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Coastal tide gauge calibration: a case study at Macquarie Island using GPS buoy techniques.

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Watson, CS and Coleman, R and Handsworth, R (2008) Coastal tide gauge calibration: a case study at Macquarie Island using GPS buoy techniques. Journal of Coastal Research, 24 (4). pp. 1071-1079. ISSN 0749-0208

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Abstract

Tide gauges remain the fundamental instrument used to measure water level in the coastal environment. Issues
surrounding the calibration and vertical datum control of tide gauges are therefore fundamental in studies involving
the determination of absolute sea level and its variation over time. Macquarie Island, located in Australian sub-
Antarctic waters (54°30' S, 158°57' E), represents one of the few possible locations in the Southern Ocean to observe
sea level using traditional tide gauge techniques. The wave and atmospheric climatology of the region, coupled with
a rugged coastline, makes the operation of a modern tide gauge installation extremely difficult. To overcome many of
these difficulties, researchers use an acoustic gauge operated within an inclined shaft that is drilled through a coastal rocky outcrop. The calibration requirements of the gauge are therefore problematic and require special consideration
to enable the accurate calculation of mean sea level and its change over time. We present results from a novel
application of a GPS-equipped buoy to achieve an in situ calibration of the tide gauge, solving for scale, vertical offset,
and sea state-dependent bias parameters. The methodology provides a new, high precision technique using available
instrumentation, allowing users to maximise the oceanographic and geodetic value of tide gauge observations.

Item Type: Article
Keywords: Acoustic tide gauge, sea level, GPS buoy, calibration methodology.
Journal or Publication Title: Journal of Coastal Research
Page Range: pp. 1071-1079
ISSN: 0749-0208
Identification Number - DOI: 10.2112/07-0844.1
Date Deposited: 22 Jun 2010 05:22
Last Modified: 18 Nov 2014 04:11
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