Aerial rapid assessment of hurricane damages to northern Gulf coastal habitats
Thomas C. Michot, Christopher J. Wells, Paul C. Chadwick
2007, Circular 1306-5A
Hurricane Katrina made landfall in southeast Louisiana on August 29, 2005, and Hurricane Rita made landfall in southwest Louisiana on September 24, 2005. Scientists from the U.S. Geological Survey (USGS) flew aerial surveys to assess damages to natural resources and to lands owned and managed by the U.S. Department of...
Heterogeneity of soil nutrients and subsurface biota in a dryland ecosystem
D.C. Housman, C.M. Yeager, B.J. Darby, R.L. Sanford Jr., C.R. Kuske, D.A. Neher, J. Belnap
2007, Soil Biology and Biochemistry (39) 2138-2149
Dryland ecosystems have long been considered to have a highly heterogeneous distribution of nutrients and soil biota, with greater concentrations of both in soils under plants relative to interspace soils. We examined the distribution of soil resources in two plant communities (dominated by either the shrub Coleogyne ramosissima or the...
USGS Rocky Mountain Geographic Science Center’s 2005 hurricane response and recovery activities
Jill J. Cress, Susan E. Goplen, Jeff L. Sloan, Jennifer L. Stefanacci, Stanley R. Wilds
2007, Circular 1306-4A
Sophisticated monitoring systems and analysis products were key components to emergency response and Federal recovery activities during the 2005 hurricane season. The U.S. Geological Survey's (USGS) Rocky Mountain Geographic Science Center worked with a number of Federal agencies to provide these types of near real-time geospatial monitoring systems and analysis...
Nitrous oxide fluxes from cultivated areas and rangeland: U.S. High Plains
Edwin P. Weeks, Peter B. McMahon
2007, Vadose Zone Journal (6) 496-510
Concentration profiles of N2O, a greenhouse gas, and the conservative trace gases SF6 and the chlorofluorocarbons CFC-11, CFC-12, CFC-113, and were measured periodically through thick vadose zones at nine sites in the U.S. High Plains. The CFC and SF6 measurements were used to calibrate a one-dimensional gas diffusion model, using...
The Penokean orogeny in the Lake Superior region
K. J. Schulz, W.F. Cannon
2007, Precambrian Research (157) 4-25
The Penokean orogeny began at about 1880 Ma when an oceanic arc, now the Pembine-Wausau terrane, collided with the southern margin of the Archean Superior craton marking the end of a period of south-directed subduction. The docking of the buoyant craton to the arc resulted in a subduction jump to...
Two-dimensional surface river flow patterns measured with paired RiverSondes
C.C. Teague, D.E. Barrick, P.M. Lilleboe, R. T. Cheng
2007, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
Two RiverSondes were operated simultaneously in close proximity in order to provide a two-dimensional map of river surface velocity. The initial test was carried out at Threemile Slough in central California. The two radars were installed about 135 m apart on the same bank of the channel. Each radar used...
Amphibian, reptilian, and avian remains from the Fox Hills Formation (Maastrichtian): Shoreline and estuarine deposits of the Pierre Sea in south-central North Dakota
J.W. Hoganson, J.M. Erickson, F.D. Holland Jr.
2007, Special Paper of the Geological Society of America 239-256
Although vertebrate fossils, except for fish, are not common in the Maastrichtian Fox Hills Formation, amphibian, reptilian, and avian remains have been recovered at several localities in south-central North Dakota from shoreline facies of the retreating Pierre-Fox Hills seaway. This mixed fauna of aquatic, terrestrial, and marine taxa provides insight...
Crustal structure of the Alaska Range orogen and Denali fault along the Richardson Highway
M. A. Fisher, L. Pellerin, W. J. Nokleberg, N. A. Ratchkovski, J.M.G. Glen
2007, Special Paper of the Geological Society of America 43-53
A suite of geophysical data obtained along the Richardson Highway crosses the eastern Alaska Range and Denali fault and reveals the crustal structure of the orogen. Strong seismic reflections from within the orogen north of the Denali fault dip as steeply as 25° north and extend...
