Field measurements of surface waves using a 5-beam ADCP
Field measurements of surface waves using a 5-beam ADCP
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DOI：
10.1016/j.oceaneng.2015.12.025
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发表时间：
2016-01
影响因子：
5
通讯作者：
A. Bouferrouk;Jean-Baptiste Saulnier;George H. Smith;L. Johanning
中科院分区：
文献类型：
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作者：
A. Bouferrouk;Jean-Baptiste Saulnier;George H. Smith;L. Johanning
本研究探讨了一种改进的5波束ADCP的性能，与垂直波束，当部署到测量非定向波在沃茨的深度为40米。为了评估性能，ADCP与四个同位定向波浮标进行了比较。垂直波束测得的表面高程谱与浮标在0.10-0.35 Hz范围内的估计值相当。除峰值周期外，垂直波束的波高、平均能量周期和谱带宽的谱估计值与浮标的估计值吻合良好，仅显示出2- 7%的微小差异。在某些情况下，ADCP或浮标可以分辨其他传感器无法分辨的特定波浪系统，尽管其中一些情况可能是数值伪影的结果。在低频率下，ADCP对涌浪分量表现出更好的灵敏度，虽然浮标可以产生低频峰值，但在低能海况下，两种传感器之间的差异特别明显。在高频下，两个传感器都可能对噪声敏感。该研究旨在提高使用垂直波束的5波束ADCP的置信度，以及其与不同波浪传感器的比较性能。
This study examines the performance of an improved 5-beam ADCP, with a vertical beam, when deployed to measure non-directional waves in waters of 40 m depth. To assess the performance, the ADCP is compared with four co-located directional wave buoys. The surface elevation spectra as measured by the vertical beam compare well with estimates from the buoys in the range 0.10–0.35 Hz. Except for peak period, spectral estimates of wave height, mean energy period and spectral bandwidth from the vertical beam agree well with estimates from the buoys, showing only small differences of 2–7%. Some cases exist where either the ADCP or the buoys can resolve particular wave systems that the other sensor cannot resolve, though some of these instances may be the result of numerical artefact. At low frequencies, the ADCP shows a better sensitivity to swell components, and though the buoys can produce low frequency peaks, the difference between the two sensors is particularly evident during low energy sea states. At high frequencies, both sensors may show susceptibility to noise. The study intends to increase the level of confidence in using a 5-beam ADCP with a vertical beam, and of its comparative performance with a different wave sensor.