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Article: Modelling particle size distribution dynamics in marine waters

TitleModelling particle size distribution dynamics in marine waters
Authors
KeywordsCoagulation
Flocculation
Fractal
Marine water
Particle
Particle size distribution (PSD)
Phytoplankton bloom
Issue Date2004
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2004, v. 38 n. 5, p. 1305-1317 How to Cite?
AbstractNumerical simulations were carried out to determine the particle size distribution (PSD) in marine waters by accounting for particle influx, coagulation, sedimentation and breakage. Instead of the conventional rectilinear model and Euclidean geometry, a curvilinear collision model and fractal scaling mathematics were used in the models. A steady-state PSD can be achieved after a period of simulation regardless of the initial conditions. The cumulative PSD in the steady state follows a power-law function, which has three linear regions after log-log transformation, with different slopes corresponding to the three collision mechanisms, Brownian motion, fluid shear and differential sedimentation. The PSD slope varies from -3.5 to -1.2 as a function of the size range and the fractal dimension of the particles concerned. The environmental conditions do not significantly alter the PSD slope, although they may change the position of the PSD and related particle concentrations. The simulation demonstrates a generality in the shape of the steady-state PSD in the ocean, which is in agreement with many field observations. Breakage does not affect the size distribution of small particles, while a strong shear may cause a notable change in the PSD for larger and fractal particles only. The simplified approach of previous works using dimensional analysis still offers valuable approximations for the PSD slopes, although the previous solutions do not always agree with the simulation results. The variation in the PSD slope observed in field investigations can be reproduced numerically. It is argued that non-steady-state conditions in natural waters could be the main reason for the deviation of PSD slopes. A change in the nature of the particles, such as stickiness, and environmental variables, such as particle input and shear intensity, could force the PSD to shift from one steady state to another. During such a transition, the PSD slope may vary to some extent with the particle population dynamics. © 2003 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/71265
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XYen_HK
dc.contributor.authorZhang, JJen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2010-09-06T06:30:25Z-
dc.date.available2010-09-06T06:30:25Z-
dc.date.issued2004en_HK
dc.identifier.citationWater Research, 2004, v. 38 n. 5, p. 1305-1317en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71265-
dc.description.abstractNumerical simulations were carried out to determine the particle size distribution (PSD) in marine waters by accounting for particle influx, coagulation, sedimentation and breakage. Instead of the conventional rectilinear model and Euclidean geometry, a curvilinear collision model and fractal scaling mathematics were used in the models. A steady-state PSD can be achieved after a period of simulation regardless of the initial conditions. The cumulative PSD in the steady state follows a power-law function, which has three linear regions after log-log transformation, with different slopes corresponding to the three collision mechanisms, Brownian motion, fluid shear and differential sedimentation. The PSD slope varies from -3.5 to -1.2 as a function of the size range and the fractal dimension of the particles concerned. The environmental conditions do not significantly alter the PSD slope, although they may change the position of the PSD and related particle concentrations. The simulation demonstrates a generality in the shape of the steady-state PSD in the ocean, which is in agreement with many field observations. Breakage does not affect the size distribution of small particles, while a strong shear may cause a notable change in the PSD for larger and fractal particles only. The simplified approach of previous works using dimensional analysis still offers valuable approximations for the PSD slopes, although the previous solutions do not always agree with the simulation results. The variation in the PSD slope observed in field investigations can be reproduced numerically. It is argued that non-steady-state conditions in natural waters could be the main reason for the deviation of PSD slopes. A change in the nature of the particles, such as stickiness, and environmental variables, such as particle input and shear intensity, could force the PSD to shift from one steady state to another. During such a transition, the PSD slope may vary to some extent with the particle population dynamics. © 2003 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectCoagulationen_HK
dc.subjectFlocculationen_HK
dc.subjectFractalen_HK
dc.subjectMarine wateren_HK
dc.subjectParticleen_HK
dc.subjectParticle size distribution (PSD)en_HK
dc.subjectPhytoplankton bloomen_HK
dc.subject.meshGeologic Sediments - chemistryen_HK
dc.subject.meshModels, Theoreticalen_HK
dc.subject.meshParticle Sizeen_HK
dc.subject.meshPhytoplankton - growth & developmenten_HK
dc.subject.meshPopulation Dynamicsen_HK
dc.subject.meshSeawater - chemistryen_HK
dc.subject.meshWater Movementsen_HK
dc.titleModelling particle size distribution dynamics in marine watersen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=38&spage=1305&epage=1317&date=2004&atitle=Modelling+particle+size+distribution+dynamics+in+marine+watersen_HK
dc.identifier.emailLi, XY: xlia@hkucc.hku.hken_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.watres.2003.11.010en_HK
dc.identifier.pmid14975664-
dc.identifier.scopuseid_2-s2.0-1242340462en_HK
dc.identifier.hkuros90837en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1242340462&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue5en_HK
dc.identifier.spage1305en_HK
dc.identifier.epage1317en_HK
dc.identifier.isiWOS:000220012900025-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridZhang, JJ=7601341506en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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