Statistics of bedload transport over steep slopes: Separation of time scales and collective motion
Steep slope streams show large fluctuations of sediment discharge across several time scales. These fluctuations may be inherent to the internal dynamics of the sediment transport process. A probabilistic framework thus seems appropriate to analyze such a process. In this paper, we present an experi...
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| Veröffentlicht in: | Geophysical research letters 2013-01, Vol.40 (1), p.128-133 |
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| creator | Heyman, J. Mettra, F. Ma, H. B. Ancey, C. |
| description | Steep slope streams show large fluctuations of sediment discharge across several time scales. These fluctuations may be inherent to the internal dynamics of the sediment transport process. A probabilistic framework thus seems appropriate to analyze such a process. In this paper, we present an experimental study of bedload transport over a steep slope flume for small to moderate Shields numbers. The sampling technique allows the acquisition of high‐resolution time series of the solid discharge. The resolved time scales range from 10− 1 s up to 105 s. We show that two distinct time scales can be observed in the probability density function for the waiting time between moving particles. We make the point that the separation of time scales is related to collective dynamics. Proper statistics of a Markov process including collective entrainment are derived. The separation of time scales is recovered theoretically for low entrainment rates.
Key points
Review of the possible physical origins for collective dynamics in bedload.
Experimental results of bedload transport over a steep slope flume.
Theoretical analysis of a stochastic model and comparison with experiments. |
| doi_str_mv | 10.1029/2012GL054280 |
| format | Article |
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Key points
Review of the possible physical origins for collective dynamics in bedload.
Experimental results of bedload transport over a steep slope flume.
Theoretical analysis of a stochastic model and comparison with experiments.</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1029/2012GL054280</identifier><identifier>CODEN: GPRLAJ</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>Bed load ; bedload ; Earth sciences ; Earth, ocean, space ; Entrainment ; Environmental Sciences ; Exact sciences and technology ; Fluctuations ; Markov processes ; Meteorology ; Sediment discharge ; Sediment transport ; Statistics ; time scales ; Transport processes</subject><ispartof>Geophysical research letters, 2013-01, Vol.40 (1), p.128-133</ispartof><rights>2012. American Geophysical Union. All Rights Reserved.</rights><rights>2014 INIST-CNRS</rights><rights>2013. American Geophysical Union. All Rights Reserved.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4693-92547cd06bed6ac755597258836a18df4880daf051b3a3cfe33def87e8ab8e133</citedby><cites>FETCH-LOGICAL-a4693-92547cd06bed6ac755597258836a18df4880daf051b3a3cfe33def87e8ab8e133</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2012GL054280$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2012GL054280$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,315,782,786,887,1419,1435,11523,27933,27934,45583,45584,46418,46477,46842,46901</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27888576$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://hal.science/hal-03018834$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Heyman, J.</creatorcontrib><creatorcontrib>Mettra, F.</creatorcontrib><creatorcontrib>Ma, H. B.</creatorcontrib><creatorcontrib>Ancey, C.</creatorcontrib><title>Statistics of bedload transport over steep slopes: Separation of time scales and collective motion</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>Steep slope streams show large fluctuations of sediment discharge across several time scales. These fluctuations may be inherent to the internal dynamics of the sediment transport process. A probabilistic framework thus seems appropriate to analyze such a process. In this paper, we present an experimental study of bedload transport over a steep slope flume for small to moderate Shields numbers. The sampling technique allows the acquisition of high‐resolution time series of the solid discharge. The resolved time scales range from 10− 1 s up to 105 s. We show that two distinct time scales can be observed in the probability density function for the waiting time between moving particles. We make the point that the separation of time scales is related to collective dynamics. Proper statistics of a Markov process including collective entrainment are derived. The separation of time scales is recovered theoretically for low entrainment rates.
Key points
Review of the possible physical origins for collective dynamics in bedload.
Experimental results of bedload transport over a steep slope flume.
