Effects of a major typhoon on sediment accumulation in Fangliao Submarine Canyon, SW Taiwan

2012 ◽  
Vol 326-328 ◽  
pp. 116-130 ◽  
Author(s):  
Richard P. Hale ◽  
Charles A. Nittrouer ◽  
James T. Liu ◽  
Richard G. Keil ◽  
Andrea S. Ogston
Keyword(s):  
Sediment Accumulation ◽  
Submarine Canyon

scholarly journals Tectonic controls on nearshore sediment accumulation and submarine canyon morphology offshore La Jolla, Southern California

2010 ◽  
Vol 268 (1-4) ◽  
pp. 115-128 ◽  
Author(s):  
Nicolas Le Dantec ◽  
Leah J. Hogarth ◽  
Neal W. Driscoll ◽  
Jeffrey M. Babcock ◽  
Walter A. Barnhardt ◽  
...  
Keyword(s):  
Southern California ◽  
Sediment Accumulation ◽  
Submarine Canyon ◽  
La Jolla

Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses

1995 ◽  
Vol 86 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Alexander W. Tudhope ◽  
Terence P. Scoffin
Keyword(s):  
Water Depth ◽  
Sediment Resuspension ◽  
Sediment Accumulation ◽  
Submarine Canyon ◽  
Lophelia Pertusa ◽  
Channel System ◽  
Porcupine Seabight ◽  
Physical Measurements ◽  
Ne Atlantic Ocean ◽  
Manned Submersible

AbstractManned submersible dives were conducted in the submarine canyon channel system of Porcupine Seabight, NE Atlantic Ocean. Visual observations were made, and sediment samples collected and analysed to elucidate the nature of the sedimentary regime. In the upper part of the canyon (480-940 m water depth) sediments consisted of a mixture of terrigenous quartz rich silts and sands, skeletal carbonate of benthonic and planktonic origin and minor clay minerals and authigenic dolomite. There were localised Lophelia pertusa coral thickets on both the flanks and floor of the canyon. Sedimentary structures and physical measurements revealed there to be active transport of sediments in the canyon down to a depth of at least 940 m, effected by (?tidal) reversing currents and bioturbation. In these parts of the canyon, deposits around glacial dropstones and coral thickets indicate that there has been a maximum of 0-1 m of net sediment accumulation since the last glacial period. At 3000 m water depth, in the channel system, the sediments were fine calcareous ooze with a drape (up to 0-3 m thick) of flocculant phytoplankton detritus. At these depths, there was no evidence for present-day sediment resuspension by currents.

scholarly journals RECENT SEDIMENTARY PROCESSES IN THE WESTERN GULF OF CORINTH, GREECE: SEISMIC AND ASEISMIC TURBITIDES

2017 ◽  
Vol 50 (1) ◽  
pp. 383
Author(s):  
S. Sergiou ◽  
A. Beckers ◽  
M. Geraga ◽  
G. Papatheodorou ◽  
I. Iliopoulos ◽  
...  
Keyword(s):  
Sediment Cores ◽  
Sediment Accumulation ◽  
Submarine Canyon ◽  
Seismic Events ◽  
Mass Movements ◽  
Sedimentary Processes ◽  
Gulf Of Corinth ◽  
Active Tectonic ◽  
Geochemical Analyses ◽  
Seismic Origin

The Corinth rift is counted among the most active tectonic grabens in the world, with extension rates up to 15 mm/yr (Western part). These high extension rates are associated with very strong seismic events that are, occasionally, responsible for submarine mass movements. These movements, their consequential bottom currents, and the differential river-discharging sediment accumulation in the whole gulf, strongly affect the modern marine sedimentary processes. The definition and understanding of these processes is the main aim of this project. This is attempted through via sedimentological, mineral and geochemical analyses on sediment samples from two ~1.1 m long, sediment cores from a WE submarine canyon (10 km long, 3 km wide) that lies in the Western tip of the gulf. The general sedimentation motif reveals the presence of hemipelagic deposits which are occasionally interrupted by sandy turbidites. Occasionally, these turbidites seem to have seismic origin. The sedimentation rates range between 2.57 mm/yr in the western part and 0.67 mm/yr in the eastern part.

scholarly journals Flood and tides trigger longest measured sediment flow that accelerates for thousand kilometers into deep-sea

2022 ◽  
Author(s):  
Peter Talling ◽  
Megan Baker ◽  
Ed Pope ◽  
Ricardo Silva Jacinto ◽  
Maarten Heijnen ◽  
...  
Keyword(s):  
Deep Sea ◽  
Sediment Accumulation ◽  
River Mouth ◽  
Climate Change Impacts ◽  
Submarine Canyon ◽  
Turbidity Currents ◽  
Carbon Transfer ◽  
Major River ◽  
One Year ◽  
Flushing Flows

