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Article: A simple model for forecast of coastal algal blooms

TitleA simple model for forecast of coastal algal blooms
Authors
Keywordsalgal blooms
ecology
hydrodynamics
red tide forecasting model
red tides
water quality modelling
Issue Date2007
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ecss
Citation
Estuarine, Coastal And Shelf Science, 2007, v. 74 n. 1-2, p. 175-196 How to Cite?
AbstractIn eutrophic sub-tropical coastal waters around Hong Kong and South China, algal blooms (more often called red tides) due to the rapid growth of microscopic phytoplankton are often observed. Under favourable environmental conditions, these blooms can occur and subside over rather short time scales-in the order of days to a few weeks. Very often, these blooms are observed in weakly flushed coastal waters under calm wind conditions-with or without stratification. Based on high-frequency field observations of harmful algal blooms at two coastal mariculture zones in Hong Kong, a mathematical model has been developed to forecast algal blooms. The model accounts for algal growth, decay, settling and vertical turbulent mixing, and adopts the same assumptions as the classical Riley, Stommel and Bumpus model (Riley, G.A., Stommel, H., Bumpus, D.F., 1949. Quantitative ecology of the plankton of the western North Atlantic. Bulletin of the Bingham Oceanographic Collection Yale University 12, 1-169). It is shown that for algal blooms to occur, a vertical stability criterion, E < 4μl2/π2, must be satisfied, where E, μ, l are the vertical turbulent diffusivity, algal growth rate, and euphotic layer depth respectively. In addition, a minimum nutrient threshold concentration must be reached. Moreover, with a nutrient competition consideration, the type of bloom (caused by motile or non-motile species) can be classified. The model requires as input simple and readily available field measurements of water column transparency and nutrient concentration, and representative maximum algal growth rate of the motile and non-motile species. In addition, with the use of three-dimensional hydrodynamic circulation models, simple relations are derived to estimate the vertical mixing coefficient as a function of tidal range, wind speed, and density stratification. The model gives a quick assessment of the likelihood of algal bloom occurrence, and has been validated against field observations over a 4-year period. The model helps to explain the observed spatial and temporal patterns of bloom occurrences in relation to the vertical turbulence and nutrient condition. The success of the model points the way to the development of real time management models for disaster mitigation. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/70832
ISSN
2015 Impact Factor: 2.335
2015 SCImago Journal Rankings: 1.094
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWong, KTMen_HK
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorHodgkiss, IJen_HK
dc.date.accessioned2010-09-06T06:26:31Z-
dc.date.available2010-09-06T06:26:31Z-
dc.date.issued2007en_HK
dc.identifier.citationEstuarine, Coastal And Shelf Science, 2007, v. 74 n. 1-2, p. 175-196en_HK
dc.identifier.issn0272-7714en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70832-
dc.description.abstractIn eutrophic sub-tropical coastal waters around Hong Kong and South China, algal blooms (more often called red tides) due to the rapid growth of microscopic phytoplankton are often observed. Under favourable environmental conditions, these blooms can occur and subside over rather short time scales-in the order of days to a few weeks. Very often, these blooms are observed in weakly flushed coastal waters under calm wind conditions-with or without stratification. Based on high-frequency field observations of harmful algal blooms at two coastal mariculture zones in Hong Kong, a mathematical model has been developed to forecast algal blooms. The model accounts for algal growth, decay, settling and vertical turbulent mixing, and adopts the same assumptions as the classical Riley, Stommel and Bumpus model (Riley, G.A., Stommel, H., Bumpus, D.F., 1949. Quantitative ecology of the plankton of the western North Atlantic. Bulletin of the Bingham Oceanographic Collection Yale University 12, 1-169). It is shown that for algal blooms to occur, a vertical stability criterion, E < 4μl2/π2, must be satisfied, where E, μ, l are the vertical turbulent diffusivity, algal growth rate, and euphotic layer depth respectively. In addition, a minimum nutrient threshold concentration must be reached. Moreover, with a nutrient competition consideration, the type of bloom (caused by motile or non-motile species) can be classified. The model requires as input simple and readily available field measurements of water column transparency and nutrient concentration, and representative maximum algal growth rate of the motile and non-motile species. In addition, with the use of three-dimensional hydrodynamic circulation models, simple relations are derived to estimate the vertical mixing coefficient as a function of tidal range, wind speed, and density stratification. The model gives a quick assessment of the likelihood of algal bloom occurrence, and has been validated against field observations over a 4-year period. The model helps to explain the observed spatial and temporal patterns of bloom occurrences in relation to the vertical turbulence and nutrient condition. The success of the model points the way to the development of real time management models for disaster mitigation. © 2007 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ecssen_HK
dc.relation.ispartofEstuarine, Coastal and Shelf Scienceen_HK
dc.subjectalgal bloomsen_HK
dc.subjectecologyen_HK
dc.subjecthydrodynamicsen_HK
dc.subjectred tide forecasting modelen_HK
dc.subjectred tidesen_HK
dc.subjectwater quality modellingen_HK
dc.titleA simple model for forecast of coastal algal bloomsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0272-7714&volume=74&spage=175&epage=196&date=2007&atitle=A+simple+model+for+forecast+of+coastal+algal+bloomsen_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.ecss.2007.04.012en_HK
dc.identifier.scopuseid_2-s2.0-34250731285en_HK
dc.identifier.hkuros134118en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34250731285&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume74en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage175en_HK
dc.identifier.epage196en_HK
dc.identifier.isiWOS:000247907900017-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridWong, KTM=24315177100en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridHodgkiss, IJ=7006614647en_HK

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