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Drilling into the seabed beneath Earth’s most powerful ocean current（图）
climate change seabed beneath Earth powerful ocean current
2019/10/30
The Antarctic Circumpolar Current is the planet's most powerful and arguably most important current. It is the only current to flow clear around the globe without being diverted by any landmass.It con...
Seabed Fluid Flow—The Impact on Geology,Biology and the Marine Environment
Seabed Fluid Flow Geology Biology Marine Environment
2015/7/22
When their previous book Seabed Pockmarks and Seepages was published in 1988, Martin Hovland and Alan Judd were the first authors to illustrate and discuss global geological, geophysical, chemical, an...
Development of Miniature Full Flow and Model Pipeline Probes for Testing of Box Core Samples of Surficial Seabed Sediments
box core sampling of seabed sediments cyclic t-bar testing full flow penetrometers intact and remolded undrained shear strength t-bar and ball toroid and model pipeline testing
2014/11/4
The box corer is a relatively new tool used in the geotechnical community for collection of soft seabed sediments. Miniature full flow and model pipeline probes were developed as tools to characterize...
Seabed foraging by Antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron
Seabed foraging by Antarctic krill Implications for stock assessment bentho-pelagic coupling the vertical transfer of iron
2014/4/8
A compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar...
Mapping of seabed morphology and shallow sediment structure of the Mauritania continental margin,Northwest Africa:some implications for geohazard potential
seabed morphology shallow sediment structure Mauritania continental margin geohazard potential
2009/12/3
Seafloor mapping of the Mauritania margin by multibeam bathymetry as well as shallow and high-resolution seismics in combination with core data has revealed a wide variety of seafloor features, which ...
Extensive local seabed disturbance,erosion and mass wasting on Alpha Ridge,Central Arctic Ocean:possible evidence for an extra-terrestrial impact?
local seabed disturbance Central Arctic Ocean possible evidence extra-terrestrial impact
2009/12/2
Sub-bottom sediments within a 200 x 600 km area on the crest and south slope (water depth 1200-2500 meter) of the submarine Alpha Ridge in the central Arctic Ocean have been locally disrupted down to ...
Physical and chemical traces of anthropogenic influence at the seabed and in the sediments in Ingøydjupet,Southern Barents Sea
Physical and chemical traces anthropogenic influence sediments
2009/12/2
The MAREANO programme (2006 – 2010) has collected video-footage and surface sediment samples in the Southern Barents Sea during the cruise in 2006. The sampled marine areas included Ingøydjupet...
Sediment distribution and seabed processes in the Troms II area-offshore North Norway
Sediment distribution seabed processes Troms II area
2009/12/2
As part of the MAREANO-programme, multibeam bathymetry and backscatter, sediment samples, pictures and video data have been interpreted to produce maps of geological terrain forms, seabed reflectivity...
Developing seabed nature-type maps offshore Norway:initial results from the MAREANO programme
habitat benthic multivariate DCA multibeam terrain analysis classification
2009/12/2
Maps showing the distribution of seabed nature types, or habitats, are an important component of regional seabed mapping, such as in Norway’s‘MAREANO’ programme. This is particularly the case when eco...
Long waves over a bi-viscous seabed:transverse patterns
Long waves bi-viscous seabed transverse patterns
2009/11/12
The coupled interaction of long standing hydrodynamic waves with a deformable non-Newtonian seabed is examined using a two-layer model for which the upper layer fluid is inviscid and the lower layer i...
Seabed Stresses in Combined Wave and Steady Flow Conditions on the Nova Scotia Continental Shelf：Field Measurements and Predictions
Seabed Stresses Combined Wave Steady Flow Continental Shelf
2009/1/5
A tripod holding electromagnetic flowmeters at two heights within 1 m above the seabed has been deployed at two shallow sites (25 and 45 m depths) on the continental shelf off Nova Scotia, Canada. Wav...
A Modified Inertial Dissipation Method for Estimating Seabed Stresses at Low Reynolds Numbers, with Application to Wave/Current Boundary Layer Measurements
Inertial Dissipation Method Low Reynolds Numbers Seabed Stresses Wave/Current Boundary Layer Measurements
2009/1/5
The inertial dissipation method for estimating seabed friction velocities from near-bed turbulence spectra requires few measurements; it is relatively insensitive to errors in sensor orientation and m...
Developing the Mineral Resources of the Seabed
Mineral Resources Seabed economic well-being
2008/12/17
The world’s oceans have played a vital role in the development of
virtually every nation. They provide the transportation network that
binds us together through trade; they yield much of the food th...
Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.
surface piercing propeller boundary element method hydrodynamic characteristics
2011/9/13
Demand for high-speed marine vehicles (HSMVs) is high among both commercial and naval users. It is the duty of the marine vessel’s designer to provide a hull and propulsion system that diminishes drag...
A shallow scattering layer: High-resolution acoustic analysis of nocturnal vertical migration from the seabed
A shallow scattering layer High-resolution acoustic analysis nocturnal vertical migration the seabed
2014/5/20
Using bottom-mounted, high-frequency, inverted echo sounders (the Tracor acoustic profiling system) to examine acoustic backscattering every 2 min in 50-cm range bins above the seabed, we recorded str...