Publications
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Sound Waves Newsletter
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Filter Total Items: 1780
Laboratory measurements of compressional and shear wave speeds through methane hydrate Laboratory measurements of compressional and shear wave speeds through methane hydrate
Simultaneous measurements of compressional and shear wave speeds through polycrystalline methane hydrate have been made. Methane hydrate, grown directly in a wave speed measurement chamber, was uniaxially compacted to a final porosity below 2%. At 277 K, the compacted material had a compressional wave speed of 3650 ?? 50 m/s. The shear wave speed, measured simultaneously, was 1890 ?? 30...
Authors
W.F. Waite, M.B. Helgerud, A. Nur, J.C. Pinkston, L.A. Stern, S. H. Kirby, W.B. Durham
Contaminant distribution and accumulation in the surface sediments of Long Island Sound Contaminant distribution and accumulation in the surface sediments of Long Island Sound
The distribution of contaminants in surface sediments has been measured and mapped as part of a U.S. Geological Survey study of the sediment quality and dynamics of Long Island Sound. Surface samples from 219 stations were analyzed for trace (Ag, Ba, Cd, Cr, Cu, Hg, Ni, Pb, V, Zn and Zr) and major (Al, Fe, Mn, Ca, and Ti) elements, grain size, and Clostridium perfringens spores...
Authors
E.L. Mecray, Marilyn R. Buchholtz ten Brink
Georeferenced sea-floor mapping and bottom photography in Long Island Sound Georeferenced sea-floor mapping and bottom photography in Long Island Sound
No abstract available.
Authors
Valerie F. Paskevich, Lawrence J. Poppe
National assessment of coastal vulnerability to sea-level rise: Preliminary results for the U.S. Gulf of Mexico Coast National assessment of coastal vulnerability to sea-level rise: Preliminary results for the U.S. Gulf of Mexico Coast
No abstract available.
Authors
E. Robert Thieler, Erika S. Hammar-Klose
Seabed observation and sampling system Seabed observation and sampling system
No abstract available.
Authors
Page C. Valentine, Dann Blackwood, Kenneth F. Parolski
Bottom currents and sediment transport in Long Island Sound: A modeling study Bottom currents and sediment transport in Long Island Sound: A modeling study
A high resolution (300-400 m grid spacing), process oriented modeling study was undertaken to elucidate the physical processes affecting the characteristics and distribution of sea-floor sedimentary environments in Long Island Sound. Simulations using idealized forcing and high-resolution bathymetry were performed using a three-dimensional circulation model ECOM (Blumberg and Mellor...
Authors
R. P. Signell, J. H. List, A.S. Farris
Distribution of surficial sediment in Long Island Sound and adjacent waters: Texture and total organic carbon Distribution of surficial sediment in Long Island Sound and adjacent waters: Texture and total organic carbon
The surficial sediment distribution within Long Island Sound has been mapped and described using bottom samples, photography, and sidescan sonar, combined with information from the geologic literature. The distributions of sediment type and total organic carbon (TOC) reveal several broad trends that are largely related to the sea-floor geology, the bathymetry, and the effects of modern...
Authors
L. J. Poppe, H.J. Knebel, Z.J. Mlodzinska, M. E. Hastings, B. A. Seekins
Modeling surface trapped river plumes: A sensitivity study Modeling surface trapped river plumes: A sensitivity study
To better understand the requirements for realistic regional simulation of river plumes in the Gulf of Maine, we test the sensitivity of the Blumberg-Mellor hydrodynamic model to choice of advection scheme, grid resolution, and wind, using idealized geometry and forcing. The test case discharges 1500 m3/s of fresh water into a uniform 32 psu ocean along a straight shelf at 43?? north...
Authors
Jason Hyatt, Richard P. Signell
Modeling sand bank formation around tidal headlands Modeling sand bank formation around tidal headlands
Sandbanks are often found in the vicinity of coastal headlands around which tidal flows are strong enough to generate significant tidally-forced residual eddies, typically with scales of 2-10 km. One popular hypothesis is that these sandbanks are generated by a 'tidal stirring' mechanism in which the inward-directed pressure gradient associated with these residual eddies produces an...
Authors
Richard P. Signell, Courtney K. Harris
Predicting the physical effects of relocating Boston's sewage outfall Predicting the physical effects of relocating Boston's sewage outfall
Boston is scheduled to cease discharge of sewage effluent in Boston Harbor in Spring 2000 and begin discharge at a site 14 km offshore in Massachusetts Bay in a water depth of about 30 m. The effects of this outfall relocation on effluent dilution, salinity and circulation are predicted with a three-dimensional hydrodynamic model. The simulations predict that the new bay outfall will...
Authors
R. P. Signell, H. L. Jenter, A.F. Blumberg
A modern earth narrative: What will be the fate of the biosphere? A modern earth narrative: What will be the fate of the biosphere?
The modern Earth Narrative is the scientific description of the natural and human history of the Earth, and it is based on two fundamental concepts: Deep (or Geologic) Time and Biological Evolution. Changes in the Earth's biosphere and geosphere are discussed from the perspective of natural variability and impacts of the rapid increase in the human population. The failure of humans to...
Authors
R.S. Williams