On errors in low frequency wave measurements from wave buoys
On errors in low frequency wave measurements from wave buoys
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DOI：
10.1016/j.oceaneng.2014.11.033
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发表时间：
2015-02
影响因子：
5
通讯作者：
I. Ashton;L. Johanning
中科院分区：
文献类型：
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作者：
I. Ashton;L. Johanning
浮动海浪浮标被广泛认为是海浪数据的全球标准。海洋可再生能源代表着一个相对较新的海浪测量行业，对资源评估、性能评估和工程设计等应用程序要求很高的精度。这项研究利用四个相同的近距离波浪浮标的独特部署和来自自由浮动浮标的一段时间的数据来将虚假的低频测量归类为错误的。这些误差发生的性质，以及它们对测量有效性的影响也被检验。研究表明，误差与浮标上的阻力有直接关系，但通过正确设计滤光片，可以减小误差对海浪测量的影响。描述了一种可变滤波过程，它提高了由这些浮标捕获的测量的精度。对这些数据的所有解释都建议这样做，这对于任何详细的统计分析都是必不可少的。
Floating wave buoys are widely considered as a global standard for wave data. Marine renewable energy presents a relatively new industry for wave measurements, requiring a high level of accuracy for applications including resource assessment, performance assessment and engineering design. This study draws on the unique deployment of four identical wave buoys in close proximity and a period of data from a free-floating buoy to classify spurious low frequency measurements as erroneous. The nature of the occurrence of these errors, and their effect on the validity of measurements are also examined. The work shows that the errors are directly related to the drag forces on the buoy, but with a correctly designed filter, the effect of the errors on the wave measurements can be mitigated. A variable filter process is described which improves the accuracy of measurements captured by these buoys. This is recommended for all interpretation of these data, and is essential for any detailed statistical analysis.