Hervey Bay: an inverse subtropical estuary

Ribbe, Joachim (2007) Hervey Bay: an inverse subtropical estuary. In: Inaugural Queensland Coastal Conference 2007: Shifting Sands, 17-19 Sept 2007, Bundaberg, Australia.

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Abstract

[Abstract]: Declining rainfall, persistent drought conditions along Queensland coasts and increasing temperatures are impacting upon hydrological and coastal marine conditions. During a four day hydrographic survey into Hervey Bay, near-coast salinity values were found to be higher than those of oceanic water. This distribution of salinity is indicative of an inverse circulation within the Bay. The evaporation-precipitation-runoff balance which is dominated by a net loss of freshwater leading to the production of high salinity water during the period of the survey yields further evidence of a possible inverse circulation within the Bay. To compensate for the export of this high salinity water, oceanic water with lower salinity is entering the Bay at the surface. Analysis of the historical water balance indicates that the inverse circulation is likely to be a climatological feature of this estuary which is not limited to the dry season of the year. Simple physical modelling of the oceanic circulation led to some insight into Bay flushing and water exchange time scales between Bay and oceanic water. Due to declining rainfall in coastal northeast Australia, inverse circulation conditions are likely to persist into the near future and should to be considered for coastal management.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Additional Information: Deposited with permission of publisher.
Depositing User: Dr Joachim Ribbe
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 06 May 2008 04:34
Last Modified: 02 Jul 2013 22:52
Uncontrolled Keywords: rainfall, coastal circulation, inverse estuary, climate variability, drought, Hervey Bay, hydrological cycle, salinity, coastal management
Fields of Research (FOR2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040104 Climate Change Processes
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040605 Palaeoclimatology
04 Earth Sciences > 0405 Oceanography > 040503 Physical Oceanography
URI: http://eprints.usq.edu.au/id/eprint/3389

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