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Article: Simulation of harmful algal blooms using a deterministic Lagrangian particle separation-based method

TitleSimulation of harmful algal blooms using a deterministic Lagrangian particle separation-based method
Authors
KeywordsAdvective-diffusion
Dinoflagellates
Dissolved oxygen
Ecological model
Harmful algal blooms
Lagrangian particle model
Particle separation
Relative diffusion
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711617/description#description
Citation
Journal Of Hydro-Environment Research, 2007, v. 1 n. 1, p. 43-55 How to Cite?
AbstractAlgal blooms (red tide) are often observed in Hong Kong's coastal waters. These algal blooms can cause discoloration of the marine water, and may result in severe dissolved oxygen depletion and fish kills; most harmful algal blooms (HAB) are caused by diatoms and dinoflagellates. Diatoms are non-motile algae relying on water turbulence for suspension and nutrient supply. Dinoflagellates, on the other hand, can undergo diel vertical migration. At night, the algal cells swim down the water column to uptake nutrient and store it as internal nutrient reserve (cell quota). During daytime, they ascend to the water surface to carry out photosynthesis using the nutrient reserve. Diel vertical migration is an important adaptive strategy of dinoflagellates to form blooms in stratified waters. In this paper, the vertical migration behaviour of dinoflagellates is modelled using a simple deterministic Lagrangian model based on a NEighbourhood Separation Technique (NEST). The method is based on relative diffusion concepts, and simulates the diffusion process via an equivalent macroscopic motion; it uses far less number of particles than that required in random walk methods. The Lagrangian cell quota based algal dynamics is incorporated in a one-dimensional model to predict the vertical structure of water quality. Dinoflagellates are represented by a number of particles, with algal growth dependent on its nutrient reserve and the available light intensity. Swimming behaviour is simulated by the corresponding advective translocation of the particle. The model is applied to study species competition, resulting in a simple bloom prediction criterion based on nutrient availability and vertical diffusivity. In addition, the changes in water quality during an observed dinoflagellate bloom in Hong Kong coastal waters are well supported by field data; the role of stratification and diel vertical migration on the bloom formation and the signature of dissolved oxygen are discussed. © 2007 International Association for Hydraulic Engineering and Research, Asia Pacific Division.
Persistent Identifierhttp://hdl.handle.net/10722/70953
ISSN
2015 Impact Factor: 1.971
2015 SCImago Journal Rankings: 0.641
ISI Accession Number ID
Funding AgencyGrant Number
University Grants Committee, HKSAR, ChinaAoE/P-04/04
Hong Kong Research Grants CouncilHKU 7110/04E
Funding Information:

This work is supported by a grant from the University Grants Committee, HKSAR, China (Project No. AoE/P-04/04), and in part by the Hong Kong Research Grants Council (Project No. HKU 7110/04E).

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWong, KTMen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2010-09-06T06:27:35Z-
dc.date.available2010-09-06T06:27:35Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal Of Hydro-Environment Research, 2007, v. 1 n. 1, p. 43-55en_HK
dc.identifier.issn1570-6443en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70953-
dc.description.abstractAlgal blooms (red tide) are often observed in Hong Kong's coastal waters. These algal blooms can cause discoloration of the marine water, and may result in severe dissolved oxygen depletion and fish kills; most harmful algal blooms (HAB) are caused by diatoms and dinoflagellates. Diatoms are non-motile algae relying on water turbulence for suspension and nutrient supply. Dinoflagellates, on the other hand, can undergo diel vertical migration. At night, the algal cells swim down the water column to uptake nutrient and store it as internal nutrient reserve (cell quota). During daytime, they ascend to the water surface to carry out photosynthesis using the nutrient reserve. Diel vertical migration is an important adaptive strategy of dinoflagellates to form blooms in stratified waters. In this paper, the vertical migration behaviour of dinoflagellates is modelled using a simple deterministic Lagrangian model based on a NEighbourhood Separation Technique (NEST). The method is based on relative diffusion concepts, and simulates the diffusion process via an equivalent macroscopic motion; it uses far less number of particles than that required in random walk methods. The Lagrangian cell quota based algal dynamics is incorporated in a one-dimensional model to predict the vertical structure of water quality. Dinoflagellates are represented by a number of particles, with algal growth dependent on its nutrient reserve and the available light intensity. Swimming behaviour is simulated by the corresponding advective translocation of the particle. The model is applied to study species competition, resulting in a simple bloom prediction criterion based on nutrient availability and vertical diffusivity. In addition, the changes in water quality during an observed dinoflagellate bloom in Hong Kong coastal waters are well supported by field data; the role of stratification and diel vertical migration on the bloom formation and the signature of dissolved oxygen are discussed. © 2007 International Association for Hydraulic Engineering and Research, Asia Pacific Division.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711617/description#descriptionen_HK
dc.relation.ispartofJournal of Hydro-Environment Researchen_HK
dc.rightsJournal of Hydro-Environment Research. Copyright © Elsevier BV.en_HK
dc.subjectAdvective-diffusionen_HK
dc.subjectDinoflagellatesen_HK
dc.subjectDissolved oxygenen_HK
dc.subjectEcological modelen_HK
dc.subjectHarmful algal bloomsen_HK
dc.subjectLagrangian particle modelen_HK
dc.subjectParticle separationen_HK
dc.subjectRelative diffusionen_HK
dc.titleSimulation of harmful algal blooms using a deterministic Lagrangian particle separation-based methoden_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1570-6443&volume=1&issue=1&spage=43&epage=55&date=2007&atitle=Simulation+of+harmful+algal+blooms+using+a+deterministic+Lagrangian+particle+separation-based+methoden_HK
dc.identifier.emailWong, KTM: ken0wong@hku.hken_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityWong, KTM=rp00073en_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jher.2007.04.003en_HK
dc.identifier.scopuseid_2-s2.0-44049088377en_HK
dc.identifier.hkuros162887en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-44049088377&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume1en_HK
dc.identifier.issue1en_HK
dc.identifier.spage43en_HK
dc.identifier.epage55en_HK
dc.identifier.isiWOS:000207649400006-
dc.publisher.placeNetherlandsen_HK
dc.relation.projectData assimilation for forecasting of coastal water quality-
dc.identifier.scopusauthoridWong, KTM=24315177100en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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