Simulation of ground-water discharge to Biscayne Bay, southeastern Florida
Christian D. Langevin
2001, Water-Resources Investigations Report 2000-4251
As part of the Place-Based Studies Program, the U.S. Geological Survey initiated a project in 1996, in cooperation with the U.S. Army Corps of Engineers, to quantify the rates and patterns of submarine ground-water discharge to Biscayne Bay. Project objectives were achieved through field investigations at three sites (Coconut Grove,...
Carbon balance of the terrestrial biosphere in the twentieth century: analyses of CO2, climate and land use effects with four process-based ecosystem models
A. D. McGuire, S. Sitch, Joy S. Clein, R. Dargaville, G. Esser, J. Foley, Martin Heimann, F. Joos, J. Kaplan, D. W. Kicklighter, R.A. Meier, J. M. Melillo, B. Moore III, I. C. Prentice, N. Ramankutty, T. Reichenau, A. Schloss, H. Tian, L.J. Williams, U. Wittenberg
2001, Global Biogeochemical Cycles (15) 183-206
The concurrent effects of increasing atmospheric CO2 concentration, climate variability, and cropland establishment and abandonment on terrestrial carbon storage between 1920 and 1992 were assessed using a standard simulation protocol with four process-based terrestrial biosphere models. Over the long-term(1920–1992), the simulations yielded a time history of terrestrial uptake that is...
Utilizing Mars Digital Image Model (MDIM) and Mars Orbiter laser Altimeter (MOLA) data for photogrammetric control
Mark R. Rosiek, Randolph L. Kirk, Trent M. Hare, Elpitha Howington-Kraus
2001, Conference Paper, Planetary Mapping: ISPRS Working Group IV/9 Workshop Proceedings
The USGS is producing digital elevation models (DEM) and topographic maps of Mars at scales of 1:250,000 to 1:1,000,000. The initial source material will be Viking Orbiter images, with a later transition to Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) when stereo coverage from that source is available for...
Elastic rebound following the Kocaeli earthquake, Turkey, recorded using synthetic aperture radar interferometry
Larry Mayer, Zhong Lu
2001, Geology (29) 495-498
A basic model incorporating satellite synthetic aperture radar (SAR) interferometry of the fault rupture zone that formed during the Kocaeli earthquake of August 17, 1999, documents the elastic rebound that resulted from the concomitant elastic strain release along the North Anatolian fault. For pure strike-slip faults, the elastic rebound function...
Common features and peculiarities of the seismic activity at Phlegraean Fields, Long Valley, and Vesuvius
W. Marzocchi, G. Vilardo, D.P. Hill, G.P. Ricciardi, C. Ricco
2001, Bulletin of the Seismological Society of America (91) 191-205
We analyzed and compared the seismic activity that has occurred in the last two to three decades in three distinct volcanic areas: Phlegraean Fields, Italy; Vesuvius, Italy; and Long Valley, California. Our main goal is to identify and discuss common features and peculiarities in the temporal evolution of earthquake sequences...
Statistical analysis of sand and gravel aggregate deposits of late Pleistocene Lake Bonneville, Utah
James D. Bliss, K. S. Bolm
2001, Book, Proceedings of the 35th Forum on the Geology of Industrial Minerals: the Intermountain West Forum 1999
Sedimentary deposits of pluvial Lake Bonneville are an important source of sand and gravel suitable for aggregate and construction in Utah. Data on Lake Bonneville basin sand and gravel deposit thickness, volume, grain size, percent of fines, and durability were statistically analyzed to detect variations associated with geologic domains, geographic...
Evolution of the conceptual model of unsaturated zone hydrology at Yucca Mountain, Nevada
Alan L. Flint, Lorraine E. Flint, Gudmundur S. Bodvarsson, Edward M. Kwicklis, June Fabryka-Martin
2001, Journal of Hydrology (247) 1-30
Yucca Mountain is an arid site proposed for consideration as the United States’ first underground high-level radioactive waste repository. Low rainfall (approximately 170 mm/yr) and a thick unsaturated zone (500–1000 m) are important physical attributes of the site because the quantity of water likely to reach the waste and the...
Applications of resistivity modeling in reservoir development: examples from Balder Field, Norwegian North Sea
Frederick L. Paillet, F.M. Haynes, O.M. Buretz
2001, Petrophysics (42) 17-18
The massive Paleocene oil sands of the Balder Field are overlain by several thinly bedded Eocene sand-prone packages of variable facies and reservoir quality. Although these sands have been penetrated by numerous exploration and development wells, uncertainty remains as to their extent, distribution, and ultimate effect on reservoir performance. The...
