Effects of dynamically variable saturation and matrix-conduit coupling of flow in karst aquifers
Thomas Reimann, T. Geyer, W.B. Shoemaker, R. Liedl, M. Sauter
2011, Water Resources Research (47)
Well-developed karst aquifers consist of highly conductive conduits and a relatively low permeability fractured and/or porous rock matrix and therefore behave as a dual-hydraulic system. Groundwater flow within highly permeable strata is rapid and transient and depends on local flow conditions, i.e., pressurized or nonpressurized flow. The characterization of karst...
Digital hydrologic networks supporting applications related to spatially referenced regression modeling
J. W. Brakebill, D.M. Wolock, S.E. Terziotti
2011, Journal of the American Water Resources Association (47) 916-932
Digital hydrologic networks depicting surface‐water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the...
Mid Holocene lake level and shoreline behavior during the Nipissing phase of the upper Great Lakes at Alpena, Michigan, USA
T.A. Thompson, K. Lepper, A.L. Endres, J.W. Johnston, S.J. Baedke, E.P. Argyilan, R.K. Booth, D.A. Wilcox
2011, Journal of Great Lakes Research (37) 567-576
The Nipissing phase was the last pre-modern high-water stage of the upper Great Lakes. Represented as either a one- or two-peak highstand, the Nipissing occurred following a long-term lake-level rise. This transgression was primarily an erosional event with only the final stage of the transgression preserved as barriers, spits, and strandplains...
Quantifying the influence of sea ice on ocean microseism using observations from the Bering Sea, Alaska
V.C. Tsai, D.E. McNamara
2011, Geophysical Research Letters (38)
Microseism is potentially affected by all processes that alter ocean wave heights. Because strong sea ice prevents large ocean waves from forming, sea ice can therefore significantly affect microseism amplitudes. Here we show that this link between sea ice and microseism is not only a robust one but can be...
A case study of alternative site response explanatory variables in Parkfield, California
E.M. Thompson, L.G. Baise, R. E. Kayen, E.C. Morgan, J. Kaklamanos
2011, Conference Paper, Geotechnical Special Publication
The combination of densely-spaced strong-motion stations in Parkfield, California, and spectral analysis of surface waves (SASW) profiles provides an ideal dataset for assessing the accuracy of different site response explanatory variables. We judge accuracy in terms of spatial coverage and correlation with observations. The performance of the alternative models is...
The contribution of competition to tree mortality in old-growth coniferous forests
A. Das, J. Battles, N.L. Stephenson, Phillip J. van Mantgem
2011, Forest Ecology and Management (261) 1203-1213
Competition is a well-documented contributor to tree mortality in temperate forests, with numerous studies documenting a relationship between tree death and the competitive environment. Models frequently rely on competition as the only non-random mechanism affecting tree mortality. However, for mature forests, competition may cease to be the primary driver...
Effects of environmental temperature on the dynamics of ichthyophoniasis in Juvenile Pacific Herring (Clupea pallasii)
J.L. Gregg, Johanna J. Vollenweider, C.A. Grady, R.A. Heintz, P.K. Hershberger
2011, Journal of Parasitology Research (2011)
The effects of temperature and infection by Ichthyophonus were examined in juvenile Pacific herring (Clupea pallasii) maintained under simulated overwinter fasting conditions. In addition to defining parameters for a herring bioenergetics model (discussed in Vollenweider et al. this issue), these experiments provided new insights into factors influencing the infectivity and...
Monitoring carnivore populations at the landscape scale: occupancy modelling of tigers from sign surveys
Kota Ullas Karanth, Arjun M. Gopalaswamy, Narayanarao Samba Kumar, Srinivas Vaidyanathan, James D. Nichols, Darryl I. MacKenzie
2011, Journal of Applied Ecology (48) 1048-1056
1. Assessing spatial distributions of threatened large carnivores at landscape scales poses formidable challenges because of their rarity and elusiveness. As a consequence of logistical constraints, investigators typically rely on sign surveys. Most survey methods, however, do not explicitly address the central problem of imperfect detections of animal signs in the...
Widespread inclination shallowing in Permian and Triassic paleomagnetic data from Laurentia: Support from new paleomagnetic data from Middle Permian shallow intrusions in southern Illinois (USA) and virtual geomagnetic pole distributions
M. Domeier, R. Van Der Voo, F.B. Denny
2011, Tectonophysics (511) 38-52
Recent paleomagnetic work has highlighted a common and shallow inclination bias in continental redbeds. The Permian and Triassic paleomagnetic records from Laurentia are almost entirely derived from such sedimentary rocks, so a pervasive inclination error will expectedly bias the apparent polar wander path of Laurentia in a significant way. The...
