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Effect of bed morphology on flow mixing length at river confluences
MIXING processes at river confluences have an important bearing on problems such as pollutant dispersal and the management of river systems, but remain poorly understood. Previous studies 1–11 have indicated that flow mixing downstream of a confluence is a slow process, typically completed at distan...
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| Published in: | Nature (London) 1995-01, Vol.373 (6510), p.138-139 |
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| Main Authors: | , |
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| Language: | English |
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| cites | cdi_FETCH-LOGICAL-a517t-175a1839f74e9349e149243a2f72616b87202a6495f2e942d32351fddea4eb043 |
| container_end_page | 139 |
| container_issue | 6510 |
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| container_title | Nature (London) |
| container_volume | 373 |
| creator | Gaudet, Jocelyn M Roy, André G |
| description | MIXING processes at river confluences have an important bearing on problems such as pollutant dispersal and the management of river systems, but remain poorly understood. Previous studies
1–11
have indicated that flow mixing downstream of a confluence is a slow process, typically completed at distances greater than 100 times the channel width. Bed morphology is now emerging as a critical factor: flume experiments have shown that the width to depth ratios
12
and height discordance
13,14
between the confluent channels should influence mixing rates
12–14
. But the magnitude of these effects in real rivers is not known. Here we report measure-ments from three river confluences of moderate size which show that bed discordance can markedly increase mixing rates. For the rivers studied, mixing is complete at distances five to ten times shorter than those reported previously. |
| doi_str_mv | 10.1038/373138a0 |
| format | article |
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1–11
have indicated that flow mixing downstream of a confluence is a slow process, typically completed at distances greater than 100 times the channel width. Bed morphology is now emerging as a critical factor: flume experiments have shown that the width to depth ratios
12
and height discordance
13,14
between the confluent channels should influence mixing rates
12–14
. But the magnitude of these effects in real rivers is not known. Here we report measure-ments from three river confluences of moderate size which show that bed discordance can markedly increase mixing rates. For the rivers studied, mixing is complete at distances five to ten times shorter than those reported previously.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/373138a0</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Freshwater ; Humanities and Social Sciences ; Hydrology ; Hydrology. Hydrogeology ; letter ; multidisciplinary ; Rivers ; Science ; Science (multidisciplinary) ; Weights & measures</subject><ispartof>Nature (London), 1995-01, Vol.373 (6510), p.138-139</ispartof><rights>Springer Nature Limited 1995</rights><rights>1995 INIST-CNRS</rights><rights>Copyright Macmillan Journals Ltd. Jan 12, 1995</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a517t-175a1839f74e9349e149243a2f72616b87202a6495f2e942d32351fddea4eb043</citedby><cites>FETCH-LOGICAL-a517t-175a1839f74e9349e149243a2f72616b87202a6495f2e942d32351fddea4eb043</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,2727,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=3422970$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Gaudet, Jocelyn M</creatorcontrib><creatorcontrib>Roy, André G</creatorcontrib><title>Effect of bed morphology on flow mixing length at river confluences</title><title>Nature (London)</title><addtitle>Nature</addtitle><description>MIXING processes at river confluences have an important bearing on problems such as pollutant dispersal and the management of river systems, but remain poorly understood. Previous studies
1–11
have indicated that flow mixing downstream of a confluence is a slow process, typically completed at distances greater than 100 times the channel width. Bed morphology is now emerging as a critical factor: flume experiments have shown that the width to depth ratios
12
and height discordance
13,14
between the confluent channels should influence mixing rates
12–14
. But the magnitude of these effects in real rivers is not known. Here we report measure-ments from three river confluences of moderate size which show that bed discordance can markedly increase mixing rates. For the rivers studied, mixing is complete at distances five to ten times shorter than those reported previously.</description><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Freshwater</subject><subject>Humanities and Social Sciences</subject><subject>Hydrology</subject><subject>Hydrology. 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Previous studies
1–11
have indicated that flow mixing downstream of a confluence is a slow process, typically completed at distances greater than 100 times the channel width. Bed morphology is now emerging as a critical factor: flume experiments have shown that the width to depth ratios
12
and height discordance
13,14
between the confluent channels should influence mixing rates
12–14
. But the magnitude of these effects in real rivers is not known. Here we report measure-ments from three river confluences of moderate size which show that bed discordance can markedly increase mixing rates. For the rivers studied, mixing is complete at distances five to ten times shorter than those reported previously.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/373138a0</doi><tpages>2</tpages></addata></record> |
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| identifier | ISSN: 0028-0836 |
| ispartof | Nature (London), 1995-01, Vol.373 (6510), p.138-139 |
| issn | 0028-0836 1476-4687 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_743190608 |
| source | Nature |
| subjects | Earth sciences Earth, ocean, space Exact sciences and technology Freshwater Humanities and Social Sciences Hydrology Hydrology. Hydrogeology letter multidisciplinary Rivers Science Science (multidisciplinary) Weights & measures |
| title | Effect of bed morphology on flow mixing length at river confluences |
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