Mapping seabed features from multibeam echosounder data using autocorrelation and multi-scale wavelet analyses

pp. 253-260, vol. 13, 2010

Jarosław Tęgowski
Maritime Institute in Gdańsk, Gdańsk, Poland

Jarosław Nowak
Maritime Institute in Gdańsk, Gdańsk, Poland

Benedykt Hac
Maritime Institute in Gdańsk, Gdańsk, Poland

Mateusz Zamaryka
Institute of Oceanography, University of Gdansk, Gdynia, Poland

Kazimierz Szefler
Maritime Institute in Gdańsk, Gdańsk, Poland

Key words: bathymetry; Baltic Sea; wavelet decomposition

Abstract: In the paper we propose the method of seabed morphological features extraction, which we have obtained from bathymetric and backscatter data, recorded by multibeam echosounder. Presented results of acoustical recognition of the southern Baltic Sea bottom are the part of measurements conducted in the band of 220 km length in the central part of Polish coastal water. The detailed analysis of seabed features were performed for area located in the vicinity of Kołobrzeg harbour. The degree of seafloor corrugation was determined by autocorrelation analysis of seafloor bathymetry. To which, we used estimation of autocorrelation length and fractal dimension, based on the shape of autocorrelation function. Moreover, the parameters of wavelet decomposition of bottom backscattering strength were the input to fuzzy logic clustering system allowing for outline of seafloor areas of similar morphological features. Both presented methods have confirmed its effectiveness in identifying morphological characteristics and types of the bottom surface.

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© Polish Acoustical Society - Gdansk Department, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported. (CC BY-NC-SA 3.0)