Surface complexation modeling for predicting solid phase arsenic concentrations in the sediments of the Mississippi River Valley alluvial aquifer, Arkansas, USA
M.S.U. Sharif, R.K. Davis, K.F. Steele, B. Kim, P.D. Hays, T.M. Kresse, J.A. Fazio
2011, Applied Geochemistry (26) 496-504
The potential health impact of As in drinking water supply systems in the Mississippi River Valley alluvial aquifer in the state of Arkansas, USA is significant. In this context it is important to understand the occurrence, distribution and mobilization of As in the Mississippi River Valley alluvial aquifer. Application of...
Methodology for quantifying uncertainty in coal assessments with an application to a Texas lignite deposit
Ricardo A. Olea, James A. Luppens, Susan J. Tewalt
2011, International Journal of Coal Geology (85) 78-90
A common practice for characterizing uncertainty in coal resource assessments has been the itemization of tonnage at the mining unit level and the classification of such units according to distance to drilling holes. Distance criteria, such as those used in U.S. Geological Survey Circular 891, are still widely used for public disclosure. A major deficiency...
Forecasting carbon budget under climate change and CO2 fertilization for subtropical region in China using integrated biosphere simulator (IBIS) model
Q. Zhu, H. Jiang, J. Liu, C. Peng, X. Fang, S. Yu, G. Zhou, X. Wei, W. Ju
2011, Polish Journal of Ecology (59) 3-24
The regional carbon budget of the climatic transition zone may be very sensitive to climate change and increasing atmospheric CO2 concentrations. This study simulated the carbon cycles under these changes using process-based ecosystem models. The Integrated Biosphere Simulator (IBIS), a Dynamic Global Vegetation Model (DGVM), was used to evaluate the...
Linking landscape characteristics to local grizzly bear abundance using multiple detection methods in a hierarchical model
T.A. Graves, Katherine C. Kendall, J. Andrew Royle, J.B. Stetz, A.C. Macleod
2011, Animal Conservation (14) 652-664
Few studies link habitat to grizzly bear Ursus arctos abundance and these have not accounted for the variation in detection or spatial autocorrelation. We collected and genotyped bear hair in and around Glacier National Park in northwestern Montana during the summer of 2000. We developed a hierarchical Markov chain Monte Carlo model...
Three-dimensional surface deformation mapping by convensional interferometry and multiple aperture interferometry
H.-S. Jung, Z. Lu, C.-W. Lee
2011, Conference Paper, 2011 3rd International Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2011
Interferometric synthetic aperture radar (InSAR) technique has been successfully used for mapping surface deformations [1-2], but it has been normally limited to a measurement along the radar line-of-sight (LOS) direction. For this reason, it is impossible to determine the north (N-S) component of surface deformation because of using data from...
Monitoring a large volume CO2 injection: Year two results from SECARB project at Denbury’s Cranfield, Mississippi, USA
Susan D. Hovorka, Timothy A. Meckel, Ramon H. Trevino, Jiemin Lu, Jean-Philippe Nicot, Jong-Won Choi, David Freeman, Paul Cook, Thomas M. Daley, Jonathan B. Ajo-Franklin, Barry M. Freifeild, Christine Doughty, Charles R. Carrigan, Doug La Brecque, Yousif K. Kharaka, James J. Thordsen, Tommy J. Phelps, Changbing Yang, Katherine D. Romanak, Tongwei Zhang, Robert M. Holt, Jeffery S. Lindler, Robert J. Butsch
2011, Energy Procedia (4) 3478-3485
The Southeast Regional Carbon Sequestration Partnership (SECARB) early project in western Mississippi has been testing monitoring tools and approaches to document storage efficiency and storage permanence under conditions of CO2 EOR as well as downdip injection into brine. Denbury Onshore LLC is host for the study and has brought a...
Process-based, morphodynamic hindcast of decadal deposition patterns in San Pablo Bay, California, 1856-1887
M. van der Wegen, B. E. Jaffe, J.A. Roelvink
2011, Journal of Geophysical Research F: Earth Surface (116)
This study investigates the possibility of hindcasting-observed decadal-scale morphologic change in San Pablo Bay, a subembayment of the San Francisco Estuary, California, USA, by means of a 3-D numerical model (Delft3D). The hindcast period, 1856-1887, is characterized by upstream hydraulic mining that resulted in a high sediment input to the...
Monitoring and inversion on land subsidence over mining area with InSAR technique
Y. Wang, Q. Zhang, C. Zhao, Z. Lu, X. Ding
2011, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The Wulanmulun town, located in Inner Mongolia, is one of the main mining areas of Shendong Company such as Shangwan coal mine and Bulianta coal mine, which has been suffering serious mine collapse with the underground mine withdrawal. We use ALOS/PALSAR data to extract land deformation under these regions, in...
