Current Search: Sediment (x)
Pages
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Title
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Influence of depth-dependent sediment properties on the pressure reflection coefficient at normal incidence using the Biot-Stoll model.
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Creator
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Joussein, Marianne., Florida Atlantic University, Beaujean, Pierre-Philippe
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Abstract/Description
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The impact of depth-dependent geophysical parameters on the acoustic pressure reflection coefficient is studied at normal incidence using the Biot-Stoll theory in porous marine sediments. The seabed is modeled as a sediment layer with depth-dependent properties on top of a homogeneous half-space, as originally proposed by Stern. There is no discontinuity in sediment properties between the layer and the half-space. The reflection coefficient is determined by the evaluation of boundary...
Show moreThe impact of depth-dependent geophysical parameters on the acoustic pressure reflection coefficient is studied at normal incidence using the Biot-Stoll theory in porous marine sediments. The seabed is modeled as a sediment layer with depth-dependent properties on top of a homogeneous half-space, as originally proposed by Stern. There is no discontinuity in sediment properties between the layer and the half-space. The reflection coefficient is determined by the evaluation of boundary conditions at the water-sediment layer interface and the sediment layer-half-space interface. Results are obtained for different types of sediment, from medium size sands to silty clay, and different porosity profiles vs. depth.
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Date Issued
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2004
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PURL
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http://purl.flvc.org/fcla/dt/13168
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Subject Headings
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Marine sediments--Acoustic properties, Underwater acoustics--Measurement, Sediments (Geology), Environmental geology
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Format
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Document (PDF)
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Title
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Chlorophyll distribution in continental shelf sediments off West Palm Beach, Florida and west end, Bahamas.
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Creator
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Heffernan, John J., Gibson, R. A., Harbor Branch Oceanographic Institute
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Date Issued
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1983
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PURL
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http://purl.flvc.org/FCLA/DT/3173005
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Subject Headings
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Marine sediments, Continental shelf, Chlorophyll, Pigments Analysis, Oceanographic submersibles
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Format
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Document (PDF)
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Title
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Pore water chemistry of an overwash mangrove island.
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Creator
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Carlson, Paul R., Yarbro, Laura A., Zimmermann, Carl F., Montgomery, John R., Harbor Branch Oceanographic Institute
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Date Issued
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1983
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PURL
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http://purl.flvc.org/fau/fd/FA00007481
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Subject Headings
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Pore water--Florida--Indian River, Mangroves, Sediment
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Format
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Document (PDF)
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Title
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Metal concentration in oyster, Crassostrea Gigas, and sediment in Ann-Ping Mariculture Ground, Taiwan.
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Creator
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Lee, C.-L., Wang, Tsen C., Hsu, C.-H., Lay, S.-F., Harbor Branch Oceanographic Institute
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Date Issued
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1998
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PURL
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http://purl.flvc.org/FCLA/DT/3352935
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Subject Headings
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Crassostrea gigas, Pacific oyster, Metals, Sediment, Mariculture--Taiwan
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Format
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Document (PDF)
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Title
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Measuring effects of predation on benthic communities in soft sediments.
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Creator
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Virnstein, Robert W., Harbor Branch Oceanographic Institute
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Date Issued
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1980
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PURL
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http://purl.flvc.org/FCLA/DT/3353730
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Subject Headings
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Benthos, Predation (Biology), Sediment, Predation (Biology)--Research--Methodology
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Format
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Document (PDF)
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Title
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A close-interval sampler for collection of sediment pore waters for nutrient analyses.
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Creator
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Montgomery, John R., Price, Mary T., Holt, John K., Zimmermann, Carl F., Harbor Branch Oceanographic Institute
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Date Issued
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1981
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PURL
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http://purl.flvc.org/FCLA/DT/3174219
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Subject Headings
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Nutrient pollution of water, Water --Sampling, Pore water, Sediment
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Format
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Document (PDF)
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Title
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Light scattering and extinction in a highly turbid coastal inlet.
