Time series surface-wave recovery from pressure gage |
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| Authors: | Hsiang Wang Dong-Young Lee Allen Garcia |
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| Institution: | 1. OSPL – Ocean Space Planning Laboratory, Department of Systems Innovation, School of Engineering – The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-8656, Japan;2. Department of Mobility Engineering, Federal University of Santa Catarina, Joinville, SC, Brazil;3. TPN – Numerical Offshore Tank Laboratory, Department of Naval Architecture and Ocean Engineering, Escola Politécnica - University of São Paulo, São Paulo, SP, Brazil;4. OSPL – Ocean Space Planning Laboratory, Department of Ocean Technology, Policy, and Environment, School of Frontier Sciences – The University of Tokyo, Kashiwa-Shi, Chiba, Japan |
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| Abstract: | Recovery of surface-wave time series from pressure gage data is a time-consuming process and is not customarily carried out. Such information is, however, useful particularly in real-time for warning of freak waves or waves of unusual characteristics. Two simple numerical filters are developed here to serve such purpose. The first method is a linear filter with a built-in window to suppress high-frequency noise. The second method recovers the surface wave by computing the local surface curvature. These filters are very simple and can be programmed into a microprocessor to be integrated into field instrument packages.Both filters have been tested satisfactorily against conventional linear filters using simulated wave data and wave data collected in intermediate water depth. Neither filter requires pre-filtering of noise from raw data, which is commonly required to recover surface-wave information from sub-surface pressure data. |
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