Richard H. Bennett

Engineering Associates (United States)

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Matthew H. Hulbert

IR Dynamics (United States)

Kenneth J. Curry

University of Southern Mississippi

Douglas N. Lambert

Stennis Space Center

Roy J. Baerwald

University of New Orleans

William Sawyer

CSCS - Swiss National Supercomputing Centre

Tokuo Yamamoto

University of Miami

George H. Keller

NOAA Atlantic Oceanographic and Meteorological Laboratories

Mohsen Badiey

University of Delaware

Conrad W. Curry

Stennis Space Center

Barbara Ransom

University of Georgia

Cooperative Institutions

Stennis Space Center

United States Naval Research Laboratory

Scripps Institution of Oceanography

NOAA Atlantic Oceanographic and Meteorological Laboratories

National Oceanic and Atmospheric Administration

University of Washington

University of California, San Diego

Texas A&M University

University of Miami

United States Geological Survey

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Geological and geotechnical research on seafloor stability of continental margins

Geo-Marine Letters (1982)

Richard H. Bennett James R. Hooper Robert G. Bea

Seafloor Spreading

Continental Margin

10.1007/bf02462750

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Citations (3)

Electrostatic Cleaning Technique For Fabric Sem Samples

Clays and Clay Minerals (1975)

Matthew H. Hulbert Richard H. Bennett

10.1346/ccmn.1975.0230410

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Citations (10)

Bulk sediment properties interpreted in light of qualitative and quantitative microfabric analysis

Geo-Marine Letters (1996)

Dennis M. Lavoie Dawn Lavoie H. Alan Pittenger Richard H. Bennett

Illite

10.1007/bf01204513

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Citations (10)

Hydrodynamic Stresses Driving Pore Pressure Changes in Sandy Coastal Sediments

Richard H. Bennett

Abstract : The project goals are two-fold: to (1) quantify the ambient and dynamic pore water pressures and pore water pressure changes in selected coastal sediments and (2) measure other environmental parameters including water column and sediment properties in support of a NATO Mine Burial modeling study. An important aspect of the work is the quantification of the first order forces responsible for the dynamic bottom pressures and pore pressure behavior in sandy seafloor sediments in response to wave-induced bottom stresses. Objectives of the Phase II (FY-98) field exercise were to collect environmental and sediment properties data in support of the NATO Mine Burial Modeling effort for prediction and evaluation of liquefaction and scour. In addition to the pore pressure measurements collected with a multi- piezometer probe, numerous in situ electrical conductivity measurements provided a statistically reliable sediment property database of porosity, void ratio, wet bulk density and dry bulk density. Sediment sampling with cores and grabs by other participants provided material for detailed grain size analyses and other sediment property tests. Sediments were fine to medium sand. The test site was the same area as the 1997 Phase I experiment (designated as area C-1) conducted in water depths of ~15 meters (plus or minus tidal changes) off the coast of Holland.

10.21236/ada629408

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Seabed-Structure Interaction: Workshop Report and Recommendations for Future Research Held in Metairie, Louisiana on 5-6 November 1991.

Richard H. Bennett Wayne A. Dunlap Homa J Lee

Abstract : Intrinsic to the topic of Seabed-Structure Interaction (S-SI) of objects coupled with the seafloor is the dynamics of the 'system.' The dynamics involve environmental forcing of the object and the seabed, the fundamental properties of the geological material, the size an shape of the object, and the time-dependent processes associated with the coupling of the water column, seabed, and the object. Thus, the most crucial S-Sl research problems to address in the Coastal Benthic Boundary Layer Special Research Project (SRP) should focus on the dynamics and time-dependent processes affecting objects coupled to the sea floor. The research efforts should include a range of scales from micro to macro but largely focused on the dynamics and processes in proximity to the object rather than broad scale geological oceanographic processes. Much is to be gained by interdisciplinary research well focused on specific S-SI phenomena.

Seabed

Seafloor Spreading

Forcing (mathematics)

Source

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Sediment Mass Physical PropertiesPanama Basin and Northeastern Equatorial Pacific

U.S. Government Printing Office eBooks (1973)

George H. Keller Richard H. Bennett

Leg 16 provided a rare opportunity to conduct a detailed study of the sediment mass physical properties from depths greater than a few meters.Data presented here, with the exception of shear strength, are derived from shore-based laboratory analyses rather than the shipboard tests which have normally been reported for previous legs.This study indicates that there is no apparent relationship between variation of mass physical properties and the age of the sediment or the rate of sedimentation.The greatest single factor influencing the physical properties appears to be the depth of burial.Based on this study it is possible to delineate the characteristic physical properties of the six prominent sediment types encountered on Leg 16.In all but one test the samples were were found to be overconsolidated.It is felt that these sediments are not overconsolidated in the sense that the term is used in soil mechanics but display this characteristic as a result of some form of diagenetic bonding developed during deposition.At only one of the eight sites of Leg 16 was porosity found not to decrease appreciably with depth.This condition may, in some way, correlate with the increased content of clay-size material relative to the other sites.

