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Spectral shapes and parameters from three different wave sensors

机译：来自三种不同波传感器的光谱形状和参数

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The quality of wave measurements is of primary importance for the validation of wave forecasting models, satellite wave calibration and validation, wave physics, offshore operations and design and climate monitoring. Validation of global wave forecasts revealed significant regional differences, which were linked to the different wave buoy systems used by different countries. To fully understand the differences between the wave measurement systems, it is necessary to go beyond investigations of the integral wave parameters height, period and direction, into the frequency spectra and the four directional Fourier parameters that are used to estimate the directional distribution. We here analyse wave data measured from three different sensors (non-directional Datawell Waverider buoy, WaveRadar Rex, Optech laser) operating at the Ekofisk oil production platform located in the central North Sea over a period of several months, with significant wave height ranging from 1 to 10 m. In general, all three sensors provide similar measurements of the integral wave properties and frequency spectra, although there are some significant differences which could impact design and operations, forecast verification and climate monitoring. For example, the radar underestimates energy in frequency bands higher than 8 s by 3-5%, swell (12.5-16 s) by 5-13%, while the laser has 1-2% more energy than the Waverider in the most energetic bands. Lee effects of structures are also estimated. Lower energy at the frequency tail with the radar has an effect on wave periods (they are higher); wave steepness is seen to be reduced by 10% in the wind seas. Goda peakedness and the unidirectional Benjamin-Feir index are also examined for the three sensors.
机译：波测量的质量对于波浪预测模型，卫星波校准和验证，波理，海上运营和设计和气候监测的验证是主要的重要性。全局波预测的验证揭示了显着的区域差异，与不同国家使用的不同波浮标系统相关联。为了充分了解波测量系统之间的差异，必须超越积分波参数高度，周期和方向的研究进入频谱和用于估计方向分布的四个方向傅立叶参数。我们在这里分析了从位于中央北海的Ekofisk石油生产平台上运行的三种不同传感器（非定向DataWell Waverider Bue，Waveradar Rex，Optech激光）的波浪数据，在几个月内，具有显着的波浪高度范围1到10米。通常，所有三个传感器都提供了相似的积分波属性和频谱的测量，尽管存在一些显着差异可能会影响设计和操作，预测验证和气候监测。例如，雷达低估高于8s的频段的能量3-5％，膨胀（12.5-16s）达到5-13％，而激光比最精力充沛的Waverider比Waverider更高为1-2％的能量乐队。还估计了结构的李效应。雷达频率尾部的较低能量在波期（它们越高）有效;波浪陡度被认为在风海中减少了10％。对于这三个传感器也检查了GODA峰值和单向本杰明 - FEIR指数。

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