Spatial variability of wave fields over the scale of a wave energy test site
Spatial variability of wave fields over the scale of a wave energy test site
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波浪能试验场范围内波场的空间变化
DOI：
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发表时间：
2011
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通讯作者：
I. Ashton
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文献类型：
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作者：
I. Ashton
波浪能应用需要精确的波浪测量，包括资源评估和性能评估。作为响应，通常使用波浪浮标或其他点波浪传感器从部署地点测量波浪数据。波场的空间变化会给从单个点捕获的代表单独位置或区域的数据分析带来不准确性。本论文描述了为量化空间变化对波浪能站点直接波浪测量精度的影响而进行的研究。在英国康沃尔郡 Wave Hub 波浪能试验场附近的位置部署了四个时间同步波浪浮标阵列，间隔 500m。这些数据在数据处理和质量控制方面受到严格审查，这引发了有关新测量设施的数据处理和波浪数据验证的具体问题。针对从该设施捕获的数据提出了具体建议，并开发了定制的质量控制程序。该过程最大限度地减少了错误对处理数据的可能影响，这在分析同步数据集时被认为是最重要的，并提供了特别适合检查海浪空间特征的数据集。同时数据之间的差异表明，局部物理过程导致测量站点处的波之间存在确定性差异，这导致站点内不同位置的功率统计数据之间存在显着差异。根据抽样理论，观察到测量值之间的瞬时差异与随机误差的理论估计非常吻合。该研究的高潮是对波浪能试验场规模的海洋波浪场的空间特性进行了独特的分析，与波浪能试验场的开发和监测直接相关。
Accurate wave measurements are required for wave energy applications, including resource assessments and performance assessments. In response, wave data are measured from deployment sites, commonly using wave buoys or other point wave sensors. Spatial variability in the wave field will introduce inaccuracies to the analysis of data captured from a single point to represent a separate location or area. This thesis describes research undertaken to quantify the effect of spatial variability on the accuracy of direct wave measurements taken at a wave energy site. An array of four timesynchronised wave buoys were deployed, separated by 500m, in a location close to the Wave Hub wave energy test site in Cornwall, UK. These data were subject to close scrutiny in terms of data processing and quality control, which raised specific issues regarding data processing and the validation of wave data for a new measurement facility. Specific recommendations are made for data captured from this facility, and bespoke quality control routines were developed. This process minimises the possible contribution of errors to the processed data, which is observed to be of the highest importance when analysing simultaneous data sets, and provides a data set that is particularly suited to the examination of the spatial characteristics of ocean waves. The differences between simultaneous data demonstrated local physical processes to be causing a deterministic difference between the waves at the measurement sites, which contributed to a significant difference between the power statistics at different locations within the site. Instantaneous differences between measurements were observed to agree well with theoretical estimations of random error, based on sampling theory. The culmination of the research is a unique analysis of the spatial properties of ocean wave fields on the scale of a wave energy test site, of direct relevance to the development and monitoring of wave energy test sites.