| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Direct monitoring reveals initiation of turbidity currents from extremely dilute river plumes
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| Autores: |
Hage, Sophie
Cartigny, Matthieu J.b.
Sumner, Esther J.
Clare, Michael A.
Hughes Clarke, John E.
Talling, Peter J.
Lintern, D. Gwyn
Simmons, Stephen M.
Silva Jacinto, Ricardo
Vellinga, Age J.
Allin, Joshua R.
Azpiroz‐zabala, Maria
Gales, Jenny A.
Hizzett, Jamie L.
Hunt, James E.
Mozzato, Alessandro
Parsons, Daniel R.
Pope, Ed L.
Stacey, Cooper D.
Symons, William O.
Vardy, Mark E.
Watts, Camilla
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| Data: |
2019-10
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| Ano: |
2019
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| Resumo: |
Rivers (on land) and turbidity currents (in the ocean) are the most important sediment transport processes on Earth. Yet, how rivers generate turbidity currents as they enter the coastal ocean remains poorly understood. The current paradigm, based on laboratory experiments, is that turbidity currents are triggered when river plumes exceed a threshold sediment concentration of ~1 kg.m‐3. Here we present direct observations of an exceptionally dilute river‐plume, with sediment concentrations one order of magnitude below this threshold (0.07 kg.m‐3), which generated a fast (1.5 m.s‐1), erosive, short‐lived (6 min) turbidity current. However, no turbidity current occurred during subsequent river‐plumes. We infer that turbidity currents are generated when fine‐sediment, accumulating in a tidal turbidity maximum, is released during spring tide. This means that very dilute river‐plumes can generate turbidity currents more frequently and in a wider range of locations, than previously thought.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00514/62594/66952.pdf
https://archimer.ifremer.fr/doc/00514/62594/66954.pdf
DOI:10.1029/2019GL084526
https://archimer.ifremer.fr/doc/00514/62594/
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| Editor: |
American Geophysical Union (AGU)
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| Formato: |
application/pdf
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| Fonte: |
Geophysical Research Letters (0094-8276) (American Geophysical Union (AGU)), 2019-10 , Vol. 46 , N. 20 , P. 11310-11320
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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