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Updated: May 12, 2025

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Published on: February 13, 2018
Observation of forward-direct onshore and backscattered waves in water propagating in a wedge-shaped ocean
Xiaohan Wang1,2,3, Yang Dong1,2,3, Shengchun Piao1,2,3
1National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.
Abstract:
To investigate low-frequency acoustic propagation in a wedge-shaped ocean, two ocean bottom seismometers (OBSs) were deployed on the seabed and a land-based seismometer (LS) was positioned near the coastline. A broadband acoustic source (airgun) generated signals at a standoff distance. The OBSs captured forward-direct waves and backscattered waves, while the LS detected shore-coupled forward-direct arrivals. Spectral element modeling revealed a frequency-dependent propagation mechanism: High-frequency components (>200 Hz) of the normal modes exhibited strong backscattering from the seabed slope, while low-frequency components (<200 Hz) of the first normal mode coupled into the seabed sediment and propagated onshore as geoacoustic waves.
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