Salinity observations in a subtropical estuarine system on the Gold Coast, Australia

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Title Salinity observations in a subtropical estuarine system on the Gold Coast, Australia
Author Benfer, Nathan Peter; King, B. A.; Lemckert, Charles James
Journal Name Journal of Coastal Research
Year Published 2007
Place of publication USA
Publisher Coastal Education & Research Foundation
Abstract Saltwater Creek and Coombabah Creek are branches of the Coomera River estuary situated within the subtropical Gold Coast City region, Australia, where fresh water flushing occurs during the wet season. The two creek systems are physically adjacent to each other and join at a confluence before connecting to the lower Coomera River. Saltwater Creek is 17 km long and is joined again halfway up its tidal section, via an anabranch, to Coomera River. Coombabah Creek leads upstream to Coombabah Lake, a large shallow lake ringed by mangrove swamps. In order to develop an understanding of how these systems interact with each other, in particular their salinity dynamics, at time scales ranging from tidal to annual, three field studies were undertaken. Field measurements confirmed that the salinity dynamics of these systems were dominated by rainfall and tidal events, typical of estuaries during the 'wet season' in subtropical environments. In contrast, the studies found that hypersaline conditions (salinity as high as 42 psu) developed upstream during the 'dry season' within Coombabah Lake due to the evaporative effects of its large shallow area and adjoining mangrove swamps. Further, the data also revealed that during the dry season, Saltwater Creek's high frequency salinity fluctuations were in-phase with tidal oscillations while Coombabah Creeks' were out-of-phase despite their close proximity. The mechanism for this was attributed to ebb tidal currents in Coombabah Creek which flushed hypersaline water out of the lake past the confluence, and the following flood tidal currents bringing that water into Saltwater Creek. The studies also identified a low
Peer Reviewed Yes
Published Yes
Publisher URI http://www.cerf-jcr.org/
Copyright Statement Copyright 2007 CERF. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 50
Page from 646
Page to 651
ISSN 0749-0208
Date Accessioned 2008-02-18
Date Available 2008-07-16T01:25:14Z
Language en_AU
Research Centre Centre for Infrastructure Engineering and Management
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Physical Oceanography
URI http://hdl.handle.net/10072/17930
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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