Effect of dietary salt on migration and survival of yearling steelhead produced at Iron Gate Hatchery, Klamath River, 2009
S. Juhnke, H. Hansel, Katrina Wright Katrina, N. Hetrick N.
2011, Report
We surgically implanted radio transmitters into 30 hatchery yearling steelhead (Oncorhynchus mykiss) released from Iron Gate Hatchery during the spring of 2009 to improve our understanding of the effect of dietary salt on their out-migration and survival. Steelhead yearlings were divided into two feed treatments to test the efficacy of...
Beach monitoring criteria: reading the fine print
Meredith B. Nevers, Richard L. Whitman
2011, Environmental Science & Technology (45) 10315-10321
Beach monitoring programs aim to decrease swimming-related illnesses resulting from exposure to harmful microbes in recreational waters, while providing maximum beach access. Managers are advised by the U.S. EPA to estimate microbiological water quality based on a 5-day geometric mean of fecal indicator bacteria (FIB) concentrations or on a jurisdiction-specific...
Parallelization of GeoClaw code for modeling geophysical flows with adaptive mesh refinement on many-core systems
S. Zhang, D.A. Yuen, A. Zhu, S. Song, David L. George
2011, Conference Paper, 14th IEEE Int. Conf. on Computational Science and Engineering, CSE 2011 and 11th Int. Symp. on Pervasive Systems, Algorithms, and Networks, I-SPA 2011 and 10th IEEE Int. Conf. on IUCC 2011
We parallelized the GeoClaw code on one-level grid using OpenMP in March, 2011 to meet the urgent need of simulating tsunami waves at near-shore from Tohoku 2011 and achieved over 75% of the potential speed-up on an eight core Dell Precision T7500 workstation [1]. After submitting that work to SC11...
Absence of remotely triggered large earthquakes beyond the mainshock region
T. Parsons, A.A. Velasco
2011, Nature Geoscience (4) 312-316
Large earthquakes are known to trigger earthquakes elsewhere. Damaging large aftershocks occur close to the mainshock and microearthquakes are triggered by passing seismic waves at significant distances from the mainshock. It is unclear, however, whether bigger, more damaging earthquakes are routinely triggered at distances far from the mainshock, heightening the...
Ultramafic-derived arsenic in a fractured bedrock aquifer
P.C. Ryan, J. Kim, A.J. Wall, J.C. Moen, L.G. Corenthal, D.R. Chow, C.M. Sullivan, K.S. Bright
2011, Applied Geochemistry (26) 444-457
In the fractured bedrock aquifer of northern Vermont, USA, As concentrations in groundwater range from <1 to 327??g/L (<13-4360nm/L) and these elevated occurrences have a general spatial association with ultramafic rock bodies. The ultramafic rocks in this region are comprised mainly of serpentinites and talc-magnesite rocks with average As concentration...
Concluding remarks: The way forward for urban ecology
J. Niemela, J.H. Breuste, Thomas Elmqvist, Glenn R. Guntenspergen, P. James, N.E. McIntyre
J. Niemela, J.H. Breuste, T. Elmqvist, Glenn R. Guntenspergen, P. James, N.E. McIntyre, editor(s)
2011, Book chapter, Urban ecology: Patterns, processes, and applications
No abstract available....
What's new in well logging and formation evaluation
S. Prensky
2011, World Oil (232) 85-95
A number of significant new developments is emerging in well logging and formation evaluation. Some of the new developments include an ultrasonic wireline imager, an electromagnetic free-point indicator, wired and fiber-optic coiled tubing systems, and extreme-temperature logging-while-drilling (LWD) tools. The continued consolidation of logging and petrophysical service providers in 2010...
Characteristics, distribution, origin, and significance of opaline silica observed by the Spirit rover in Gusev crater, Mars
S. W. Ruff, J.D. Farmer, W. M. Calvin, Kenneth E. Herkenhoff, J. R. Johnson, R.V. Morris, M.S. Rice, R. E. Arvidson, J.F. Bell III, P. R. Christensen, S. W. Squyres
2011, Journal of Geophysical Research E: Planets (116)
The presence of outcrops and soil (regolith) rich in opaline silica (∼65–92 wt % SiO2) in association with volcanic materials adjacent to the “Home Plate” feature in Gusev crater is evidence for hydrothermal conditions. The Spirit rover has supplied a diverse set of observations that are used here to better...
