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Conference Paper: Tide-induced air pressure fluctuation in coastal unsaturated zones
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TitleTide-induced air pressure fluctuation in coastal unsaturated zones
 
AuthorsJiao, JJ2
Li, H1
 
KeywordsAir Pressure Fluctuation
Air-Water Two-Phase Flow
Coastal Aquifer System
Sea Tide
Tough2
 
Issue Date2003
 
CitationProceedings Of The 2003 International Symposium On Water Resources And The Urban Environment, 2003, p. 10-13 [How to Cite?]
 
AbstractAir pressure in coastal unsaturated aquifers fluctuates with sea tides, as does the groundwater level. Tide-induced air pressure fluctuations in coastal subsurface systems, however, are not well addressed in literature. Significant diurnal air pressure fluctuations are observed below the asphalt pavement in a coastal reclamation area of Hong Kong. A two-dimensional cross-sectional model is built to describe the air-water two-phase flow in the unsaturated zone of the area. TOUGH2, a general-purpose numerical simulation program for multi-dimensional fluid and heat flows of multiphase, multicomponent fluid mixtures in porous and fracture media, is used to obtain the numerical solutions. The numerical simulation reveals that the significant air pressure fluctuation results from a combination of various factors such as asphalt pavement of extremely low permeability, soil structures of the reclamation area, and rainfall intensity during spring tides. Numerical simulation also reveals that the air pressure is approximately proportional to the tidal rate. A great amplitude of the sea level fluctuation will not necessarily lead to high air pressure, if the sea level changes slowly. Coastal unsaturated zones inhale and exhale as the tidal level falls and rises. The paper goes on to discuss various engineering and environmental implications of air pressure fluctuations in coastal aquifers.
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorJiao, JJ
 
dc.contributor.authorLi, H
 
dc.date.accessioned2012-06-26T06:40:40Z
 
dc.date.available2012-06-26T06:40:40Z
 
dc.date.issued2003
 
dc.description.abstractAir pressure in coastal unsaturated aquifers fluctuates with sea tides, as does the groundwater level. Tide-induced air pressure fluctuations in coastal subsurface systems, however, are not well addressed in literature. Significant diurnal air pressure fluctuations are observed below the asphalt pavement in a coastal reclamation area of Hong Kong. A two-dimensional cross-sectional model is built to describe the air-water two-phase flow in the unsaturated zone of the area. TOUGH2, a general-purpose numerical simulation program for multi-dimensional fluid and heat flows of multiphase, multicomponent fluid mixtures in porous and fracture media, is used to obtain the numerical solutions. The numerical simulation reveals that the significant air pressure fluctuation results from a combination of various factors such as asphalt pavement of extremely low permeability, soil structures of the reclamation area, and rainfall intensity during spring tides. Numerical simulation also reveals that the air pressure is approximately proportional to the tidal rate. A great amplitude of the sea level fluctuation will not necessarily lead to high air pressure, if the sea level changes slowly. Coastal unsaturated zones inhale and exhale as the tidal level falls and rises. The paper goes on to discuss various engineering and environmental implications of air pressure fluctuations in coastal aquifers.
 
dc.description.naturelink_to_subscribed_fulltext
 
dc.identifier.citationProceedings Of The 2003 International Symposium On Water Resources And The Urban Environment, 2003, p. 10-13 [How to Cite?]
 
dc.identifier.epage13
 
dc.identifier.scopuseid_2-s2.0-4444249472
 
dc.identifier.spage10
 
dc.identifier.urihttp://hdl.handle.net/10722/152514
 
dc.languageeng
 
dc.relation.ispartofProceedings of the 2003 International Symposium on Water Resources and the Urban Environment
 
dc.relation.referencesReferences in Scopus
 
dc.subjectAir Pressure Fluctuation
 
dc.subjectAir-Water Two-Phase Flow
 
dc.subjectCoastal Aquifer System
 
dc.subjectSea Tide
 
dc.subjectTough2
 
dc.titleTide-induced air pressure fluctuation in coastal unsaturated zones
 
dc.typeConference_Paper
 
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Author Affiliations
  1. Anshan Normal University
  2. The University of Hong Kong