TY - JOUR
T1 - Variations in directional wave parameters obtained from data measured using a GNSS buoy
AU - Lin, Yen Pin
AU - Huang, Ching Jer
AU - Chen, Sheng Hsueh
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - This study investigated variations in directional wave parameters by using various combinations of the GNSS buoy data, such as the displacements (enη) and the velocities (uvw) in the east, north, and upward directions. The investigated directional wave parameters included mean wave direction, directional spreading, directional wave spectrum, and dominant wave direction (DWD). The three combinations of GNSS buoy data for determining the directional wave parameters were ηuv, enη, and uvw. Our results revealed that when the significant wave height (HS) values are ≥ 1 m, the signal-to-noise ratios (SNRs) for various measured items are sufficiently large, such that the directional wave parameters obtained from various data, such as enη, uvw, and ηuv, are identical. By contrast, under smooth to slight sea conditions with an HS of <1 m, the SNRs for the displacements are small. The small SNRs of enη data tend to produce inaccurate directional wave parameters. The deviation in the mean wave direction and DWD obtained from the enη data compared with those obtained from the uvw and ηuv data decreases as the HS increases. For small seas, the uvw and ηuv data are more appropriate than the enη data for use in determining directional wave parameters.
AB - This study investigated variations in directional wave parameters by using various combinations of the GNSS buoy data, such as the displacements (enη) and the velocities (uvw) in the east, north, and upward directions. The investigated directional wave parameters included mean wave direction, directional spreading, directional wave spectrum, and dominant wave direction (DWD). The three combinations of GNSS buoy data for determining the directional wave parameters were ηuv, enη, and uvw. Our results revealed that when the significant wave height (HS) values are ≥ 1 m, the signal-to-noise ratios (SNRs) for various measured items are sufficiently large, such that the directional wave parameters obtained from various data, such as enη, uvw, and ηuv, are identical. By contrast, under smooth to slight sea conditions with an HS of <1 m, the SNRs for the displacements are small. The small SNRs of enη data tend to produce inaccurate directional wave parameters. The deviation in the mean wave direction and DWD obtained from the enη data compared with those obtained from the uvw and ηuv data decreases as the HS increases. For small seas, the uvw and ηuv data are more appropriate than the enη data for use in determining directional wave parameters.
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U2 - 10.1016/j.oceaneng.2020.107513
DO - 10.1016/j.oceaneng.2020.107513
M3 - Article
AN - SCOPUS:85085301578
VL - 209
JO - Ocean Engineering
JF - Ocean Engineering
SN - 0029-8018
M1 - 107513
ER -