首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering, Jun 23-28, 2002, Oslo, Norway >'USEFUL MEAN DURATION'―AN ALTERNATIVE TO THE 'MEAN DURATION' STATISTIC FOR WAVE HEIGHT AND OTHER METOCEAN PARAMETERS
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'USEFUL MEAN DURATION'―AN ALTERNATIVE TO THE 'MEAN DURATION' STATISTIC FOR WAVE HEIGHT AND OTHER METOCEAN PARAMETERS

机译:“有用的平均持续时间” —“平均持续时间”统计数据的高度和其他平均参数的替代方法

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The probability distribution of the duration of events where the wave height or other metocean parameter X(t) is under or over a specified level X = u is of great importance for the planning of offshore engineering operations. The mean duration, estimated by adding up the durations of the events and dividing by the number of such events, is an often-used measure, but it depends on the recording interval (the time interval between successive measurements). We show that the dependence of the estimated mean duration on the recording interval At is related to the behavior of the mean absolute discrete derivative E[|X(t + Δt) ― X(t)|/Δt] as a function of Δt, and also to the fractal dimension of the level set of points where X(t) crosses X = u. An alternative useful mean duration is proposed, which weights each event by its own duration. Analysis of offshore wave data confirms the stability of this parameter to changes in recording interval.
机译:波高或其他海洋参数X(t)低于或超过指定水平X = u的事件持续时间的概率分布对于海上工程作业的规划非常重要。通过将事件的持续时间相加并除以此类事件的数量来估算的平均持续时间是经常使用的度量,但它取决于记录间隔(连续测量之间的时间间隔)。我们表明,估计平均持续时间对记录间隔At的依赖性与平均绝对离散导数E [| X(t +Δt)― X(t)| /Δt]随Δt的变化有关,以及X(t)越过X = u的点的水平集的分形维数。提出了另一种有用的平均持续时间,该平均持续时间按事件本身的持续时间加权。对海上波浪数据的分析证实了该参数对记录间隔变化的稳定性。

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