Theoretical analysis of a stochastic model and comparison with experiments.</description><subject>Bed load</subject><subject>bedload</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Entrainment</subject><subject>Environmental Sciences</subject><subject>Exact sciences and technology</subject><subject>Fluctuations</subject><subject>Markov processes</subject><subject>Meteorology</subject><subject>Sediment discharge</subject><subject>Sediment transport</subject><subject>Statistics</subject><subject>time scales</subject><subject>Transport processes</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNp9kV1rFDEUhoMouFbv_AEB8UJw9ORrkvGurXUrDIptpZchmzmDU2c30yTd2n9vhimLV14lhOd9OOcNIa8ZfGDAm48cGF-3oCQ38ISsWCNlZQD0U7ICaMqd6_o5eZHSDQAIEGxFNpfZ5SHlwScaerrBbgyuozm6XZpCzDTsMdKUESeaxjBh-kQvcXKxpMJujuRhizR5N2KibtdRH8YRfR72SLdhhl6SZ70bE756PI_Izy9nV6fnVft9_fX0uK2crBtRNVxJ7Tuoywy181op1WiujBG1Y6brpTHQuR4U2wgnfI9CdNgbjcZtDDIhjsi7xfvLjXaKw9bFBxvcYM-PWzu_lZVZ0ck9K-ybhZ1iuL3DlO1NuIu7Mp5lteTApTZ1od4vlI8hpYj9QcvAzo3bfxsv-NtHqZv76EuHfkiHDNfGGKVnLV-4-2HEh_867fqiVQD1vF21hMpn4Z9DyMXfttZCK3v9bW2vPjcnF9fNif0h_gIXjp1O</recordid><startdate>20130116</startdate><enddate>20130116</enddate><creator>Heyman, J.</creator><creator>Mettra, F.</creator><creator>Ma, H. B.</creator><creator>Ancey, C.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope></search><sort><creationdate>20130116</creationdate><title>Statistics of bedload transport over steep slopes: Separation of time scales and collective motion</title><author>Heyman, J. ; Mettra, F. ; Ma, H. B. ; Ancey, C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4693-92547cd06bed6ac755597258836a18df4880daf051b3a3cfe33def87e8ab8e133</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Bed load</topic><topic>bedload</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Entrainment</topic><topic>Environmental Sciences</topic><topic>Exact sciences and technology</topic><topic>Fluctuations</topic><topic>Markov processes</topic><topic>Meteorology</topic><topic>Sediment discharge</topic><topic>Sediment transport</topic><topic>Statistics</topic><topic>time scales</topic><topic>Transport processes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Heyman, J.</creatorcontrib><creatorcontrib>Mettra, F.</creatorcontrib><creatorcontrib>Ma, H. B.</creatorcontrib><creatorcontrib>Ancey, C.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Heyman, J.</au><au>Mettra, F.</au><au>Ma, H. B.</au><au>Ancey, C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Statistics of bedload transport over steep slopes: Separation of time scales and collective motion</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2013-01-16</date><risdate>2013</risdate><volume>40</volume><issue>1</issue><spage>128</spage><epage>133</epage><pages>128-133</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>Steep slope streams show large fluctuations of sediment discharge across several time scales. These fluctuations may be inherent to the internal dynamics of the sediment transport process. A probabilistic framework thus seems appropriate to analyze such a process. In this paper, we present an experimental study of bedload transport over a steep slope flume for small to moderate Shields numbers. The sampling technique allows the acquisition of high‐resolution time series of the solid discharge. The resolved time scales range from 10− 1 s up to 105 s. We show that two distinct time scales can be observed in the probability density function for the waiting time between moving particles. We make the point that the separation of time scales is related to collective dynamics. Proper statistics of a Markov process including collective entrainment are derived. The separation of time scales is recovered theoretically for low entrainment rates.
Key points
Review of the possible physical origins for collective dynamics in bedload.
Experimental results of bedload transport over a steep slope flume.
Theoretical analysis of a stochastic model and comparison with experiments.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2012GL054280</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Bed load bedload Earth sciences Earth, ocean, space Entrainment Environmental Sciences Exact sciences and technology Fluctuations Markov processes Meteorology Sediment discharge Sediment transport Statistics time scales Transport processes |
| title | Statistics of bedload transport over steep slopes: Separation of time scales and collective motion |
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