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| Titel |
Hydrodynamics of a small trained tidal inlet (Currumbin Creek, Australia) |
| VerfasserIn |
S. Shaeri, R. B. Tomlinson, A. Etemad-Shahidi, D. Strauss, L. P. Hughes |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Proceedings of river, coastal and estuarine morphodynamics ; Nr. 39 (2014-04-01), S.45-53 |
| Datensatznummer |
250121303
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| Publikation (Nr.) |
 copernicus.org/adgeo-39-45-2014.pdf |
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| Zusammenfassung |
Small tidal inlets are important features of coastal
areas, in terms of provision of access from a back barrier water-body to the
ocean as well as periodic circulation of fresh nutrients for the local
ecology. Usually, dimensional and geometrical characteristics contribute
significantly to morphological stability or instability of a particular
inlet and necessitate an individual investigation of any desired location.
In other words, generalized usage of previous empirical and experimental
research of a different position can hardly be used for other places. In
this regard, one of the powerful tools to understand the physical processes
of a particular region is to collect as much field data as possible. Such a
dataset is used to further analyse and explore the governing processes and
can also be used for building a numerical computer model for supplementary
studies.
In this research, the results of a comprehensive field measurement at
Currumbin Creek, Queensland, Australia are presented. This study is part of
broader research to investigate the long term evolution of the Currumbin
entrance and its adjacent beaches. Currently, an annual dredging campaign is
needed to reduce the risk of flooding due to excess rainfall inundations and
to maintain water quality.
The majority of data were collected over a three month period consistent
with the time of the 2012 dredging operation. However, due to the loss of
some instrumentation, data collection for some of the parameters was
repeated till the middle of May 2013. All collected data included: (1)
nearshore waves and tide; (2) creek tidal variation; (3) creek flow discharge
and velocity; (4) bathymetric survey of the creek; (5) beach profile evolution
survey; and (6) sediment sampling. The measurement showed that the creek
entrance is tidally dominated, with flood events having a major role in
sediment transport into the creek. The nearshore stations' wave data
illustrated the marginal effect of the beach curvature between updrift and
downdrift stations. Thus, the historical dataset available from the updrift
wave rider buoy will be selected to be used for future numerical modelling.
Although changes of some beach profiles were comparatively insignificant,
the dramatic changes of the profile lines nearby the inlet channel and also
rapid bathymetric change of the flood shoal following the dredging
completion are valuable information to better calibrate and interpret a
local sediment modelling study for the next phase. Essentially, this
evaluation needs to be considered for proposing any alternative maintenance
activities. |
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