Cohesive/cohesionless sediment transition diameter from settling velocity data.
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| Title: | Cohesive/cohesionless sediment transition diameter from settling velocity data. |
|---|---|
| Authors: | Mehta, Ashish1 mehtanutechinc@gmail.com, Letter, Joseph2 |
| Source: | Ocean Dynamics. Sep2015, Vol. 65 Issue 9/10, p1213-1219. 7p. |
| Subjects: | Mathematical models of oceanography, Sediment transport, Flocculation, Velocity distribution (Statistical mechanics), Electrochemical analysis, Shearing force |
| Abstract: | Mathematical models designed to simulate the movement of cohesive and cohesionless particles require as input the diameter d specifying the transition between these two transport modes. As an effort to identify this diameter, Migniot (La Houille Blanche, 7, 591-620, 1968) measured in a water-filled column the settling velocities of flocs and respective deflocculated particles of mainly mineral cohesive sediments. The data were plotted as the ratio of the floc settling velocity to the particle velocity, called the flocculation factor F, against particle diameter d. The trend line was found to approximately follow an empirical power-law such that F increased rapidly as d decreased below d estimated to be about 30 μm at F = 1. Assuming fractal self-similarity among falling flocs, the power-law exponent of 5/3 is shown to correspond to a fractal dimension of 2.65 implying that the flocs were densely packed. The diameter d depends on the electrochemical properties of the suspended particles as well as the kinetics of floc growth and breakup, hence to an extent on the method of determination of d. Its value deduced more directly from measurement of the critical shear stress for erosion of flocs at the surface of cohesive sediment beds has been reported to be about 10 μm, which is lower than 30 μm. Among other reasons, it is likely that the difference is rooted in the limited experimental information available as well as difficulty in characterizing the effect of highly graded distributions of the particle settling velocity. [ABSTRACT FROM AUTHOR] |
| Copyright of Ocean Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Cohesive/cohesionless sediment transition diameter from settling velocity data. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mehta%2C+Ashish%22">Mehta, Ashish</searchLink><relatesTo>1</relatesTo><i> mehtanutechinc@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Letter%2C+Joseph%22">Letter, Joseph</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ocean+Dynamics%22">Ocean Dynamics</searchLink>. Sep2015, Vol. 65 Issue 9/10, p1213-1219. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Mathematical+models+of+oceanography%22">Mathematical models of oceanography</searchLink><br /><searchLink fieldCode="DE" term="%22Sediment+transport%22">Sediment transport</searchLink><br /><searchLink fieldCode="DE" term="%22Flocculation%22">Flocculation</searchLink><br /><searchLink fieldCode="DE" term="%22Velocity+distribution+%28Statistical+mechanics%29%22">Velocity distribution (Statistical mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+analysis%22">Electrochemical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Shearing+force%22">Shearing force</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Mathematical models designed to simulate the movement of cohesive and cohesionless particles require as input the diameter d specifying the transition between these two transport modes. As an effort to identify this diameter, Migniot (La Houille Blanche, 7, 591-620, 1968) measured in a water-filled column the settling velocities of flocs and respective deflocculated particles of mainly mineral cohesive sediments. The data were plotted as the ratio of the floc settling velocity to the particle velocity, called the flocculation factor F, against particle diameter d. The trend line was found to approximately follow an empirical power-law such that F increased rapidly as d decreased below d estimated to be about 30 μm at F = 1. Assuming fractal self-similarity among falling flocs, the power-law exponent of 5/3 is shown to correspond to a fractal dimension of 2.65 implying that the flocs were densely packed. The diameter d depends on the electrochemical properties of the suspended particles as well as the kinetics of floc growth and breakup, hence to an extent on the method of determination of d. Its value deduced more directly from measurement of the critical shear stress for erosion of flocs at the surface of cohesive sediment beds has been reported to be about 10 μm, which is lower than 30 μm. Among other reasons, it is likely that the difference is rooted in the limited experimental information available as well as difficulty in characterizing the effect of highly graded distributions of the particle settling velocity. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ocean Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10236-015-0865-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 1213 Subjects: – SubjectFull: Mathematical models of oceanography Type: general – SubjectFull: Sediment transport Type: general – SubjectFull: Flocculation Type: general – SubjectFull: Velocity distribution (Statistical mechanics) Type: general – SubjectFull: Electrochemical analysis Type: general – SubjectFull: Shearing force Type: general Titles: – TitleFull: Cohesive/cohesionless sediment transition diameter from settling velocity data. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mehta, Ashish – PersonEntity: Name: NameFull: Letter, Joseph IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 16167341 Numbering: – Type: volume Value: 65 – Type: issue Value: 9/10 Titles: – TitleFull: Ocean Dynamics Type: main |
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