Journal
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING
Volume 145, Issue 1, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)WW.1943-5460.0000481
Keywords
Wave conditions; Fjord; Field measurement; Ship waves; Inhomogeneous waves
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Funding
- Norwegian Public Road Administration (NPRA)
- Research Council of Norway through the Centre for Ships and Ocean Structures (CeSOS)
- Centre for Autonomous Marine Operations and Systems (AMOS) at the Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway
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Due to the complex topography in a fjord, wave conditions differ from those of ocean waves. In this study, characteristics of wave conditions in the BjOrnafjorden in Hordaland County, Norway were thoroughly investigated based on field measurements. BjOrnafjorden is approximately 4,600 m wide and more than 500 m deep, with a complex hydrography and topography. Three Datawell Waveriders (DWRs, Datawell, Haarlem, Netherlands) were deployed to measure the wave data. Due to two ferry routes nearby, the measured raw data were found to be influenced by ship waves. Thus, a band-pass filter based on wavelet and inverse wavelet analyses was proposed and developed to detect and remove ship waves from raw data. The wave data analyzed were measured over approximately 19 months. The wave conditions measured by each DWR were characterized by several parameters, such as significant wave height, average zero upcrossing period, and dominant direction. The values of each wave parameter at each DWR usually differed, which indicates that the wave field in BjOrnafjorden is inhomogeneous. The statistical values of these parameters among the three DWRs were correlated to some extent. Their distribution could not be fitted by a suitable distribution function unless more data were available. The coherence among the three DWRs was fairly low.
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