Estimating surface faulting impacts from the shakeout scenario earthquake
J.A. Treiman, D.J. Pontib
2011, Earthquake Spectra (27) 315-330
An earthquake scenario, based on a kinematic rupture model, has been prepared for a Mw 7.8 earthquake on the southern San Andreas Fault. The rupture distribution, in the context of other historic large earthquakes, is judged reasonable for the purposes of this scenario. This model is used as the basis...
The effects of myxobolus cerebralis on the physiological performance of whirling disease resistant and susceptible strains of rainbow trout
E.R. Fetherman, Christopher A. Myrick, D.L. Winkelman, G.J. Schisler
2011, Journal of Aquatic Animal Health (23) 169-177
The development of rainbow trout Oncorhynchus mykiss strains that are resistant to whirling disease has shown promise as amanagement tool for populationsin areas where Myxobolus cerebralisis present. However, the physiological effects of the disease on characteristics necessary for fish survival in natural river conditions have not been tested in many...
Probabilistic fault displacement hazards for the southern san andreas fault using scenarios and empirical slips
R. Chen, M.D. Petersen
2011, Earthquake Spectra (27) 293-313
We apply a probabilistic method to develop fault displacement hazard maps and profiles for the southern San Andreas Fault. Two slip models are applied: (1) scenario slip, defined by the ShakeOut rupture model, and (2) empirical slip, calculated using regression equations relating global slip to earthquake magnitude and distance along...
Development of a depth-integrated sample arm to reduce solids stratification bias in stormwater sampling
W.R. Selbig, R.T. Bannerman
2011, Water Environment Research (83) 347-357
A new depth-integrated sample arm (DISA) was developed to improve the representation of solids in stormwater, both organic and inorganic, by collecting a water quality sample from multiple points in the water column. Data from this study demonstrate the idea of vertical stratification of solids in storm sewer runoff. Concentrations...
Managed flood effects on beaver pond habitat in a desert riverine ecosystem, bill williams river, Arizona USA
D.C. Andersen, P.B. Shafroth, C.M. Pritekel, M. W. O’Neill
2011, Wetlands (31) 195-206
The ecological effects of beaver in warm-desert streams are poorly documented, but potentially significant. For example, stream water and sediment budgets may be affected by increased evaporative losses and sediment retention in beaver ponds. We measured physical attributes of beaver pond and adjacent lotic habitats on a regulated Sonoran Desert...
Tsunami modelling with adaptively refined finite volume methods
R.J. LeVeque, D.L. George, M.J. Berger
2011, Acta Numerica (20) 211-289
Numerical modelling of transoceanic tsunami propagation, together with the detailed modelling of inundation of small-scale coastal regions, poses a number of algorithmic challenges. The depth-averaged shallow water equations can be used to reduce this to a time-dependent problem in two space dimensions, but even so it is crucial to use...
Survival of white-tailed deer neonates in Minnesota and South Dakota
T.W. Grovenburg, C. C. Swanson, C.N. Jacques, R. W. Klaver, T.J. Brinkman, B.M. Burris, C.S. Deperno, J.A. Jenks
2011, Journal of Wildlife Management (75) 213-220
Understanding the influence of intrinsic (e.g., age, birth mass, and sex) and habitat factors on survival of neonate white-tailed deer improves understanding of population ecology. During 2002–2004, we captured and radiocollared 78 neonates in eastern South Dakota and southwestern Minnesota, of which 16 died before 1 September. Predation accounted for...
Fire tolerance of a resprouting Artemisia (Asteraceae) shrub
S.L. Winter, S.D. Fuhlendorf, C.L. Goad, C.A. Davis, K.R. Hickman, David M. Leslie Jr.
