Analysis of hydromechanical well tests in fractured sedimentary rock at the NAWC site, New Jersey
L.C. Murdoch, D.B. Hisz, J.F. Ebenhack, D.E. Fowler, C. R. Tiedeman, L.N. Germanovich
2009, Conference Paper, 43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium
No abstract available....
Evaluating highly resolved paleoclimate records in the frequency domain for multidecadal-scale climate variability
Kristine L. DeLong, Terrence M. Quinn, Gary T. Mitchum, Richard Z. Poore
2009, Geophysical Research Letters (36)
[1] Do the chronological methods used in the construction of paleoclimate records influence the results of the frequency analysis applied to them? We explore this phenomenon using the Dongge Cave speleothem record (U-series chronology with variable time steps, Δt) and the El Malpais tree-ring index (cross-dating...
Composition and location of simulated lake-shore redds influence incubation success in kokanee, Oncorhynchus nerka
M.J. Fincel, S. R. Chipps, D.H. Bennett
2009, Fisheries Management and Ecology (16) 395-398
Methods for improving spawning habitat for lakeshore spawning kokanee, Oncorhynchus nerka (Walbaum), were explored by quantifying incubation success of embryos exposed to three substrate treatments in Lake Pend Oreille, Idaho, USA. Substrate treatments included no modification that used existing gravels in the lake (EXISTING), a cleaned substrate treatment where existing...
Angler awareness of aquatic nuisance species and potential transport mechanisms
K.K. Gates, C.S. Guy, A.V. Zale, T.B. Horton
2009, Fisheries Management and Ecology (16) 448-456
The role anglers play in transporting aquatic nuisance species (ANS) is important in managing infestations and preventing introductions. The objectives of this study were to: (1) quantify angler movement patterns in southwestern Montana, ANS awareness and equipment cleaning practices; and (2) quantify the amount of soil transported on boots and...
Composition and variation of noise recorded at the Yellowknife Seismic Array, 1991-2007
K.D. Koper, B. De Foy, H. Benz
2009, Journal of Geophysical Research B: Solid Earth (114)
We analyze seismic noise recorded on the 18 short-period, vertical component seismometers of the Yellowknife Seismic Array (YKA). YKA has an aperture of 23 km and is sited on cratonic lithosphere in an area with low cultural noise. These properties make it ideal for studying natural seismic noise at periods...
Social, political, and institutional setting: Water management problems of the Rio Grande
A. J. Douglas
2009, Journal of Water Resources Planning and Management (135) 493-501
This paper discusses various water management issues facing federal, state, and local agencies charged with managing the water resources of the Rio Grande River Basin and its major tributaries. The Rio Grande - 3,058 km (=1,900 mi) long - is the fourth longest river in the United States. The river's...
Stratigraphic controls on saltwater intrusion in the Dominguez Gap area of coastal Los Angeles
Brian D. Edwards, Kenneth D. Ehman, Daniel J. Ponti, Eric G. Reichard, John Tinsley, Robert J. Rosenbauer, Michael T. Land
2009, Special Paper of the Geological Society of America 375-395
The Los Angeles Basin is a densely populated coastal area that significantly depends on groundwater. A part of this groundwater supply is at risk from saltwater intrusion—the impetus for this study. High-resolution seismic-reflection data collected from the Los Angeles–Long Beach Harbor Complex have been combined with borehole geophysical and descriptive...
Coarse-grained sediment delivery and distribution in the Holocene Santa Monica Basin, California: Implications for evaluating source-to-sink flux at millennial time scales
B.W. Romans, W. R. Normark, M.M. McGann, J.A. Covault, S.A. Graham
2009, Geological Society of America Bulletin (121) 1394-1408
Utilizing accumulations of coarse-grained terrigenous sediment from deep-marine basins to evaluate the relative contributions of and history of controls on sediment flux through a source-to-sink system has been difficult as a result of limited knowledge of event timing. In this study, six new radiocarbon (14C) dates are integrated with five...
Experimental study of near-field air entrainment by subsonic volcanic jets
Stephen A. Solovitz, Larry G. Mastin
2009, Journal of Geophysical Research B: Solid Earth (114) 1-9
The flow structure in the developing region of a turbulent jet has been examined using particle image velocimetry methods, considering the flow at steady state conditions. The velocity fields were integrated to determine the ratio of the entrained air speed to the jet speed, which was approximately 0.03 for a...