Could residual oil from the Exxon Valdez spill create a long-term population "sink" for sea otters in Alaska?
Daniel H. Monson, Daniel F. Doak, Brenda E. Ballachey, James L. Bodkin
2011, Ecological Applications (21) 2917-2932
Over 20 years ago, the Exxon Valdez oil tanker spilled 42 million L of crude oil into the waters of Prince William Sound, Alaska, USA. At the time of the spill, the sea otter (Enhydra lutris) population inhabiting the spill area suffered substantial acute injuries and loss. Subsequent research has...
Vegetation index-based crop coefficients to estimate evapotranspiration by remote sensing in agricultural and natural ecosystems
E. P. Glenn, C. M. U. Neale, D.J. Hunsaker, P.L. Nagler
2011, Hydrological Processes (25) 4050-4062
Crop coefficients were developed to determine crop water needs based on the evapotranspiration (ET) of a reference crop under a given set of meteorological conditions. Starting in the 1980s, crop coefficients developed through lysimeter studies or set by expert opinion began to be supplemented by remotely sensed vegetation indices (VI)...
Response of non-native lake trout (Salvelinus namaycush) to 15 years of harvest in Yellowstone Lake, Yellowstone National Park
J.M. Syslo, C.S. Guy, P.E. Bigelow, P.D. Doepke, B.D. Ertel, T.M. Koel
2011, Canadian Journal of Fisheries and Aquatic Sciences (68) 2132-2145
Introduced lake trout (Salvelinus namaycush) threaten to extirpate native Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) in the 34 000 ha Yellowstone Lake in Yellowstone National Park, USA. Suppression (and eventual eradication) of the lake trout population is deemed necessary for the conservation of Yellowstone cutthroat trout. A US National Park...
Tracking solutes and water from subsurface drip irrigation application of coalbed methane-produced waters, Powder River Basin, Wyoming
Mark A. Engle, Carleton R. Bern, Richard W. Healy, J.I. Sams, J.W. Zupancic, K.T. Schroeder
2011, Environmental Geosciences (18) 169-187
One method to beneficially use water produced from coalbed methane (CBM) extraction is subsurface drip irrigation (SDI) of croplands. In SDI systems, treated CBM water (injectate) is supplied to the soil at depth, with the purpose of preventing the buildup of detrimental salts near the surface. The technology is...
Design of ecoregional monitoring in conservation areas of high-latitude ecosystems under contemporary climate change
Erik A. Beever, Andrea Woodward
2011, Biological Conservation (144) 1258-1269
Land ownership in Alaska includes a mosaic of federally managed units. Within its agency’s context, each unit has its own management strategy, authority, and resources of conservation concern, many of which are migratory animals. Though some units are geographically isolated, many are nevertheless linked by paths of abiotic and biotic...
Sexual difference in mercury concentrations of lake trout (Salvelinus namaycush) from Lake Ontario
C.P. Madenjian, M.J. Keir, D.M. Whittle
2011, Chemosphere (83) 903-908
We determined total mercury (Hg) concentrations in 50 female lake trout (Salvelinus namaycush) and 69 male lake trout from Lake Ontario (Ontario, Canada and New York, United States). Results showed that, on average, males were 8% higher in Hg concentration than females in Lake Ontario. We also used bioenergetics modeling...
A Comparison of seismic instrument noise coherence analysis techniques
A. T. Ringler, C. R. Hutt, J.R. Evans, L.D. Sandoval
2011, Bulletin of the Seismological Society of America (101) 558-567
The self-noise of a seismic instrument is a fundamental characteristic used to evaluate the quality of the instrument. It is important to be able to measure this self-noise robustly, to understand how differences among test configurations affect the tests, and to understand how different processing techniques and isolation methods (from...
Columbus crater and other possible groundwater-fed paleolakes of Terra Sirenum, Mars
J.J. Wray, R.E. Milliken, Colin M. Dundas, Gregg A. Swayze, J. C. Andrews-Hanna, A.M. Baldridge, M. Chojnacki, J.L. Bishop, B.L. Ehlmann, S.L. Murchie, Roger N. Clark, F.P. Seelos, L.L. Tornabene, S. W. Squyres
2011, Journal of Geophysical Research E: Planets (116)
Columbus crater in the Terra Sirenum region of the Martian southern highlands contains light‐toned layered deposits with interbedded sulfate and phyllosilicate minerals, a rare occurrence on Mars. Here we investigate in detail the morphology, thermophysical properties, mineralogy, and stratigraphy of these deposits; explore their regional context; and interpret the crater's...
