Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
Filter Total Items: 5346
Numerical modelling of geothermal and reflux circulation in Enewetak Atoll: Implications for dolomitization
Two types of regional-scale seawater circulation have been proposed to explain the formation of Enewetak Atoll dolomites: geothermal and reflux circulation. We have used a finite element groundwater flow model to examine the pattern, magnitude and dynamic interaction of these two different circulation mechanisms in Enewetak Atoll. Geothermal circulation is concentrated around the atoll-margin wher
Authors
G. Jones, F. Whitaker, P. Smart, W. Sanford
Observed changes in early mortality syndrome in Lake Michigan coho and chinook salmon from 1994-1999
No abstract available at this time
Authors
J. Hnath, M. Wolgamood, S.V. Marcquenski, S.B. Brown, J.D. Fitzsimons, D. E. Tillitt, D. C. Honeyfield
Offshore-onshore correlation of upper Pleistocene strata, New Jersey Coastal Plain to continental shelf and slope
High-resolution seismic reflection profiles (~ 1-5 m resolution), including Geopulse(TM), Uniboom(TM), minisparker, small air gun, and water gun sources, are used to trace the ?? 18O stage 5 portion of the outcropping Cape May Formation across the shelf to the continental slope. The ?? 18O stage 5/6 boundary identified at Ocean Drilling Project (ODP) Site 903 on the continental slope anchors the o
Authors
R. E. Sheridan, G.M. Ashley, K.G. Miller, J.S. Waldner, D. W. Hall, J. Uptegrove
Oil and gas reserve growth-a model for the Volga-Ural Province, Russia
An understanding of reserve growth in known oil and gas fields has become a critical component of energy resource analysis. Significant statistical studies of reserve growth have been published in the U.S., whereas little information is available on other regions of the world. It may be expected that in many countries the magnitude of reserve growth is different from that in the U.S. because of di
Authors
M.K. Verma, G. F. Ulmishek, A.P. Gilbershtein
Overview of Pacific Island carbonate beach systems
Beach systems in Pacific Islands are Holocene deposits of reef-dervied and terrigenous sediment. Thus, geologic setting is important in determining the success at which beach systems are established. Generally, older islands exhibit better beach system development. Although modern beach systems are composed of Holocene sediment, development of suitable accommodation space requires more geologic ti
Authors
B. M. Richmond
Palaeohydrology, vegetation, and climate since the late Illinois Episode (~130 ka) in south-central Illinois
Our interpretation of pollen and ostracode successions from four basins in south-central Illinois provides a new synthesis of palaeovegetation, palaeohydrology, and palaeoclimate for the period from the late Illinois Episode (about 130,000 years ago) to near the end of the Wisconsin Episode (about 25,000 years ago). Correlations of pollen biozones between Raymond, Pittsburg, and Bald Knob basins a
Authors
B. Brandon Curry, R. G. Baker
Paleoclimate reconstruction along the Pole-Equator-Pole transect of the Americas (PEP 1)
Examples are presented of inter-hemispheric comparison of instrumental climate and paleoclimate proxy records from the Americas for different temporal scales. Despite a certain symmetry of seasonal precipitation patterns along the PEP I transect, decadal variability of winter precipitation shows different characteristics in terms of amplitude and frequency in both the last 100 and last 1000 years.
Authors
Vera Markgraf, T.R. Baumgartner, J.P. Bradbury, Henry F. Diaz, R. B. Dunbar, B.H. Luckman, G.O. Seltzer, T.W. Swetnam, R. Villalba
Paradigm shifts in theory and methods: regression quantile analysis enables new insights for ecology
No abstract available.
Authors
C.E. Bock, Brian S. Cade
Pesticide transport in the San Joaquin River Basin
Pesticide occurrence and concentrations were evaluated in the San Joaquin River Basin to determine potential sources and mode of transport. Land use in the basin is mainly agricultural. Spatial variations in pesticide occurrence were evaluated in relation to pesticide application and cropping patterns in three contrasting subbasins and at the mouth of the basin. Temporal variability in pesticide o
Authors
Neil M. Dubrovsky, Charles R. Kratzer, Sandra Y. Panshin, JoAnn M. Gronberg, Kathryn M. Kuivila
Physical modeling of a prototype slim-hold time-domain dielectric logging tool
No abstract available.
Authors
J.D. Abraham
Predictive modelling of flow in a two-dimensional intermediate-scale, heterogeneous porous media
To better understand the role of sedimentary structures in flow through porous media, and to determine how small-scale laboratory-measured values of hydraulic conductivity relate to in situ values this work deterministically examines flow through simple, artificial structures constructed for a series of intermediate-scale (10 m long), two-dimensional, heterogeneous, laboratory experiments. Nonline
Authors
Gilbert R. Barth, M. C. Hill, T.H. Illangasekare, H. Rajaram
Preface paper to the Semi-Arid Land-Surface-Atmosphere (SALSA) Program special issue
The Semi-Arid Land-Surface-Atmosphere Program (SALSA) is a multi-agency, multi-national research effort that seeks to evaluate the consequences of natural and human-induced environmental change in semi-arid regions. The ultimate goal of SALSA is to advance scientific understanding of the semi-arid portion of the hydrosphere-biosphere interface in order to provide reliable information for environme
Authors
D.C. Goodrich, A. Chehbouni, B. Goff, B. MacNish, T. Maddock, S. Moran, W.J. Shuttleworth, D. G. Williams, C. Watts, L.H. Hipps, D.I. Cooper, J. Schieldge, Y.H. Kerr, H. Arias, M. Kirkland, R. Carlos, P. Cayrol, W. Kepner, B. Jones, R. Avissar, A. Begue, J.-M. Bonnefond, G. Boulet, B. Branan, J.P. Brunel, L.C. Chen, T. Clarke, M.R. Davis, H. DeBruin, G. Dedieu, E. Elguero, W.E. Eichinger, J. Everitt, J. Garatuza-Payan, V.L. Gempko, H. Gupta, C. Harlow, O. Hartogensis, M. Helfert, C. Holifield, D. Hymer, A. Kahle, T. Keefer, S. Krishnamoorthy, J.-P. Lhomme, J.-P. Lagouarde, Seen D. Lo, D. Luquet, R. Marsett, B. Monteny, W. Ni, Y. Nouvellon, R. Pinker, C. Peters, D. Pool, J. Qi, S. Rambal, J. Rodriguez, F. Santiago, E. Sano, S.M. Schaeffer, M. Schulte, R. Scott, X. Shao, K.A. Snyder, S. Sorooshian, C.L. Unkrich, M. Whitaker, I. Yucel