Using packrat middens to assess grazing effects on vegetation change
J. Fisher, K.L. Cole, R. Scott Anderson
2009, Journal of Arid Environments (73) 937-948
Research on grazing effects usually compares the same sites through time or grazed and ungrazed sites over the same time period. Both approaches are complicated in arid environments where grazing can have a long undocumented history and landscapes can be spatially heterogenous. This work employs both approaches simultaneously by comparing...
Disturbance alters local-regional richness relationships in appalachian forests
R.T. Belote, N.J. Sanders, R.H. Jones
2009, Ecology (90) 2940-2947
Whether biological diversity within communities is limited by local interactions or regional species pools remains an important question in ecology. In this paper, we investigate how an experimentally applied tree-harvesting disturbance gradient influenced local-regional richness relationships. Plant species richness was measured at three spatial scales (2 ha = regional; 576...
Diurnal stream habitat use of juvenile Atlantic salmon, brown trout and rainbow trout in winter
J. H. Johnson, K.A. Douglass
2009, Fisheries Management and Ecology (16) 352-359
The diurnal winter habitat of three species of juvenile salmonids was examined in a tributary of Skaneateles Lake, NY to compare habitat differences among species and to determine if species/age classes were selecting specific habitats. A total of 792 observations were made on the depth, velocity, substrate and cover (amount...
Relative abundance and species richness of cerambycid beetles in partial cut and uncut bottomland hardwood forests
P. Newell, S. King
2009, Canadian Journal of Forest Research (39) 2100-2108
Partial cutting techniques are increasingly advocated and used to create habitat for priority wildlife. However, partial cutting may or may not benefit species dependent on deadwood; harvesting can supplement coarse woody debris in the form of logging slash, but standing dead trees may be targeted for removal. We sampled cerambycid...
Nutrient availability and phytoplankton nutrient limitation across a gradient of atmospheric nitrogen deposition
J.J. Elser, M. Kyle, L. Steuer, K. R. Nydick, Jill Baron
2009, Ecology (90) 3062-3073
Atmospheric nitrogen (N) deposition to lakes and watersheds has been increasing steadily due to various anthropogenic activities. Because such anthropogenic N is widely distributed, even lakes relatively removed from direct human disturbance are potentially impacted. However, the effects of increased atmospheric N deposition on lakes are not well documented, We...
Genetic and serological typing of European infectious haematopoietic necrosis virus (IHNV) isolates
T. Johansson, K. Einer-Jensen, W. Batts, P. Ahrens, C. Bjorkblom, Gael Kurath, H. Bjorklund, N. Lorenzen
2009, Diseases of Aquatic Organisms (86) 213-221
Infectious haematopoietic necrosis virus (IHNV) causes the lethal disease infectious haematopoietic necrosis (IHN) in juvenile salmon and trout. The nucleocapsid (N) protein gene and partial glycoprotein (G) gene (nucleotides 457 to 1061) of the European isolates IT-217A, FR-32/87, DE-DF 13/98 11621, DE-DF 4/99-8/99, AU-9695338 and RU-FR1 were sequenced and compared...
The Reocín zinc-lead deposit, Spain: paleomagnetic dating of a late Tertiary ore body
David T. A. Symons, Michael T. Lewchuk, Kazuo Kawasaki, Francisco Velasco, David L. Leach
2009, Mineralium Deposita (44) 867-880
The Reocín mine in northern Spain’s Basque–Cantabrian basin exploited a world-class Mississippi Valley-type Zn–Pb deposit. Its epigenetic mineralization is in Urgonian 116 ± 1 Ma dolomitized limestones of the Santillana syncline, which was formed by Oligocene and mid Miocene pulses of the Pyrenean orogeny. Paleomagnetic results (22 sites, 274 specimens) in mineralization isolated...
Seasonal-scale nearshore morphological evolution: Field observations and numerical modeling
P. Ruggiero, D.-J.R. Walstra, G. Gelfenbaum, Ormondt M. van
2009, Coastal Engineering (56) 1153-1172
A coupled waves-currents-bathymetric evolution model (DELFT-3D) is compared with field measurements to test hypotheses regarding the processes responsible for alongshore varying nearshore morphological changes at seasonal time scales. A 2001 field experiment, along the beaches adjacent to Grays Harbor, Washington, USA, captured the transition between the high-energy erosive conditions of...
