The SPAIR method: Isolating incident and reflected directional wave spectra in multidirectional wave basins
The SPAIR method: Isolating incident and reflected directional wave spectra in multidirectional wave basins
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DOI：
10.1016/j.coastaleng.2016.04.012
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发表时间：
2016-08-01
影响因子：
4.4
通讯作者：
Johanning, L.
中科院分区：
文献类型：
--
作者：
Draycott, S.;Davey, T.;Johanning, L.
波浪水槽测试的目的是再现现实或现场特定的条件，通常涉及使用定向展开的短波峰海况。为了校准和验证所模拟的海况，需要测量这些方向特性。常用的基于定向扩展函数的定向频谱重建方法具有与之相关的固有的不确定性水平。为了减少方向谱验证中的不确定性，本文提出了一种结合定向测波仪阵列的SPAIR(Single-Summent PTPD Approach with In-Line Refltions)方法。在英国爱丁堡的FloWave海洋能源研究设施中，产生了各种波浪条件，以获得一系列的海况和反射情景。与标准方法相比，提出的方法提供了更好的方向谱估计，在海况范围内将平均视方向偏差降低到6%以下。此外，该方法在频域和时间域上都分离了入射和反射光谱，并且可以将这些波系分离超过360。结果表明，该方法的精度对同轴反射的程度只有轻微的敏感性，但目前还不能处理斜反射。Spair方法，如所提出的或稍加修改，将允许更有效地验证复杂的方向性海况，使多方向波浪盆地能够以更高的信心模拟现实的波浪情景。(C)2016年提交人。爱思唯尔出版公司(Elsevier B.V.)
Wave tank tests aiming to reproduce realistic or site specific conditions will commonly involve using directionally spread, short-crested sea states. The measurement of these directional characteristics is required for the purposes of calibrating and validating the modelled sea state. Commonly used methods of directional spectrum reconstruction, based on directional spreading functions, have an inherent level of uncertainty associated with them. In this paper we aim to reduce the uncertainty in directional spectrum validation by introducing the SPAIR (Single-summation PTPD Approach with In-line Reflections) method, in combination with a directional wave gauge array. A variety of wave conditions were generated in the FloWave Ocean Energy Research Facility, Edinburgh, UK, to obtain a range of sea state and reflection scenarios. The presented approach is found to provide improved estimates of directional spectra over standard methods, reducing the mean apparent directional deviation down to below 6% over the range of sea states. Additionally, the method isolates incident and reflected spectra in both the frequency and time domain, and can separate these wave systems over 360. The accuracy of the method is shown to be only slightly sensitive to the level of in-line reflection present, but at presentcannot deal with oblique reflections. The SPAIR method, as presented or with slight modification, will allow complex directional sea states to be validated more effectively, enabling multidirectional wave basins to simulate realistic wave scenarios with increased confidence. (C) 2016 The Authors. Published by Elsevier B.V.