Welcome to the National Wetlands Research Center Library: Successful Research Begins @ Your Library
Linda Broussard
2007, Fact Sheet 2007-3033
The National Wetlands Research Center (NWRC) library is part of the U.S. Geological Survey (USGS) and is the only USGS library dedicated to wetland science. The mission of the NWRC library is to support the research and information needs of scientists, managers, and support personnel by providing a specialized, scientific...
The Pennsylvanian-early permian bird spring carbonate shelf, Southeastern California: Fusulinid biostratigraphy, paleogeographic evolution, and tectonic implications
C.H. Stevens, P. Stone
2007, Special Paper of the Geological Society of America (429) 1-82
The Bird Spring Shelf in southeastern California, along with coeval turbidite basins to the west, records a complex history of late Paleozoic sedimentation, sea-level changes, and deformation along the western North American continental margin. We herein establish detailed correlations between deposits of the shelf and the flanking basins, which we...
Integrating observation and statistical forecasts over sub-Saharan Africa to support Famine Early Warning
Chris Funk, James P. Verdin, Gregory Husak
2007, Conference Paper, 87th American Meteorological Society annual meeting
Famine early warning in Africa presents unique challenges and rewards. Hydrologic extremes must be tracked and anticipated over complex and changing climate regimes. The successful anticipation and interpretation of hydrologic shocks can initiate effective government response, saving lives and softening the impacts of droughts and floods. While both monitoring and...
The restricted gemuk group: A triassic to lower cretaceous succession in southwestern Alaska
Marti L. Miller, D. C. Bradley, T. K. Bundtzen, R. B. Blodgett, E.A. Pessagno Jr., R. D. Tucker, A. G. Harris
2007, Special Paper of the Geological Society of America 273-305
New data from an Upper Triassic to Lower Cretaceous deep marine succession-the herein reinstated and restricted Gemuk Group-provide a vital piece of the puzzle for unraveling southwestern Alaska's tectonic history. First defined by Cady et al. in 1955, the Gemuk Group soon became a regional catchall unit that ended up...
Detrital zircon geochronology of some neoproterozoic to triassic rocks in interior Alaska
D. C. Bradley, W.C. McClelland, J. L. Wooden, A.B. Till, S. M. Roeske, Marti L. Miller, Susan M. Karl, J.G. Abbott
2007, Special Paper of the Geological Society of America 155-189
No abstract available. ...
Hydrology and Flood Profiles of Duck Creek and Jordan Creek Downstream from Egan Drive, Juneau, Alaska
Janet H. Curran
2007, Scientific Investigations Report 2006-5323
Hydrologic and hydraulic updates for Duck Creek and the lower part of Jordan Creek in Juneau, Alaska, included computation of new estimates of peak streamflow magnitudes and new water-surface profiles for the 10-, 50-, 100-, and 500-year floods. Computations for the 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year...
The geophysical character of southern Alaska - Implications for crustal evolution
R. W. Saltus, T. L. Hudson, Frederic H. Wilson
2007, Special Paper of the Geological Society of America (431) 1-20
The southern Alaska continental margin has undergone a long and complicated history of plate convergence, subduction, accretion, and margin-parallel displacements. The crustal character of this continental margin is discernible through combined analysis of aeromagnetic and gravity data with key constraints from previous seismic interpretation. Regional magnetic data are particularly useful...
Propagation of the Hawaiian-Emperor volcano chain by Pacific plate cooling stress
W.D. Stuart, G.R. Foulger, M. Barall
2007, Special Paper of the Geological Society of America (430) 497-506
The lithosphere crack model, the main alternative to the mantle plume model for age-progressive magma emplacement along the Hawaiian-Emperor volcano chain, requires the maximum horizontal tensile stress to be normal to the volcano chain. However, published stress fields calculated from Pacific lithosphere tractions and body forces...
Prevalence and distribution of pox-like lesions, avian malaria, and mosquito vectors in Kipahulu valley, Haleakala National Park, Hawai'i, USA
Samuel Aruch, Carter T. Atkinson, Amy F. Savage, Dennis LaPointe
2007, Journal of Wildlife Diseases (43) 567-575
We determined prevalence and altitudinal distribution of introduced avian malarial infections (Plasmodium relictum) and pox-like lesions (Avipoxvirus) in forest birds from Kīpahulu Valley, Haleakalā National Park, on the island of Maui, and we identified primary larval habitat for the mosquito vector of this disease. This intensively managed wilderness area and...