Panama

Pacific basin

10.2973/dsdp.proc.16.112.1973

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Citations (18)

Geotechnical property variability of continental margin sediments: High‐resolution vertical and lateral data from the northern California slope

Marine Georesources and Geotechnology (1997)

William Sawyer Barbara Ransom Richard H. Bennett

High‐resolution vertical and lateral gradients and variations in sediment mass physical properties were derived from measurements in box cores, on the scale of millimeters, tens of centimeters, and kilometers from typical, relatively broad areas of the northern California continental slope in the Cape Mendocino area at water depths from 380 to 940 m. Such data are important as a control on comparisons of different sediment suites, as well as providing limits for realistic flux calculations of dissolved inorganic and biochemical species and pollutants. The sediments studied have relatively constant organic carbon contents (OC ? 1.75 wt%) and bulk mineralogy. They range from silty sands (∼45% sand, 40% silt) to clayey silts (∼63% silt, ∼35% clay) and are extensively bioturbated. Physical property variations between subcores (∼25 to 35 cm in length), taken from the same box core, increase with increasing clay content. For coarse‐grained sediments, mean down‐core differences in physical property values between related subcores are small, averaging 3.6% for water content, 4% for porosity, 0.026 Mg/m3 for wet bulk density, and 0.1 for void ratio. Subcore variations for fine‐grained sediments are generally significantly larger, averaging 9.8% for water content, 1.52% for porosity, 0.027 Mg/m3 for wet bulk density, and 0.3 for void ratio (box core 125). Millimeter variations of physical properties from horizontal 12‐cm‐long subcores indicate a maximum range of lateral variation of 18.2% for water content, 8% for porosity, 0.14 Mg/m3 for wet bulk density, and ∼ 0.6 for void ratio.

Silt

Void ratio

Physical property

Core sample

10.1080/10641199709379948

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Citations (6)

Comparison of pelagic and nepheloid layer marine snow: implications for carbon cycling

Marine Geology (1998)

Barbara Ransom Kevin F Shea P. J. Burkett Richard H. Bennett Roy J. Baerwald

Nepheloid layer

Marine snow

Terrigenous sediment

Pelagic sediment

Continental Margin

Deposition

Overprinting

10.1016/s0025-3227(98)00052-8

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Citations (69)

Continental Slope Sediment Instability Northeast of Wilmington Canyon

AAPG Bulletin (1977)

Bonnie A. McGregor Richard H. Bennett

A region on the U.S. East Coast exhibiting sediment instability is present on the continental margin seaward of the coast of Delaware and the Baltimore Canyon Trough area. A detailed bathymetric and seismic-reflection survey of a 7.5 by 13.0-km area, together with box, hydroplastic, and piston cores, affords an integrated study of a large submarine slide with a volume of 11 cu km on the continental slope northeast of Wilmington Canyon. The geotechnical properties and sedimentologic characteristics of the seafloor show variations that are associated with the slide. The slump block is believed to be composed of Pleistocene sediment with sediment failure occurring on the slope along a late Tertiary erosion surface which formed the gross morphology of the continental margin. he suggested mechanism for triggering the sediment failure is increased wave energy associated with a lower stand of sea level during the late Pleistocene. Mass wasting of material downslope by creep is a process which apparently still is occurring.

Continental Margin

10.1306/c1ea43a1-16c9-11d7-8645000102c1865d

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Citations (44)

In situ conditions and interactions between microbes and minerals in fine-grained marine sediments; a TEM microfabric perspective

American Mineralogist (1999)

Barbara Ransom Richard H. Bennett Roy J. Baerwald Matthew H. Hulbert Patti-Jo Burkett

Microbes, their exocellular secretions, and their impact on the mineralogy and microfabric of fine-grained continental margin sediments were investigated by transmission electron microscopy. Techniques were used that retained the in situ spatial relations of both bio-organic and mineralogical constituents. Photomicrographs were taken of characteristic mineral-microbe associations in the first meter of burial at conditions ranging from aerobic to anaerobic. Single-celled prokaryotes, prokaryotic colonies, and eukaryotic organisms were observed as were motile, sessile, and predatory species. Bacterial cells dominate the assemblage. The most commonly observed mineral-biological interaction was the surrounding, or close association, of isolated heterotrophic bacterial cells by clay minerals. Almost without exception, the external surfaces of the bacteria were covered with secreted exocellular slimes composed of cross-linked polysaccharide fibrils. These fibrils act to bind sediment grains into relatively robust microaggregates, roughly ≤ 25 μm in diameter. These exocellular polymers can significantly impact the interaction between microbes and minerals, as well as the chemical and physical transport of fluids and dissolved aqueous species through the sediment. Although pore water chemical profiles from the field sites studied have dissolved Fe and Mn, no close association was found between the microbes imaged and precipitated metal oxyhydroxides or other authigenic minerals, such as is commonly reported from laboratory cultures.

Authigenic

Gibbsite

10.2138/am-1999-1-220

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Citations (60)