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Field Measurement for Investigating the Dynamics of Tallebudgera Creek Tidal-Inlet Entrance

Author(s): Saeed Shaeri; Rodger B. Tomlinson; Amir Etemad-Shahidi; Darrell Strauss; Shannon Hunt

Linked Author(s): Rodger Tomlinson, Saeed Shaeri

Keywords: Tidal discharge and prism; Tidal level; Tidal velocity; Tidal constituents; Drogue tracking

Abstract: This study is part of a broader research project to build a longer, more durable and stable tidal-inlet entrance channels in Tallebudgera Creek. The Creek is one of several small tidal inlets in south-eastern Queensland, Australia. A long history of morphological changes of the mouth and entrance channel has made the local authority perform series of stabilization works and maintenance dredgings. However, this waterway becomes fully nonoperational each year, which necessitates frequent dredging. Therefore an effective long-term management plan is essential. To provide the required environmental information for such plan, a field measurement campaign was carried out in March, 2011 which included measurement of nearshore wave regimes, tidal levels and currents inside the creek; and also drogue tracking in the inlet entrance. Wave data was collected during a six week period by ADCPs at a water depth of about 7 to 8 m. Tidal current discharges were also measured by an ADCP over two tidal cycles of 14. 5 (spring) and 16 (neap) hours. Water levels were recorded using a Valeport Water Level Recorder for the whole measuring period. The investigations show that the creek is mixed, but mostly flood dominated. Therefore, there is a potential for sediments to rapidly infill the entrance and for the entrance to be dominated by natural bypassing. These findings will contribute to the design of alternative entrance geometry or maintenance strategies for Tallebudgera Creek.


Year: 2013

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