Key future directions for research on turbidity currents and their deposits
| Autor: | Philip R. Hill, Frank J. Peel, R. W. C. Arnott, Ernst W. M. Hansen, Hajime Naruse, Jingping Xu, John E. Hughes Clarke, Alessandro Mozzato, Sam Parkinson, Peter James Rowley, Esther J. Sumner, George Postma, Jacob A. Covault, Joshua R. Allin, Christopher J. Stevenson, Matthieu J.B. Cartigny, Richard N. Hiscott, Zane R. Jobe, Camilla Watts, David J.W. Piper, Peter J. Talling, Stéphanie Girardclos, Ed Pope, Andrew J. Hogg, Fabrizio Felletti, Michael A. Clare, Zoltán Sylvester, Giuseppe Malgesini, Andrea Sguazzini, D.A. Armitage |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Bedform
Turbidity current Monterey Canyon Submarine Earth science Canyon review Hydraulic jumps Lac Léman ddc:550 Sediment gravity flow Sediment flow process ddc:333.7-333.9 geography geography.geographical_feature_category River delta Geology Channel Sublacustrine Bedforma Turbidite Oceanography turbidite Earth Sciences Courant de turbidité Sediment Submarine pipeline Turdidity current Sédiment |
| Zdroj: | Talling, P, Allin, J, Armitage, D, Arnott, R, Cartigny, M, Clare, M, Felletti, F, Covault, J, Girardclos, S, Ernst, H, Hill, P, Hiscott, R, Hogg, A, Hughes Clarke, J, Jobe, Z, Malgesini, G, Mozzato, A, Naruse, H, Parkinson, S, Peel, F, Piper, D, Pope, E, Postma, G, Rowley, P J, Sguazzini, A, Stevenson, C, Sumner, E, Sylvester, Z, Watts, C & Xu, J 2015, ' Key future directions for research on turbidity currents and their deposits ', Journal of Sedimentary Research, vol. 85, no. 2, pp. 153-169 . https://doi.org/10.2110/jsr.2015.03 Journal of Sedimentary Research, Vol. 85, No 2 (2015) pp. 153-169 |
| ISSN: | 1527-1404 |
| DOI: | 10.2110/jsr.2015.03 |
| Popis: | Turbidity currents, and other types of submarine sediment density flow, redistribute more sediment across the surface of the Earth than any other sediment flow process, yet their sediment concentration has never been measured directly in the deep ocean. The deposits of these flows are of societal importance as imperfect records of past earthquakes and tsunamogenic landslides and as the reservoir rocks for many deep-water petroleum accumulations. Key future research directions on these flows and their deposits were identified at an informal workshop in September 2013. This contribution summarizes conclusions from that workshop, and engages the wider community in this debate. International efforts are needed for an initiative to monitor and understand a series of test sites where flows occur frequently, which needs coordination to optimize sharing of equipment and interpretation of data. Direct monitoring observations should be combined with cores and seismic data to link flow and deposit character, whilst experimental and numerical models play a key role in understanding field observations. Such an initiative may be timely and feasible, due to recent technological advances in monitoring sensors, moorings, and autonomous data recovery. This is illustrated here by recently collected data from the Squamish River delta, Monterey Canyon, Congo Canyon, and offshore SE Taiwan. A series of other key topics are then highlighted. Theoretical considerations suggest that supercritical flows may often occur on gradients of greater than ∼ 0.6°. Trains of up-slope-migrating bedforms have recently been mapped in a wide range of marine and freshwater settings. They may result from repeated hydraulic jumps in supercritical flows, and dense (greater than approximately 10% volume) near-bed layers may need to be invoked to explain transport of heavy (25 to 1,000 kg) blocks. Future work needs to understand how sediment is transported in these bedforms, the internal structure and preservation potential of their deposits, and their use in facies prediction. Turbulence damping may be widespread and commonplace in submarine sediment density flows, particularly as flows decelerate, because it can occur at low ( |
| Databáze: | OpenAIRE |
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