volcanism in Northwest Ishtar Terra, Venus
Lisa R. Gaddis, Ronald Greeley
1990, Icarus (87) 327-338
Soviet Venera 15/16 radar images and topographic data for an area in NW Ishtar Terra, Venus (74°N, 313°E) contain evidence for the existence of a complex volcanic center. Located at the intersection of Akna and Freyja Montes (both elevated ∼4 to 7 km above the planetary reference radius of 6051...
Survival and band recovery rates of mallards in New Zealand
James D. Nichols, Murray Williams, Tom Caithness
1990, Journal of Wildlife Management (54) 629-636
Mallards (Anas platyrhynchos) were banded at 4 discrete study areas in New Zealand. We used hunting season recoveries in conjunction with band recovery models to estimate annual survival and recovery rates and to test hypotheses about sources of variation in these rates. Recovery rates varied among the 4 areas and...
Forecasting damaging earthquakes in the central and eastern United States
S.P. Nishenko, G. A. Bollinger
1990, Science (249) 1412-1416
Analysis of seismograph network data, earthquake catalogs from 1727 to 1982, and paleoseismic data for the central and eastern United States indicate that the Poisson probability of a damaging earthquake (magnitude ≥ 6.0) occurring during the next 30 years is at a moderate to high level (0.4 to 0.6). When...
New explorations at the Stoneham, Colorado, barite locality
P.J. Modreski, B. Lees, D. Wilson
1990, Rocks & Minerals (65) 203-222
No abstract available. ...
In situ retention-transport response to nitrate loading and storm discharge in a third-order stream
Frank J. Triska, Vance C. Kennedy, Ronald J. Avanzino, Gary W. Zellweger, Kenneth E. Bencala
1990, Journal of the North American Benthological Society (9) 229-239
Nitrate retention was assayed in a 264-m reach of a third-order stream, Little Lost Man Creek, Humboldt County, California, USA. Nitrate budgets (24-48 hours) were calculated under background conditions, and during four other intervals of modified nitrate concentration caused by nutrient amendment or storm-enhanced discharge. Under background, low-flow conditions, the...
