| Citation: | CHENG Chen,TANG Zhenyu,TAN Daoyuan,et al. Study on wave impact patterns under tidal influence based on distributed acoustic sensing[J]. Bulletin of Geological Science and Technology,2026,45(3):1-12 doi: 10.19509/j.cnki.dzkq.tb20250015 |
Wave impact under tidal influence is a critical factor affecting coastal erosion. However, studies focusing on the independent effects of tidal characteristics on wave impact remain relatively limited. This study aims to quantitatively analyze wave impact intensity under tidal influence and its relationship with tidal characteristics and topography, providing a scientific basis for research on coastal erosion mechanisms and the design of coastal protection engineering.
Using distributed acoustic sensing (DAS) technology, the wave impact processes along the northern coast of Zhairuoshan Island, Zhoushan, Zhejiang Province were effectively monitored for 21 days. A 160-meter fiber-optic sensing cable was deployed for DAS measurements, and the dynamic patterns of wave impact under tidal influence were analyzed by integrating power spectral density (PSD) energy and tidal data.
The results showed that tidal height, tidal intensity, and topographic features collectively affected the intensity and distribution of wave impact. During the observation period, wave impact intensity showed consistency with tidal intensity variations. Wave impact was most significant during spring tides, particularly when high-tide levels exceeded a specific threshold, and the impact was significantly enhanced. During intermediate tides, wave impact exhibited multi-stage and multi-peak characteristics. In contrast, wave impact during neap tides was relatively weak and mainly concentrated during the ebb tide phase. In addition, topographic features significantly regulated the spatial distribution of wave impact. The eastern coast experienced prolonged impact due to extended tidal duration, while concave areas exhibited weaker impact due to wave cancellation induced by tidal currents.
This study verifies the effectiveness of DAS technology in monitoring wave impact patterns under tidal influence, reveals the synergistic regulation mechanisms of tidal characteristics and topographic factors on wave impact, and provides important data support for a deeper understanding of wave impact dynamics and optimization of coastal protection strategies.
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