Regional fluid migration in the Illinois basin: Evidence from in situ oxygen isotope analysis of authigenic K-feldspar and quartz from the Mount Simon Sandstone
Zhensheng Chen, Lee R. Riciputi, Claudia I. Mora, Neil S. Fishman
2001, Geology (29) 1067-1070
Oxygen isotope compositions of widespread, authigenic K-feldspar and quartz overgrowths and cements in the Upper Cambrian Mount Simon Sandstone were measured by ion microprobe in 11 samples distributed across the Illinois basin and its periphery. Average K-feldspar δ18O values increase systematically from +14‰ ± 1‰ in the southernmost and deepest...
Paleohydrologic record of spring deposits in and around Pleistocene pluvial Lake Tecopa, southeastern California
Stephen T. Nelson, Haraldur R. Karlsson, James B. Paces, David G. Tingey, Stephen Ward, Mark T. Peters
2001, GSA Bulletin (113) 659-670
Tufa (spring) deposits in the Tecopa basin, California, reflect the response of arid groundwater regimes to wet climate episodes. Two types of tufa are represented, informally defined as (1) an easily disaggregated, fine-grained mixture of calcite and quartz (friable tufa) in the southwest Tecopa Valley, and (2) hard, vuggy micrite,...
Field trials of line transect methods applied to estimation of desert tortoise abundance
David R. Anderson, Kenneth P. Burnham, Bruce C. Lubow, L. E. N. Thomas, Paul Stephen Corn, Philip A. Medica, R.W. Marlow
2001, Journal of Wildlife Management (65) 583-597
We examine the degree to which field observers can meet the assumptions underlying line transect sampling to monitor populations of desert tortoises (Gopherus agassizii). We present the results of 2 field trials using artificial tortoise models in 3 size classes. The trials were conducted on 2 occasions on an area...
Processes controlling the episodic streamwater transport of atrazine and other agrichemicals in an agricultural watershed
Kenneth Hyer, George M. Hornberger, Janet S. Herman
2001, Journal of Hydrology (254) 47-66
Episodic streamwater transport of atrazine (a common agricultural herbicide) and nutrients has been observed throughout agricultural watersheds in the United States and poses a serious threat to the quality of its water resources. Catchment-scale atrazine and nutrient transport processes after agricultural application are still poorly understood, and predicting episodic streamwater...
Distributed shear of subglacial till due to Coulomb slip
Neal R. Iverson, Richard M. Iverson
2001, Journal of Glaciology (47) 481-488
In most models of the flow of glaciers on till beds, it has been assumed that till behaves as a viscoplastic fluid, despite contradictory evidence from laboratory studies. In accord with this assumption, displacement profiles measured in subglacial till have been fitted with viscoplastic models by estimating...
SHRIMP-RG U-Pb zircon geochronology of mesoproterozoic metamorphism and plutonism in the southwesternmost United States
Andrew P. Barth, Joseph L. Wooden, Drew S. Coleman
2001, Journal of Geology (109) 319-327
Mesoproterozoic intrusive and granulite‐grade metamorphic rocks in southern California have been inferred to be exotic to North America on the basis of perceived chronologic incompatibility with autochthonous cratonal rocks. Ion microprobe geochronology indicates that zircons in granulite‐grade gneisses, dated at 1.4 Ga using conventional methods, are composed of 1.68–1.80‐Ga cores...
Integrated surface and borehole strong-motion, soil-response arrays in San Francisco, California
Roger D. Borcherdt, H. P. Liu, R.E. Westerlund, Christopher M. Dietel, J. F. Gibbs, R. E. Warrick
M. Erdik, Mehmet Celebi, V. Mihailov, N. Apaydin, editor(s)
2001, Book chapter, Strong motion instrumentation for civil engineering structures
An integrated set of four borehole arrays and ten surface installations is installed in the city of San Francisco, California to measure the response of soft-soil deposits to strong earthquake ground motions. The borehole arrays extend through thick layers of softwater-saturated soils of Holocene age and older more consolidated soils...
Planetary geodesy and cartography at the USGS, Flagstaff: Moon, Mars, Venus, and beyond
Randolph L. Kirk, Mark R. Rosiek, Elpitha Howington-Kraus, Eric M. Eliason, Brent A. Archinal, Ella M. Lee
2001, Conference Paper, Proceedings of the XXth International Cartographic Conference
An important theme of our work is the synergistic use of a variety of geodetic, cartographic, and photogrammetric software packages. The USGS digital cartographic software system ISIS provides most of the processing capability needed for planimetric mapping tasks such as our revision of the global digital image mosaic of Mars...
