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dc.contributor.authorLisle, IG
dc.contributor.authorSander, GC
dc.contributor.authorParlange, J-Y
dc.contributor.authorRose, CW
dc.contributor.authorHogarth, WL
dc.contributor.authorBraddock, RD
dc.contributor.authorStagnitti, F
dc.contributor.authorLockington, DA
dc.contributor.authorJomaa, S
dc.contributor.authorCheraghi, M
dc.contributor.authorBarry, DA
dc.date.accessioned2018-04-23T04:48:06Z
dc.date.available2018-04-23T04:48:06Z
dc.date.issued2017
dc.identifier.issn1539-1663
dc.identifier.doi10.2136/vzj2017.06.0121
dc.identifier.urihttp://hdl.handle.net/10072/373646
dc.description.abstractUnlike sediment transport in rivers, erosion of agricultural soil must overcome its cohesive strength to move soil particles into suspension. Soil particle size variability also leads to fall velocities covering many orders of magnitude, and hence to different suspended travel distances in overland flow. Consequently, there is a large range of inherent timescales involved in transport of eroded soil. For conditions where there is a constant rainfall rate and detachment is the dominant erosion mechanism, we use the Hairsine–Rose (HR) model to analyze these timescales, to determine their magnitude (bounds) and to provide simple approximations for them. We show that each particle size produces both fast and slow timescales. The fast timescale controls the rapid adjustment away from experimental initial conditions—this happens so quickly that it cannot be measured in practice. The slow timescales control the subsequent transition to steady state and are so large that true steady state is rarely achieved in laboratory experiments. Both the fastest and slowest timescales are governed by the largest particle size class. Physically, these correspond to the rate of vertical movement between suspension and the soil bed and the time to achieve steady state, respectively. For typical distributions of size classes, we also find that there is often a single dominant timescale that governs the growth in the total mass of sediment in the non-cohesive deposited layer. This finding allows a considerable simplification of the HR model, leading to analytical expressions for the evolution of suspended and deposited layer concentrations.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherSoil Science Society of America
dc.relation.ispartofpagefrom1
dc.relation.ispartofpageto13
dc.relation.ispartofissue12
dc.relation.ispartofjournalVadose Zone Journal
dc.relation.ispartofvolume16
dc.subject.fieldofresearchSoil Sciences not elsewhere classified
dc.subject.fieldofresearchPhysical Geography and Environmental Geoscience
dc.subject.fieldofresearchSoil Sciences
dc.subject.fieldofresearchCrop and Pasture Production
dc.subject.fieldofresearchcode050399
dc.subject.fieldofresearchcode0406
dc.subject.fieldofresearchcode0503
dc.subject.fieldofresearchcode0703
dc.titleTransport Time Scales in Soil Erosion Modeling
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionPublished
gro.rights.copyright© The Author(s) 2017. This is the author-manuscript version of this paper. It is posted here with permission of the copyright owner(s) for your personal use only. No further distribution permitted. For information about this journal please refer to the journal’s website or contact the author(s).
gro.hasfulltextFull Text
gro.griffith.authorRose, Calvin W.
gro.griffith.authorBraddock, Roger D.
gro.griffith.authorSander, Graham C.


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