USGS advances in integrated, high-resolution sea-floor mapping: inner continental shelf to estuaries
J. F. Denny, W. C. Schwab, D.C. Twichell, T.F. O’Brien, W. W. Danforth, D.S. Foster, E. Bergeron, C.W. Worley, B.J. Irwin, B. Butman, P. C. Valentine, W. E. Baldwin, R.A. Morton, E.R. Thieler, D.R. Nichols, B.D. Andrews
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
The U.S. Geological Survey (USGS) has been involved in geological mapping of the sea floor for the past thirty years. Early geophysical and acoustic mapping efforts using GLORIA (Geologic LOng Range Inclined ASDIC) a long-range sidescan-sonar system, provided broad-scale imagery of deep waters within the U.S. Exclusive Economic Zone (EEZ)....
Soil nutrients influence spatial distributions of tropical trees species
R. John, J.W. Dalling, K.E. Harms, J.B. Yavitt, R.F. Stallard, M. Mirabello, S.P. Hubbell, R. Valencia, H. Navarrete, M. Vallejo, R.B. Foster
2007, Proceedings of the National Academy of Sciences of the United States of America (104) 864-869
The importance of niche vs. neutral assembly mechanisms in structuring tropical tree communities remains an important unsettled question in community ecology [Bell G (2005) Ecology 86:1757-1770]. There is ample evidence that species distributions are determined by soils and habitat factors at landscape (<104 km2) and regional scales. At local scales...
Possible refugia in the Alexander Archipelago of southeastern Alaska during the late Wisconsin glaciation
P. E. Carrara, T. A. Ager, J.F. Baichtal
2007, Canadian Journal of Earth Sciences (44) 229-244
The interpretation of the extent of late Wisconsin glaciation in southeastern Alaska has varied between geologists and biologists. Maps and reports of the region prepared by geologists commonly indicated that late Wisconsin ice extended as a large uniform front west to the edge of the continental shelf. However, the distribution...
Ground-penetrating radar: A tool for monitoring bridge scour
N.L. Anderson, A.M. Ismael, T. Thitimakorn
2007, Environmental & Engineering Geoscience (13) 1-10
Ground-penetrating radar (GPR) data were acquired across shallow streams and/or drainage ditches at 10 bridge sites in Missouri by maneuvering the antennae across the surface of the water and riverbank from the bridge deck, manually or by boat. The acquired two-dimensional and three-dimensional data sets accurately image the channel bottom,...
Regional beach/cliff system dynamics along the california coast
C.J. Hapke, Don Reid
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
The coast of California is comprised of both sandy shorelines and cliffed coastline, and in many areas these features spatially coincide. In order to better understand the regional trends of change along the California coast, the U.S. Geological Survey is quantifying both sandy shoreline change and coastal cliff retreat for...
A rapid compatibility analysis of potential offshore sand sources for beaches of the Santa Barbara Littoral Cell
N. Mustain, G. Griggs, P.L. Barnard
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
The beaches of the Santa Barbara Littoral Cell, which are narrow as a result of either natural and/or anthropogenic factors, may benefit from nourishment. Sand compatibility is fundamental to beach nourishment success and grain size is the parameter often used to evaluate equivalence. Only after understanding which sand sizes naturally...
Modelingevapotranspirationina sub-tropical climate
M.R. Savabi, T.A. Cochrane, E. German, C. Ikiz, N. Cockshutt
2007, Journal of Environmental Hydrology (15) 1-15
Evapotranspiration (ET) loss is estimated at about 80-85% of annual precipitation in South Florida. Accurate prediction of ET is important during and beyond the implementation of the Comprehensive Everglades Restoration Plan (CERP). In the USDA's Everglades Agro-Hydrology Model (EAHM) the soil water intake is linked with the soil water redistribution,...
Surface drifter derived circulation in the northern and middle Adriatic Sea: Response to wind regime and season
L. Ursella, P.-M. Poulain, R. P. Signell
2007, Journal of Geophysical Research C: Oceans (112)
More than 120 satellite-tracked drifters were deployed in the northern and middle Adriatic (NMA) Sea between September 2002 and November 2003, with the purpose of studying the surface circulation at mesoscale to seasonal scale in relation to wind forcing, river runoff, and bottom topography. Pseudo-Eulerian and Lagrangian statistics were calculated...
