1,721,022 research outputs found
Submarine channel initiation, filling and maintenance from sea‐floor geomorphology and morphodynamic modelling of cyclic steps
No full textDeep-water channel evolution in the Quaternary Lucia Chica channel system, offshore central California
No full textCyclic steps and related supercritical bedforms: Building blocks of deep-water depositional systems, western North America
No full textExploring a new breadth of cyclic steps on distal submarine fans
No full textResearch on the depositional record of submarine fans and related turbidite
systems has highlighted the importance of channel, lobe and lev ́ee–overbank
architectural elements as fundamental building blocks. However, many of
the characteristics and processes of deposits left by flows traversing those
fans remain elusive, because flows seem to be able to go unconfined for long
distances. Offshore southern California (USA), the La Jolla Canyon decreases
in relief to become an approximately U-shaped channel across the basin
floor of the San Diego Trough. The La Jolla Channel gradually loses confinement
and transitions to a network of scours, some of which align to form
incipient channels, and fields of bedforms. High-resolution seafloor topography,
CHIRP seismic-reflection data, sediment cores and hydrodynamic flow
analysis are used to explore these features. The focus is on two regions of
bedforms: (i) a field of net-depositional, concentric bedforms across the eastern
lev ́ee–overbank upstream from the terminus of the La Jolla Channel; and
(ii) a linear train of more erosional bedforms approximating an incipient
channel adjacent to the present mouth of the La Jolla Channel. These bedforms
are interpreted to be among a class of upper-flow-regime bedforms
called cyclic steps, which were formed by densimetric Froude supercritical
turbidity currents that spilled out of the present La Jolla Channel. The highresolution
data for the La Jolla Fan provide valuable insights into the characteristics
of supercritical bedforms likely common to distal submarine fans, as
well as on sedimentary processes likely important for submarine fan growth
into sedimentary basins. In particular, the pattern of evolution of the La Jolla
Fan suggests that cyclic steps with wavelengths on the order of tens of
metres to a few hundreds of metres could be fundamentally important for
the evolution of the distal submarine fans with relatively low-relief main
channels
Deep-sea channel evolution and stratigraphic architecture from inception to abandonment from high-resolution Autonomous Underwater vehicle surveys offshore central California
No full textThe elusive character of discontinuous deep-water channels: New insights from Lucia Chica channel system, offshore California
No full textUnraveling the channel-lobe transition zone with high-resolution AUV bathymetry: Navy Fan, offshore Baja California, Mexico
No full textSubmarine-Fan development revealed by integrated high-resolution dataset from La Jolla Fan, offshore California
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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