A simple model for forecast of coastal algal blooms
In 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-i...
Published in: | Estuarine, Coastal and Shelf Science |
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Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Academic Press. The Journal's web site is located at http://www.elsevier.com/locate/ecss
2007
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Online Access: | https://doi.org/10.1016/j.ecss.2007.04.012 http://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+blooms http://hdl.handle.net/10722/70832 |
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ftunivhongkonghu:oai:hub.hku.hk:10722/70832 2023-05-15T17:36:13+02:00 A simple model for forecast of coastal algal blooms Lee, JHW Wong, KTM Hodgkiss, IJ 2007 https://doi.org/10.1016/j.ecss.2007.04.012 http://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+blooms http://hdl.handle.net/10722/70832 eng eng Academic Press. The Journal's web site is located at http://www.elsevier.com/locate/ecss United Kingdom Estuarine, Coastal and Shelf Science http://www.scopus.com/mlt/select.url?eid=2-s2.0-34250731285&selection=ref&src=s&origin=recordpage Estuarine, Coastal And Shelf Science, 2007, v. 74 n. 1-2, p. 175-196 doi:10.1016/j.ecss.2007.04.012 196 134118 WOS:000247907900017 0272-7714 1-2 http://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+blooms eid_2-s2.0-34250731285 175 http://hdl.handle.net/10722/70832 74 algal blooms ecology hydrodynamics red tide forecasting model water quality modelling red tides Article 2007 ftunivhongkonghu https://doi.org/10.1016/j.ecss.2007.04.012 2023-01-14T15:14:11Z In 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 ... Article in Journal/Newspaper North Atlantic University of Hong Kong: HKU Scholars Hub Bingham ENVELOPE(-63.400,-63.400,-69.400,-69.400) Riley ENVELOPE(-147.617,-147.617,-86.183,-86.183) Estuarine, Coastal and Shelf Science 74 1-2 175 196 |
institution |
Open Polar |
collection |
University of Hong Kong: HKU Scholars Hub |
op_collection_id |
ftunivhongkonghu |
language |
English |
topic |
algal blooms ecology hydrodynamics red tide forecasting model water quality modelling red tides |
spellingShingle |
algal blooms ecology hydrodynamics red tide forecasting model water quality modelling red tides Lee, JHW Wong, KTM Hodgkiss, IJ A simple model for forecast of coastal algal blooms |
topic_facet |
algal blooms ecology hydrodynamics red tide forecasting model water quality modelling red tides |
description |
In 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 ... |
format |
Article in Journal/Newspaper |
author |
Lee, JHW Wong, KTM Hodgkiss, IJ |
author_facet |
Lee, JHW Wong, KTM Hodgkiss, IJ |
author_sort |
Lee, JHW |
title |
A simple model for forecast of coastal algal blooms |
title_short |
A simple model for forecast of coastal algal blooms |
title_full |
A simple model for forecast of coastal algal blooms |
title_fullStr |
A simple model for forecast of coastal algal blooms |
title_full_unstemmed |
A simple model for forecast of coastal algal blooms |
title_sort |
simple model for forecast of coastal algal blooms |
publisher |
Academic Press. The Journal's web site is located at http://www.elsevier.com/locate/ecss |
publishDate |
2007 |
url |
https://doi.org/10.1016/j.ecss.2007.04.012 http://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+blooms http://hdl.handle.net/10722/70832 |
long_lat |
ENVELOPE(-63.400,-63.400,-69.400,-69.400) ENVELOPE(-147.617,-147.617,-86.183,-86.183) |
geographic |
Bingham Riley |
geographic_facet |
Bingham Riley |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Estuarine, Coastal and Shelf Science http://www.scopus.com/mlt/select.url?eid=2-s2.0-34250731285&selection=ref&src=s&origin=recordpage Estuarine, Coastal And Shelf Science, 2007, v. 74 n. 1-2, p. 175-196 doi:10.1016/j.ecss.2007.04.012 196 134118 WOS:000247907900017 0272-7714 1-2 http://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+blooms eid_2-s2.0-34250731285 175 http://hdl.handle.net/10722/70832 74 |
op_doi |
https://doi.org/10.1016/j.ecss.2007.04.012 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
74 |
container_issue |
1-2 |
container_start_page |
175 |
op_container_end_page |
196 |
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1766135622597083136 |