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The dynamics of a bathymetrically arrested estuarine front
Authors:Linda M Huzzey
Institution:Coastal Studies Unit, University of Sydney, Sydney, Australia 2006
Abstract:The mixing and circulation associated with a bathymetrically arrested estuarine front was studied using hydrographic and current data. A quasisteady front, exhibiting strongly convergent surface flows, is formed along the steeply sloping inner margins of the flood tide delta during each semidiurnal tide cycle. This front separates the brackish ambient water within a deep estuarine basin from the incoming oceanic tidal water. The position of the front is dependent on the local water depth and the difference in density between the two water masses. Beneath the surface there is an inclined frontal interface where static stability is very low and vertical mixing intense. A vertically integrated horizontal momentum equation was derived for flow in the upper layer and an estimate made as to the value of the associated entrainment coefficient.
Keywords:fronts  entrainment  density current  estuarine circulation  dynamic balance  bathymetry  semidiurnal tide  Australia Coast
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