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Article: Tidal flushing time of marine fish culture zones in Hong Kong

TitleTidal flushing time of marine fish culture zones in Hong Kong
Authors
Keywordscarrying capacity
fish culture zone
flushing time
hydrodynamic tracking
physical self-purification
tidal exchange
Issue Date2011
PublisherHaiyang Chubanshe.
Citation
China Ocean Engineering, 2011, v. 25 n. 4, p. 625-643 How to Cite?
AbstractAccurate determination of flushing time is crucial for maintaining sustainable production in fish culture zones (FCZs), as it represents the physical self-purification capability via tidal exchange with clean water in the outer sea. However, owing to the temporal and spatial complexity of the coastal flushing process, existing methods for determining flushing time may not be generally applicable. In this paper, a systematic method for determining the flushing time in FCZs is presented, in which bathymetry, runoff, tidal range and stratification are properly accounted for. We determine the flushing time via numerical tracer experiments, using robust 3D hydrodynamic and mass transport models. For FCZs located in sheltered and land-locked tidal inlets, the system boundary can be naturally defined at the connection with the open sea. For FCZs located in open waters, hydrodynamic tracking is first used to assess the extent of tidal excursion and thus delimit the initial boundary between clean water and polluted water. This general method is applied to all designated marine FCZs in Hong Kong for both the dry and wet seasons, including 20 sheltered FCZs (in semi-enclosed waters of Tolo Harbour, Mirs Bay, and Port Shelter) and 6 FCZs in open waters. Our results show that flushing time is the longest in inner Port Shelter (about 40 days in dry season), and the shortest for the FCZs in open waters (less than one week in dry season). In addition, the flushing time in dry season is commonly longer than that in wet season: 20%~40% for most well-sheltered FCZs; 2.6~4 times for the others. Our results indicate a positive correlation between the flushing time and distance to open boundary, supporting the view that the flushing time of a FCZ is closely related to its location. This study provides a solid basis for mariculture management such as the determination of carrying capacity of FCZs. © 2011 Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg.
Persistent Identifierhttp://hdl.handle.net/10722/145884
ISSN
2015 Impact Factor: 0.435
2015 SCImago Journal Rankings: 0.422
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Jockey Club Charities Trust
University Grants Committee of the Hong Kong Special Administrative Region (HKSAR), ChinaAoE/P-04/04
National Science Fund for Distinguished Young Scholars50925932
National Natural Science Foundation of China41001348
Funding Information:

This work was supported by the Hong Kong Jockey Club Charities Trust (Project Waterman), and in part by a grant from the University Grants Committee of the Hong Kong Special Administrative Region (HKSAR), China (Project No. AoE/P-04/04) to the Area of Excellence in Marine Environment Research and Innovative Technology (MERIT). The support from the National Science Fund for Distinguished Young Scholars (Grant No. 50925932) and the National Natural Science Foundation of China (Grant No. 41001348) is also gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorMao, Jqen_HK
dc.contributor.authorWong, KTMen_HK
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorChoi, KWen_HK
dc.date.accessioned2012-03-27T08:58:18Z-
dc.date.available2012-03-27T08:58:18Z-
dc.date.issued2011en_HK
dc.identifier.citationChina Ocean Engineering, 2011, v. 25 n. 4, p. 625-643en_HK
dc.identifier.issn0890-5487en_HK
dc.identifier.urihttp://hdl.handle.net/10722/145884-
dc.description.abstractAccurate determination of flushing time is crucial for maintaining sustainable production in fish culture zones (FCZs), as it represents the physical self-purification capability via tidal exchange with clean water in the outer sea. However, owing to the temporal and spatial complexity of the coastal flushing process, existing methods for determining flushing time may not be generally applicable. In this paper, a systematic method for determining the flushing time in FCZs is presented, in which bathymetry, runoff, tidal range and stratification are properly accounted for. We determine the flushing time via numerical tracer experiments, using robust 3D hydrodynamic and mass transport models. For FCZs located in sheltered and land-locked tidal inlets, the system boundary can be naturally defined at the connection with the open sea. For FCZs located in open waters, hydrodynamic tracking is first used to assess the extent of tidal excursion and thus delimit the initial boundary between clean water and polluted water. This general method is applied to all designated marine FCZs in Hong Kong for both the dry and wet seasons, including 20 sheltered FCZs (in semi-enclosed waters of Tolo Harbour, Mirs Bay, and Port Shelter) and 6 FCZs in open waters. Our results show that flushing time is the longest in inner Port Shelter (about 40 days in dry season), and the shortest for the FCZs in open waters (less than one week in dry season). In addition, the flushing time in dry season is commonly longer than that in wet season: 20%~40% for most well-sheltered FCZs; 2.6~4 times for the others. Our results indicate a positive correlation between the flushing time and distance to open boundary, supporting the view that the flushing time of a FCZ is closely related to its location. This study provides a solid basis for mariculture management such as the determination of carrying capacity of FCZs. © 2011 Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg.en_HK
dc.languageengen_US
dc.publisherHaiyang Chubanshe.en_US
dc.relation.ispartofChina Ocean Engineeringen_HK
dc.subjectcarrying capacityen_HK
dc.subjectfish culture zoneen_HK
dc.subjectflushing timeen_HK
dc.subjecthydrodynamic trackingen_HK
dc.subjectphysical self-purificationen_HK
dc.subjecttidal exchangeen_HK
dc.titleTidal flushing time of marine fish culture zones in Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0890-5487&volume=25&spage=625&epage=643&date=2011&atitle=Tidal+Flushing+Time+of+Marine+Fish+Culture+Zones+in+Hong+Kongen_US
dc.identifier.emailWong, KTM: ken0wong@hku.hken_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.emailChoi, KW: choidkw@hkucc.hku.hken_HK
dc.identifier.authorityWong, KTM=rp00073en_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.identifier.authorityChoi, KW=rp00107en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s13344-011-0050-5en_HK
dc.identifier.scopuseid_2-s2.0-83455195980en_HK
dc.identifier.hkuros199041en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-83455195980&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume25en_HK
dc.identifier.issue4en_HK
dc.identifier.spage625en_HK
dc.identifier.epage643en_HK
dc.identifier.isiWOS:000298195200006-
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridMao, Jq=15042639700en_HK
dc.identifier.scopusauthoridWong, KTM=24315177100en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridChoi, KW=25627214800en_HK

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