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Creator
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Thompson, M. John, Gilliland, Lewis E., Rosenfeld, Leslie K., Harbor Branch Oceanographic Institute
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Date Issued
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1979
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PURL
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http://purl.flvc.org/FCLA/DT/3174007
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Subject Headings
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Inlets, Turbidity, Light --Scattering, Suspended sediments, Regression analysis
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Format
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Document (PDF)
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Title
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Light transmissivity, suspended sediments and the legal definition of turbidity.
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Creator
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McCarthy, John C., Pyle, Thomas E., Griffin, George M., Harbor Branch Oceanographic Institute
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Date Issued
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1974
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PURL
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http://purl.flvc.org/FCLA/DT/3174475
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Subject Headings
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Estuaries, Turbidity currents, Light --Transmission, Suspended sediments, Water quality --Standards
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Format
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Document (PDF)
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Title
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Tidal residual currents and sediment transport through multiple tidal inlets.
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Creator
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Liu, James T., Aubrey, David G., Harbor Branch Oceanographic Institute
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Date Issued
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1993
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PURL
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http://purl.flvc.org/FCLA/DT/3172972
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Subject Headings
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Tidal currents, Sediment transport, Tides, Inlets, Estuarine oceanography
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Format
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Document (PDF)
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Title
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Temporal and spatial variation in habitat characteristics of tilefish (Lopholatilus chamaeleonticeps) off the east coast of Florida.
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Creator
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Able, Kenneth W., Grimes, Churchill B., Jones, Robert S., Twichell, David C., Harbor Branch Oceanographic Institute
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Date Issued
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1993
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PURL
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http://purl.flvc.org/FCLA/DT/3172857
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Subject Headings
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Tilefish, Marine sediments --Florida, Carbonates, Sidescan sonar, Oceanographic submersibles
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Format
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Document (PDF)
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Title
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Turbidity,suspended sediment concentrations, clay mineralogy of suspended sediments, and the origin of theturbid near-bottom water layer -- Louisiana shelf south of Timbalier Bay -- August 1972 - January 1974-- with comments on a process model for turbid layer transport.
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Creator
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Griffin, G. M., Ripy, B. J., Harbor Branch Oceanographic Institute
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Date Issued
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1974
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PURL
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http://purl.flvc.org/fau/fd/FA00007428
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Subject Headings
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Timbalier Bay (La.), Turbidity, Suspended sediments, Clay minerals
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Format
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Document (PDF)
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Title
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Computer simulation of tide-induced residual transport in a coastal lagoon.
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Creator
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Smith, Ned P.
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Date Issued
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1990
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PURL
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http://purl.flvc.org/FCLA/DT/3172975
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Subject Headings
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Computer simulation, Tidal currents, Ocean currents, Sediment transport, Lagoons
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Format
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Document (PDF)
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Title
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Observations and simulations of water-sediment heat exchange in a shallow coastal lagoon.
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Creator
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Smith, Ned P.
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Date Issued
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2002
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PURL
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http://purl.flvc.org/FCLA/DT/3172997
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Subject Headings
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Indian River (Fla.: Lagoon), Temperature, Marine sediments, Estuaries, Heat --Transmission
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Format
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Document (PDF)
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Title
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Relationships between seagrass bed characteristics and juvenile queen conch (Strombus gigas Linne) abundance in the Bahamas.
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Creator
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Stoner, Allan W., Lin, Junda, Hanisak, M. Dennis
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Date Issued
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1995
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PURL
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http://purl.flvc.org/FCLA/DT/3174041
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Subject Headings
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Seagrasses, Queen conch, Algae, Multivariate analysis, Sediment, Suspended
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Format
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Document (PDF)
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Title
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Volume transport through tidal channels in the middle Florida Keys.
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Creator
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Smith, Ned P., Lee, Thomas L.
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Date Issued
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2003
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PURL
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http://purl.flvc.org/FCLA/DT/3172915
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Subject Headings
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Tidal currents, Sediment transport, Winds, Doppler effect, Hydrodynamics
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Format
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Document (PDF)
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Title
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Sequence stratigraphy of the arcadia formation, Southeast Florida: an integrated approach.
