Conference Papers
Science Quality and Integrity
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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.
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Large-scale scour of the sea floor and the effect of natural armouring processes, land reclamation Maasvlakte 2, port of Rotterdam
Morphological model computations based on uniform (non-graded) sediment revealed an unrealistically strong scour of the sea floor in the immediate vicinity to the west of Maasvlakte 2. By means of a state-of-the-art graded sediment transport model the effect of natural armouring and sorting of bed material on the scour process has been examined. Sensitivity computations confirm that the developmen
Authors
S. Boer, E. Elias, S. Aarninkhof, D. Roelvink, T. Vellinga
Late Cretaceous to Paleocene metamorphism and magmatism in the Funeral Mountains metamorphic core complex, Death Valley, California
Amphibolite-facies Proterozoic metasedimentary rocks below the low-angle Ceno-zoic Boundary Canyon Detachment record deep crustal processes related to Meso-zoic crustal thickening and subsequent extension. A 91.5 ?? 1.4 Ma Th-Pb SHRIMP-RG (sensitive high-resolution ion microprobe-reverse geometry) monazite age from garnet-kyanite-staurolite schist constrains the age of prograde metamorphism in the
Authors
C.G. Mattinson, J.P. Colgan, J.R. Metcalf, E. L. Miller, J. L. Wooden
Local search for optimal global map generation using mid-decadal landsat images
NASA and the US Geological Survey (USGS) are seeking to generate a map of the entire globe using Landsat 5 Thematic Mapper (TM) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+) sensor data from the "mid-decadal" period of 2004 through 2006. The global map is comprised of thousands of scene locations and, for each location, tens of different images of varying quality to chose from. Furthermore, i
Authors
L. Khatib, J. Gasch, Robert Morris, S. Covington
Magmatic gas efflux at the Ukinrek Maars, Alaska
No abstract available.
Authors
Deborah Bergfeld, W. C. Evans, A.G. Hunt, R. G. McGimsey
Mercury in sediments, Alviso and Eden Landing salt ponds, south San Francisco Bay, California
No abstract available.
Authors
A.K. Miles, M.A. Ricca, S.E. Spring, C. Morris, C. Wilcox, T. Maurer
Mixed sediment beach processes: Kachemak Bay, Alaska
Mixed sediment beaches are morphologically distinct from and more complex than either sand or gravel only beaches. Three digital imaging techniques are employed to quantify surficial grain size and bedload sediment transport rates along the mixed sediment beaches of Kachemak Bay, Alaska. Applying digital imaging procedures originally developed for quickly and efficiently quantifying grain sizes of
Authors
P. Ruggiero, P.N. Adams, J.A. Warrick
Modeling barrier island response to sea-level rise in the Outer Banks, North Carolina
An 8500-year Holocene simulation developed in GEOMBEST provides a possible scenario to explain the evolution of barrier coast between Rodanthe and Cape Hatteras, NC. Sensitivity analyses suggest that in the Outer Banks, the rate of sea-level rise is the most important factor in determining how barrier islands evolve. The Holocene simulation provides a basis for future simulations, which suggest th
Authors
Laura J. Moore, Jeffrey H. List, S. Jeffress Williams, David Stolper
Modeling dune response using measured and equilibrium bathymetric profiles
Coastal engineers typically use numerical models such as SBEACH to predict coastal change due to extreme storms. SBEACH model inputs include pre-storm profiles, wave heights and periods, and water levels. This study focuses on the sensitivity of SBEACH to the details of pre-storm bathymetry. The SBEACH model is tested with two initial conditions for bathymetry, including (1) measured bathymetry fr
Authors
Laura A. Fauver, David M. Thompson, Asbury H. Sallenger
MODIS imagery as a tool for synoptic water quality assessments in the southern California coastal ocean
The dynamics of rainstorm plumes in the coastal waters of southern California was studied during the Bight'03 Regional Water Quality Program surveys. Measurements of surface salinity and bacterial counts collected from research vessels were compared to MODIS-Aqua satellite imagery. The spectra of normalized water-leaving radiation (nLw) were different in plumes and ambient ocean waters, enabling p
Authors
N.P. Nezlin, P.M. DiGiacomo, B.H. Jones, K.M. Reifel, J.A. Warrick, S.C. Johnson, M.J. Mengel
Monitoring microearthquakes with the San Andreas fault observatory at depth
In 2005, the San Andreas Fault Observatory at Depth (SAFOD) was drilled through the San Andreas Fault zone at a depth of about 3.1 km. The borehole has subsequently been instrumented with high-frequency geophones in order to better constrain locations and source processes of nearby microearthquakes that will be targeted in the upcoming phase of SAFOD. The microseismic monitoring software MIMO, dev
Authors
V. Oye, W.L. Ellsworth
MT+, integrating magnetotellurics to determine earth structure, physical state, and processes
As one of the few deep-earth imaging techniques, magnetotellurics provides information on both the structure and physical state of the crust and upper mantle. Magnetotellurics is sensitive to electrical conductivity, which varies within the earth by many orders of magnitude and is modified by a range of earth processes. As with all geophysical techniques, magnetotellurics has a non-unique inverse
Authors
P. A. Bedrosian
Multi-channel resistivity investigations of the freshwater-saltwater interface: A new tool to study an old problem
It has been well established that fresh or brackish groundwater can exist both near and far from shore in many coastal and marine environments. The often permeable nature of marine sediments and the underlying bedrock provides abundant pathways for submarine groundwater discharge. While submarine groundwater discharge as a coastal hydrogeological phenomenon has been widely recognized, only recent
Authors
P.W. Swarzenski, S. Kruse, C. Reich, W.V. Swarzenski