Ribbe, Joachim (2008) Monitoring and assessing salinity and temperature variations in Hervey Bay. Project Report. University of Southern Queensland, Toowoomba, Australia.
This report documents five hydrographic surveys that were conducted in Hervey Bay during September 2004, August 2007, December 2007, May 2008 and June 2008. Four of those were funded by the BMRG activity A0074 - Monitoring and Assessing Salinity and Temperature Variations in Hervey Bay. Each survey covered an area of about 4000 km2. A total of 269 vertical temperature, conductivity and depth (CTD) profiles were collected on a sampling grid of approximately five nautical miles in both longitudinal and latitudinal direction. The hydrographic situations observed document the existence of a hypersalinity or maximum salinity zone along the western region of Hervey Bay in four out of five surveys. The surveys were conducted during a period of variable freshwater supply from precipitation and river discharge which together with evaporation influence salinity within Hervey Bay. The Mary River is the main tributary in the region supplying most of the total river discharge to Hervey Bay. Two particular notable rainfall events took place during August 2007 and May/June 2008, and this report documents the response of Hervey to those events. The August 2007 hydrographic survey followed a rainfall event which had no significant basin-wide impact upon the hypersalinity zone. In contrast, the May/June 2008 rainfall event resulted in the erosion of the hypersalinity zone. In both cases, the Mary River discharge was about the same. The difference in the basin-wide response is most likely due to the more wide-spread rainfall in May/June 2008 which pre-conditioned the Bay and lowered salinity throughout. Mary River discharge subsequently resulted in a complete erosion of the salinity maximum zone. The data reported in this document link river catchments and processes to a coastal system. Changes in river discharges are impacting directly upon the hydrographic structure of Hervey Bay.
|Item Type:||Report (Project Report)|
|Additional Information:||USQ publication.|
|Uncontrolled Keywords:||Hervey Bay, hypersalinity, marine environment, ocean circulation, Queensland, Barrier Reef, coastal lagoon, monitoring, observations|
|Subjects:||260000 Earth Sciences > 260400 Oceanography
260000 Earth Sciences > 260600 Atmospheric Sciences > 260602 Climatology (incl. Palaeoclimatology)
|Depositing User:||Dr Joachim Ribbe|
|Date Deposited:||02 Sep 2008 03:02|
|Last Modified:||10 Sep 2013 23:32|
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