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Creator
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Wright, Caroline Marie, Oleinik, Anton E., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Geosciences
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Abstract/Description
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The Arcadia Formation is a mixed carbonate-siliciclastic rock unit that existed as a shallow carbonate ramp to platform environment during the Late Oligocene to Early Miocene Epoch. It can be divided into two distinct, informal sections based on lithological properties: the upper Arcadia Formation and lower Arcadia Formation. The sections are part of a major, third-order sequence that can be further divided into four higher-frequency, lower magnitude sequences: ARS1, ARS2, ARS3, and ARS4. The...
Show moreThe Arcadia Formation is a mixed carbonate-siliciclastic rock unit that existed as a shallow carbonate ramp to platform environment during the Late Oligocene to Early Miocene Epoch. It can be divided into two distinct, informal sections based on lithological properties: the upper Arcadia Formation and lower Arcadia Formation. The sections are part of a major, third-order sequence that can be further divided into four higher-frequency, lower magnitude sequences: ARS1, ARS2, ARS3, and ARS4. The sequence boundary separating ARS2 and ARS3 represents a drastic change in the depositional regime from a high-energy, inner ramp/platform to a lower-energy, deep outer ramp environment. ARS3 represents the period of maximum flooding and constitutes a major portion of the regressive system tract (RST) of the third order depositional sequence. In certain sections, the Arcadia Formation is heavily bioturbated including ichnotaxa from the glossifungites, cruziana, and scolithos inchofacies. Thalassinoides sp. burrows of the glossifungites ichnofacies were found to be commonly associated with firmground substrates and breaks in sedimentation. The lithofacies associations were grouped into paleodepositional environments that ranged from restricted marine to deep outer ramp with lithology ranging from grainstone to wackestone to mudstone with variable amounts of siliciclastic and phosphatic constituents. Each sequence boundary extends regionally south from Broward County to southern Miami-Dade County utilizing gamma-ray geophysical signatures unique to each sequence.
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Date Issued
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2014
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PURL
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http://purl.flvc.org/fau/fd/FA00004239
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Subject Headings
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Geology, Stratigraphic, Sedimentation and deposition -- Florida -- Arcadia Formation, Sequence stratigraphy
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Format
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Document (PDF)
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Title
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Broadband measurements of compressional wave attenuation.
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Creator
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Reeder, Angela Christine., Florida Atlantic University, Schock, Steven G., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
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Abstract/Description
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An in situ acoustic measurement system was developed to estimate the compressional wave attenuation of marine sediments. The system uses acoustic probes to measure a wideband acoustic pulse traveling horizontally though various sediments. The system transmits a 20 millisecond frequency-modulated (FM) pulse swept from 3 to 50 kHz and match filters the received signals. A special ratio of data collected at two horizontal ranges from the source is used to estimate attenuation as a function of...
Show moreAn in situ acoustic measurement system was developed to estimate the compressional wave attenuation of marine sediments. The system uses acoustic probes to measure a wideband acoustic pulse traveling horizontally though various sediments. The system transmits a 20 millisecond frequency-modulated (FM) pulse swept from 3 to 50 kHz and match filters the received signals. A special ratio of data collected at two horizontal ranges from the source is used to estimate attenuation as a function of frequency. Data is collected with the in situ system and a chirp subbottom profiling sonar at two offshore sites to compare the attenuation of horizontally and vertically traveling waves in sediment. The collected data is also used to determine the feasibility of remotely estimating in situ attenuation using a chirp sonar. In situ and chirp sonar estimates agree and fall within the range of attenuation measurements made by other investigators in similar sediments.
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Date Issued
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1996
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PURL
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http://purl.flvc.org/fcla/dt/15327
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Subject Headings
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Marine sediments--Acoustic properties--Measurement, Signal processing
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Format
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Document (PDF)
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Title
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THE EFFECTS OF OVERHANGING LEDGES ON THE MACROINVERTEBRATE BENTHOS OF A SUBTIDAL SANDY BOTTOM.
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Creator
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STANALAND, BROCK EDWARD., Florida Atlantic University
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Abstract/Description
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The effects of overharging ledges on subtidal macroinvertebrate infauna was investigated in northern Broward County, Florida during August 1976 and February 1977. At each of six stations along a limestone outcropping, collections were made from open sand areas and adjacent underledge areas. Organisms retained on a 0.5mm screen were collected and identified. Although open sand and underledge areas yielded essentially the same species, faunal densities were consistently and conspicuously lower...
