Abstract
Slope stability is a key problem for safe submarine channel operation on muddy coasts. The early detection and identification of slope instabilities is important to allow safety measures to be taken in a timely manner. Owing to the difficulties in predicting or providing early forecasts of slope collapse in muddy submarine channels, this study introduces a bidimensional empirical mode decomposition (BEMD) with adaptive time–frequency resolution to identify slope instabilities using sound prints of sub-bottom profile images. The results show that three bidimensional intrinsic mode function (BIMF) images decomposed by BEMD with frequencies ranging from high to low can depict the spatial variation in the sound prints. The second and third BIMF images reveal the spatial relationship between the sound prints and the slope abnormalities at the early stage of slope collapse. This approach effectively identifies the early sound prints and the spatial information of the sub-bottom profile images during the process of slope collapse, which can improve abnormal feature recognition. This method will help in the prediction and early forecast of channel slope instability and collapse.
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Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
The author would like to thank Wang X, Xu J, Wang Y, Feng J W, and Liu Z Y, who are Marine Technology undergraduate students, and Liu T P, Li T Y, and Chang T Y, who are Marine Resources Development Technology undergraduate students at Jiangsu Ocean University for their help with the fieldwork and laboratory experiments.
Funding
This work was supported by the Key Research and Development Program of Jiangsu Province (grant number BE2018676) and a project funded by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.
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Zhang, C. Slope instability detection for muddy submarine channels using sub-bottom profile images based on bidimensional empirical mode decomposition. Geo-Mar Lett 41, 1 (2021). https://doi.org/10.1007/s00367-020-00681-5
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DOI: https://doi.org/10.1007/s00367-020-00681-5