Extracting Long Waves from Tide-Gauge Records
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134, Issue 5
Abstract
The data processing required to extract long waves from tide-gauge data is described and applied to three diverse but typical examples: meteorologically generated long waves (rissaga), far infragravity waves, and tsunami. The steps are: detiding, despiking, degapping, high-pass filtering, and denoising. Orthogonal wavelet decomposition is used for despiking, high-pass filtering, and denoising. This has the advantage that it can be used for nonstationary data such as rissaga and tsunami because the basis function (the mother wavelet) is localized. The long-wave extraction method has evolved from development of real-time systems for monitoring long waves for navigation purposes. Using the technique, there are hundreds of modern tide gauges around the world (every major port has one) whose data could be used to monitor long waves that affect navigation and cause a hazard.
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Acknowledgments
Data for this project were kindly provided by Prime Port Timaru, Cavotec MoorMaster Ltd. (Salalah data), and Land Information New Zealand (LINZ) and the Antarctic Research Centre of Victoria University of Wellington (Cape Roberts data). Mulgor Consulting Ltd. provided primary funding for the research. The writer also acknowledges funding from the National Institute of Water and Atmospheric Research (NIWA) via the New Zealand Foundation for Research Science & Technology (Contract C01X0401).
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134 • Issue 5 • September 2008
Pages: 306 - 312
Copyright
© 2008 ASCE.
History
Received: Mar 7, 2006
Accepted: Jan 28, 2008
Published online: Sep 1, 2008
Published in print: Sep 2008
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