Show moreThe effects of overharging ledges on subtidal macroinvertebrate infauna was investigated in northern Broward County, Florida during August 1976 and February 1977. At each of six stations along a limestone outcropping, collections were made from open sand areas and adjacent underledge areas. Organisms retained on a 0.5mm screen were collected and identified. Although open sand and underledge areas yielded essentially the same species, faunal densities were consistently and conspicuously lower in the latter sites. Differences were probably a result of current activity as it affected detritovores and filter feeding organisms.
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Date Issued
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1977
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PURL
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http://purl.flvc.org/fcla/dt/13899
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Subject Headings
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Marine sediments--Atlantic Coast, Benthos, Marine invertebrates
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Format
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Document (PDF)
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Title
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Oscillating-tank experiments for quantification of water-sediment phosphorus exchange.
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Creator
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Khan, Abul Basher., Florida Atlantic University, Scarlatos, Panagiotis (Pete) D., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
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Abstract/Description
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Phosphorus exchange between sediment-water system was observed under molecular diffusion and turbulent condition. Some experiments were focused on adsorption behavior under common environmental factors (e.g., temperature, salinity and pH). The sediment suspension was found to have a significant effect on phosphorus movement to the upper layer water. Higher temperature increased the release of phosphorus from kaolinite and lake sediments, and the effect was almost nil for bentonite....
Show morePhosphorus exchange between sediment-water system was observed under molecular diffusion and turbulent condition. Some experiments were focused on adsorption behavior under common environmental factors (e.g., temperature, salinity and pH). The sediment suspension was found to have a significant effect on phosphorus movement to the upper layer water. Higher temperature increased the release of phosphorus from kaolinite and lake sediments, and the effect was almost nil for bentonite. Temperature effect was pronounced on kaolinite where relatively higher release of phosphorus observed. Salinity effect on lake sediments was not significantly important for release or adsorption. Bentonite showed a release of phosphorus after addition of salts. Adsorption on kaolinite was found higher at pH 4.7-5.0. The study was also focused on the estimation of phosphorus partitioning due to molecular diffusion and turbulent mixing. The observed behavior of the phosphorus exchange under different conditions showed an agreement with the observations by the other investigators.
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Date Issued
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1993
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PURL
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http://purl.flvc.org/fcla/dt/14947
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Subject Headings
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Water--Phosphorus content, Sediment, Suspended, Nutrient interactions, Eutrophication
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Format
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Document (PDF)
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Title
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Real time method for remote measurement of compressional wave attenuation.
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Creator
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DeBruin, Darryl L., Florida Atlantic University, Schock, Steven G.
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Abstract/Description
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An acoustic measurement system is developed to estimate the compressional wave attenuation of marine sediments in real time. A chirp sonar transmits filtered digital reflection data to a signal processing computer that processes the data on an AT&T DSP32C chip. The signal processing computer estimates and displays the center frequency of the processed pulse as it is attenuated by the ocean sediments. Wavelet modelling establishes the relationship between the center frequency shift and...
Show moreAn acoustic measurement system is developed to estimate the compressional wave attenuation of marine sediments in real time. A chirp sonar transmits filtered digital reflection data to a signal processing computer that processes the data on an AT&T DSP32C chip. The signal processing computer estimates and displays the center frequency of the processed pulse as it is attenuated by the ocean sediments. Wavelet modelling establishes the relationship between the center frequency shift and relaxation time, from which the sediment type and compressional wave attenuation are determined. Frequency contours from two different data sites demonstrate that the system is able to reliably estimate sediment type and compressional wave attenuation. Error introduced by noise is below 1% for noise levels less than 0.1 of the normalized processed signal. Random error in the estimates is minimized by determining reliable frequency values and by ensemble averaging the values.
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Date Issued
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1992
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PURL
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http://purl.flvc.org/fcla/dt/14824
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Subject Headings
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Marine sediments--Acoustic properties, Signal processing--Computer simulation
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Format
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Document (PDF)
Pages