Studies Toward the Development of Accurate Directional Spectrum Estimation Method Using Field Observation Data
Studies Toward the Development of Accurate Directional Spectrum Estimation Method Using Field Observation Data
复制标题
利用现场观测数据开发精确定向谱估计方法的研究
DOI：
10.1115/omae2019-95220
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
and T. Fujiki
中科院分区：
文献类型：
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作者：
Hashimoto N.;M. Mitsui;K. Kawaguchi;and T. Fujiki
升级后的水下多普勒型定向波计（DWM）可以测量与定向波运动相关的31个波量，即水面高程、从浅到深10个不同水深的每层水粒子速度的3个分量。在本研究中，研究了用DWM测量的不同数量的波量的不同集合来估计方向谱的各种情况下，方向谱估计的精度。结果表明，在某些波浪条件下，与应用少量波浪量的情况相比，应用较多波浪量的估计精度得到了提高。另一方面，通过在深水处加入水粒子速度分量来估计方向谱时，方向函数的能量浓度与深水水粒子速度分量的观测层数成正比。由于在研究DWM观测到的方向谱特征时需要明确这一特征，我们将继续进行进一步的研究，以获得更准确、更可靠的方向谱估计。
An upgraded submerged Doppler-type directional Wave Meter (DWM) can measure 31 wave quantities related to directional wave motions, i.e., water surface elevation, 3 components of water particle velocities at each layer of 10 different water depths ranging from shallow to deep. In this study, accuracy of directional spectrum estimation is investigated for various cases where directional spectra are estimated with various sets of different number of wave quantities measured with DWM. As a result, accuracy improvement is confirmed in some wave conditions when more quantities are applied to the estimations, compared with the cases where a few wave quantities are applied to the estimations. On the other hand, it was found that when the directional spectra are estimated by adding the water particle velocity components at the deep water depths, the energy concentration of the direction function tends to be estimated higher in proportion to the number of observation layers of the deeper water particle velocity components. Since this feature should be clarified in investigating characteristics of directional spectra observed with DWM, we will continue further investigation for more accurate and reliable directional spectrum estimation.