Contributions of vital rates to growth of a protected population of American black bears
M.S. Mitchell, L.B. Pacifici, J.B. Grand, R. A. Powell
2009, Ursus (20) 77-84
Analyses of large, long-lived animals suggest that adult survival generally has the potential to contribute more than reproduction to population growth rate (λ), but because survival varies little, high variability in reproduction can have a greater influence. This pattern has been documented for several species...
Distributed geospatial model sharing based on open interoperability standards
Min Feng, Shuguang Liu, Ned H. Euliss Jr., Yin Fang
2009, Journal of Remote Sensing (13) 1060-1066
Numerous geospatial computational models have been developed based on sound principles and published in journals or presented in conferences. However modelers have made few advances in the development of computable modules that facilitate sharing during model development or utilization. Constraints hampering development of model sharing technology includes limitations on computing,...
On constraining pilot point calibration with regularization in PEST
M.N. Fienen, C.T. Muffels, R. J. Hunt
2009, Ground Water (47) 835-844
Ground water model calibration has made great advances in recent years with practical tools such as PEST being instrumental for making the latest techniques available to practitioners. As models and calibration tools get more sophisticated, however, the power of these tools can be misapplied, resulting in poor parameter estimates and/or...
Estuarine Ecology of Juvenile Salmon in Western Alaska: a Review
Christian E. Zimmerman, Nicola Hillgruber
2009, Book chapter, American Fisheries Society Symposium
In the late 1990s and early 2000s, large declines in numbers of chum salmon Oncorhynchus keta and Chinook salmon O. tshawytscha returning to the Arctic-YukonKuskokwim (AYK) region (Alaska, USA) illuminated the need for an improved understanding of the variables controlling salmon abundance at all life stages. In addressing questions about...
Geodetically inferred coseismic and postseismic slip due to the M 5.4 31 October 2007 Alum Rock earthquake
J. R. Murray-Moraleda, R.W. Simpson
2009, Bulletin of the Seismological Society of America (99) 2784-2800
On 31 October 2007 the M 5.4 Alum Rock earthquake occurred near the junction between the Hayward and Calaveras faults in the San Francisco Bay Area, producing coseismic and postseismic displacements recorded by 10 continuously operating Global Positioning System (GPS) instruments. The cumulative postseismic displacements over the four months following...
Interannual variation of carbon fluxes from three contrasting evergreen forests: The role of forest dynamics and climate
C.A. Sierra, H.W. Loescher, M. E. Harmon, A.D. Richardson, D.Y. Hollinger, S.S. Perakis
2009, Ecology (90) 2711-2723
Interannual variation of carbon fluxes can be attributed to a number of biotic and abiotic controls that operate at different spatial and temporal scales. Type and frequency of disturbance, forest dynamics, and climate regimes are important sources of variability. Assessing the variability of carbon fluxes from these specific sources can...
Effects of past logging and grazing on understory plant communities in a montane Colorado forest
P.J. Fornwalt, M. R. Kaufmann, L. S. Huckaby, T.J. Stohlgren
2009, Plant Ecology (203) 99-109
Throughout Pinus ponderosa-Pseudotsuga menziesii forests of the southern Colorado Front Range, USA, intense logging and domestic grazing began at the time of Euro-American settlement in the late 1800s and continued until the early 1900s. We investigated the long-term impacts of these settlement-era activities on understory plant communities by comparing understory...
Geographic relatedness and predictability of Escherichia coli along a peninsular beach complex of Lake Michigan
M.B. Nevers, D.A. Shively, G.T. Kleinheinz, C.M. McDermott, W. Schuster, V. Chomeau, R.L. Whitman
2009, Journal of Environmental Quality (38) 2357-2364
To determine more accurately the real-time concentration of fecal indicator bacteria (FIB) in beach water, predictive modeling has been applied in several locations around the Great Lakes to individual or small groups of similar beaches. Using 24 beaches in Door County, Wisconsin, we attempted to expand predictive models to multiple...
