A Fourier-Based Method for the Distribution of Breaking Crests from Video Observations
A Fourier-Based Method for the Distribution of Breaking Crests from Video Observations
复制标题
基于傅里叶的视频观测中断裂波峰分布的方法
DOI：
10.1175/2009jtecho622.1
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
A. Jessup
中科院分区：
文献类型：
--
作者：
J. Thomson;A. Jessup
提出了一种基于傅立叶变换的水波视频观测处理方法，并计算了波浪破碎波峰长度的速度分布。与传统的在时域中跟踪单个波峰来组装分布的算法相比，该方法提高了效率和鲁棒性。该方法进行了测试，使用现场观测（白浪的视频图像）的取数有限的破碎波在低（6.7米21），中等（8.5米21），高（12.6米21）风速的情况下进行研究。该方法给出了与传统算法一致的分布，包括与直接观测一致的破碎率。结果应用于获得远程估计的能量耗散与波破碎。
A Fourier-based method is presented to process video observations of water waves and calculate the speed distribution of breaking crest lengths. The method has increased efficiency and robust statistics compared with conventional algorithms that assemble distributions from tracking individual crests in the time domain. The method is tested using field observations (video images of whitecaps) of fetch-limited breaking waves during case studies with low (6.7 m s 21 ), moderate (8.5 m s 21 ), and high (12.6 m s 21 ) wind speeds. The method gives distributions consistent with conventional algorithms, including breaking rates that are consistent with direct observations. Results are applied to obtain remote estimates of the energy dissipation associated with wave breaking.