2011, Plant Ecology (212) 2085-2094
In North America, most Artemisia (Asteraceae) shrub species lack the ability to resprout after disturbances that remove aboveground biomass. We studied the response of one of the few resprouting Artemisia shrubs, Artemisia filifolia (sand sagebrush), to the effects of prescribed fires. We collected data on A. filifolia density and structural...
Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method
Wu-Cheng Chi, W.H.K. Lee, J.A.D. Aston, C.J. Lin, C.-C. Liu
2011, Bulletin of the Seismological Society of America (101) 3105-3109
We develop a new way to invert 2D translational waveforms using Jaeger's (1969) formula to derive rotational ground motions about one axis and estimate the errors in them using techniques from statistical multivariate analysis. This procedure can be used to derive rotational ground motions and strains using arrayed translational data,...
Measurements of Martian dust devil winds with HiRISE
D.S. Choi, Colin M. Dundas
2011, Geophysical Research Letters (38)
We report wind measurements within Martian dust devils observed in plan view from the High Resolution Imaging Science Experiment (HiRISE) orbiting Mars. The central color swath of the HiRISE instrument has three separate charge‐coupled devices (CCDs) and color filters that observe the surface in rapid cadence. Active features, such as...
Methods of InSAR atmosphere correction for volcano activity monitoring
W. Gong, F. Meyer, P.W. Webley, Z. Lu
2011, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
When a Synthetic Aperture Radar (SAR) signal propagates through the atmosphere on its path to and from the sensor, it is inevitably affected by atmospheric effects. In particular, the applicability and accuracy of Interferometric SAR (InSAR) techniques for volcano monitoring is limited by atmospheric path delays. Therefore, atmospheric correction of...
U.S. Geological Survey: A synopsis of Three-dimensional Modeling
Linda J. Jacobsen, Pierre D. Glynn, Geoff A. Phelps, Randall C. Orndorff, Gerald W. Bawden, V. J. S. Grauch
2011, Book chapter, Chapter 13 in <i>Synopsis of Current Three-dimensional Geological Mapping and Modeling in Geological Survey Organizations</i>
The U.S. Geological Survey (USGS) is a multidisciplinary agency that provides assessments of natural resources (geological, hydrological, biological), the disturbances that affect those resources, and the disturbances that affect the built environment, natural landscapes, and human society. Until now, USGS map products have been generated and distributed primarily as 2-D...
GAGES-II: Geospatial Attributes of Gages for Evaluating Streamflow
James A. Falcone
2011, Report
This dataset, termed "GAGES II", an acronym for Geospatial Attributes of Gages for Evaluating Streamflow, version II, provides geospatial data and classifications for 9,322 stream gages maintained by the U.S. Geological Survey (USGS). It is an update to the original GAGES, which was published as a Data Paper on the...
Normalized Difference Vegetation Index for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the Normalized Difference Vegetation Index...
W is for weathered rock
W. H. Langer
2011, Aggregates Manager (16)
Marine Habitat Use by Anadromous Bull Trout from the Skagit River, Washington
Michael C. Hayes, Steve P. Rubin, Reginald Reisenbichler, Fred A. Goetz, Eric Jeanes, Aundrea McBride
2011, Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science (3) 394-410
Acoustic telemetry was used to describe fish positions and marine habitat use by tagged bull trout Salvelinus confluentus from the Skagit River, Washington. In March and April 2006, 20 fish were captured and tagged in the lower Skagit River, while 15 fish from the Swinomish Channel were tagged during May...
Effects of harvest and climate on population dynamics of northern bobwhites in south Florida
V. Rolland, J.A. Hostetler, T.C. Hines, Fred A. Johnson, H. Franklin Percival, M.K. Oli
2011, Wildlife Research (38) 396-407
Context: Hunting-related (hereafter harvest) mortality is assumed to be compensatory in many exploited species. However, when harvest mortality is additive, hunting can lead to population declines, especially on public land where hunting pressure can be intense. Recent studies indicate that excessive hunting may have contributed to the decline of a northern...
