Delivering Terrestrial Sediment to Continental Slopes:
The main mechanisms for moving large volumes of sediment to, and down continental slopes include 1) Sediment delivery by hypopycnal-plumes: effective on wide shelves when sea level is near the shelf-slope break. The mechanism is effective for higher stages of sea level if the shelf is narrow and dis...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.634.8500 2023-05-15T18:18:35+02:00 Delivering Terrestrial Sediment to Continental Slopes: James P. M. Syvitski Eric W. H. Hutton James P M Syvitski The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.8500 http://www.searchanddiscovery.com/documents/2009/50166syvitski/ndx_syvitski.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.8500 http://www.searchanddiscovery.com/documents/2009/50166syvitski/ndx_syvitski.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.searchanddiscovery.com/documents/2009/50166syvitski/ndx_syvitski.pdf An Overview of Mechanisms text 2009 ftciteseerx 2016-01-08T15:39:20Z The main mechanisms for moving large volumes of sediment to, and down continental slopes include 1) Sediment delivery by hypopycnal-plumes: effective on wide shelves when sea level is near the shelf-slope break. The mechanism is effective for higher stages of sea level if the shelf is narrow and discharge is large, and is affected by the magnitude of the discharge, Coriolis deflection, winds, and Ekman transport. 2) Hyperpycnal discharge: limited to small and medium-sized rivers that drain mountainous terrain capable of generating hyper-elevated sediment concentrations. 3) Sediment gravity flows generated through wave-current interactions on relatively steep continental shelves that are subjected to ocean storms. Upwelling versus downwelling conditions are important constraints. 4) Density-cascading where shelf water is made hyper-dense, flows off the shelf, converging and accelerating. Shelf waters are made dense through cooling (e.g., cold winds), or through salinity enhancement (e.g., evaporation through winds, brine rejection under sea-ice). These bottom boundary currents can effectively erode the seafloor and carry sediment downslope either as a tractive current, or through conversion to a turbidity current. 5) Sediment failure may result from sediment loading and/or oversteepening of the upper-slope deposits. Subsurface drainage and ground accelerations can greatly influence the size and extent of the failure surface. The failed sediment mass will transition to either a debris flows or turbidity current. 6) Theory also suggests that internal waves breaking on the upper slope may also mobilize seafloor sediment. Many other mechanisms can influence the transport Text Sea ice Unknown |
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English |
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An Overview of Mechanisms |
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An Overview of Mechanisms James P. M. Syvitski Eric W. H. Hutton James P M Syvitski Delivering Terrestrial Sediment to Continental Slopes: |
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An Overview of Mechanisms |
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The main mechanisms for moving large volumes of sediment to, and down continental slopes include 1) Sediment delivery by hypopycnal-plumes: effective on wide shelves when sea level is near the shelf-slope break. The mechanism is effective for higher stages of sea level if the shelf is narrow and discharge is large, and is affected by the magnitude of the discharge, Coriolis deflection, winds, and Ekman transport. 2) Hyperpycnal discharge: limited to small and medium-sized rivers that drain mountainous terrain capable of generating hyper-elevated sediment concentrations. 3) Sediment gravity flows generated through wave-current interactions on relatively steep continental shelves that are subjected to ocean storms. Upwelling versus downwelling conditions are important constraints. 4) Density-cascading where shelf water is made hyper-dense, flows off the shelf, converging and accelerating. Shelf waters are made dense through cooling (e.g., cold winds), or through salinity enhancement (e.g., evaporation through winds, brine rejection under sea-ice). These bottom boundary currents can effectively erode the seafloor and carry sediment downslope either as a tractive current, or through conversion to a turbidity current. 5) Sediment failure may result from sediment loading and/or oversteepening of the upper-slope deposits. Subsurface drainage and ground accelerations can greatly influence the size and extent of the failure surface. The failed sediment mass will transition to either a debris flows or turbidity current. 6) Theory also suggests that internal waves breaking on the upper slope may also mobilize seafloor sediment. Many other mechanisms can influence the transport |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
James P. M. Syvitski Eric W. H. Hutton James P M Syvitski |
author_facet |
James P. M. Syvitski Eric W. H. Hutton James P M Syvitski |
author_sort |
James P. M. Syvitski |
title |
Delivering Terrestrial Sediment to Continental Slopes: |
title_short |
Delivering Terrestrial Sediment to Continental Slopes: |
title_full |
Delivering Terrestrial Sediment to Continental Slopes: |
title_fullStr |
Delivering Terrestrial Sediment to Continental Slopes: |
title_full_unstemmed |
Delivering Terrestrial Sediment to Continental Slopes: |
title_sort |
delivering terrestrial sediment to continental slopes: |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.8500 http://www.searchanddiscovery.com/documents/2009/50166syvitski/ndx_syvitski.pdf |
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Sea ice |
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Sea ice |
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http://www.searchanddiscovery.com/documents/2009/50166syvitski/ndx_syvitski.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.8500 http://www.searchanddiscovery.com/documents/2009/50166syvitski/ndx_syvitski.pdf |
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1766195212533628928 |