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Abstracts Deadline: July 15, 2003


T70 top Heterogeneity in Sedimentary Aquifers: Challenges for Characterization and Flow Modeling
GSA Hydrogeology Division
Timothy T. Eaton, Wisconsin Geological and Natural History Survey, Madison, WI; Kenneth R. Bradbury, Wisconsin Geological and Natural History Survey, Madison, WI
Many groundwater settings do not have the homogeneous, isotropic conditions often assumed in sedimentary aquifers. This session will bring together hydrogeologic characterization and flow modeling work in complex environments such as heterogeneous unlithified material, carbonate and clastic bedrock, karst, and fractured or faulted settings. ORAL
Hydrogeology; Sediments, Carbonates; Sediments, Clastic
T71 top Hydrogeology of Volcanic Arcs
GSA Hydrogeology Division
Michael Manga, University of California, Berkeley, CA; Timothy Rose, Lawrence Livermore National Lab, Livermore, CA
Many of the unusual hydrologic systems and processes in volcanic arcs result indirectly from active magmatism. Magmatic activity affects both hydrogeologic properties and the range of temperatures at which water-rock interactions occur. We welcome submissions dealing with the full spectrum of temperature, depth, and time scales. ORAL and POSTER
Hydrogeology; Volcanology
T72 top A Century of Hydrogeologic Investigations and Groundwater Modeling in the Great Basin: What Have We Learned?
GSA Hydrogeology Division; U.S. Geological Survey
Wayne R. Belcher, U.S. Geological Survey, Henderson, NV; Donald S. Sweetkind, U.S. Geological Survey, Denver, CO
What have we learned about the hydrogeology of this region and how are these data used to model the groundwater system? We welcome presentations that provide historical perspective and recent advances on understanding the hydrogeologic system of this important region that includes the Nevada Test Site and Yucca Mountain. ORAL
Hydrogeology; Structural Geology; Tectonics
T73 top The Integration of Measurements and Modeling in the Hydrological Sciences
GSA Hydrogeology Division
Kellie B. Vache, Oregon State University, Corvallis, OR; Jeffrey J. McDonnell, Oregon State University, Corvallis, OR
This session will focus the utilization of measurements in modeling exercises, introduction of new model structures that better facilitate the use of measurements, or exploration of the role of numerical experiments and/or GIS in increasing the dialogue between experimentalist and modeler. ORAL and POSTER
Hydrogeology; Engineering Geology; Remote Sensing/Geographic Info System
T74 top Revolutionizing Ocean Science: Cabled Observatories on the North American Pacific Coast
John Delaney, University of Washington, Seattle, WA; Christopher Barnes, University of Victoria, Victoria, BC
The ocean sciences are entering a new era through the deployment of powered, fiber-optic cabled observatories that will provide real-time data and decadal time series. This session will consider the scientific, technological, and educational opportunities offered by three observatory projects under way on the Pacific margin of North America. ORAL
Marine/Coastal Science
T75 top Human Versus Natural Influences on Holocene Sedimentation in Estuaries, Harbors, and Marginal Marine Ecosystems
GSA Sedimentary Geology Division; Society for Sedimentary Geology
Douglas W. Haywick, University of South Alabama, Mobile, AL; Miriam L. Fearn, University of South Alabama, Mobile, AL
This session will focus on the sedimentology and ecology of Recent deposits within marginal marine environments. In particular, it will bring together researchers examining human-induced and natural influences on Holocene sediment fill within these important ecosystems. ORAL and POSTER
Marine/Coastal Science; Quaternary Geology/Geomorphology; Paleoclimatology/Paleoceanography
T76 top Present Posture and Future Status of Pacific Atoll Research
GSA International Division
John D. Collen, Victoria University of Wellington, Wellington, New Zealand; Douglas Edsall, U.S. Naval Academy, Annapolis, MD
This session will examine the current state of knowledge of sedimentary and biological systems of Pacific atolls and discuss the additional information needed to support future management of atoll environments. Atolls in the Pacific, as elsewhere, are threatened by overpopulation, development, pollution, and global environmental change. ORAL and POSTER
Sediments, Carbonates; Environmental Geoscience; Marine/Coastal Science
T77 top Coastal Processes and Hazards Along Active Margin and Low Latitude Coasts
GSA Engineering Geology Division
Cheryl J. Hapke, U.S. Geological Survey, Santa Cruz, CA; Laura J. Moore, Oberlin College, Oberlin, OH
This session will focus on the latest developments in our understanding of active margin and low latitude coastal processes and hazards, as well as effective mitigation strategies. ORAL and POSTER
Marine/Coastal Science; Quaternary Geology/Geomorphology; Environmental Geoscience
T78 top Gas Hydrate in the Natural Environment and Implications for Energy Resources, Seafloor Stability, Climate, and the Biology of the Deep Sea
William P. Dillon, U.S. Geological Survey, Woods Hole, MA; Timothy S. Collett, U.S. Geological Survey, Denver, CO; Deborah R. Hutchinson, U.S. Geological Survey, Woods Hole, MA
This session will emphasize recent concepts and field results regarding mechanisms of concentration of gas hydrate, control of landslides, contribution of methane to the atmosphere, implications for vent biota, and general characterization of natural gas hydrate. ORAL
Marine/Coastal Science; Environmental Geoscience; Engineering Geology
T79 top Biogeochemical Processes at Ancient and Modern Methane Seeps
Burke Museum of Natural History and Culture
Joern Peckmann, Research Center for Ocean Margins, University of Bremen, Bremen, Germany; James L. Goedert
Numerous hydrocarbon-seep deposits have been reported from Recent and Cenozoic strata, and relatively few Mesozoic and Paleozoic deposits have been recognized. Distinctive carbonate fabrics, stable isotope signatures, and biomarker patterns are diagnostic for biogeochemical processes at ancient seep sites. ORAL
Marine/Coastal Science; Paleoclimatology/Paleoceanography; Paleontology/Paleobotany
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