Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (1): 1-8.DOI: 10.3969/j.issn.1001-909X.2020.01.001

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The application research of Robust Vondrak filtering method in extracting internal solitary waves

ZHANG Jiali1, ZHANG Anmin1, SUN Chaohui2, ZHANG Xuefeng1, ZHANG Liang*1   

  1. 1. School of Marine Science and Technology, Tianjin University, Tianjin 300072, China;
    2. Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  • Received:2019-05-15 Online:2020-03-15 Published:2022-11-14

Abstract: Acoustic Doppler Current Profiler (ADCP) is an effective way to monitor ocean internal waves. However, due to the influence of the instrument itself and complex ocean environment noise, there are a lot of noise and some abnormal velocity values in the velocity data recorded by ADCP. In order to further improve the extraction accuracy of internal solitary waves in the sea, the weight function factor of IGG3 method was introduced according to the characteristics of the shipboard ADCP velocity data, and the Robust Vondrak filter was designed. In order to verify the effectiveness and superiority of Robust Vondrak filtering method, it was compared with three traditional filtering methods: fast Fourier transform, wavelet transform and sliding average. The experimental results show that the Robust Vondrak filtering method can not only remove the flow velocity noise, but also effectively eliminate abnormal flow velocity values, so it has certain advantages compared with the traditional filtering methods. The Robust Vondrak filtering method can extract internal solitary waves accurately and the horizontal velocity of each layer is clear. It is a good method to extract internal solitary wave.

Key words: Robust Vondrak filter, internal solitary wave, IGG3, ADCP

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