Abstract Here we document for the first time how major rivers connect directly to the deep-sea, by analysing the longest runout sediment flows (of any type) yet measured in action. These seafloor turbidity currents originated from the Congo River-mouth, with one flow travelling >1,130 km whilst accelerating from 5.2 to 8.0 m/s. In one year, these turbidity currents eroded 1-2 km3 of sediment from just one submarine canyon, equivalent to 14-28% of the annual global-flux from rivers. It was known earthquakes trigger canyon-flushing flows. We show major river-floods also generate canyon-flushing flows, primed by rapid sediment-accumulation at the river-mouth, but triggered by spring tides weeks to months after the flood. This is also the first field-confirmation that turbidity currents which erode can self-accelerate, thereby travelling much further. These observations explain highly-efficient organic carbon transfer, and have important implications for hazards to seabed cables, or how terrestrial climate change impacts the deep-sea.

Subsurface stratigraphy and basin-fill architecture of the late Paleozoic eastern Taos trough, northern New Mexico, U.S.A.

2020 ◽  
Vol 57 (3) ◽  
pp. 149-176
Author(s):  
Nur Uddin Md Khaled Chowdhury ◽  
Dustin E. Sweet
Keyword(s):  
New Mexico ◽  
Sediment Accumulation ◽  
Late Paleozoic ◽  
North Central ◽  
The North ◽  
Basement Rocks ◽  
Basin Geometry ◽  
Deformation Event ◽  
Thrust System ◽  
Basin Fill

The greater Taos trough located in north-central New Mexico represents one of numerous late Paleozoic basins that formed during the Ancestral Rocky Mountains deformation event. The late Paleozoic stratigraphy and basin geometry of the eastern portion of the greater Taos trough, also called the Rainsville trough, is little known because the strata are all in the subsurface. Numerous wells drilled through the late Paleozoic strata provide a scope for investigating subsurface stratigraphy and basin-fill architecture of the Rainsville trough. Lithologic data obtained predominantly from petrophysical well logs combined with available biostratigraphic data from the greater Taos trough allows construction of a chronostratigraphic framework of the basin fill. Isopach- and structure-maps indicate that the sediment depocenter was just east of the El Oro-Rincon uplift and a westerly thickening wedge-shaped basin-fill geometry existed during the Pennsylvanian. These relationships imply that the thrust system on the east side of the Precambrian-cored El Oro-Rincon uplift was active during the Pennsylvanian and segmented the greater Taos trough into the eastern Rainsville trough and the western Taos trough. During the Permian, sediment depocenter(s) shifted more southerly and easterly and strata onlap Precambrian basement rocks of the Sierra Grande uplift to the east and Cimarron arch to the north of the Rainsville trough. Permian strata appear to demonstrate minimal influence by faults that were active during the Pennsylvanian and sediment accumulation occurred both in the basinal area as well as on previous positive-relief highlands. A general Permian decrease in eustatic sea level and cessation of local-fault-controlled subsidence indicates that regional subsidence must have affected the region in the early Permian.

Submerged Macrophyte Control Using Plastic Blankets

1994 ◽  
Vol 29 (4) ◽  
pp. 119-126
Author(s):  
D. R. Carter ◽  
S. Carter ◽  
J. L. Allen
Keyword(s):  
Plant Species ◽  
Sediment Accumulation ◽  
Submerged Macrophyte ◽  
Light Reduction ◽  
Control Options ◽  
Macrophyte Growth ◽  
Gravel Pits ◽  
End Use ◽  
Potential Area

Penrith Lakes Scheme is concerned with the rehabilitation of gravel pits to create a system of large recreational lakes. A potential submerged macrophyte problem has been identified in an existing man-made lake. The need to control the macrophytes is dependent on the proposed end use of the lakes and the potential area of invasion. A variety of control options were assessed. Plastic blankets were tested to determine their effectiveness in controlling macrophyte growth specifically in swimming and boat access areas. Comparisons of clear, black and black woven blankets were conducted. Experiments revealed that 90% of the plants under the black and black woven blankets died within six weeks. Under clear blankets plants were reduced by between 20%-90%. Analysis showed that significant interactions occurred between sites and treatments and times, from which it can be inferred that none are independent of each other. Success in the reduction of macrophytes appears dependent on such factors as plant species, sediment accumulation and light reduction.

Sign in / Sign up

Export Citation Format

Share Document