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首页> 外文期刊>Natural hazards and earth system sciences >Statistical properties of coastal long waves analysed through sea-leveltime-gradient functions: exemplary analysis of theSiracusa, Italy, tide-gauge data
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Statistical properties of coastal long waves analysed through sea-leveltime-gradient functions: exemplary analysis of theSiracusa, Italy, tide-gauge data

机译：通过海平面时梯度函数分析的沿海长波的统计特性：意大利锡拉库扎的示例性分析，潮汐计数据

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This study presents a?new method to analyse the properties of the sea-levelsignal recorded by coastal tide gauges in the long wave range that is ina?window between wind/storm waves and tides and is typical of severalphenomena like local seiches, coastal shelf resonances and tsunamis. Themethod consists of computing four specific functions based on the timegradient (slope) of the recorded sea level oscillations, namely theinstantaneous slope (IS) as well as three more functions based on IS, namely thereconstructed sea level (RSL), the background slope (BS) and the control function (CF). These functions are examined through a traditional spectral fast Fourier transform (FFT) analysis and also through a?statistical analysis, showing that they can be characterised by probability distribution functions PDFs such as the Student's t?distribution (IS and RSL) and the beta distribution (CF). As an example, the method has been applied to data from the tide-gauge station of Siracusa, Italy.
机译：这项研究提出了一种新的方法来分析由沿海潮汐仪在长波范围内记录的海平面信号的特性，该范围是在风/风暴波和潮汐之间的窗口，并且是一些典型的现象，例如局部seiches，沿海架子共振和海啸。该方法包括根据记录的海平面振荡的时间梯度（斜率）计算四个特定功能，即瞬时斜率（IS）以及基于IS的另外三个功能，即构造海平面（RSL），背景斜率（BS） ）和控制功能（CF）。这些函数通过传统的频谱快速傅立叶变换（FFT）分析以及统计分析进行了检验，表明它们可以用概率分布函数PDF（例如学生的 t 分布（IS）和RSL）和beta分布（CF）。例如，该方法已应用于意大利锡拉库扎潮汐计测站的数据。

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