How Fast or How Many? Sources of Intermittent Sediment Transport
Near the threshold of grain motion, sediment transport is “on‐off” intermittent, characterized by large but rare bursts separated by long periods of low transport. Without models that can account for the effects of intermittency, measurements of average sediment flux can be in error by up to an orde...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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American Geophysical Union
2024
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| Online Access: | https://hdl.handle.net/1721.1/153531 |
| _version_ | 1811092536202100736 |
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| author | Benavides, Santiago J. Deal, Eric Venditti, Jeremy G. Bradley, Ryan Zhang, Qiong Kamrin, Ken Perron, J. Taylor |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Benavides, Santiago J. Deal, Eric Venditti, Jeremy G. Bradley, Ryan Zhang, Qiong Kamrin, Ken Perron, J. Taylor |
| author_sort | Benavides, Santiago J. |
| collection | MIT |
| description | Near the threshold of grain motion, sediment transport is “on‐off” intermittent, characterized by large but rare bursts separated by long periods of low transport. Without models that can account for the effects of intermittency, measurements of average sediment flux can be in error by up to an order of magnitude. Despite its known presence and impact, it is not clear whether on‐off intermittency arises from the grain activity (the number of moving grains) or grain velocities, which together determine the sediment flux. We use laboratory flume experiments to show that the on‐off intermittency has its origins in the velocity distributions of grains that move by rolling along the bed, whereas grain activity is not on‐off intermittent. Incorporating the types of intermittency we identify into stochastic models of sediment transport could yield improved predictions of sediment flux, including physically based estimates of the uncertainty in time‐averaged sediment flux. |
| first_indexed | 2024-09-23T15:19:46Z |
| format | Article |
| id | mit-1721.1/153531 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:19:46Z |
| publishDate | 2024 |
| publisher | American Geophysical Union |
| record_format | dspace |
| spelling | mit-1721.1/1535312024-09-20T18:36:57Z How Fast or How Many? Sources of Intermittent Sediment Transport Benavides, Santiago J. Deal, Eric Venditti, Jeremy G. Bradley, Ryan Zhang, Qiong Kamrin, Ken Perron, J. Taylor Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology. Department of Mechanical Engineering General Earth and Planetary Sciences Geophysics Near the threshold of grain motion, sediment transport is “on‐off” intermittent, characterized by large but rare bursts separated by long periods of low transport. Without models that can account for the effects of intermittency, measurements of average sediment flux can be in error by up to an order of magnitude. Despite its known presence and impact, it is not clear whether on‐off intermittency arises from the grain activity (the number of moving grains) or grain velocities, which together determine the sediment flux. We use laboratory flume experiments to show that the on‐off intermittency has its origins in the velocity distributions of grains that move by rolling along the bed, whereas grain activity is not on‐off intermittent. Incorporating the types of intermittency we identify into stochastic models of sediment transport could yield improved predictions of sediment flux, including physically based estimates of the uncertainty in time‐averaged sediment flux. 2024-02-15T21:43:32Z 2024-02-15T21:43:32Z 2023-05 2024-02-15T21:38:08Z Article http://purl.org/eprint/type/JournalArticle 0094-8276 1944-8007 https://hdl.handle.net/1721.1/153531 Benavides, S. J., Deal, E., Venditti, J. G., Bradley, R., Zhang, Q., Kamrin, K., & Perron, J. T. (2023). How fast or how many? Sources of intermittent sediment transport. Geophysical Research Letters, 50, e2022GL101919. en 10.1029/2022gl101919 Geophysical Research Letters Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ application/pdf American Geophysical Union American Geophysical Union |
| spellingShingle | General Earth and Planetary Sciences Geophysics Benavides, Santiago J. Deal, Eric Venditti, Jeremy G. Bradley, Ryan Zhang, Qiong Kamrin, Ken Perron, J. Taylor How Fast or How Many? Sources of Intermittent Sediment Transport |
| title | How Fast or How Many? Sources of Intermittent Sediment Transport |
| title_full | How Fast or How Many? Sources of Intermittent Sediment Transport |
| title_fullStr | How Fast or How Many? Sources of Intermittent Sediment Transport |
| title_full_unstemmed | How Fast or How Many? Sources of Intermittent Sediment Transport |
| title_short | How Fast or How Many? Sources of Intermittent Sediment Transport |
| title_sort | how fast or how many sources of intermittent sediment transport |
| topic | General Earth and Planetary Sciences Geophysics |
| url | https://hdl.handle.net/1721.1/153531 |
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