利用海底光纤电缆上的分布式声学传感技术对近岸海流进行近实时现场监测

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS Earth and Space Science Pub Date : 2024-09-07 DOI:10.1029/2024EA003572
Zhenghong Song, Xiangfang Zeng, Sidao Ni, Benxin Chi, Tengfei Xu, Zexun Wei, Wenzheng Jiang, Sheng Chen, Jun Xie
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引用次数: 0

摘要

在近岸区域,由于潮汐、河流和海岸线之间的相互作用,洋流显示出错综复杂的特性,这使得精确的洋流建模具有挑战性。高时空分辨率的连续原位观测有助于更好地了解这些洋流的动态。在这项研究中,我们利用 10 公里长的海底光缆和分布式声学传感技术记录了与海浪相关的地震信号。利用频率-波数分析法和理论海洋波传播方程,从速度频散中获得了海流速度和水深。结果与附近海流计的观测结果非常吻合,证实了潮汐流以及小尺度残余海流的主导地位。水深的时间变化与附近测潮仪的观测结果一致。这项研究证明了利用海底光缆进行长期、高分辨率、近实时近岸海流监测的潜力。
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Near Real-Time In Situ Monitoring of Nearshore Ocean Currents Using Distributed Acoustic Sensing on Submarine Fiber-Optic Cable

In the nearshore area, ocean current display intricate complexities due to interactions among tide, river, and coastline, which makes accurate current modeling challenging. Continuous in situ observation with high spatial and temporal resolution helps to better understand the dynamics of these currents. In this study, we used a 10-km long submarine fiber-optic cable with distributed acoustic sensing technology to record seismic signals associated with ocean waves. The current velocity and water depth were obtained from the velocity dispersion using frequency-wave number analysis matched against theoretical ocean wave propagation equations. The results show remarkable agreement with observation of a nearby current meter, confirming the dominance of tidal currents as well as a small-scale residual current. The temporal variation of water depth is consistent with observation by a nearby tidal gauge. This study demonstrates the potential of using submarine fiber-optic cable for long-term, high-resolution, near real-time nearshore current monitoring.

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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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