New England wildlife: a model for ecosystem management -- ECORESEARCH
H.L. Short, J.B. Hestbeck, R.M. DeGraaf
2001, General Technical Report NE-283
History and management of crown-fire ecosystems: A summary and response
Jon E. Keeley, C. J. Fotheringham
2001, Conservation Biology (15) 1561-1567
Some ecosystems, such as yellow pine forests, have had a long history of frequent surface fires, but because of fire suppression policy, fires have been largely excluded from them during the last century (Covington 2000). Unnatural fuel accumulation in these forests has increased the potential for large, catastrophic crown fires,...
Pleurochrysis pseudoroscoffensis (Prymnesiophyceae) blooms on the surface of the Salton Sea, California
Kristen M. Reifel, M. P. McCoy, M. A. Tiffany, Tonie E. Rocke, Charles Trees, S. B. Barlow, D. J. Faulkner, S. H. Hurlbert
2001, Hydrobiologia (466) 177-185
Dense populations of the coccolithophore Pleurochrysis pseudoroscoffensis were found in surface films at several locations around the Salton Sea in February–August, 1999. An unidentified coccolithophorid was also found in low densities in earlier studies of the lake (1955–1956). To our knowledge, this is the first record of this widespread marine species in...
Sea otter studies in Glacier Bay National Park and Preserve: Aerial surveys, foraging observations, and intertidal clam sampling
James L. Bodkin, Kimberly A. Kloecker, George G. Esslinger, Daniel H. Monson, J.D. DeGroot
2001, Report
Following translocations to the outer coast of Southeast Alaska in 1965, sea otters have been expanding their range and increasing in abundance. We began conducting surveys for sea otters in Cross Sound, Icy Strait and Glacier Bay, Alaska in 1994, following initial reports of their presence in Glacier Bay in...
Population structure of Atlantic salmon (Salmo salar L.): A range-wide perspective from microsatellite DNA variation
T.L. King, S.T. Kalinowski, W. B. Schill, A.P. Spidle, B.A. Lubinski
2001, Molecular Ecology (10) 807-821
Atlantic salmon (n = 1682) from 27 anadromous river populations and two nonanadromous strains ranging from south-central Maine, USA to northern Spain were genotyped at 12 microsatellite DNA loci. This suite of moderate to highly polymorphic loci revealed 266 alleles (5–37/locus) range-wide. Statistically significant allelic and genotypic heterogeneity was observed across loci...
The fish community of a small impoundment in upstate New York
C. Mead McCoy III, Charles P. Madenjian, Jean V. Adams, Willard N. Harman
2001, Journal of Freshwater Ecology (16) 389-394
Moe Pond is a dimictic impoundment with surface area of 15.6 ha, a mean depth of 1.8 m, and an unexploited fish community of only two species: brown bullhead (Ameiurus nebulosus) and golden shiner (Notemigonus crysoleucas). The age-1 and older brown bullhead population was estimated to be 4,057 individuals, based...
Pesticides and amphibian declines in California, USA
Donald W. Sparling, Gary M. Fellers, Laura McConnell
2001, Environmental Toxicology and Chemistry (20) 1591-1595
Several species of anuran amphibians have undergone drastic population declines in the western United States over the last 10 to 15 years. In California, the most severe declines are in the Sierra Mountains east of the Central Valley and downwind of the intensely agricultural San Joaquin Valley. In contrast, coastal...
Immune status of free-ranging green turtles with fibropapillomatosis from Hawaii
Thierry M. Work, Robert Rameyer, George H. Balazs, Carolyn Cray, Sandra P. Chang
2001, Journal of Wildlife Diseases (37) 574-581
Cell-mediated and humoral immune status of free-ranging green turtles (Chelonia mydas) in Hawaii (USA) with and without fibropapillomatosis (FP) were assessed. Tumored and non-tumored turtles from Kaneohe Bay (KB) on the island of Oahu and from FP-free areas on the west (Kona/Kohala) coast of the island of Hawaii were sampled...
Fuel model selection for BEHAVE in midwestern oak savannas
K.W. Grabner, J.P. Dwyer, B.E. Cutter
2001, Northern Journal of Applied Forestry (18) 74-80
BEHAVE, a fire behavior prediction system, can be a useful tool for managing areas with prescribed fire. However, the proper choice of fuel models can be critical in developing management scenarios. BEHAVE predictions were evaluated using four standardized fuel models that partially described oak savanna fuel conditions: Fuel Model 1...
