Time series of sea level measurements from different instruments deployed around the Haifa Bay area are analyzed. All observations indicate the existence of persistent low frequency oscillations with periods corresponding to approximately 1 hour and to approximately 30 minutes. These oscillations are persistent throughout most of the year and reached maximal wave heights of around 30 cm, a comparable value to tidal variations, making these oscillations an important factor in determining the average sea level elevation. The work identifies the phenomenon as resonant trapped waves, which are normal modes of the continental shelf extending from Haifa promontory to Achziv Canyon. Their temporal and spatial characteristics are learned through field measurement data analysis, wavelet analysis, numerical simulations, and exploration of an analytic solution. Finally, possible mechanisms for the generation of these waves are discussed. Such waves, which are commonly not surveyed, can be an important factor affecting coastal dynamics such as breaker line and coast line locations. Furthermore, the resonance behavior found has the capability of increasing the deep‐to‐shallow amplitudes in up to two orders of magnitude depending on incident angle. Noting that seismic or atmospheric events can agitate oscillation with similar wave periods, the intensification poses a hazard to Haifa Bay and coastal area.

中文翻译：

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以色列北部大陆架上的陷波低频波

分析了部署在海法湾地区周围不同仪器的海平面测量的时间序列。所有观察结果表明存在持续的低频振荡，其周期对应于大约1小时和大约30分钟。这些振荡在一年中的大部分时间持续存在，并达到约30 cm的最大波高，与潮汐变化相当，这使得这些振荡成为确定平均海平面升高的重要因素。这项工作将现象识别为共振陷波，这是从海法海角到阿奇齐夫峡谷延伸的大陆架的正常模式。它们的时空特征是通过现场测量数据分析，小波分析，数值模拟，和分析解决方案的探索。最后，讨论了产生这些波的可能机制。通常没有进行勘测的此类波浪可能是影响沿海动力（如断路器线和海岸线位置）的重要因素。此外，根据入射角，发现的共振行为具有将深到浅振幅增加多达两个数量级的能力。注意到地震或大气事件会在相似的波浪周期内引起振荡，因此这种加剧对海法湾和沿海地区构成危害。根据入射角，发现的共振行为具有将深到浅振幅增加多达两个数量级的能力。注意到地震或大气事件会在相似的波浪周期内引起振荡，因此这种加剧对海法湾和沿海地区构成危害。根据入射角，发现的共振行为具有将深到浅振幅增加多达两个数量级的能力。注意到地震或大气事件会在相似的波浪周期内引起振荡，因此这种加剧对海法湾和沿海地区构成危害。